Annotation of loncom/xml/lonplot.pm, revision 1.162

1.1       matthew     1: # The LearningOnline Network with CAPA
                      2: # Dynamic plot
                      3: #
1.162   ! foxr        4: # $Id: lonplot.pm,v 1.161 2012/07/17 09:54:48 foxr Exp $
1.1       matthew     5: #
                      6: # Copyright Michigan State University Board of Trustees
                      7: #
                      8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      9: #
                     10: # LON-CAPA is free software; you can redistribute it and/or modify
                     11: # it under the terms of the GNU General Public License as published by
                     12: # the Free Software Foundation; either version 2 of the License, or
                     13: # (at your option) any later version.
                     14: #
                     15: # LON-CAPA is distributed in the hope that it will be useful,
                     16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: # GNU General Public License for more details.
                     19: #
                     20: # You should have received a copy of the GNU General Public License
                     21: # along with LON-CAPA; if not, write to the Free Software
                     22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     23: #
                     24: # /home/httpd/html/adm/gpl.txt
                     25: #
                     26: # http://www.lon-capa.org/
                     27: #
1.35      matthew    28: 
1.149     jms        29: 
                     30: 
                     31: 
1.1       matthew    32: package Apache::lonplot;
1.10      matthew    33: 
1.1       matthew    34: use strict;
1.89      matthew    35: use warnings FATAL=>'all';
                     36: no warnings 'uninitialized';
1.10      matthew    37: use Apache::File;
1.1       matthew    38: use Apache::response;
1.2       matthew    39: use Apache::lonxml;
1.20      matthew    40: use Apache::edit;
1.106     albertel   41: use Apache::lonnet;
1.113     www        42: use LONCAPA;
                     43:  
1.10      matthew    44: 
1.129     albertel   45: use vars qw/$weboutputformat $version/;
1.97      matthew    46: 
1.109     foxr       47: 
1.108     foxr       48: 
1.33      harris41   49: BEGIN {
1.97      matthew    50:     &Apache::lonxml::register('Apache::lonplot',('gnuplot'));
                     51:     #
                     52:     # Determine the version of GNUPLOT
                     53:     $weboutputformat = 'gif';
1.129     albertel   54:     my $versionstring = `gnuplot --version 2>/dev/null`;
                     55:     ($version) = ($versionstring =~ /^gnuplot ([\d.]+)/);
                     56:     if ($version >= 4) {
1.97      matthew    57:         $weboutputformat = 'png';
                     58:     }
1.108     foxr       59:     
                     60: }
                     61: 
1.1       matthew    62: 
1.149     jms        63: =pod
                     64: 
1.10      matthew    65: ## 
                     66: ## Description of data structures:
                     67: ##
                     68: ##  %plot       %key    %axis
                     69: ## --------------------------
                     70: ##  height      title   color
                     71: ##  width       box     xmin
                     72: ##  bgcolor     pos     xmax
                     73: ##  fgcolor             ymin
                     74: ##  transparent         ymax
                     75: ##  grid
                     76: ##  border
                     77: ##  font
1.19      matthew    78: ##  align
1.10      matthew    79: ##
                     80: ##  @labels: $labels[$i] = \%label
                     81: ##           %label: text, xpos, ypos, justify
1.14      matthew    82: ##
1.10      matthew    83: ##  @curves: $curves[$i] = \%curve
1.14      matthew    84: ##           %curve: name, linestyle, ( function | data )
1.10      matthew    85: ##
                     86: ##  $curves[$i]->{'data'} = [ [x1,x2,x3,x4],
                     87: ##                            [y1,y2,y3,y4] ]
                     88: ##
1.21      matthew    89: 
                     90: ###################################################################
                     91: ##                                                               ##
                     92: ##        Tests used in checking the validitity of input         ##
                     93: ##                                                               ##
                     94: ###################################################################
1.29      matthew    95: 
1.149     jms        96: =cut
                     97: 
1.32      matthew    98: my $max_str_len = 50;    # if a label, title, xlabel, or ylabel text
                     99:                          # is longer than this, it will be truncated.
                    100: 
1.157     foxr      101: my %linetypes =			# For png use these linetypes.
1.135     faziophi  102:     (
                    103:      solid          => 1,
                    104:      dashed         => 0
                    105:     );
1.157     foxr      106: my %ps_linetypes = 		# For ps the line types are different!
                    107:    (
                    108:     solid          => 0,
                    109:     dashed         => 7
                    110:    );
1.135     faziophi  111: 
1.29      matthew   112: my %linestyles = 
                    113:     (
                    114:      lines          => 2,     # Maybe this will be used in the future
                    115:      linespoints    => 2,     # to check on whether or not they have 
                    116:      dots	    => 2,     # supplied enough <data></data> fields
                    117:      points         => 2,     # to use the given line style.  But for
                    118:      steps	    => 2,     # now there are more important things 
                    119:      fsteps	    => 2,     # for me to deal with.
                    120:      histeps        => 2,
1.34      matthew   121:      errorbars	    => 3,
                    122:      xerrorbars	    => [3,4],
                    123:      yerrorbars	    => [3,4],
1.35      matthew   124:      xyerrorbars    => [4,6],
1.34      matthew   125:      boxes          => 3,
1.110     albertel  126:      filledcurves   => 2,
1.35      matthew   127:      vector	    => 4
1.29      matthew   128:     );		    
                    129: 
1.11      matthew   130: my $int_test       = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
1.19      matthew   131: my $real_test      = 
                    132:     sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d*\.?\d*([eE][+-]\d+)?$/};
1.62      matthew   133: my $pos_real_test  =
                    134:     sub {$_[0]=~s/\s+//g;$_[0]=~/^[+]?\d*\.?\d*([eE][+-]\d+)?$/};
1.79      matthew   135: my $color_test     = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-fA-F]{6}$/};
1.1       matthew   136: my $onoff_test     = sub {$_[0]=~/^(on|off)$/};
1.15      matthew   137: my $key_pos_test   = sub {$_[0]=~/^(top|bottom|right|left|outside|below| )+$/};
1.119     albertel  138: my $sml_test       = sub {$_[0]=~/^(\d+|small|medium|large)$/};
1.29      matthew   139: my $linestyle_test = sub {exists($linestyles{$_[0]})};
1.67      matthew   140: my $words_test     = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w~!\@\#\$\%^&\*\(\)-=_\+\[\]\{\}:\;\'<>,\.\/\?\\]+ ?)+$/};
1.21      matthew   141: 
1.160     foxr      142: my $arrowhead_test = sub{$_[0]=~/^(nohead|head|heads| )+$/};
                    143: my $arrowstyle_test= sub{$_[0]=~/^(filled|empty|nofilled)+$/};
                    144: my $degree_test  = sub{&$pos_real_test($_[0]) && ($_[0] <= 360.0)};
                    145: 
1.21      matthew   146: ###################################################################
                    147: ##                                                               ##
                    148: ##                      Attribute metadata                       ##
                    149: ##                                                               ##
                    150: ###################################################################
1.47      matthew   151: my @gnuplot_edit_order = 
1.123     albertel  152:     qw/alttag bgcolor fgcolor height width texwidth fontface font texfont
                    153:     transparent grid samples 
                    154:     border align plotcolor plottype gridtype lmargin rmargin
1.115     albertel  155:     tmargin bmargin major_ticscale minor_ticscale boxwidth gridlayer fillstyle
1.110     albertel  156:     pattern solid/;
1.101     matthew   157: 
1.105     matthew   158: my $margin_choices = ['default',0..20];
1.48      matthew   159: 
1.47      matthew   160: my %gnuplot_defaults = 
1.1       matthew   161:     (
1.64      matthew   162:      alttag       => {
                    163: 	 default     => 'dynamically generated plot',
                    164: 	 test        => $words_test,
1.120     albertel  165: 	 description => 'Brief description of the plot',
1.64      matthew   166:       	 edit_type   => 'entry',
                    167: 	 size        => '40'
                    168: 	 },
1.20      matthew   169:      height       => {
1.65      matthew   170: 	 default     => 300,
1.20      matthew   171: 	 test        => $int_test,
1.120     albertel  172: 	 description => 'Height of image (pixels)',
1.38      matthew   173:       	 edit_type   => 'entry',
                    174: 	 size        => '10'
1.20      matthew   175: 	 },
                    176:      width        => {
1.65      matthew   177: 	 default     => 400,
1.20      matthew   178: 	 test        => $int_test,
1.120     albertel  179: 	 description => 'Width of image (pixels)',
1.38      matthew   180: 	 edit_type   => 'entry',
                    181: 	 size        => '10'
1.20      matthew   182: 	 },
                    183:      bgcolor      => {
                    184: 	 default     => 'xffffff',
                    185: 	 test        => $color_test, 
1.120     albertel  186: 	 description => 'Background color of image (xffffff)',
1.38      matthew   187: 	 edit_type   => 'entry',
1.154     foxr      188: 	 size        => '10',
                    189:          class       => 'colorchooser'
1.20      matthew   190: 	 },
                    191:      fgcolor      => {
                    192: 	 default     => 'x000000',
                    193: 	 test        => $color_test,
1.120     albertel  194: 	 description => 'Foreground color of image (x000000)',
1.38      matthew   195: 	 edit_type   => 'entry',
1.154     foxr      196: 	 size        => '10',
                    197:          class       => 'colorchooser'
1.20      matthew   198: 	 },
                    199:      transparent  => {
                    200: 	 default     => 'off',
                    201: 	 test        => $onoff_test, 
1.34      matthew   202: 	 description => 'Transparent image',
1.45      matthew   203: 	 edit_type   => 'onoff'
1.20      matthew   204: 	 },
                    205:      grid         => {
1.65      matthew   206: 	 default     => 'on',
1.20      matthew   207: 	 test        => $onoff_test, 
1.34      matthew   208: 	 description => 'Display grid',
1.45      matthew   209: 	 edit_type   => 'onoff'
1.20      matthew   210: 	 },
1.110     albertel  211:      gridlayer    => {
                    212: 	 default     => 'off',
                    213: 	 test        => $onoff_test, 
                    214: 	 description => 'Display grid front layer over filled boxes or filled curves',
                    215: 	 edit_type   => 'onoff'
                    216: 	 },
                    217:      box_border   => {
                    218: 	 default     => 'noborder',
                    219: 	 test        => sub {$_[0]=~/^(noborder|border)$/},
                    220: 	 description => 'Draw border for boxes',
                    221: 	 edit_type   => 'choice',
                    222: 	 choices     => ['border','noborder']
                    223: 	 },
1.20      matthew   224:      border       => {
                    225: 	 default     => 'on',
                    226: 	 test        => $onoff_test, 
1.34      matthew   227: 	 description => 'Draw border around plot',
1.45      matthew   228: 	 edit_type   => 'onoff'
1.20      matthew   229: 	 },
                    230:      font         => {
1.119     albertel  231: 	 default     => '9',
1.20      matthew   232: 	 test        => $sml_test,
1.125     albertel  233: 	 description => 'Font size to use in web output (pts)',
1.20      matthew   234: 	 edit_type   => 'choice',
1.126     albertel  235: 	 choices     => [['5','5 (small)'],'6','7','8',['9','9 (medium)'],'10',['11','11 (large)'],'12','15']
1.20      matthew   236: 	 },
1.120     albertel  237:      fontface     => {
                    238:         default     => 'sans-serif',
                    239:         test        => sub {$_[0]=~/^(sans-serif|serif|classic)$/},
                    240:         description => 'Type of font to use',
                    241:         edit_type   => 'choice',
                    242:         choices     => ['sans-serif','serif', 'classic']
                    243:         },
1.110     albertel  244:      samples      => {
1.77      matthew   245: 	 default     => '100',
                    246: 	 test        => $int_test,
                    247: 	 description => 'Number of samples for non-data plots',
                    248: 	 edit_type   => 'choice',
                    249: 	 choices     => ['100','200','500','1000','2000','5000']
                    250: 	 },
1.20      matthew   251:      align        => {
1.116     albertel  252: 	 default     => 'middle',
                    253: 	 test        => sub {$_[0]=~/^(left|right|middle|center)$/},
1.120     albertel  254: 	 description => 'Alignment for image in HTML',
1.20      matthew   255: 	 edit_type   => 'choice',
1.116     albertel  256: 	 choices     => ['left','right','middle']
1.82      matthew   257: 	 },
                    258:      texwidth     => {
                    259:          default     => '93',
                    260:          test        => $int_test,
                    261:          description => 'Width of plot when printed (mm)',
                    262:          edit_type   => 'entry',
                    263:          size        => '5'
                    264:          },
1.110     albertel  265:      texfont      => {
1.92      matthew   266:          default     => '22',
                    267:          test        => $int_test,
                    268:          description => 'Font size to use in TeX output (pts):',
                    269:          edit_type   => 'choice',
1.96      matthew   270:          choices     => [qw/8 10 12 14 16 18 20 22 24 26 28 30 32 34 36/],
1.92      matthew   271:          },
1.110     albertel  272:      plotcolor    => {
1.105     matthew   273:          default     => 'monochrome',
                    274:          test        => sub {$_[0]=~/^(monochrome|color|colour)$/},
                    275:          description => 'Color setting for printing:',
                    276:          edit_type   => 'choice',
                    277:          choices     => [qw/monochrome color colour/],
                    278:          },
1.110     albertel  279:      pattern      => {
                    280: 	 default     => '',
                    281: 	 test        => $int_test,
1.120     albertel  282: 	 description => 'Pattern value for boxes:',
1.110     albertel  283: 	 edit_type   => 'choice',
                    284:          choices     => [0,1,2,3,4,5,6]
                    285:          },
                    286:      solid        => {
                    287:          default     => 0,
                    288:          test        => $real_test,
                    289:          description => 'The density of fill style for boxes',
                    290:          edit_type   => 'entry',
                    291:          size        => '5'
                    292:          },
                    293:      fillstyle    => {
                    294: 	 default     => 'empty',
                    295: 	 test        => sub {$_[0]=~/^(empty|solid|pattern)$/},
                    296: 	 description => 'Filled style for boxes:',
                    297: 	 edit_type   => 'choice',
                    298:          choices     => ['empty','solid','pattern']
                    299:          },
                    300:      plottype     => {
1.87      matthew   301: 	 default     => 'Cartesian',
                    302: 	 test        => sub {$_[0]=~/^(Polar|Cartesian)$/},
                    303: 	 description => 'Plot type:',
                    304: 	 edit_type   => 'choice',
1.94      matthew   305:          choices     => ['Cartesian','Polar']
1.87      matthew   306:          },
1.115     albertel  307:      gridtype     => {
                    308: 	 default     => 'Cartesian',
1.118     albertel  309: 	 test        => sub {$_[0]=~/^(Polar|Cartesian|Linear-Log|Log-Linear|Log-Log)$/},
1.115     albertel  310: 	 description => 'Grid type:',
                    311: 	 edit_type   => 'choice',
1.118     albertel  312:          choices     => ['Cartesian','Polar','Linear-Log','Log-Linear','Log-Log']
1.115     albertel  313:          },
1.110     albertel  314:      lmargin      => {
1.101     matthew   315: 	 default     => 'default',
                    316: 	 test        => sub {$_[0]=~/^(default|\d+)$/},
                    317: 	 description => 'Left margin width (pts):',
                    318: 	 edit_type   => 'choice',
                    319:          choices     => $margin_choices,
                    320:          },
1.110     albertel  321:      rmargin      => {
1.101     matthew   322: 	 default     => 'default',
                    323: 	 test        => sub {$_[0]=~/^(default|\d+)$/},
                    324: 	 description => 'Right margin width (pts):',
                    325: 	 edit_type   => 'choice',
                    326:          choices     => $margin_choices,
                    327:          },
1.110     albertel  328:      tmargin      => {
1.101     matthew   329: 	 default     => 'default',
                    330: 	 test        => sub {$_[0]=~/^(default|\d+)$/},
                    331: 	 description => 'Top margin width (pts):',
                    332: 	 edit_type   => 'choice',
                    333:          choices     => $margin_choices,
                    334:          },
1.110     albertel  335:      bmargin      => {
1.101     matthew   336: 	 default     => 'default',
                    337: 	 test        => sub {$_[0]=~/^(default|\d+)$/},
1.104     www       338: 	 description => 'Bottom margin width (pts):',
1.101     matthew   339: 	 edit_type   => 'choice',
                    340:          choices     => $margin_choices,
                    341:          },
1.110     albertel  342:      boxwidth     => {
                    343: 	 default     => '',
                    344: 	 test        => $real_test, 
1.120     albertel  345: 	 description => 'Width of boxes, default is auto',
1.110     albertel  346: 	 edit_type   => 'entry',
                    347:          size        => '5'
                    348:          },
1.101     matthew   349:      major_ticscale  => {
                    350:          default     => '1',
                    351:          test        => $real_test,
                    352:          description => 'Size of major tic marks (plot coordinates)',
                    353:          edit_type   => 'entry',
                    354:          size        => '5'
                    355:          },
                    356:      minor_ticscale  => {
                    357:          default     => '0.5',
                    358:          test        => $real_test,
                    359:          description => 'Size of minor tic mark (plot coordinates)',
                    360:          edit_type   => 'entry',
                    361:          size        => '5'
                    362:          },
1.1       matthew   363:      );
                    364: 
                    365: my %key_defaults = 
                    366:     (
1.20      matthew   367:      title => { 
                    368: 	 default => '',
                    369: 	 test => $words_test,
                    370: 	 description => 'Title of key',
1.38      matthew   371: 	 edit_type   => 'entry',
                    372: 	 size        => '40'
1.20      matthew   373: 	 },
                    374:      box   => { 
                    375: 	 default => 'off',
                    376: 	 test => $onoff_test,
                    377: 	 description => 'Draw a box around the key?',
1.45      matthew   378: 	 edit_type   => 'onoff'
1.20      matthew   379: 	 },
                    380:      pos   => { 
                    381: 	 default => 'top right', 
                    382: 	 test => $key_pos_test, 
1.120     albertel  383: 	 description => 'Position of the key on the plot',
1.20      matthew   384: 	 edit_type   => 'choice',
                    385: 	 choices     => ['top left','top right','bottom left','bottom right',
                    386: 			 'outside','below']
                    387: 	 }
1.1       matthew   388:      );
                    389: 
                    390: my %label_defaults = 
                    391:     (
1.20      matthew   392:      xpos    => {
                    393: 	 default => 0,
                    394: 	 test => $real_test,
1.120     albertel  395: 	 description => 'X position of label (graph coordinates)',
1.38      matthew   396: 	 edit_type   => 'entry',
                    397: 	 size        => '10'
1.20      matthew   398: 	 },
                    399:      ypos    => {
                    400: 	 default => 0, 
                    401: 	 test => $real_test,
1.120     albertel  402: 	 description => 'Y position of label (graph coordinates)',
1.38      matthew   403: 	 edit_type   => 'entry',
                    404: 	 size        => '10'
1.20      matthew   405: 	 },
                    406:      justify => {
                    407: 	 default => 'left',    
                    408: 	 test => sub {$_[0]=~/^(left|right|center)$/},
                    409: 	 description => 'justification of the label text on the plot',
                    410: 	 edit_type   => 'choice',
                    411: 	 choices     => ['left','right','center']
1.134     raeburn   412:      },
                    413:      rotate => {
                    414:          default => 0,
                    415:          test => $real_test,
                    416:          description => 'Rotation of label (degrees)',
                    417:          edit_type   => 'entry',
                    418:          size        => '10',
1.20      matthew   419:      }
1.1       matthew   420:      );
                    421: 
1.89      matthew   422: my @tic_edit_order = ('location','mirror','start','increment','end',
                    423:                       'minorfreq');
1.45      matthew   424: my %tic_defaults =
                    425:     (
                    426:      location => {
                    427: 	 default => 'border', 
                    428: 	 test => sub {$_[0]=~/^(border|axis)$/},
1.90      matthew   429: 	 description => 'Location of major tic marks',
1.45      matthew   430: 	 edit_type   => 'choice',
                    431: 	 choices     => ['border','axis']
                    432: 	 },
                    433:      mirror => {
                    434: 	 default => 'on', 
                    435: 	 test => $onoff_test,
1.120     albertel  436: 	 description => 'Mirror tics on opposite axis?',
1.45      matthew   437: 	 edit_type   => 'onoff'
                    438: 	 },
                    439:      start => {
                    440: 	 default => '-10.0',
                    441: 	 test => $real_test,
1.90      matthew   442: 	 description => 'Start major tics at',
1.45      matthew   443: 	 edit_type   => 'entry',
                    444: 	 size        => '10'
                    445: 	 },
                    446:      increment => {
                    447: 	 default => '1.0',
                    448: 	 test => $real_test,
1.90      matthew   449: 	 description => 'Place a major tic every',
1.45      matthew   450: 	 edit_type   => 'entry',
                    451: 	 size        => '10'
                    452: 	 },
                    453:      end => {
                    454: 	 default => ' 10.0',
                    455: 	 test => $real_test,
1.90      matthew   456: 	 description => 'Stop major tics at ',
1.45      matthew   457: 	 edit_type   => 'entry',
                    458: 	 size        => '10'
                    459: 	 },
1.89      matthew   460:      minorfreq => {
                    461: 	 default => '0',
                    462: 	 test => $int_test,
1.98      matthew   463: 	 description => 'Number of minor tics per major tic mark',
1.89      matthew   464: 	 edit_type   => 'entry',
                    465: 	 size        => '10'
                    466: 	 },         
1.45      matthew   467:      );
                    468: 
1.152     faziophi  469: my @axis_edit_order = ('color','xmin','xmax','ymin','ymax','xformat', 'yformat', 'xzero', 'yzero');
1.1       matthew   470: my %axis_defaults = 
                    471:     (
1.28      matthew   472:      color   => {
1.20      matthew   473: 	 default => 'x000000', 
                    474: 	 test => $color_test,
1.120     albertel  475: 	 description => 'Color of grid lines (x000000)',
1.38      matthew   476: 	 edit_type   => 'entry',
1.154     foxr      477: 	 size        => '10',
                    478:          class       => 'colorchooser'
1.20      matthew   479: 	 },
                    480:      xmin      => {
                    481: 	 default => '-10.0',
                    482: 	 test => $real_test,
1.120     albertel  483: 	 description => 'Minimum x-value shown in plot',
1.38      matthew   484: 	 edit_type   => 'entry',
                    485: 	 size        => '10'
1.20      matthew   486: 	 },
                    487:      xmax      => {
                    488: 	 default => ' 10.0',
                    489: 	 test => $real_test,
1.120     albertel  490: 	 description => 'Maximum x-value shown in plot',	 
1.38      matthew   491: 	 edit_type   => 'entry',
                    492: 	 size        => '10'
1.20      matthew   493: 	 },
                    494:      ymin      => {
                    495: 	 default => '-10.0',
                    496: 	 test => $real_test,
1.120     albertel  497: 	 description => 'Minimum y-value shown in plot',	 
1.38      matthew   498: 	 edit_type   => 'entry',
                    499: 	 size        => '10'
1.20      matthew   500: 	 },
                    501:      ymax      => {
                    502: 	 default => ' 10.0',
                    503: 	 test => $real_test,
1.120     albertel  504: 	 description => 'Maximum y-value shown in plot',	 
1.38      matthew   505: 	 edit_type   => 'entry',
                    506: 	 size        => '10'
1.132     albertel  507:         },
                    508:      xformat      => {
                    509:          default     => 'on',
                    510:          test        => sub {$_[0]=~/^(on|off|\d+(f|F|e|E))$/},
                    511:          description => 'X-axis number formatting',
                    512:          edit_type   => 'choice',
                    513:          choices     => ['on', 'off', '2e', '2f'],
                    514:          },
                    515:      yformat      => {
                    516:          default     => 'on',
                    517:          test        => sub {$_[0]=~/^(on|off|\d+(f|F|e|E))$/},
1.151     raeburn   518:          description => 'Y-axis number formatting',
1.132     albertel  519:          edit_type   => 'choice',
                    520:          choices     => ['on', 'off', '2e', '2f'],
                    521:          },
1.152     faziophi  522:      
                    523:      xzero => {
                    524:      	default => 'off',
                    525:      	test	=> sub {$_[0]=~/^(off|line|thick-line|dotted)$/},
                    526:      	description => 'Show x-zero (y=0) axis',
                    527:      	edit_type  => 'choice',
                    528:      	choices	=> ['off', 'line', 'thick-line', 'dotted'],
                    529:      	},
                    530:      
                    531:      yzero => {
                    532:      	default => 'off',
                    533:      	test	=> sub {$_[0]=~/^(off|line|thick-line|dotted)$/},
                    534:      	description => 'Show y-zero (x=0) axis',
                    535:      	edit_type  => 'choice',
                    536:      	choices	=> ['off', 'line', 'thick-line', 'dotted'],
                    537:      	},
1.1       matthew   538:      );
                    539: 
1.160     foxr      540: my @curve_edit_order = ('color','name','linestyle','linewidth','linetype',
                    541: 			'pointtype','pointsize','limit', 'arrowhead', 'arrowstyle', 
                    542: 			'arrowlength', 'arrowangle', 'arrowbackangle'
                    543:     );
1.60      matthew   544: 
1.1       matthew   545: my %curve_defaults = 
                    546:     (
1.20      matthew   547:      color     => {
                    548: 	 default => 'x000000',
                    549: 	 test => $color_test,
1.120     albertel  550: 	 description => 'Color of curve (x000000)',
1.38      matthew   551: 	 edit_type   => 'entry',
1.154     foxr      552: 	 size        => '10',
                    553: 	 class       => 'colorchooser'
1.20      matthew   554: 	 },
                    555:      name      => {
                    556: 	 default => '',
                    557: 	 test => $words_test,
1.120     albertel  558: 	 description => 'Name of curve to appear in key',
1.38      matthew   559: 	 edit_type   => 'entry',
                    560: 	 size        => '20'
1.20      matthew   561: 	 },
                    562:      linestyle => {
                    563: 	 default => 'lines',
                    564: 	 test => $linestyle_test,
1.135     faziophi  565: 	 description => 'Plot with:',
1.20      matthew   566: 	 edit_type   => 'choice',
1.38      matthew   567: 	 choices     => [keys(%linestyles)]
1.60      matthew   568: 	 },
1.119     albertel  569:      linewidth => {
1.130     albertel  570:          default     => 1,
1.119     albertel  571:          test        => $int_test,
1.135     faziophi  572:          description => 'Line width (may not apply to all plot styles)',
1.119     albertel  573:          edit_type   => 'choice',
                    574:          choices     => [1,2,3,4,5,6,7,8,9,10]
                    575:          },
1.135     faziophi  576:      linetype => {
                    577:          default     => 'solid',
                    578:          test        => sub {$_[0]=~/^(solid|dashed)$/},
                    579:          description => 'Line type (may not apply to all plot styles)',
                    580:          edit_type   => 'choice',
                    581:          choices     => ['solid', 'dashed']
                    582:          }, 
1.60      matthew   583:      pointsize => {
                    584:          default     => 1,
1.62      matthew   585:          test        => $pos_real_test,
1.135     faziophi  586:          description => 'Point size (may not apply to all plot styles)',
1.62      matthew   587:          edit_type   => 'entry',
                    588:          size        => '5'
                    589:          },
                    590:      pointtype => {
                    591:          default     => 1,
1.60      matthew   592:          test        => $int_test,
1.135     faziophi  593:          description => 'Point type (may not apply to all plot styles)',
1.60      matthew   594:          edit_type   => 'choice',
1.62      matthew   595:          choices     => [0,1,2,3,4,5,6]
1.110     albertel  596:          },
                    597:      limit     => {
                    598:          default     => 'closed',
1.135     faziophi  599: 	 test        => sub {$_[0]=~/^(above|below|closed|x1|x2|y1|y2)$/},
1.120     albertel  600:          description => 'Point to fill -- for filledcurves',
1.110     albertel  601:          edit_type   => 'choice',
1.135     faziophi  602:          choices     => ['above', 'below', 'closed','x1','x2','y1','y2']
1.110     albertel  603:          },
1.160     foxr      604:      arrowhead => {
                    605:          default     => 'head',
                    606: 	 test        => $arrowhead_test,
                    607: 	 description => 'Vector arrow head type',
                    608: 	 edit_type   => 'choice',
                    609: 	 choices     => ['nohead', 'head', 'heads']
                    610:      },
                    611:      arrowstyle => {
                    612: 	 default     => 'filled',
                    613: 	 test        => $arrowstyle_test,
                    614: 	 description => 'Vector arrow head style',
                    615: 	 edit_type   => 'choice',
                    616: 	 choices     => ['filled', 'empty', 'nofilled']
                    617:      },
                    618:      arrowlength => {
                    619: 	 default     => 0.02,
                    620: 	 test        => $pos_real_test,
                    621: 	 description => "Length of vector arrow (only applies to vector plots)",
                    622: 	 edit_type   => 'entry',
                    623: 	 size        => '5'
                    624:      },
                    625:      arrowangle  => {
                    626: 	default      => 10.0,
                    627: 	test         => $degree_test,
                    628: 	description  => 'Angle of arrow branches to arrow body (only applies to vector plots)',
                    629: 	edit_type    => 'entry',
                    630: 	size         => '5'
                    631:      },
                    632: 
                    633:      arrowbackangle => {
                    634: 	 default    => 90.0,
                    635: 	 test       => $degree_test,
                    636: 	 descripton => 'Angle of arrow back lines to branches.',
                    637: 	 edit_type  => 'entry',
                    638: 	 size       => '5'
                    639:      }
                    640: 
1.1       matthew   641:      );
                    642: 
1.21      matthew   643: ###################################################################
                    644: ##                                                               ##
                    645: ##                    parsing and edit rendering                 ##
                    646: ##                                                               ##
                    647: ###################################################################
1.107     foxr      648: 
                    649: undef %Apache::lonplot::plot;
                    650: my (%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
1.1       matthew   651: 
1.47      matthew   652: sub start_gnuplot {
1.107     foxr      653:     undef(%Apache::lonplot::plot);   undef(%key);    undef(%axis);
1.89      matthew   654:     undef($title);  undef($xlabel); undef($ylabel);
                    655:     undef(@labels); undef(@curves);
                    656:     undef(%xtics);  undef(%ytics);
1.6       matthew   657:     #
1.1       matthew   658:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    659:     my $result='';
1.25      matthew   660:     &Apache::lonxml::register('Apache::lonplot',
1.45      matthew   661: 	     ('title','xlabel','ylabel','key','axis','label','curve',
                    662: 	      'xtics','ytics'));
1.29      matthew   663:     push (@Apache::lonxml::namespace,'lonplot');
1.51      matthew   664:     if ($target eq 'web' || $target eq 'tex') {
1.107     foxr      665: 	&get_attributes(\%Apache::lonplot::plot,\%gnuplot_defaults,$parstack,$safeeval,
1.17      matthew   666: 			$tagstack->[-1]);
1.20      matthew   667:     } elsif ($target eq 'edit') {
1.47      matthew   668: 	$result .= &Apache::edit::tag_start($target,$token,'GnuPlot');
                    669: 	$result .= &edit_attributes($target,$token,\%gnuplot_defaults,
1.116     albertel  670: 				    \@gnuplot_edit_order)
                    671: 	    .&Apache::edit::end_row()
                    672: 	    .&Apache::edit::start_spanning_row();
1.20      matthew   673:     } elsif ($target eq 'modified') {
                    674: 	my $constructtag=&Apache::edit::get_new_args
1.47      matthew   675: 	    ($token,$parstack,$safeeval,keys(%gnuplot_defaults));
1.155     foxr      676: 
1.20      matthew   677: 	if ($constructtag) {
1.155     foxr      678: 	    #
                    679: 	    # The color chooser does not prepent x to the color values
                    680: 	    # Do that here:
                    681: 	    #
                    682: 	    foreach my $attribute ('bgcolor', 'fgcolor') {
                    683: 		my $value = $token->[2]{$attribute};
                    684: 		if (defined $value && !($value =~ /^x/)) {
                    685: 		    $token->[2]{$attribute} = 'x' . $value;
                    686: 		}
                    687: 	    }
1.20      matthew   688: 	    $result = &Apache::edit::rebuild_tag($token);
                    689: 	}
1.4       matthew   690:     }
1.21      matthew   691:     return $result;
1.1       matthew   692: }
                    693: 
1.47      matthew   694: sub end_gnuplot {
1.1       matthew   695:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    696:     pop @Apache::lonxml::namespace;
1.4       matthew   697:     &Apache::lonxml::deregister('Apache::lonplot',
                    698: 	('title','xlabel','ylabel','key','axis','label','curve'));
                    699:     my $result = '';
1.56      albertel  700:     my $randnumber;
1.153     foxr      701:     my $tmpdir =LONCAPA::tempdir(); # Where temporary files live:
                    702: 
1.56      albertel  703:     # need to call rand everytime start_script would evaluate, as the
                    704:     # safe space rand number generator and the global rand generator 
1.95      www       705:     # are not separate
1.56      albertel  706:     if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
                    707: 	$target eq 'answer') {
                    708:       $randnumber=int(rand(1000));
                    709:     }
1.51      matthew   710:     if ($target eq 'web' || $target eq 'tex') {
1.21      matthew   711: 	&check_inputs(); # Make sure we have all the data we need
1.13      matthew   712: 	##
                    713: 	## Determine filename
1.106     albertel  714: 	my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
1.69      matthew   715: 	    '_'.time.'_'.$$.$randnumber.'_plot';
1.4       matthew   716: 	## Write the plot description to the file
1.51      matthew   717: 	&write_gnuplot_file($tmpdir,$filename,$target);
1.113     www       718: 	$filename = &escape($filename);
1.4       matthew   719: 	## return image tag for the plot
1.51      matthew   720: 	if ($target eq 'web') {
                    721: 	    $result .= <<"ENDIMAGE";
1.114     albertel  722: <img src    = "/cgi-bin/plot.$weboutputformat?file=$filename.data" 
1.107     foxr      723:      width  = "$Apache::lonplot::plot{'width'}"
                    724:      height = "$Apache::lonplot::plot{'height'}"
                    725:      align  = "$Apache::lonplot::plot{'align'}"
                    726:      alt    = "$Apache::lonplot::plot{'alttag'}" />
1.12      matthew   727: ENDIMAGE
1.51      matthew   728:         } elsif ($target eq 'tex') {
1.107     foxr      729: 	    &Apache::lonxml::debug(" gnuplot wid = $Apache::lonplot::plot{'width'}");
                    730: 	    &Apache::lonxml::debug(" gnuplot ht  = $Apache::lonplot::plot{'height'}");
1.91      albertel  731: 	    #might be inside the safe space, register the URL for later
                    732: 	    &Apache::lonxml::register_ssi("/cgi-bin/plot.gif?file=$filename.data&output=eps");
1.111     albertel  733: 	    $result  = "%DYNAMICIMAGE:$Apache::lonplot::plot{'width'}:$Apache::lonplot::plot{'height'}:$Apache::lonplot::plot{'texwidth'}\n";
1.153     foxr      734: 	    $result .= '\graphicspath{{'.$tmpdir.'}}'."\n";
1.113     www       735: 	    $result .= '\includegraphics[width='.$Apache::lonplot::plot{'texwidth'}.' mm]{'.&unescape($filename).'.eps}';
1.51      matthew   736: 	}
1.20      matthew   737:     } elsif ($target eq 'edit') {
1.21      matthew   738: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   739:     }
1.1       matthew   740:     return $result;
                    741: }
1.2       matthew   742: 
1.45      matthew   743: 
                    744: ##--------------------------------------------------------------- xtics
                    745: sub start_xtics {
                    746:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    747:     my $result='';
1.51      matthew   748:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   749: 	&get_attributes(\%xtics,\%tic_defaults,$parstack,$safeeval,
                    750: 		    $tagstack->[-1]);
                    751:     } elsif ($target eq 'edit') {
                    752: 	$result .= &Apache::edit::tag_start($target,$token,'xtics');
                    753: 	$result .= &edit_attributes($target,$token,\%tic_defaults,
                    754: 				    \@tic_edit_order);
                    755:     } elsif ($target eq 'modified') {
                    756: 	my $constructtag=&Apache::edit::get_new_args
                    757: 	    ($token,$parstack,$safeeval,keys(%tic_defaults));
                    758: 	if ($constructtag) {
                    759: 	    $result = &Apache::edit::rebuild_tag($token);
                    760: 	}
                    761:     }
                    762:     return $result;
                    763: }
                    764: 
                    765: sub end_xtics {
                    766:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    767:     my $result = '';
1.51      matthew   768:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   769:     } elsif ($target eq 'edit') {
                    770: 	$result.=&Apache::edit::tag_end($target,$token);
                    771:     }
                    772:     return $result;
                    773: }
                    774: 
                    775: ##--------------------------------------------------------------- ytics
                    776: sub start_ytics {
                    777:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    778:     my $result='';
1.51      matthew   779:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   780: 	&get_attributes(\%ytics,\%tic_defaults,$parstack,$safeeval,
                    781: 		    $tagstack->[-1]);
                    782:     } elsif ($target eq 'edit') {
                    783: 	$result .= &Apache::edit::tag_start($target,$token,'ytics');
                    784: 	$result .= &edit_attributes($target,$token,\%tic_defaults,
                    785: 				    \@tic_edit_order);
                    786:     } elsif ($target eq 'modified') {
                    787: 	my $constructtag=&Apache::edit::get_new_args
                    788: 	    ($token,$parstack,$safeeval,keys(%tic_defaults));
                    789: 	if ($constructtag) {
                    790: 	    $result = &Apache::edit::rebuild_tag($token);
                    791: 	}
                    792:     }
                    793:     return $result;
                    794: }
                    795: 
                    796: sub end_ytics {
                    797:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    798:     my $result = '';
1.51      matthew   799:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   800:     } elsif ($target eq 'edit') {
                    801: 	$result.=&Apache::edit::tag_end($target,$token);
                    802:     }
                    803:     return $result;
                    804: }
                    805: 
1.119     albertel  806: ##-----------------------------------------------------------------font
1.120     albertel  807: my %font_properties =
                    808:     (
                    809:      'classic'    => {
                    810: 	 face       => 'classic',
                    811: 	 file       => 'DejaVuSansMono-Bold',
                    812: 	 printname  => 'Helvetica',
1.121     albertel  813: 	 tex_no_file => 1,
1.120     albertel  814:      },
                    815:      'sans-serif' => {
                    816: 	 face       => 'sans-serif',
                    817: 	 file       => 'DejaVuSans',
                    818: 	 printname  => 'DejaVuSans',
                    819:      },
                    820:      'serif'      => {
                    821: 	 face       => 'serif',
                    822: 	 file       => 'DejaVuSerif',
                    823: 	 printname  => 'DejaVuSerif',
                    824:      },
                    825:      );
                    826: 
1.119     albertel  827: sub get_font {
1.124     albertel  828:     my ($target) = @_;
1.120     albertel  829:     my ($size, $selected_font);
                    830: 
1.119     albertel  831:     if ( $Apache::lonplot::plot{'font'} =~ /^(small|medium|large)/) {
1.120     albertel  832: 	$selected_font = $font_properties{'classic'};
1.119     albertel  833: 	if ( $Apache::lonplot::plot{'font'} eq 'small') {
                    834: 	    $size = '5';
                    835: 	} elsif ( $Apache::lonplot::plot{'font'} eq 'medium') {
                    836: 	    $size = '9';
                    837: 	} elsif ( $Apache::lonplot::plot{'font'} eq 'large') {
1.126     albertel  838: 	    $size = '11';
1.119     albertel  839: 	} else {
                    840: 	    $size = '9';
                    841: 	}
                    842:     } else {
1.122     albertel  843: 	$size = $Apache::lonplot::plot{'font'};
1.120     albertel  844: 	$selected_font = $font_properties{$Apache::lonplot::plot{'fontface'}};
1.119     albertel  845:     }
1.124     albertel  846:     if ($target eq 'tex' && defined($Apache::lonplot::plot{'texfont'})) {
1.146     foxr      847: #	$selected_font = $font_properties{'classic'};
1.124     albertel  848: 	$size = $Apache::lonplot::plot{'texfont'};
                    849:     }
1.120     albertel  850:     return ($size, $selected_font);
1.119     albertel  851: }
1.45      matthew   852: 
1.1       matthew   853: ##----------------------------------------------------------------- key
                    854: sub start_key {
                    855:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    856:     my $result='';
1.51      matthew   857:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   858: 	&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
1.11      matthew   859: 		    $tagstack->[-1]);
1.20      matthew   860:     } elsif ($target eq 'edit') {
1.25      matthew   861: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Key');
1.21      matthew   862: 	$result .= &edit_attributes($target,$token,\%key_defaults);
1.20      matthew   863:     } elsif ($target eq 'modified') {
                    864: 	my $constructtag=&Apache::edit::get_new_args
1.24      matthew   865: 	    ($token,$parstack,$safeeval,keys(%key_defaults));
1.20      matthew   866: 	if ($constructtag) {
                    867: 	    $result = &Apache::edit::rebuild_tag($token);
                    868: 	}
1.4       matthew   869:     }
1.1       matthew   870:     return $result;
                    871: }
                    872: 
                    873: sub end_key {
                    874:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    875:     my $result = '';
1.51      matthew   876:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   877:     } elsif ($target eq 'edit') {
1.21      matthew   878: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   879:     }
1.1       matthew   880:     return $result;
                    881: }
1.21      matthew   882: 
1.128     albertel  883: sub parse_label {
                    884:     my ($target,$text) = @_;
                    885:     my $parser=HTML::LCParser->new(\$text);
                    886:     my $result;
                    887:     while (my $token=$parser->get_token) {
                    888: 	if ($token->[0] eq 'S') {
                    889: 	    if ($token->[1] eq 'sub') {
                    890: 		$result .= '_{';
                    891: 	    } elsif ($token->[1] eq 'sup') {
                    892: 		$result .= '^{';
                    893: 	    } else {
                    894: 		$result .= $token->[4];
                    895: 	    }
                    896: 	} elsif ($token->[0] eq 'E') {
                    897: 	    if ($token->[1] eq 'sub'
                    898: 		|| $token->[1] eq 'sup') {
                    899: 		$result .= '}';
                    900: 	    } else {
                    901: 		$result .= $token->[2];
                    902: 	    }
                    903: 	} elsif ($token->[0] eq 'T') {
                    904: 	    $result .= &replace_entities($target,$token->[1]);
                    905: 	}
                    906:     }
                    907:     return $result;
                    908: }
                    909: 
1.143     foxr      910: #
                    911: #  Note that there are severe restrictions on font selection in the
                    912: # ps driver now.  later in life Gnuplot is supposed to support
                    913: # utf-8 fonts in the posts script driver.  When this happens,
                    914: # the tex entries with comments that include the word <FIX>
                    915: # should be changed to print the correct glyphs rather than some
                    916: # approximation or fallback of what is intended.
1.128     albertel  917: 
                    918: my %lookup = 
1.137     foxr      919:    (  # Greek alphabet:
1.139     foxr      920:       
                    921:       '(Alpha|#913)'    => {'tex' => '{/Symbol A}', 'web' => "\x{391}"},
                    922:       '(Beta|#914)'    => {'tex' => '{/Symbol B}', 'web' => "\x{392}"},
                    923:       '(Chi|#935)'     => {'tex' => '{/Symbol C}', 'web' => "\x{3A7}"},
                    924:       '(Delta|#916)'   => {'tex' => '{/Symbol D}', 'web' => "\x{394}"},
                    925:       '(Epsilon|#917)' => {'tex' => '{/Symbol E}', 'web' => "\x{395}"},
                    926:       '(Phi|#934)'     => {'tex' => '{/Symbol F}', 'web' => "\x{3A6}"},
                    927:       '(Gamma|#915)'   => {'tex' => '{/Symbol G}', 'web' => "\x{393}"},
                    928:       '(Eta|#919)'     => {'tex' => '{/Symbol H}', 'web' => "\x{397}"},
                    929:       '(Iota|#921)'    => {'tex' => '{/Symbol I}', 'web' => "\x{399}"},
                    930:       '(Kappa|#922)'   => {'tex' => '{/Symbol K}', 'web' => "\x{39A}"},
                    931:       '(Lambda|#923)'  => {'tex' => '{/Symbol L}', 'web' => "\x{39B}"},
                    932:       '(Mu|#924)'      => {'tex' => '{/Symbol M}', 'web' => "\x{39C}"},
                    933:       '(Nu|#925)'      => {'tex' => '{/Symbol N}', 'web' => "\x{39D}"},
                    934:       '(Omicron|#927)' => {'tex' => '{/Symbol O}', 'web' => "\x{39F}"},
                    935:       '(Pi|#928)'      => {'tex' => '{/Symbol P}', 'web' => "\x{3A0}"},
                    936:       '(Theta|#920)'   => {'tex' => '{/Symbol Q}', 'web' => "\x{398}"},
                    937:       '(Rho|#929)'     => {'tex' => '{/Symbol R}', 'web' => "\x{3A1}"},
                    938:       '(Sigma|#931)'   => {'tex' => '{/Symbol S}', 'web' => "\x{3A3}"},
                    939:       '(Tau|#932)'     => {'tex' => '{/Symbol T}', 'web' => "\x{3A4}"},
                    940:       '(Upsilon|#933)' => {'tex' => '{/Symbol U}', 'web' => "\x{3A5}"},
                    941:       '(Omega|#937)'   => {'tex' => '{/Symbol W}', 'web' => "\x{3A9}"},
                    942:       '(Xi|#926)'      => {'tex' => '{/Symbol X}', 'web' => "\x{39E}"},
                    943:       '(Psi|#936)'     => {'tex' => '{/Symbol Y}', 'web' => "\x{3A8}"},
                    944:       '(Zeta|#918)'    => {'tex' => '{/Symbol Z}', 'web' => "\x{396}"},
                    945:       '(alpha|#945)'   => {'tex' => '{/Symbol a}', 'web' => "\x{3B1}"},
                    946:       '(beta|#946)'    => {'tex' => '{/Symbol b}', 'web' => "\x{3B2}"},
                    947:       '(chi|#967)'     => {'tex' => '{/Symbol c}', 'web' => "\x{3C7}"},
                    948:       '(delta|#948)'   => {'tex' => '{/Symbol d}', 'web' => "\x{3B4}"},
                    949:       '(epsilon|#949)' => {'tex' => '{/Symbol e}', 'web' => "\x{3B5}"},
                    950:       '(phi|#966)'     => {'tex' => '{/Symbol f}', 'web' => "\x{3C6}"},
                    951:       '(gamma|#947)'   => {'tex' => '{/Symbol g}', 'web' => "\x{3B3}"},
                    952:       '(eta|#951)'     => {'tex' => '{/Symbol h}', 'web' => "\x{3B7}"},
                    953:       '(iota|#953)'    => {'tex' => '{/Symbol i}', 'web' => "\x{3B9}"},
                    954:       '(kappa|#954)'   => {'tex' => '{/Symbol k}', 'web' => "\x{3BA}"},
                    955:       '(lambda|#955)'  => {'tex' => '{/Symbol k}', 'web' => "\x{3BB}"},
                    956:       '(mu|#956)'      => {'tex' => '{/Symbol m}', 'web' => "\x{3BC}"},
                    957:       '(nu|#957)'      => {'tex' => '{/Symbol n}', 'web' => "\x{3BD}"},
                    958:       '(omicron|#959)' => {'tex' => '{/Symbol o}', 'web' => "\x{3BF}"},
                    959:       '(pi|#960)'      => {'tex' => '{/Symbol p}', 'web' => "\x{3C0}"},
                    960:       '(theta|#952)'   => {'tex' => '{/Symbol q}', 'web' => "\x{3B8}"},
                    961:       '(rho|#961)'     => {'tex' => '{/Symbol r}', 'web' => "\x{3C1}"},
                    962:       '(sigma|#963)'   => {'tex' => '{/Symbol s}', 'web' => "\x{3C3}"},
                    963:       '(tau|#964)'     => {'tex' => '{/Symbol t}', 'web' => "\x{3C4}"},
                    964:       '(upsilon|#965)' => {'tex' => '{/Symbol u}', 'web' => "\x{3C5}"},
                    965:       '(omega|#969)'   => {'tex' => '{/Symbol w}', 'web' => "\x{3C9}"},
                    966:       '(xi|#958)'      => {'tex' => '{/Symbol x}', 'web' => "\x{3BE}"},
                    967:       '(psi|#968)'     => {'tex' => '{/Symbol y}', 'web' => "\x{3C8}"},
                    968:       '(zeta|#950)'    => {'tex' => '{/Symbol z}', 'web' => "\x{3B6}"},
                    969:       '(thetasym|#977)' => {'tex' => '{/Symbol \165}', 'web' => "\x{3d1}"},
                    970:       '(upsih|#978)'   => {'tex' => '{/Symbol \241}', 'web' => "\x{3d2}"},
                    971:       '(piv|#982)'     => {'tex' => '{/Symbol \166}', 'web' => "\x{3d6}"},
1.137     foxr      972: 
                    973: 
                    974:       # Punctuation:
                    975:       
1.138     foxr      976:       '(quot|#034)'   => {'tex' =>  '\42',            'web' => '\42'},
                    977:       '(amp|#038)'    => {'tex' =>  '\46',            'web' => '\46'},
                    978:       '(lt|#060)'     => {'tex' =>  '\74',            'web' => '\74'},
                    979:       '(gt|#062)'     => {'tex' =>  '\76',            'web' => '\76'},
1.137     foxr      980:       '#131'          => {'tex' =>  '{/Symbol \246}', 'web' => "\x{192}"},
1.138     foxr      981:       '#132'          => {'tex' => '{/Text \271}',    'web' => "\x{201e}"},
                    982:       '#133'          => {'tex' => '{/Symbol \274}',  'web'=> "\x{2026}"},
                    983:       '#134'          => {'tex' => '{/Text \262}',    'web' => "\x{2020}"},
                    984:       '#135'          => {'tex' => '{/Text \263}',    'web' => "\x{2021}"},
                    985:       '#136'          => {'tex' => '\\\\^',           'web' => '\\\\^'},
1.143     foxr      986:       '#137'          => {'tex' => '%o',              'web' => "\x{2030}"}, # Per Mille <FIX>
                    987:       '#138'          => {'tex' => 'S',               'web' => "\x{160}"}, # S-Caron <FIX>
1.138     foxr      988:       '#139'          => {'tex' => '<',               'web' => '<'},
1.143     foxr      989:       '#140'          => {'tex' => 'AE',              'web' => "\x{152}"}, # AE ligature <FIX>
1.138     foxr      990:       '#145'          => {'tex' => '\140',            'web' => "\x{2018}"},
                    991:       '#146'          => {'tex' => '\47',             'web' => "\x{2019}"},
1.143     foxr      992:       '#147'          => {'tex' => '\140\140',        'web' => "\x{201c}"}, # Left " <FIX>
                    993:       '#148'          => {'tex' => '\47\47',          'web' => '\\"'},      # Right " <FIX>
1.138     foxr      994:       '#149'          => {'tex' => '{/Symbol \267}',  'web' => "\x{2022}"},
1.143     foxr      995:       '#150'          => {'tex' => '{/Text \55}',     'web' => "\x{2013}"},  # en dash
1.138     foxr      996:       '#151'          => {'tex' => '{/Symbol \55}',   'web' => "\x{2014}"},  # em dash
1.143     foxr      997:       '#152'          => {'tex' => '\\\\~',           'web' => '\\\\~'},
                    998:       '#153'          => {'tex' => '{/Symbol \324}',  'web' => "\x{2122}"}, # trademark
1.139     foxr      999: 
                   1000:       # Accented letters, and other furreign language glyphs.
                   1001: 
1.138     foxr     1002:       '#154'          => {'tex' => 's',               'web' => "\x{161}"}, # small s-caron no ps.
                   1003:       '#155'          => {'tex' => '>',               'web' => '\76'},     # >
1.143     foxr     1004:       '#156'          => {'tex' => '{/Text \366}',    'web' => "\x{153}"}, # oe ligature.<FIX>
                   1005:       '#159',         => {'tex' => 'Y',               'web' => "\x{178}"}, # Y-umlaut - can't print <FIX>
1.138     foxr     1006:       '(nbsp|#160)'   => {'tex' => ' ',               'web' => ' '},       # non breaking space.
                   1007:       '(iexcl|#161)'  => {'tex' => '{/Text \241}',    'web' => "\x{a1}"},  # inverted !
                   1008:       '(cent|#162)'   => {'tex' => '{/Text \242}',    'web' => "\x{a2}"},  # Cent currency.
1.142     foxr     1009:       '(pound|#163)'  => {'tex' => '{/Text \243}',    'web' => "\x{a3}"},  # GB Pound currency.
1.143     foxr     1010:       '(curren|#164)' => {'tex' => '{/ZapfDingbats \161}','web' => "\x{a4}"},  # Generic currency symb. <FIX>
1.138     foxr     1011:       '(yen|#165)'    => {'tex' => '{/Text \245}',    'web' => "\x{a5}"},  # Yen currency.
                   1012:       '(brvbar|#166)' => {'tex' => '{/Symbol \174}',  'web' => "\x{a6}"},  # Broken vert bar no print.
                   1013:       '(sect|#167)'   => {'tex' => '{\247}',          'web' => "\x{a7}"},  # Section symbol.
                   1014:       '(uml|#168)'    => {'tex' => '{\250}',          'web' => "\x{a8}"},  # 'naked' umlaut.
                   1015:       '(copy|#169)'   => {'tex' => '{/Symbol \343}',  'web' => "\x{a9}"},  # Copyright symbol.
                   1016:       '(ordf|#170)'   => {'tex' => '{/Text \343}',    'web' => "\x{aa}"},  # Feminine ordinal.
                   1017:       '(laquo|#171)'  => {'tex' => '{/Text \253}',    'web' => "\x{ab}"},  # << quotes.
                   1018:       '(not|#172)'    => {'tex' => '\254',            'web' => "\x{ac}"},  # Logical not.
1.143     foxr     1019:       '(shy|#173)'    => {'tex' => '\255',               'web' => "\x{ad}"},  # soft hyphen.
1.138     foxr     1020:       '(reg|#174)'    => {'tex' => '{/Symbol \342}',  'web' => "\x{ae}"},  # Registered tm.
1.143     foxr     1021:       '(macr|#175)'   => {'tex' => '^{\255}',            'web' => "\x{af}"},  # 'naked' macron (overbar).
                   1022:       '(deg|#176)'    => {'tex' => '{/Text \260}',    'web' => "\x{b0}"},  # Degree symbo..`
1.138     foxr     1023:       '(plusmn|#177)' => {'tex' => '{/Symbol \261}',  'web' => "\x{b1}"},  # +/- symbol.
                   1024:       '(sup2|#178)'   => {'tex' => '^2',              'web' => "\x{b2}"},  # Superscript 2.
                   1025:       '(sup3|#179)'   => {'tex' => '^3',              'web' => "\x{b3}"},  # Superscript 3.
1.143     foxr     1026:       '(acute|#180)'  => {'tex' => '{/Text \222}',    'web' => "\x{b4}"},  # 'naked' acute accent.
1.138     foxr     1027:       '(micro|#181)'  => {'tex' => '{/Symbol \155}',  'web' => "\x{b5}"},  # Micro (small mu).
                   1028:       '(para|#182)'   => {'tex' => '{/Text \266}',    'web' => "\x{b6}"},  # Paragraph symbol.
1.143     foxr     1029:       '(middot|#183)' => {'tex' => '\267',            'web' => "\x{b7}"},  # middle dot
1.138     foxr     1030:       '(cedil|#184)'  => {'tex' => '\233',            'web' => "\x{b8}"},  # 'naked' cedilla.
                   1031:       '(sup1|#185)'   => {'tex' => '^1',              'web' => "\x{b9}"},  # superscript 1.
1.143     foxr     1032:       '(ordm|#186)'   => {'tex' => '{\260}',          'web' => "\x{ba}"},  # masculine ordinal.
1.138     foxr     1033:       '(raquo|#187)', => {'tex' => '\273',            'web' => "\x{bb}"},  # Right angle quotes.
                   1034:       '(frac14|#188)' => {'tex' => '\274',            'web' => "\x{bc}"},  # 1/4.
                   1035:       '(frac12|#189)' => {'tex' => '\275',            'web' => "\x{bd}"},  # 1/2.
                   1036:       '(frac34|#190)' => {'tex' => '\276',            'web' => "\x{be}"},  # 3/4
                   1037:       '(iquest|#191)' => {'tex' => '{/Text \277}',    'web' => "\x{bf}"},  # Inverted ?
                   1038:       '(Agrave|#192)' => {'tex' => '\300',            'web' => "\x{c0}"},  # A Grave.
                   1039:       '(Aacute|#193)' => {'tex' => '\301',            'web' => "\x{c1}"},  # A Acute.
                   1040:       '(Acirc|#194)'  => {'tex' => '\302',            'web' => "\x{c2}"},  # A Circumflex.
                   1041:       '(Atilde|#195)' => {'tex' => '\303',            'web' => "\x{c3}"},  # A tilde.
                   1042:       '(Auml|#196)'   => {'tex' => '\304',            'web' => "\x{c4}"},  # A umlaut.
                   1043:       '(Aring|#197)'  => {'tex' => '\305',            'web' => "\x{c5}"},  # A ring.
1.139     foxr     1044:       '(AElig|#198)'  => {'tex' => '\306',            'web' => "\x{c6}"},  # AE ligature.
                   1045:       '(Ccedil|#199)' => {'tex' => '\307',            'web' => "\x{c7}"},  # C cedilla
                   1046:       '(Egrave|#200)' => {'tex' => '\310',            'web' => "\x{c8}"},  # E Accent grave.
                   1047:       '(Eacute|#201)' => {'tex' => '\311',            'web' => "\x{c9}"},  # E acute accent.
                   1048:       '(Ecirc|#202)'  => {'tex' => '\312',            'web' => "\x{ca}"},  # E Circumflex.
                   1049:       '(Euml|#203)'   => {'tex' => '\313',            'web' => "\x{cb}"},  # E umlaut.
                   1050:       '(Igrave|#204)' => {'tex' => '\314',            'web' => "\x{cc}"},  # I grave accent.
                   1051:       '(Iacute|#205)' => {'tex' => '\315',            'web' => "\x{cd}"},  # I acute accent.
                   1052:       '(Icirc|#206)'  => {'tex' => '\316',            'web' => "\x{ce}"},  # I circumflex.
                   1053:       '(Iuml|#207)'   => {'tex' => '\317',            'web' => "\x{cf}"},  # I umlaut.
                   1054:       '(ETH|#208)'    => {'tex' => '\320',            'web' => "\x{d0}"},  # Icelandic Cap eth.
                   1055:       '(Ntilde|#209)' => {'tex' => '\321',            'web' => "\x{d1}"},  # Ntilde (enyan).
                   1056:       '(Ograve|#210)' => {'tex' => '\322',            'web' => "\x{d2}"},  # O accent grave.
                   1057:       '(Oacute|#211)' => {'tex' => '\323',            'web' => "\x{d3}"},  # O accent acute.
                   1058:       '(Ocirc|#212)'  => {'tex' => '\324',            'web' => "\x{d4}"},  # O circumflex.
                   1059:       '(Otilde|#213)' => {'tex' => '\325',            'web' => "\x{d5}"},  # O tilde.
                   1060:       '(Ouml|#214)'   => {'tex' => '\326',            'web' => "\x{d6}"},  # O umlaut.
                   1061:       '(times|#215)'  => {'tex' => '\327',            'web' => "\x{d7}"},  # Times symbol.
                   1062:       '(Oslash|#216)' => {'tex' => '\330',            'web' => "\x{d8}"},  # O slash.
                   1063:       '(Ugrave|#217)' => {'tex' => '\331',            'web' => "\x{d9}"},  # U accent grave.
                   1064:       '(Uacute|#218)' => {'tex' => '\332',            'web' => "\x{da}"},  # U accent acute.
                   1065:       '(Ucirc|#219)'  => {'tex' => '\333',            'web' => "\x{db}"},  # U circumflex.
                   1066:       '(Uuml|#220)'   => {'tex' => '\334',            'web' => "\x{dc}"},  # U umlaut.
                   1067:       '(Yacute|#221)' => {'tex' => '\335',            'web' => "\x{dd}"},  # Y accent acute.
                   1068:       '(THORN|#222)'  => {'tex' => '\336',            'web' => "\x{de}"},  # Icelandic thorn.
                   1069:       '(szlig|#223)'  => {'tex' => '\337',            'web' => "\x{df}"},  # German sharfes s.
                   1070:       '(agrave|#224)' => {'tex' => '\340',            'web' => "\x{e0}"},  # a accent grave.
                   1071:       '(aacute|#225)' => {'tex' => '\341',            'web' => "\x{e1}"},  # a grave.
                   1072:       '(acirc|#226)'  => {'tex' => '\342',            'web' => "\x{e2}"},  # a circumflex.
                   1073:       '(atilde|#227)' => {'tex' => '\343',            'web' => "\x{e3}"},  # a tilde.
                   1074:       '(auml|#228)'   => {'tex' => '\344',            'web' => "\x{e4}"},  # a umlaut
                   1075:       '(aring|#229)'  => {'tex' => '\345',            'web' => "\x{e5}"},  # a ring on top.
                   1076:       '(aelig|#230)'  => {'tex' => '\346',            'web' => "\x{e6}"},  # ae ligature.
1.142     foxr     1077:       '(ccedil|#231)' => {'tex' => '\347',            'web' => "\x{e7}"},  # C cedilla
1.139     foxr     1078:       '(egrave|#232)' => {'tex' => '\350',            'web' => "\x{e8}"},  # e accent grave.
                   1079:       '(eacute|#233)' => {'tex' => '\351',            'web' => "\x{e9}"},  # e accent acute.
                   1080:       '(ecirc|#234)'  => {'tex' => '\352',            'web' => "\x{ea}" }, # e circumflex.
                   1081:       '(euml|#235)'   => {'tex' => '\353',            'web' => "\x{eb}"},  # e umlaut.
                   1082:       '(igrave|#236)' => {'tex' => '\354',            'web' => "\x{ec}"},  # i grave.
1.142     foxr     1083:       '(iacute|#237)' => {'tex' => '\355',            'web' => "\x{ed}"},  # i acute.
                   1084:       '(icirc|#238)'  => {'tex' => '\356',            'web' => "\x{ee}"},  # i circumflex.
1.139     foxr     1085:       '(iuml|#239)'   => {'tex' => '\357',            'web' => "\x{ef}"},  # i umlaut.
                   1086:       '(eth|#240)'    => {'tex' => '\360',            'web' => "\x{f0}"},  # Icelandic eth.
                   1087:       '(ntilde|#241)' => {'tex' => '\361',            'web' => "\x{f1}"},  # n tilde.
                   1088:       '(ograve|#242)' => {'tex' => '\362',            'web' => "\x{f2}"},  # o grave.
                   1089:       '(oacute|#243)' => {'tex' => '\363',            'web' => "\x{f3}"},  # o acute.
1.143     foxr     1090:       '(ocirc|#244)'  => {'tex' => '\364',            'web' => "\x{f4}"},  # o circumflex.
1.139     foxr     1091:       '(otilde|#245)' => {'tex' => '\365',            'web' => "\x{f5}"},  # o tilde.
                   1092:       '(ouml|#246)'   => {'tex' => '\366',            'web' => "\x{f6}"},  # o umlaut.
                   1093:       '(divide|#247)' => {'tex' => '\367',            'web' => "\x{f7}"},  # division symbol
                   1094:       '(oslash|#248)' => {'tex' => '\370',            'web' => "\x{f8}"},  # o slashed.
                   1095:       '(ugrave|#249)' => {'tex' => '\371',            'web' => "\x{f9}"},  # u accent grave.
                   1096:       '(uacute|#250)' => {'tex' => '\372',            'web' => "\x{fa}"},  # u acute.
                   1097:       '(ucirc|#251)'  => {'tex' => '\373',            'web' => "\x{fb}"},  # u circumflex.
                   1098:       '(uuml|#252)'   => {'tex' => '\374',            'web' => "\x{fc}"},  # u umlaut.
                   1099:       '(yacute|#253)' => {'tex' => '\375',            'web' => "\x{fd}"},  # y acute accent.
                   1100:       '(thorn|#254)'  => {'tex' => '\376',            'web' => "\x{fe}"},  # small thorn (icelandic).
                   1101:       '(yuml|#255)'   => {'tex' => '\377',            'web' => "\x{ff}"},  # y umlaut.
                   1102:       
                   1103:       # Latin extended A entities:
                   1104: 
1.143     foxr     1105:       '(OElig|#338)'  => {'tex' => '{/Text \326}',   'web' => "\x{152}"},  # OE ligature.
                   1106:       '(oelig|#339)'  => {'tex' => '{/Text \366}',   'web' => "\x{153}"},  # oe ligature.
1.139     foxr     1107:       '(Scaron|#352)' => {'tex' => 'S',              'web' => "\x{160}"},  # S caron no printable.
                   1108:       '(scaron|#353)' => {'tex' => 's',              'web' => "\x{161}"},  # s caron no printable.
                   1109:       '(Yuml|#376)'   => {'tex' => 'Y',              'web' => "\x{178}"},  # Y umlaut - no printable.
                   1110: 
                   1111:       # Latin extended B.
                   1112: 
1.143     foxr     1113:       '(fnof|#402)'  => {'tex' =>'{/Symbol \246}',    'web' => "\x{192}"},  # f with little hook.
1.139     foxr     1114: 
1.140     foxr     1115:       # Standalone accents:
1.139     foxr     1116: 
                   1117:       '(circ|#710)'  => {'tex' => '^',               'web' => '^'},        # circumflex.
                   1118:       '(tilde|#732)' => {'tex' => '~',               'web' => '~'},        # tilde.
                   1119: 
1.140     foxr     1120:       # General punctuation.  We're not able to make a distinction between
                   1121:       # the various length spacings in the print version. (e.g. en/em/thin).
                   1122:       # the various joiners will be empty strings in the print version too.
                   1123: 
                   1124: 
                   1125:       '(ensp|#8194)'   => {'tex' => ' ',              'web' => "\x{2002}"}, # en space.
                   1126:       '(emsp|#8195)'   => {'tex' => ' ',              'web' => "\x{2003}"}, # em space.
                   1127:       '(thinsp|#8201)' => {'tex' => ' ',              'web' => "\x{2009}"}, # thin space.
1.144     foxr     1128:       '(zwnj|#8204)'   => {'tex' => ' ',               'web' => "\x{200c}"}, # Zero width non joiner.
                   1129:       '(zwj|#8205)'    => {'tex' => ' ',               'web' => "\x{200d}"}, # Zero width joiner.
                   1130:       '(lrm|#8206)'    => {'tex' => ' ',               'web' => "\x{200e}"}, # Left to right mark
                   1131:       '(rlm|#8207)'    => {'tex' => ' ',               'web' => "\x{200f}"}, # right to left mark.
1.140     foxr     1132:       '(ndash|#8211)'  => {'tex' => '{/Text \55}',    'web' => "\x{2013}"}, # en dash.
                   1133:       '(mdash|#8212)'  => {'tex' => '{/Symbol \55}',  'web' => "\x{2014}"}, # em dash.
                   1134:       '(lsquo|#8216)'  => {'tex' => '{/Text \140}',   'web' => "\x{2018}"}, # Left single quote.
1.144     foxr     1135:       '(rsquo|#8217)'  => {'tex' => '\47',            'web' => "\x{2019}"}, # Right single quote.
                   1136:       '(sbquo|#8218)'  => {'tex' => '\54',             'web' => "\x{201a}"}, # Single low-9 quote.
                   1137:       '(ldquo|#8220)'  => {'tex' => '\42',   'web' => "\x{201c}"}, # Left double quote.
                   1138:       '(rdquo|#8221)'  => {'tex' => '\42',   'web' => "\x{201d}"}, # Right double quote.
                   1139:       '(bdquo|#8222)'  => {'tex' => ',',              'web' => "\x{201e}"}, # Double low-9 quote.
                   1140:       '(dagger|#8224)' => {'tex' => '+',   'web' => "\x{2020}"}, # Is this a dagger I see before me now?
1.145     foxr     1141:       '(Dagger|#8225)' => {'tex' => '\261',   'web' => "\x{2021}"}, # it's handle pointing towards my heart?
1.140     foxr     1142:       '(bull|#8226)'   => {'tex' => '\267',           'web' => "\x{2022}"}, # Bullet.
1.144     foxr     1143:       '(hellep|#8230)' => {'tex' => '{/Symbol \274}',   'web' => "\x{2026}"}, # Ellipses.
                   1144:       '(permil|#8240)' => {'tex' => '%_o',            'web' => "\x{2031}"}, # Per mille.
1.140     foxr     1145:       '(prime|#8242)'  => {'tex' => '\264',           'web' => "\x{2032}"}, # Prime.
                   1146:       '(Prime|#8243)'  => {'tex' => '{/Symbol \262}', 'web' => "\x{2033}"}, # double prime.
1.144     foxr     1147:       '(lsaquo|#8249)' => {'tex' => '<',              'web' => "\x{2039}"}, # < quote.
                   1148:       '(rsaquo|#8250)' => {'tex' => '\74',              'web' => "\x{203a}"}, # > quote.
1.140     foxr     1149:       '(oline|#8254)'  => {'tex' => '{/Symbol \140}', 'web' => "\x{203e}"}, # Overline.
                   1150:       '(frasl|#8260)'  => {'tex' => '/',              'web' => "\x{2044}"}, # Fraction slash.
1.144     foxr     1151:       '(euro|#8364)'   => {'tex' => '{/Symbol \240}', 'web' => "\x{20ac}"}, # Euro currency.
1.140     foxr     1152:       
                   1153:       # Letter like symbols.
                   1154: 
                   1155:       '(weierp|#8472)'  => {'tex' => '{/Symbol \303}', 'web' => "\x{2118}"}, # Power set symbol
                   1156:       '(image|#8465)'   => {'tex' => '{/Symbol \301}', 'web' => "\x{2111}"}, # Imaginary part
                   1157:       '(real|#8476)'    => {'tex' => '{/Symbol \302}', 'web' => "\x{211c}"}, # Real part.
                   1158:       '(trade|#8482)'   => {'tex' => '{/Symbol \344}', 'web' => "\x{2122}"}, # trademark symbol.
                   1159:       '(alefsym|#8501)' => {'tex' => '{/Symbol \300}', 'web' => "\x{2135}"}, # Hebrew alef.
                   1160: 
                   1161:       # Arrows  of various types and directions.
                   1162:       '(larr|#8592)'    => {'tex' => '{/Symbol \254}', 'web' => "\x{2190}"}, # <--
1.142     foxr     1163:       '(uarr|#8593)'    => {'tex' => '{/Symbol \255}', 'web' => "\x{2191}"}, # up arrow.
1.140     foxr     1164:       '(rarr|#8594)'    => {'tex' => '{/Symbol \256}', 'web' => "\x{2192}"}, # -->
                   1165:       '(darr|#8595)'    => {'tex' => '{/Symbol \257}', 'web' => "\x{2193}"}, # down arrow.
                   1166:       '(harr|#8596)'    => {'tex' => '{/Symbol \253}', 'web' => "\x{2194}"}, # <-->
                   1167:       '(crarr|#8629)'   => {'tex' => '{/Symbol \277}', 'web' => "\x{21b5}"}, # corner arrow down and right.
                   1168:       '(lArr|#8656)'    => {'tex' => '{/Symbol \334}', 'web' => "\x{21d0}"}, # <==
                   1169:       '(uArr|#8657)'    => {'tex' => '{/Symbol \335}', 'web' => "\x{21d1}"}, # Up double arrow.
                   1170:       '(rArr|#8658)'    => {'tex' => '{/Symbol \336}', 'web' => "\x{21d2}"}, # ==>
                   1171:       '(dArr|#8659)'    => {'tex' => '{/Symbol \337}', 'web' => "\x{21d3}"}, # Down double arrow.
                   1172:       '(hArr|#8660)'    => {'tex' => '{/Symbol \333}', 'web' => "\x{21d4}"}, # <==>
                   1173: 
                   1174:       # Mathematical operators. For some of these we do the best we can in printing.
                   1175: 
                   1176:       '(forall|#8704)'  => {'tex' => '{/Symbol \42}',   'web' => "\x{2200}"}, # For all.
                   1177:       '(part|#8706)'    => {'tex' => '{/Symbol d}',     'web' => "\x{2202}"}, # partial derivative
                   1178:       '(exist|#8707)'   => {'tex' => '{/Symbol \44}',   'web' => "\x{2203}"}, # There exists.
                   1179:       '(empty|#8709)'   => {'tex' => '{/Symbol \306}',  'web' => "\x{2205}"}, # Null set.
                   1180:       '(nabla|#8711)'   => {'tex' => '{/Symbol \321}',  'web' => "\x{2207}"}, # Gradient e.g.
                   1181:       '(isin|#8712)'    => {'tex' => '{/Symbol \316}',  'web' => "\x{2208}"}, # Element of the set.
1.145     foxr     1182:       '(notin|#8713)'   => {'tex' => '{/Symbol \317}',  'web' => "\x{2209}"}, # Not an element of
1.140     foxr     1183:       '(ni|#8715)'      => {'tex' => '{/Symbol \47}',   'web' => "\x{220b}"}, # Contains as a member
                   1184:       '(prod|#8719)'    => {'tex' => '{/Symbol \325}',  'web' => "\x{220f}"}, # Product 
                   1185:       '(sum|#8721)'     => {'tex' => '{/Symbol \345}',  'web' => "\x{2211}"}, # Sum of.
1.145     foxr     1186:       '(minus|#8722)'   => {'tex' => '{/Symbol \55}',   'web' => "\x{2212}"}, # - sign.
1.140     foxr     1187:       '(lowast|#8727)'  => {'tex' => '*',               'web' => "\x{2217}"}, # * 
                   1188:       '(radic|#8730)'   => {'tex' => '{/Symbol \326}',  'web' => "\x{221a}"}, # Square root. 
                   1189:       '(prop|#8733)'    => {'tex' => '{/Symbol \265}',  'web' => "\x{221d}"}, # Proportional to.
                   1190:       '(infin|#8734)'   => {'tex' => '{/Symbol \245}',  'web' => "\x{221e}"}, # Infinity.
                   1191:       '(ang|#8736)'     => {'tex' => '{/Symbol \320}',  'web' => "\x{2220}"}, # Angle .
                   1192:       '(and|#8743)'     => {'tex' => '{/Symbol \331}',  'web' => "\x{2227}"}, # Logical and.
                   1193:       '(or|#8744)'      => {'tex' => '{/Symbol \332}',  'web' => "\x{2228}"}, # Logical or.
                   1194:       '(cap|#8745)'     => {'tex' => '{/Symbol \307}',  'web' => "\x{2229}"}, # Set intersection.
                   1195:       '(cup|#8746)'     => {'tex' => '{/Symbol \310}',  'web' => "\x{222a}"}, # Set union.
                   1196:       '(int|8747)'      => {'tex' => '{/Symbol \362}',  'web' => "\x{222b}"}, # Integral.
1.145     foxr     1197: 
                   1198:       # Some gnuplot guru will have to explain to me why the next three
                   1199:       # require the extra slashes... else they print very funkily.
                   1200: 
                   1201:       '(there4|#8756)'  => {'tex' => '{/Symbol \\\134}',  'web' => "\x{2234}"}, # Therefore triple dots.
                   1202:       '(sim|#8764)'     => {'tex' => '\\\176',               'web' => "\x{223c}"}, # Simlar to.
                   1203:       '(cong|#8773)'    => {'tex' => '{/Symbol \\\100}','web' => "\x{2245}"}, # Congruent to/with.
                   1204: 
                   1205:       '(asymp|#8776)'   => {'tex' => '{/Symbol \273}',  'web' => "\x{2248}"}, # Asymptotic to.
1.141     foxr     1206:       '(ne|#8800)'      => {'tex' => '{/Symbol \271}',  'web' => "\x{2260}"}, # not equal to.
                   1207:       '(equiv|#8801)'   => {'tex' => '{/Symbol \272}',  'web' => "\x{2261}"}, # Equivalent to.
                   1208:       '(le|8804)'       => {'tex' => '{/Symbol \243}',  'web' => "\x{2264}"}, # Less than or equal to.
                   1209:       '(ge|8805)'       => {'tex' => '{/Symbol \263}',  'web' => "\x{2265}"}, # Greater than or equal to
                   1210:       '(sub|8834)'      => {'tex' => '{/Symbol \314}',  'web' => "\x{2282}"}, # Subset of.
                   1211:       '(sup|8835)'      => {'tex' => '{/Symbol \311}',  'web' => "\x{2283}"}, # Super set of.
                   1212:       '(nsub|8836)'     => {'tex' => '{/Symbol \313}',  'web' => "\x{2284}"}, # not subset of.
                   1213:       '(sube|8838)'     => {'tex' => '{/Symbol \315}',  'web' => "\x{2286}"}, # Subset or equal.
                   1214:       '(supe|8839)'     => {'tex' => '{/Symbol \312}',  'web' => "\x{2287}"}, # Superset or equal
                   1215:       '(oplus|8853)'    => {'tex' => '{/Symbol \305}',  'web' => "\x{2295}"}, # O with plus inside
                   1216:       '(otimes|8855)'   => {'tex' => '{/Symbol \304}',  'web' => "\x{2297}"}, # O with times.
                   1217:       '(perp|8869)'     => {'tex' => '{/Symbol \136}',  'web' => "\x{22a5}"}, # Perpendicular.
                   1218:       '(sdot|8901)'     => {'tex' => '{/Symbol \227}',  'web' => "\x{22c5}"}, # Dot operator.
                   1219: 
                   1220:       # Misc. technical symbols:
                   1221: 
                   1222:       '(lceil|8698)'    => {'tex' => '{/Symbol \351}',  'web' => "\x{2308}"}, # Left ceiling.
                   1223:       '(rceil|8969)'    => {'tex' => '{/Symbol \371}',  'web' => "\x{2309}"}, # Right ceiling.
                   1224:       '(lfloor|8970)'   => {'tex' => '{/Symbol \353}',  'web' => "\x{230a}"}, # Left floor.
                   1225:       '(rfloor|8971)'   => {'tex' => '{/Symbol \373}',  'web' => "\x{230b}"}, # Right floor.
1.145     foxr     1226: 
                   1227:       # The gnuplot png font evidently does not have the big angle brackets at
                   1228:       # positions 0x2329, 0x232a so use ordinary brackets.
                   1229: 
                   1230:       '(lang|9001)'     => {'tex' => '{/Symbol \341}',  'web' => '<'}, # Left angle bracket.
                   1231:       '(rang|9002)'     => {'tex' => '{/Symbol \361}',  'web' => '>'}, # Right angle bracket.
1.141     foxr     1232: 
                   1233:       # Gemoetric shapes.
                   1234: 
                   1235:       '(loz|9674)'      => {'tex' => '{/Symbol \340}',  'web' => "\x{25ca}"}, # Lozenge.
                   1236: 
                   1237:       # Misc. symbols
                   1238: 
                   1239:       '(spades|9824)'   => {'tex' => '{/Symbol \252}', 'web' => "\x{2660}"}, 
                   1240:       '(clubs|9827)'    => {'tex' => '{/Symbol \247}', 'web' => "\x{2663}"}, 
                   1241:       '(hearts|9829)'   => {'tex' => '{/Symbol \251}', 'web' => "\x{2665}"}, 
                   1242:       '(diams|9830)'    => {'tex' => '{/Symbol \250}', 'web' => "\x{2666}"}
1.139     foxr     1243: 
1.133     albertel 1244:     );
                   1245: 
1.128     albertel 1246: 
                   1247: sub replace_entities {
                   1248:     my ($target,$text) = @_;
                   1249:     $text =~ s{([_^~\{\}]|\\\\)}{\\\\$1}g;
                   1250:     while (my ($re, $replace) = each(%lookup)) {
1.137     foxr     1251: 	my $repl = $replace->{$target};
1.128     albertel 1252: 	$text =~ s/&$re;/$replace->{$target}/g;
                   1253:     }
                   1254:     $text =~ s{(&)}{\\\\$1}g;
                   1255:     return $text;
1.127     albertel 1256: }
                   1257: 
1.1       matthew  1258: ##------------------------------------------------------------------- title
                   1259: sub start_title {
                   1260:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1261:     my $result='';
1.51      matthew  1262:     if ($target eq 'web' || $target eq 'tex') {
1.112     albertel 1263: 	$title = &Apache::lonxml::get_all_text("/title",$parser,$style);
1.58      matthew  1264: 	$title=&Apache::run::evaluate($title,$safeeval,$$parstack[-1]);
1.49      matthew  1265: 	$title =~ s/\n/ /g;
1.32      matthew  1266: 	if (length($title) > $max_str_len) {
                   1267: 	    $title = substr($title,0,$max_str_len);
                   1268: 	}
1.128     albertel 1269: 	$title = &parse_label($target,$title);
1.20      matthew  1270:     } elsif ($target eq 'edit') {
1.25      matthew  1271: 	$result.=&Apache::edit::tag_start($target,$token,'Plot Title');
1.112     albertel 1272: 	my $text=&Apache::lonxml::get_all_text("/title",$parser,$style);
1.116     albertel 1273: 	$result.=&Apache::edit::editline('',$text,'',60);
1.20      matthew  1274:     } elsif ($target eq 'modified') {
1.42      matthew  1275: 	$result.=&Apache::edit::rebuild_tag($token);
1.93      albertel 1276: 	$result.=&Apache::edit::modifiedfield("/title",$parser);
1.4       matthew  1277:     }
1.1       matthew  1278:     return $result;
                   1279: }
                   1280: 
                   1281: sub end_title {
                   1282:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1283:     my $result = '';
1.51      matthew  1284:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1285:     } elsif ($target eq 'edit') {
1.27      matthew  1286: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew  1287:     }
1.1       matthew  1288:     return $result;
                   1289: }
                   1290: ##------------------------------------------------------------------- xlabel
                   1291: sub start_xlabel {
                   1292:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1293:     my $result='';
1.51      matthew  1294:     if ($target eq 'web' || $target eq 'tex') {
1.112     albertel 1295: 	$xlabel = &Apache::lonxml::get_all_text("/xlabel",$parser,$style);
1.58      matthew  1296: 	$xlabel=&Apache::run::evaluate($xlabel,$safeeval,$$parstack[-1]);
1.49      matthew  1297: 	$xlabel =~ s/\n/ /g;
1.32      matthew  1298: 	if (length($xlabel) > $max_str_len) {
                   1299: 	    $xlabel = substr($xlabel,0,$max_str_len);
                   1300: 	}
1.128     albertel 1301: 	$xlabel = &parse_label($target,$xlabel);
1.20      matthew  1302:     } elsif ($target eq 'edit') {
1.25      matthew  1303: 	$result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
1.112     albertel 1304: 	my $text=&Apache::lonxml::get_all_text("/xlabel",$parser,$style);
1.116     albertel 1305: 	$result.=&Apache::edit::editline('',$text,'',60);
1.20      matthew  1306:     } elsif ($target eq 'modified') {
1.42      matthew  1307: 	$result.=&Apache::edit::rebuild_tag($token);	
1.93      albertel 1308: 	$result.=&Apache::edit::modifiedfield("/xlabel",$parser);
1.4       matthew  1309:     }
1.1       matthew  1310:     return $result;
                   1311: }
                   1312: 
                   1313: sub end_xlabel {
                   1314:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1315:     my $result = '';
1.51      matthew  1316:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1317:     } elsif ($target eq 'edit') {
1.27      matthew  1318: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew  1319:     }
1.1       matthew  1320:     return $result;
                   1321: }
1.21      matthew  1322: 
1.1       matthew  1323: ##------------------------------------------------------------------- ylabel
                   1324: sub start_ylabel {
                   1325:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1326:     my $result='';
1.51      matthew  1327:     if ($target eq 'web' || $target eq 'tex') {
1.112     albertel 1328: 	$ylabel = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
1.58      matthew  1329: 	$ylabel = &Apache::run::evaluate($ylabel,$safeeval,$$parstack[-1]);
1.49      matthew  1330: 	$ylabel =~ s/\n/ /g;
1.32      matthew  1331: 	if (length($ylabel) > $max_str_len) {
                   1332: 	    $ylabel = substr($ylabel,0,$max_str_len);
                   1333: 	}
1.128     albertel 1334: 	$ylabel = &parse_label($target,$ylabel);
1.20      matthew  1335:     } elsif ($target eq 'edit') {
1.25      matthew  1336: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
1.112     albertel 1337: 	my $text = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
1.116     albertel 1338: 	$result .= &Apache::edit::editline('',$text,'',60);
1.20      matthew  1339:     } elsif ($target eq 'modified') {
1.42      matthew  1340: 	$result.=&Apache::edit::rebuild_tag($token);
1.93      albertel 1341: 	$result.=&Apache::edit::modifiedfield("/ylabel",$parser);
1.4       matthew  1342:     }
1.1       matthew  1343:     return $result;
                   1344: }
                   1345: 
                   1346: sub end_ylabel {
                   1347:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1348:     my $result = '';
1.51      matthew  1349:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1350:     } elsif ($target eq 'edit') {
1.27      matthew  1351: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew  1352:     }
1.1       matthew  1353:     return $result;
                   1354: }
1.21      matthew  1355: 
1.1       matthew  1356: ##------------------------------------------------------------------- label
                   1357: sub start_label {
                   1358:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1359:     my $result='';
1.51      matthew  1360:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew  1361: 	my %label;
                   1362: 	&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
1.11      matthew  1363: 		    $tagstack->[-1]);
1.112     albertel 1364: 	my $text = &Apache::lonxml::get_all_text("/label",$parser,$style);
1.58      matthew  1365: 	$text = &Apache::run::evaluate($text,$safeeval,$$parstack[-1]);
1.49      matthew  1366: 	$text =~ s/\n/ /g;
1.32      matthew  1367: 	$text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
1.128     albertel 1368: 	$label{'text'} = &parse_label($target,$text);
1.17      matthew  1369: 	push(@labels,\%label);
1.20      matthew  1370:     } elsif ($target eq 'edit') {
1.25      matthew  1371: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Label');
1.21      matthew  1372: 	$result .= &edit_attributes($target,$token,\%label_defaults);
1.112     albertel 1373: 	my $text = &Apache::lonxml::get_all_text("/label",$parser,$style);
1.39      matthew  1374: 	$result .= &Apache::edit::end_row().
                   1375: 	    &Apache::edit::start_spanning_row().
1.63      albertel 1376: 	    &Apache::edit::editline('',$text,'',60);
1.20      matthew  1377:     } elsif ($target eq 'modified') {
1.42      matthew  1378: 	&Apache::edit::get_new_args
1.24      matthew  1379: 	    ($token,$parstack,$safeeval,keys(%label_defaults));
1.42      matthew  1380: 	$result.=&Apache::edit::rebuild_tag($token);
1.93      albertel 1381: 	$result.=&Apache::edit::modifiedfield("/label",$parser);
1.4       matthew  1382:     }
1.1       matthew  1383:     return $result;
                   1384: }
                   1385: 
                   1386: sub end_label {
                   1387:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1388:     my $result = '';
1.51      matthew  1389:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1390:     } elsif ($target eq 'edit') {
1.21      matthew  1391: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew  1392:     }
1.1       matthew  1393:     return $result;
                   1394: }
                   1395: 
                   1396: ##------------------------------------------------------------------- curve
                   1397: sub start_curve {
                   1398:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1399:     my $result='';
1.25      matthew  1400:     &Apache::lonxml::register('Apache::lonplot',('function','data'));
                   1401:     push (@Apache::lonxml::namespace,'curve');
1.51      matthew  1402:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew  1403: 	my %curve;
                   1404: 	&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
1.11      matthew  1405: 		    $tagstack->[-1]);
1.17      matthew  1406: 	push (@curves,\%curve);
1.20      matthew  1407:     } elsif ($target eq 'edit') {
1.26      matthew  1408: 	$result .= &Apache::edit::tag_start($target,$token,'Curve');
1.60      matthew  1409: 	$result .= &edit_attributes($target,$token,\%curve_defaults,
1.116     albertel 1410:                                     \@curve_edit_order)
                   1411: 	    .&Apache::edit::end_row()
                   1412: 	    .&Apache::edit::start_spanning_row();
                   1413: 
1.20      matthew  1414:     } elsif ($target eq 'modified') {
                   1415: 	my $constructtag=&Apache::edit::get_new_args
1.35      matthew  1416: 	    ($token,$parstack,$safeeval,keys(%curve_defaults));
1.20      matthew  1417: 	if ($constructtag) {
1.155     foxr     1418: 	    #
                   1419: 	    # Fix up the color attribute as jcolor does not prepend an x
                   1420: 	    #
                   1421: 	    my $value = $token->[2]{'color'};
                   1422: 	    if (defined $value && !($value =~ /^x/)) {
                   1423: 		$token->[2]{'color'} = 'x' . $value;
                   1424: 	    }
1.20      matthew  1425: 	    $result = &Apache::edit::rebuild_tag($token);
                   1426: 	}
1.4       matthew  1427:     }
1.1       matthew  1428:     return $result;
                   1429: }
                   1430: 
                   1431: sub end_curve {
                   1432:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1433:     my $result = '';
1.25      matthew  1434:     pop @Apache::lonxml::namespace;
                   1435:     &Apache::lonxml::deregister('Apache::lonplot',('function','data'));
1.51      matthew  1436:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1437:     } elsif ($target eq 'edit') {
1.21      matthew  1438: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew  1439:     }
1.1       matthew  1440:     return $result;
                   1441: }
1.21      matthew  1442: 
1.1       matthew  1443: ##------------------------------------------------------------ curve function
                   1444: sub start_function {
                   1445:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1446:     my $result='';
1.51      matthew  1447:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew  1448: 	if (exists($curves[-1]->{'data'})) {
1.85      matthew  1449: 	    &Apache::lonxml::warning
                   1450:                 ('Use of the <b>curve function</b> tag precludes use of '.
                   1451:                  ' the <b>curve data</b> tag.  '.
                   1452:                  'The curve data tag will be omitted in favor of the '.
                   1453:                  'curve function declaration.');
1.17      matthew  1454: 	    delete $curves[-1]->{'data'} ;
                   1455: 	}
1.112     albertel 1456:         my $function = &Apache::lonxml::get_all_text("/function",$parser,
                   1457: 						     $style);
1.58      matthew  1458: 	$function = &Apache::run::evaluate($function,$safeeval,$$parstack[-1]);
1.147     www      1459:         $function=~s/\^/\*\*/gs;
1.58      matthew  1460: 	$curves[-1]->{'function'} = $function; 
1.20      matthew  1461:     } elsif ($target eq 'edit') {
1.37      matthew  1462: 	$result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
1.112     albertel 1463: 	my $text = &Apache::lonxml::get_all_text("/function",$parser,$style);
1.116     albertel 1464: 	$result .= &Apache::edit::editline('',$text,'',60);
1.20      matthew  1465:     } elsif ($target eq 'modified') {
1.42      matthew  1466: 	$result.=&Apache::edit::rebuild_tag($token);
1.93      albertel 1467: 	$result.=&Apache::edit::modifiedfield("/function",$parser);
1.4       matthew  1468:     }
1.1       matthew  1469:     return $result;
                   1470: }
                   1471: 
                   1472: sub end_function {
                   1473:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1474:     my $result = '';
1.51      matthew  1475:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1476:     } elsif ($target eq 'edit') {
1.26      matthew  1477: 	$result .= &Apache::edit::end_table();
1.4       matthew  1478:     }
1.1       matthew  1479:     return $result;
                   1480: }
1.21      matthew  1481: 
1.1       matthew  1482: ##------------------------------------------------------------ curve  data
                   1483: sub start_data {
                   1484:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1485:     my $result='';
1.51      matthew  1486:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew  1487: 	if (exists($curves[-1]->{'function'})) {
1.85      matthew  1488: 	    &Apache::lonxml::warning
                   1489:                 ('Use of the <b>curve function</b> tag precludes use of '.
                   1490:                  ' the <b>curve data</b> tag.  '.
                   1491:                  'The curve function tag will be omitted in favor of the '.
                   1492:                  'curve data declaration.');
1.17      matthew  1493: 	    delete($curves[-1]->{'function'});
                   1494: 	}
1.112     albertel 1495: 	my $datatext = &Apache::lonxml::get_all_text("/data",$parser,$style);
1.58      matthew  1496: 	$datatext=&Apache::run::evaluate($datatext,$safeeval,$$parstack[-1]);
1.40      matthew  1497: 	# Deal with cases where we're given an array...
                   1498: 	if ($datatext =~ /^\@/) {
                   1499: 	    $datatext = &Apache::run::run('return "'.$datatext.'"',
                   1500: 					  $safeeval,1);
                   1501: 	}
1.49      matthew  1502: 	$datatext =~ s/\s+/ /g;
1.17      matthew  1503: 	# Need to do some error checking on the @data array - 
                   1504: 	# make sure it's all numbers and make sure each array 
                   1505: 	# is of the same length.
                   1506: 	my @data;
1.35      matthew  1507: 	if ($datatext =~ /,/) { # comma deliminated
1.17      matthew  1508: 	    @data = split /,/,$datatext;
1.95      www      1509: 	} else { # Assume it's space separated.
1.17      matthew  1510: 	    @data = split / /,$datatext;
                   1511: 	}
                   1512: 	for (my $i=0;$i<=$#data;$i++) {
                   1513: 	    # Check that it's non-empty
1.19      matthew  1514: 	    if (! defined($data[$i])) {
                   1515: 		&Apache::lonxml::warning(
1.85      matthew  1516: 		    'undefined curve data value.  Replacing with '.
1.19      matthew  1517: 		    ' pi/e = 1.15572734979092');
                   1518: 		$data[$i] = 1.15572734979092;
                   1519: 	    }
1.17      matthew  1520: 	    # Check that it's a number
1.19      matthew  1521: 	    if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
                   1522: 		&Apache::lonxml::warning(
1.85      matthew  1523: 		    'Bad curve data value of '.$data[$i].'  Replacing with '.
1.19      matthew  1524: 		    ' pi/e = 1.15572734979092');
                   1525: 		$data[$i] = 1.15572734979092;
                   1526: 	    }
1.17      matthew  1527: 	}
1.35      matthew  1528: 	# complain if the number of data points is not the same as
                   1529: 	# in previous sets of data.
1.150     raeburn  1530: 	if (($curves[-1]->{'data'}) && ($#data != $#{$curves[-1]->{'data'}->[0]})){
1.35      matthew  1531: 	    &Apache::lonxml::warning
                   1532: 		('Number of data points is not consistent with previous '.
                   1533: 		 'number of data points');
                   1534: 	}
1.17      matthew  1535: 	push  @{$curves[-1]->{'data'}},\@data;
1.20      matthew  1536:     } elsif ($target eq 'edit') {
1.37      matthew  1537: 	$result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
1.112     albertel 1538: 	my $text = &Apache::lonxml::get_all_text("/data",$parser,$style);
1.116     albertel 1539: 	$result .= &Apache::edit::editline('',$text,'',60);
1.20      matthew  1540:     } elsif ($target eq 'modified') {
1.42      matthew  1541: 	$result.=&Apache::edit::rebuild_tag($token);
1.93      albertel 1542: 	$result.=&Apache::edit::modifiedfield("/data",$parser);
1.4       matthew  1543:     }
1.1       matthew  1544:     return $result;
                   1545: }
                   1546: 
                   1547: sub end_data {
                   1548:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1549:     my $result = '';
1.51      matthew  1550:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1551:     } elsif ($target eq 'edit') {
1.26      matthew  1552: 	$result .= &Apache::edit::end_table();
1.4       matthew  1553:     }
1.1       matthew  1554:     return $result;
                   1555: }
                   1556: 
                   1557: ##------------------------------------------------------------------- axis
                   1558: sub start_axis {
                   1559:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1560:     my $result='';
1.51      matthew  1561:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew  1562: 	&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
                   1563: 			$tagstack->[-1]);
1.20      matthew  1564:     } elsif ($target eq 'edit') {
1.25      matthew  1565: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
1.65      matthew  1566: 	$result .= &edit_attributes($target,$token,\%axis_defaults,
                   1567: 				    \@axis_edit_order);
1.20      matthew  1568:     } elsif ($target eq 'modified') {
1.29      matthew  1569: 	my $constructtag=&Apache::edit::get_new_args
                   1570: 	    ($token,$parstack,$safeeval,keys(%axis_defaults));
1.155     foxr     1571: 
1.29      matthew  1572: 	if ($constructtag) {
1.155     foxr     1573: 	    #
                   1574: 	    #  Fix up the color attribute since jchooser does not
                   1575: 	    #  prepend an x to the color:
                   1576: 	    #
                   1577: 	    my $value = $token->[2]{'color'};
                   1578: 	    if (defined $value && !($value =~ /^x/)) {
                   1579: 		$token->[2]{'color'} = 'x' . $value;
                   1580: 	    }
                   1581: 
1.29      matthew  1582: 	    $result = &Apache::edit::rebuild_tag($token);
                   1583: 	}
1.4       matthew  1584:     }
1.1       matthew  1585:     return $result;
                   1586: }
                   1587: 
                   1588: sub end_axis {
                   1589:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1590:     my $result = '';
1.51      matthew  1591:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew  1592:     } elsif ($target eq 'edit') {
1.21      matthew  1593: 	$result.=&Apache::edit::tag_end($target,$token);
1.20      matthew  1594:     } elsif ($target eq 'modified') {
1.4       matthew  1595:     }
1.1       matthew  1596:     return $result;
                   1597: }
                   1598: 
1.21      matthew  1599: ###################################################################
                   1600: ##                                                               ##
                   1601: ##        Utility Functions                                      ##
                   1602: ##                                                               ##
                   1603: ###################################################################
                   1604: 
1.13      matthew  1605: ##----------------------------------------------------------- set_defaults
                   1606: sub set_defaults {
1.21      matthew  1607:     my ($var,$defaults) = @_;
1.13      matthew  1608:     my $key;
1.24      matthew  1609:     foreach $key (keys(%$defaults)) {
1.13      matthew  1610: 	$var->{$key} = $defaults->{$key}->{'default'};
                   1611:     }
                   1612: }
                   1613: 
1.1       matthew  1614: ##------------------------------------------------------------------- misc
1.2       matthew  1615: sub get_attributes{
1.21      matthew  1616:     my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
1.24      matthew  1617:     foreach my $attr (keys(%{$defaults})) {
1.92      matthew  1618: 	if ($attr eq 'texwidth' || $attr eq 'texfont') {
1.86      albertel 1619: 	    $values->{$attr} = 
                   1620: 		&Apache::lonxml::get_param($attr,$parstack,$safeeval,undef,1);
                   1621: 	} else {
                   1622: 	    $values->{$attr} = 
                   1623: 		&Apache::lonxml::get_param($attr,$parstack,$safeeval);
                   1624: 	}
1.10      matthew  1625: 	if ($values->{$attr} eq '' | !defined($values->{$attr})) {
1.11      matthew  1626: 	    $values->{$attr} = $defaults->{$attr}->{'default'};
1.6       matthew  1627: 	    next;
                   1628: 	}
1.10      matthew  1629: 	my $test = $defaults->{$attr}->{'test'};
                   1630: 	if (! &$test($values->{$attr})) {
1.6       matthew  1631: 	    &Apache::lonxml::warning
                   1632: 		($tag.':'.$attr.': Bad value.'.'Replacing your value with : '
1.11      matthew  1633: 		 .$defaults->{$attr}->{'default'} );
                   1634: 	    $values->{$attr} = $defaults->{$attr}->{'default'};
1.10      matthew  1635: 	}
1.2       matthew  1636:     }
1.11      matthew  1637:     return ;
1.6       matthew  1638: }
1.162   ! foxr     1639: ##
        !          1640: # Generate tic mark specifications.
        !          1641: # 
        !          1642: # @param type - type of tics (xtics or ytics).
        !          1643: # @param spec - Reference to a hash that contains the tic specification.
        !          1644: # @param target - 'tex' if hard copy target.
        !          1645: #
        !          1646: # @return string - the tic specification command.
        !          1647: #
        !          1648: sub generate_tics {
        !          1649:     my ($type, $spec, $target) = @_;
        !          1650:     my $result   = '';
        !          1651: 
        !          1652: 
        !          1653:     if (defined %$spec) {
        !          1654: 
        !          1655: 
        !          1656: 
        !          1657: 	# Major tics:
        !          1658: 
        !          1659: 	$result .= "set $type $spec->{'location'}  ";
        !          1660: 	$result .= ($spec->{'mirror'} eq 'on') ? 'mirror ' : 'nomirror ';
        !          1661: 	$result .= "$spec->{'start'}, ";
        !          1662: 	$result .= "$spec->{'increment'}, ";
        !          1663: 	$result .= "$spec->{'end'} ";
        !          1664: 	if ($target eq 'tex' ) {
        !          1665: 	    $result .= 'font "Helvetica,22"';
        !          1666: 	}
        !          1667: 	$result .= "\n";
        !          1668: 
        !          1669: 	# minor frequency:
        !          1670: 
        !          1671: 	if ($spec->{'minorfreq'} != 0) {
        !          1672: 	    $result .= "set m$type $spec->{'minorfreq'}\n";
        !          1673: 	}
        !          1674:     } else {
        !          1675: 	$result .= "set $type font " . '"Helvetica,22"' ."\n";
        !          1676:     }
        !          1677: 
        !          1678: 
        !          1679:     return $result;
        !          1680: }
1.40      matthew  1681: 
1.15      matthew  1682: ##------------------------------------------------------- write_gnuplot_file
1.6       matthew  1683: sub write_gnuplot_file {
1.51      matthew  1684:     my ($tmpdir,$filename,$target)= @_;
1.124     albertel 1685:     my ($fontsize, $font_properties) =  &get_font($target);
1.6       matthew  1686:     my $gnuplot_input = '';
1.10      matthew  1687:     my $curve;
1.100     matthew  1688:     #
                   1689:     # Check to be sure we do not have any empty curves
                   1690:     my @curvescopy;
                   1691:     foreach my $curve (@curves) {
                   1692:         if (exists($curve->{'function'})) {
                   1693:             if ($curve->{'function'} !~ /^\s*$/) {
                   1694:                 push(@curvescopy,$curve);
                   1695:             }
                   1696:         } elsif (exists($curve->{'data'})) {
                   1697:             foreach my $data (@{$curve->{'data'}}) {
                   1698:                 if (scalar(@$data) > 0) {
                   1699:                     push(@curvescopy,$curve);
                   1700:                     last;
                   1701:                 }
                   1702:             }
                   1703:         }
                   1704:     }
                   1705:     @curves = @curvescopy;
1.6       matthew  1706:     # Collect all the colors
                   1707:     my @Colors;
1.107     foxr     1708:     push @Colors, $Apache::lonplot::plot{'bgcolor'};
                   1709:     push @Colors, $Apache::lonplot::plot{'fgcolor'}; 
                   1710:     push @Colors, (defined($axis{'color'})?$axis{'color'}:$Apache::lonplot::plot{'fgcolor'});
1.9       matthew  1711:     foreach $curve (@curves) {
                   1712: 	push @Colors, ($curve->{'color'} ne '' ? 
                   1713: 		       $curve->{'color'}       : 
1.107     foxr     1714: 		       $Apache::lonplot::plot{'fgcolor'}        );
1.6       matthew  1715:     }
1.155     foxr     1716:     
1.6       matthew  1717:     # set term
1.51      matthew  1718:     if ($target eq 'web') {
1.120     albertel 1719: 	$gnuplot_input .= 'set terminal png enhanced nocrop ';
1.107     foxr     1720: 	$gnuplot_input .= 'transparent ' if ($Apache::lonplot::plot{'transparent'} eq 'on');
1.120     albertel 1721: 	$gnuplot_input .= 'font "'.$Apache::lonnet::perlvar{'lonFontsDir'}.
                   1722: 	    '/'.$font_properties->{'file'}.'.ttf" ';
                   1723: 	$gnuplot_input .= $fontsize;
                   1724: 	$gnuplot_input .= ' size '.$Apache::lonplot::plot{'width'}.','.$Apache::lonplot::plot{'height'}.' ';
1.51      matthew  1725: 	$gnuplot_input .= "@Colors\n";
                   1726: 	# set output
                   1727: 	$gnuplot_input .= "set output\n";
                   1728:     } elsif ($target eq 'tex') {
1.156     foxr     1729: 	$gnuplot_input .= "set term postscript eps enhanced $Apache::lonplot::plot{'plotcolor'} dash ";
1.121     albertel 1730: 	if (!$font_properties->{'tex_no_file'}) {
                   1731: 	    $gnuplot_input .=
                   1732: 		'fontfile "'.$Apache::lonnet::perlvar{'lonFontsDir'}.
                   1733: 		'/'.$font_properties->{'file'}.'.pfb" ';
                   1734: 	}
1.120     albertel 1735: 	$gnuplot_input .= ' "'.$font_properties->{'printname'}.'" ';
                   1736: 	$gnuplot_input .= $fontsize;
1.153     foxr     1737: 	$gnuplot_input .= "\nset output \"".$tmpdir.
1.113     www      1738: 	    &unescape($filename).".eps\"\n";
1.143     foxr     1739: 	$gnuplot_input .= "set encoding iso_8859_1\n"; # Get access to extended font.
                   1740: 
1.87      matthew  1741:     }
1.159     foxr     1742:     $gnuplot_input .= "set encoding utf8\n";
1.115     albertel 1743:     # cartesian or polar plot?
1.107     foxr     1744:     if (lc($Apache::lonplot::plot{'plottype'}) eq 'polar') {
1.87      matthew  1745:         $gnuplot_input .= 'set polar'.$/;
                   1746:     } else {
                   1747:         # Assume Cartesian
1.51      matthew  1748:     }
1.115     albertel 1749:     # cartesian or polar grid?
                   1750:     if (lc($Apache::lonplot::plot{'gridtype'}) eq 'polar') {
                   1751:         $gnuplot_input .= 'set grid polar'.$/;
1.118     albertel 1752:     } elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'linear-log') {
                   1753:         $gnuplot_input .= 'set logscale x'.$/;
                   1754:     } elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'log-linear') {
                   1755:         $gnuplot_input .= 'set logscale y'.$/;
                   1756:     } elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'log-log') {
                   1757:         $gnuplot_input .= 'set logscale x'.$/;
                   1758:         $gnuplot_input .= 'set logscale y'.$/;
1.115     albertel 1759:     } else {
                   1760:         # Assume Cartesian
                   1761:     }
1.110     albertel 1762:     # solid or pattern for boxes?
                   1763:     if (lc($Apache::lonplot::plot{'fillstyle'}) eq 'solid') {
                   1764:         $gnuplot_input .= 'set style fill solid '.
                   1765: 	    $Apache::lonplot::plot{'solid'}.$Apache::lonplot::plot{'box_border'}.$/;
                   1766:     } elsif (lc($Apache::lonplot::plot{'fillstyle'}) eq 'pattern') {
                   1767:         $gnuplot_input .= 'set style fill pattern '.$Apache::lonplot::plot{'pattern'}.$Apache::lonplot::plot{'box_border'}.$/;
                   1768:     } elsif (lc($Apache::lonplot::plot{'fillstyle'}) eq 'empty') {
                   1769:     }
1.101     matthew  1770:     # margin
1.107     foxr     1771:     if (lc($Apache::lonplot::plot{'lmargin'}) ne 'default') {
                   1772:         $gnuplot_input .= 'set lmargin '.$Apache::lonplot::plot{'lmargin'}.$/;
1.101     matthew  1773:     }
1.107     foxr     1774:     if (lc($Apache::lonplot::plot{'rmargin'}) ne 'default') {
                   1775:         $gnuplot_input .= 'set rmargin '.$Apache::lonplot::plot{'rmargin'}.$/;
1.101     matthew  1776:     }
1.107     foxr     1777:     if (lc($Apache::lonplot::plot{'tmargin'}) ne 'default') {
                   1778:         $gnuplot_input .= 'set tmargin '.$Apache::lonplot::plot{'tmargin'}.$/;
1.101     matthew  1779:     }
1.107     foxr     1780:     if (lc($Apache::lonplot::plot{'bmargin'}) ne 'default') {
                   1781:         $gnuplot_input .= 'set bmargin '.$Apache::lonplot::plot{'bmargin'}.$/;
1.101     matthew  1782:     }
1.129     albertel 1783: 
1.101     matthew  1784:     # tic scales
1.129     albertel 1785:     if ($version > 4) {
                   1786: 	$gnuplot_input .= 'set tics scale '.
                   1787: 	    $Apache::lonplot::plot{'major_ticscale'}.', '.$Apache::lonplot::plot{'minor_ticscale'}.$/;
                   1788:     } else {
                   1789:     	$gnuplot_input .= 'set ticscale '.
                   1790: 	    $Apache::lonplot::plot{'major_ticscale'}.' '.$Apache::lonplot::plot{'minor_ticscale'}.$/;
                   1791:     }
1.110     albertel 1792:     #boxwidth
                   1793:     if (lc($Apache::lonplot::plot{'boxwidth'}) ne '') {
                   1794: 	$gnuplot_input .= 'set boxwidth '.$Apache::lonplot::plot{'boxwidth'}.$/;
                   1795:     }
                   1796:     # gridlayer
                   1797:     $gnuplot_input .= 'set grid noxtics noytics front '.$/ 
                   1798: 	if ($Apache::lonplot::plot{'gridlayer'} eq 'on');
                   1799: 
1.7       matthew  1800:     # grid
1.107     foxr     1801:     $gnuplot_input .= 'set grid'.$/ if ($Apache::lonplot::plot{'grid'} eq 'on');
1.7       matthew  1802:     # border
1.107     foxr     1803:     $gnuplot_input .= ($Apache::lonplot::plot{'border'} eq 'on'?
1.9       matthew  1804: 		       'set border'.$/           :
1.67      matthew  1805: 		       'set noborder'.$/         );
1.77      matthew  1806:     # sampling rate for non-data curves
1.107     foxr     1807:     $gnuplot_input .= "set samples $Apache::lonplot::plot{'samples'}\n";
1.67      matthew  1808:     # title, xlabel, ylabel
1.45      matthew  1809:     # titles
1.125     albertel 1810:     my $extra_space_x = ($xtics{'location'} eq 'axis') ? ' 0, -0.5 ' : '';
                   1811:     my $extra_space_y = ($ytics{'location'} eq 'axis') ? ' -0.5, 0 ' : '';
                   1812: 
1.89      matthew  1813:     if ($target eq 'tex') {
1.125     albertel 1814: 	$gnuplot_input .= "set title  \"$title\"          font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($title)) ;
                   1815: 	$gnuplot_input .= "set xlabel \"$xlabel\" $extra_space_x font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($xlabel));
                   1816: 	$gnuplot_input .= "set ylabel \"$ylabel\" $extra_space_y font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($ylabel));
1.89      matthew  1817:     } else {
1.125     albertel 1818:         $gnuplot_input .= "set title  \"$title\"          \n" if (defined($title)) ;
                   1819:         $gnuplot_input .= "set xlabel \"$xlabel\" $extra_space_x \n" if (defined($xlabel));
                   1820:         $gnuplot_input .= "set ylabel \"$ylabel\" $extra_space_y \n" if (defined($ylabel));
1.89      matthew  1821:     }
1.45      matthew  1822:     # tics
1.162   ! foxr     1823:     $gnuplot_input .= &generate_tics('xtics', \%xtics, $target);
        !          1824: 
        !          1825:     $gnuplot_input .= &generate_tics('ytics', \%ytics, $target);
        !          1826: 
1.45      matthew  1827:     # axis
1.23      matthew  1828:     if (%axis) {
1.132     albertel 1829:         if ($axis{'xformat'} ne 'on') {
                   1830:             $gnuplot_input .= "set format x ";
                   1831:             if ($axis{'xformat'} eq 'off') {
                   1832:                 $gnuplot_input .= "\"\"\n";
                   1833:             } else {
                   1834:                 $gnuplot_input .= "\"\%.".$axis{'xformat'}."\"\n";
                   1835:             }
                   1836:         }
                   1837:         if ($axis{'yformat'} ne 'on') {
                   1838:             $gnuplot_input .= "set format y ";
                   1839:             if ($axis{'yformat'} eq 'off') {
                   1840:                 $gnuplot_input .= "\"\"\n";
                   1841:             } else {
                   1842:                 $gnuplot_input .= "\"\%.".$axis{'yformat'}."\"\n";
                   1843:             }
                   1844:         }
1.13      matthew  1845: 	$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
                   1846: 	$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
1.152     faziophi 1847: 		if ($axis{'xzero'} ne 'off') {
                   1848: 			$gnuplot_input .= "set xzeroaxis ";
                   1849: 			if ($axis{'xzero'} eq 'line' || $axis{'xzero'} eq 'thick-line') {
                   1850: 				$gnuplot_input .= "lt -1 ";
                   1851: 				if ($axis{'xzero'} eq 'thick-line') {
                   1852: 					$gnuplot_input .= "lw 3 ";
                   1853: 				}
                   1854: 			}
                   1855: 			$gnuplot_input .= "\n";
                   1856: 		}
                   1857: 		if ($axis{'yzero'} ne 'off') {
                   1858: 			$gnuplot_input .= "set yzeroaxis ";
                   1859: 			if ($axis{'yzero'} eq 'line' || $axis{'yzero'} eq 'thick-line') {
                   1860: 				$gnuplot_input .= "lt -1 ";
                   1861: 				if ($axis{'yzero'} eq 'thick-line') {
                   1862: 					$gnuplot_input .= "lw 3 ";
                   1863: 				}
                   1864: 			}
                   1865: 			$gnuplot_input .= "\n";
                   1866: 		}
1.6       matthew  1867:     }
                   1868:     # Key
1.23      matthew  1869:     if (%key) {
1.9       matthew  1870: 	$gnuplot_input .= 'set key '.$key{'pos'}.' ';
                   1871: 	if ($key{'title'} ne '') {
1.67      matthew  1872: 	    $gnuplot_input .= 'title "'.$key{'title'}.'" ';
1.11      matthew  1873: 	} 
                   1874: 	$gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
1.6       matthew  1875:     } else {
1.9       matthew  1876: 	$gnuplot_input .= 'set nokey'.$/;
1.13      matthew  1877:     }
1.6       matthew  1878:     # labels
1.10      matthew  1879:     my $label;
1.6       matthew  1880:     foreach $label (@labels) {
                   1881: 	$gnuplot_input .= 'set label "'.$label->{'text'}.'" at '.
1.134     raeburn  1882:                           $label->{'xpos'}.','.$label->{'ypos'};
                   1883:         if ($label->{'rotate'} ne '') {
                   1884:             $gnuplot_input .= ' rotate by '.$label->{'rotate'};
                   1885:         }
                   1886:         $gnuplot_input .= ' '.$label->{'justify'};
                   1887: 
1.103     matthew  1888:         if ($target eq 'tex') {
1.124     albertel 1889: 	    $gnuplot_input .=' font "'.$font_properties->{'printname'}.','.$fontsize.'pt"' ;
1.103     matthew  1890:         }
                   1891:         $gnuplot_input .= $/;
1.6       matthew  1892:     }
1.74      matthew  1893:     if ($target eq 'tex') {
1.107     foxr     1894:         $gnuplot_input .="set size 1,".$Apache::lonplot::plot{'height'}/$Apache::lonplot::plot{'width'}*1.38;
1.74      matthew  1895:         $gnuplot_input .="\n";
1.120     albertel 1896:     }
1.6       matthew  1897:     # curves
1.156     foxr     1898:     #
                   1899:     # Each curve will have its very own linestyle.
                   1900:     # (This should work just fine in web rendition I think).
                   1901:     #  The line_xxx variables will hold the elements of the line style.
                   1902:     #  type (solid/dashed), color, width
                   1903:     #
                   1904:     my $linestyle_index = 50;
                   1905:     my $line_width   = '';
                   1906: 
1.160     foxr     1907:     # If arrows are needed there will be an arrow style for each as well:
                   1908:     #
                   1909: 
                   1910:     my $arrow_style_index = 50;
                   1911: 
1.156     foxr     1912:     my $plot_command;
                   1913:     my $plot_type;
                   1914: 
1.9       matthew  1915:     for (my $i = 0;$i<=$#curves;$i++) {
                   1916: 	$curve = $curves[$i];
1.156     foxr     1917: 	$plot_command.= ', ' if ($i > 0);
1.119     albertel 1918: 	if ($target eq 'tex') {
                   1919: 	    $curve->{'linewidth'} *= 2;
                   1920: 	}
1.157     foxr     1921: 	$line_width = $curve->{'linewidth'};
1.6       matthew  1922: 	if (exists($curve->{'function'})) {
1.156     foxr     1923: 	    $plot_type    = 
1.9       matthew  1924: 		$curve->{'function'}.' title "'.
                   1925: 		$curve->{'name'}.'" with '.
1.72      matthew  1926:                 $curve->{'linestyle'};
1.6       matthew  1927: 	} elsif (exists($curve->{'data'})) {
1.40      matthew  1928: 	    # Store data values in $datatext
                   1929: 	    my $datatext = '';
                   1930: 	    #   get new filename
1.70      matthew  1931: 	    my $datafilename = "$tmpdir/$filename.data.$i";
1.40      matthew  1932: 	    my $fh=Apache::File->new(">$datafilename");
                   1933: 	    # Compile data
1.6       matthew  1934: 	    my @Data = @{$curve->{'data'}};
1.9       matthew  1935: 	    my @Data0 = @{$Data[0]};
                   1936: 	    for (my $i =0; $i<=$#Data0; $i++) {
1.10      matthew  1937: 		my $dataset;
1.6       matthew  1938: 		foreach $dataset (@Data) {
1.9       matthew  1939: 		    $datatext .= $dataset->[$i] . ' ';
1.6       matthew  1940: 		}
1.9       matthew  1941: 		$datatext .= $/;
1.6       matthew  1942: 	    }
1.40      matthew  1943: 	    #   write file
                   1944: 	    print $fh $datatext;
1.119     albertel 1945: 	    close($fh);
1.40      matthew  1946: 	    #   generate gnuplot text
1.156     foxr     1947: 	    $plot_type = '"'.$datafilename.'" title "'.
1.40      matthew  1948: 		$curve->{'name'}.'" with '.
                   1949: 		$curve->{'linestyle'};
1.6       matthew  1950: 	}
1.157     foxr     1951: 	my $pointtype = '';
                   1952: 	my $pointsize = '';
                   1953: 
1.160     foxr     1954: 	# Figure out the linestyle:
                   1955: 
                   1956: 	my $lt = $curve->{'linetype'} ne '' ? $curve->{'linetype'} 
                   1957: 	                : 'solid';	# Line type defaults to solid.
                   1958: 	# The mapping of lt -> the actual gnuplot line type depends on the target:
                   1959: 
                   1960: 	if ($target eq 'tex') {
                   1961: 	    $lt = $ps_linetypes{$lt};
                   1962: 	} else {
                   1963: 	    $lt = $linetypes{$lt}
                   1964: 	}
                   1965: 
                   1966: 	my $color = $curve->{'color'};
                   1967: 	$color =~ s/^x/#/;	        # Convert xhex color -> #hex color.   
                   1968: 
                   1969: 	my $style_command = "set style line $linestyle_index $pointtype $pointsize linetype $lt linewidth $line_width lc rgb '$color'\n";
                   1970: 	$gnuplot_input .= $style_command;
                   1971: 
                   1972: 
                   1973: 
1.156     foxr     1974: 	if (($curve->{'linestyle'} eq 'points')      ||
                   1975: 	    ($curve->{'linestyle'} eq 'linespoints') ||
                   1976: 	    ($curve->{'linestyle'} eq 'errorbars')   ||
                   1977: 	    ($curve->{'linestyle'} eq 'xerrorbars')  ||
                   1978: 	    ($curve->{'linestyle'} eq 'yerrorbars')  ||
                   1979: 	    ($curve->{'linestyle'} eq 'xyerrorbars')) {
1.157     foxr     1980: 	    
                   1981: 	    $pointtype =' pointtype '.$curve->{'pointtype'};
                   1982: 	    $pointsize =' pointsize '.$curve->{'pointsize'};
1.156     foxr     1983: 	} elsif ($curve->{'linestyle'} eq 'filledcurves') { 
                   1984: 	    $plot_command.= ' '.$curve->{'limit'};
1.160     foxr     1985: 	} elsif ($curve->{'linestyle'} eq 'vector') {
1.157     foxr     1986: 
1.160     foxr     1987: 	    # Create the arrow head style add it to 
                   1988: 	    # $gnuplot_input..and ensure it gets
                   1989: 	    # Selected in the plot command.
1.157     foxr     1990: 
1.160     foxr     1991: 	    $gnuplot_input .= "set style arrow $arrow_style_index ";
                   1992: 	    $gnuplot_input .= ' ' . $curve->{'arrowhead'};
                   1993: 	    $gnuplot_input .= ' size ' . $curve->{'arrowlength'};
                   1994: 	    $gnuplot_input .= ','.$curve->{'arrowangle'};
                   1995: 	    $gnuplot_input .= ',' . $curve->{'arrowbackangle'}; 
                   1996: 	    $gnuplot_input .=  ' ' . $curve->{'arrowstyle'} . " ls $linestyle_index\n";
1.157     foxr     1997: 
                   1998: 
1.160     foxr     1999: 	    $plot_command  .= "  arrowstyle $arrow_style_index ";
                   2000: 	    $arrow_style_index++;
1.156     foxr     2001: 	}
1.157     foxr     2002: 
                   2003: 
                   2004: 
1.160     foxr     2005: 
                   2006: 	# The condition below is because gnuplot lumps the linestyle in with the 
                   2007: 	# arrowstyle _sigh_.
                   2008: 
                   2009: 	if ($curve->{'linestyle'} ne 'vector') {
                   2010: 	    $plot_command.= " ls $linestyle_index";
                   2011: 	}
                   2012: 
1.156     foxr     2013: 	$gnuplot_input .= 'plot ' . $plot_type . ' ' . $plot_command . "\n";
1.157     foxr     2014: 	$linestyle_index++;	# Each curve get a unique linestyle.
1.6       matthew  2015:     }
1.40      matthew  2016:     # Write the output to a file.
1.162   ! foxr     2017:     &Apache::lonnet::logthis($gnuplot_input);
1.161     foxr     2018:     open (my $fh, "> $tmpdir$filename.data");
                   2019:     binmode($fh, ':utf8');
1.40      matthew  2020:     print $fh $gnuplot_input;
                   2021:     close($fh);
                   2022:     # That's all folks.
                   2023:     return ;
1.2       matthew  2024: }
1.21      matthew  2025: 
                   2026: #---------------------------------------------- check_inputs
                   2027: sub check_inputs {
                   2028:     ## Note: no inputs, no outputs - this acts only on global variables.
                   2029:     ## Make sure we have all the input we need:
1.107     foxr     2030:     if (! %Apache::lonplot::plot) { &set_defaults(\%Apache::lonplot::plot,\%gnuplot_defaults); }
1.23      matthew  2031:     if (! %key ) {} # No key for this plot, thats okay
1.34      matthew  2032: #    if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
1.21      matthew  2033:     if (! defined($title )) {} # No title for this plot, thats okay
                   2034:     if (! defined($xlabel)) {} # No xlabel for this plot, thats okay
                   2035:     if (! defined($ylabel)) {} # No ylabel for this plot, thats okay
                   2036:     if ($#labels < 0) { }      # No labels for this plot, thats okay
                   2037:     if ($#curves < 0) { 
                   2038: 	&Apache::lonxml::warning("No curves specified for plot!!!!");
                   2039: 	return '';
                   2040:     }
                   2041:     my $curve;
                   2042:     foreach $curve (@curves) {
                   2043: 	if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
1.85      matthew  2044: 	    &Apache::lonxml::warning("One of the curves specified did not contain any curve data or curve function declarations\n");
1.21      matthew  2045: 	    return '';
                   2046: 	}
                   2047:     }
                   2048: }
                   2049: 
1.20      matthew  2050: #------------------------------------------------ make_edit
                   2051: sub edit_attributes {
1.34      matthew  2052:     my ($target,$token,$defaults,$keys) = @_;
                   2053:     my ($result,@keys);
                   2054:     if ($keys && ref($keys) eq 'ARRAY') {
                   2055:         @keys = @$keys;
                   2056:     } else {
                   2057: 	@keys = sort(keys(%$defaults));
                   2058:     }
                   2059:     foreach my $attr (@keys) {
1.35      matthew  2060: 	# append a ' ' to the description if it doesn't have one already.
                   2061: 	my $description = $defaults->{$attr}->{'description'};
                   2062: 	$description .= ' ' if ($description !~ / $/);
1.20      matthew  2063: 	if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
1.35      matthew  2064: 	    $result .= &Apache::edit::text_arg
1.38      matthew  2065: 		($description,$attr,$token,
1.154     foxr     2066: 		 $defaults->{$attr}->{'size'},
                   2067: 		$defaults->{$attr}->{'class'});
1.20      matthew  2068: 	} elsif ($defaults->{$attr}->{'edit_type'} eq 'choice') {
1.102     albertel 2069: 	    $result .= &Apache::edit::select_or_text_arg
1.35      matthew  2070: 		($description,$attr,$defaults->{$attr}->{'choices'},$token);
1.45      matthew  2071: 	} elsif ($defaults->{$attr}->{'edit_type'} eq 'onoff') {
1.102     albertel 2072: 	    $result .= &Apache::edit::select_or_text_arg
1.35      matthew  2073: 		($description,$attr,['on','off'],$token);
1.20      matthew  2074: 	}
1.25      matthew  2075: 	$result .= '<br />';
1.20      matthew  2076:     }
                   2077:     return $result;
                   2078: }
1.1       matthew  2079: 
1.21      matthew  2080: 
                   2081: ###################################################################
                   2082: ##                                                               ##
                   2083: ##           Insertion functions for editing plots               ##
                   2084: ##                                                               ##
                   2085: ###################################################################
                   2086: 
1.47      matthew  2087: sub insert_gnuplot {
1.29      matthew  2088:     my $result = '';
1.20      matthew  2089:     #  plot attributes
1.61      matthew  2090:     $result .= "\n<gnuplot ";
1.47      matthew  2091:     foreach my $attr (keys(%gnuplot_defaults)) {
1.61      matthew  2092: 	$result .= "\n     $attr=\"$gnuplot_defaults{$attr}->{'default'}\"";
1.20      matthew  2093:     }
1.61      matthew  2094:     $result .= ">";
1.47      matthew  2095:     # Add the components (most are commented out for simplicity)
1.44      matthew  2096:     # $result .= &insert_key();
                   2097:     # $result .= &insert_axis();
                   2098:     # $result .= &insert_title();    
                   2099:     # $result .= &insert_xlabel();    
                   2100:     # $result .= &insert_ylabel();    
1.20      matthew  2101:     $result .= &insert_curve();
1.50      matthew  2102:     # close up the <gnuplot>
1.61      matthew  2103:     $result .= "\n</gnuplot>";
1.45      matthew  2104:     return $result;
                   2105: }
                   2106: 
1.46      matthew  2107: sub insert_tics {
                   2108:     my $result;
                   2109:     $result .= &insert_xtics() . &insert_ytics;
                   2110:     return $result;
                   2111: }
                   2112: 
1.45      matthew  2113: sub insert_xtics {
                   2114:     my $result;
1.46      matthew  2115:     $result .= "\n    <xtics ";
1.45      matthew  2116:     foreach my $attr (keys(%tic_defaults)) {
1.61      matthew  2117: 	$result .= "\n        $attr=\"$tic_defaults{$attr}->{'default'}\" ";
1.45      matthew  2118:     }
1.61      matthew  2119:     $result .= "/>";
1.45      matthew  2120:     return $result;
                   2121: }
                   2122: 
                   2123: sub insert_ytics {
                   2124:     my $result;
1.46      matthew  2125:     $result .= "\n    <ytics ";
1.45      matthew  2126:     foreach my $attr (keys(%tic_defaults)) {
1.61      matthew  2127: 	$result .= "\n        $attr=\"$tic_defaults{$attr}->{'default'}\" ";
1.45      matthew  2128:     }
1.61      matthew  2129:     $result .= "/>";
1.20      matthew  2130:     return $result;
                   2131: }
                   2132: 
                   2133: sub insert_key {
                   2134:     my $result;
1.61      matthew  2135:     $result .= "\n    <key ";
1.30      matthew  2136:     foreach my $attr (keys(%key_defaults)) {
1.61      matthew  2137: 	$result .= "\n         $attr=\"$key_defaults{$attr}->{'default'}\"";
1.20      matthew  2138:     }
1.61      matthew  2139:     $result .= " />";
1.20      matthew  2140:     return $result;
                   2141: }
                   2142: 
                   2143: sub insert_axis{
                   2144:     my $result;
1.46      matthew  2145:     $result .= "\n    <axis ";
1.30      matthew  2146:    foreach my $attr (keys(%axis_defaults)) {
1.61      matthew  2147: 	$result .= "\n         $attr=\"$axis_defaults{$attr}->{'default'}\"";
1.20      matthew  2148:     }
1.61      matthew  2149:     $result .= " />";
1.20      matthew  2150:     return $result;
                   2151: }
1.28      matthew  2152: 
1.61      matthew  2153: sub insert_title  { return "\n    <title></title>"; }
                   2154: sub insert_xlabel { return "\n    <xlabel></xlabel>"; }
                   2155: sub insert_ylabel { return "\n    <ylabel></ylabel>"; }
1.20      matthew  2156: 
                   2157: sub insert_label {
                   2158:     my $result;
1.46      matthew  2159:     $result .= "\n    <label ";
1.30      matthew  2160:     foreach my $attr (keys(%label_defaults)) {
1.61      matthew  2161: 	$result .= "\n         $attr=\"".
                   2162:             $label_defaults{$attr}->{'default'}."\"";
1.20      matthew  2163:     }
1.61      matthew  2164:     $result .= "></label>";
1.20      matthew  2165:     return $result;
                   2166: }
                   2167: 
                   2168: sub insert_curve {
                   2169:     my $result;
1.41      matthew  2170:     $result .= "\n    <curve ";
1.30      matthew  2171:     foreach my $attr (keys(%curve_defaults)) {
1.61      matthew  2172: 	$result .= "\n         $attr=\"".
                   2173: 	    $curve_defaults{$attr}->{'default'}."\"";
1.20      matthew  2174:     }
1.61      matthew  2175:     $result .= " >";
                   2176:     $result .= &insert_data().&insert_data()."\n    </curve>";
1.20      matthew  2177: }
1.4       matthew  2178: 
1.20      matthew  2179: sub insert_function {
                   2180:     my $result;
1.61      matthew  2181:     $result .= "\n        <function></function>";
1.20      matthew  2182:     return $result;
                   2183: }
1.4       matthew  2184: 
1.20      matthew  2185: sub insert_data {
                   2186:     my $result;
1.61      matthew  2187:     $result .= "\n        <data></data>";
1.20      matthew  2188:     return $result;
                   2189: }
1.4       matthew  2190: 
1.48      matthew  2191: ##----------------------------------------------------------------------
1.20      matthew  2192: 1;
                   2193: __END__
1.4       matthew  2194: 
                   2195: 
1.149     jms      2196: =head1 NAME
                   2197: 
                   2198: Apache::lonplot.pm
                   2199: 
                   2200: =head1 SYNOPSIS
                   2201: 
                   2202: XML-based plotter of graphs
                   2203: 
                   2204: This is part of the LearningOnline Network with CAPA project
                   2205: described at http://www.lon-capa.org.
                   2206: 
                   2207: 
                   2208: =head1 SUBROUTINES (parsing and edit rendering)
                   2209: 
                   2210: =over
                   2211: 
                   2212: =item start_gnuplot()
                   2213: 
                   2214: =item end_gnuplot()
                   2215: 
                   2216: =item start_xtics()
                   2217: 
                   2218: =item end_xtics()
                   2219: 
                   2220: =item start_ytics()
                   2221: 
                   2222: =item end_ytics()
                   2223: 
                   2224: =item get_font()
                   2225: 
                   2226: =item start_key()
                   2227: 
                   2228: =item end_key()
                   2229: 
                   2230: =item parse_label()
                   2231: 
                   2232: =item replace_entities()
                   2233: 
                   2234: =item start_title()
                   2235: 
                   2236: =item end_title()
                   2237: 
                   2238: =item start_xlabel()
                   2239: 
                   2240: =item end_xlabel()
                   2241: 
                   2242: =item start_ylabel()
                   2243: 
                   2244: =item end_label()
                   2245: 
                   2246: =item start_curve()
                   2247: 
                   2248: =item end_curve()
                   2249: 
                   2250: =item start_function()
                   2251: 
                   2252: =item end_function()
                   2253: 
                   2254: =item start_data()
                   2255: 
                   2256: =item end_data()
                   2257: 
                   2258: =item start_axis()
                   2259: 
                   2260: =item end_axis
                   2261: 
                   2262: =back
                   2263: 
                   2264: =head1 SUBROUTINES (Utility)
                   2265: 
                   2266: =over
                   2267: 
                   2268: =item set_defaults()
                   2269: 
                   2270: =item get_attributes()
                   2271: 
                   2272: =item write_gnuplot_file()
                   2273: 
                   2274: =item check_inputs()
                   2275: 
                   2276: =item edit_attributes()
                   2277: 
                   2278: =back
                   2279: 
                   2280: =head1 SUBROUTINES (Insertion functions for editing plots)
                   2281: 
                   2282: =over
                   2283: 
                   2284: =item insert_gnuplot()
                   2285: 
                   2286: =item insert_tics()
                   2287: 
                   2288: =item insert_xtics()
                   2289: 
                   2290: =item insert_key()
                   2291: 
                   2292: =item insert_axis()
                   2293: 
                   2294: =item insert_title()
                   2295: 
                   2296: =item insert_xlabel()
                   2297: 
                   2298: =item insert_ylabel()
                   2299: 
                   2300: =item insert_label()
                   2301: 
                   2302: =item insert_curve()
                   2303: 
                   2304: =item insert_function()
                   2305: 
                   2306: =item insert_data()
                   2307: 
                   2308: =back
                   2309: 
                   2310: =cut

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