Annotation of loncom/xml/lonplot.pm, revision 1.56

1.1       matthew     1: # The LearningOnline Network with CAPA
                      2: # Dynamic plot
                      3: #
1.56    ! albertel    4: # $Id: lonplot.pm,v 1.55 2002/03/06 19:55:30 matthew 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: #
1.3       matthew    28: # 12/15/01 Matthew
1.31      matthew    29: # 12/17 12/18 12/19 12/20 12/21 12/27 12/28 12/30 12/31 Matthew
                     30: # 01/01/02 Matthew
1.35      matthew    31: # 01/02 01/03 01/04 01/07 01/08 01/09 Matthew
1.52      matthew    32: # 01/21 02/05 02/06 2/28Matthew
1.35      matthew    33: 
1.1       matthew    34: package Apache::lonplot;
1.10      matthew    35: 
1.1       matthew    36: use strict;
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;
1.10      matthew    41: 
1.33      harris41   42: BEGIN {
1.47      matthew    43:   &Apache::lonxml::register('Apache::lonplot',('gnuplot'));
1.1       matthew    44: }
                     45: 
1.10      matthew    46: ## 
                     47: ## Description of data structures:
                     48: ##
                     49: ##  %plot       %key    %axis
                     50: ## --------------------------
                     51: ##  height      title   color
                     52: ##  width       box     xmin
                     53: ##  bgcolor     pos     xmax
                     54: ##  fgcolor             ymin
                     55: ##  transparent         ymax
                     56: ##  grid
                     57: ##  border
                     58: ##  font
1.19      matthew    59: ##  align
1.10      matthew    60: ##
                     61: ##  @labels: $labels[$i] = \%label
                     62: ##           %label: text, xpos, ypos, justify
1.14      matthew    63: ##
1.10      matthew    64: ##  @curves: $curves[$i] = \%curve
1.14      matthew    65: ##           %curve: name, linestyle, ( function | data )
1.10      matthew    66: ##
                     67: ##  $curves[$i]->{'data'} = [ [x1,x2,x3,x4],
                     68: ##                            [y1,y2,y3,y4] ]
                     69: ##
1.21      matthew    70: 
                     71: ###################################################################
                     72: ##                                                               ##
                     73: ##        Tests used in checking the validitity of input         ##
                     74: ##                                                               ##
                     75: ###################################################################
1.29      matthew    76: 
1.32      matthew    77: my $max_str_len = 50;    # if a label, title, xlabel, or ylabel text
                     78:                          # is longer than this, it will be truncated.
                     79: 
1.29      matthew    80: my %linestyles = 
                     81:     (
                     82:      lines          => 2,     # Maybe this will be used in the future
                     83:      linespoints    => 2,     # to check on whether or not they have 
                     84:      dots	    => 2,     # supplied enough <data></data> fields
                     85:      points         => 2,     # to use the given line style.  But for
                     86:      steps	    => 2,     # now there are more important things 
                     87:      fsteps	    => 2,     # for me to deal with.
                     88:      histeps        => 2,
1.34      matthew    89:      errorbars	    => 3,
                     90:      xerrorbars	    => [3,4],
                     91:      yerrorbars	    => [3,4],
1.35      matthew    92:      xyerrorbars    => [4,6],
1.34      matthew    93:      boxes          => 3,
1.35      matthew    94: #     boxerrorbars   => [3,4,5],
                     95: #     boxxyerrorbars => [4,6,7],
                     96: #     financebars    => 5,
                     97: #     candlesticks   => 5,
                     98:      vector	    => 4
1.29      matthew    99:     );		    
                    100: 
1.11      matthew   101: my $int_test       = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
1.19      matthew   102: my $real_test      = 
                    103:     sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d*\.?\d*([eE][+-]\d+)?$/};
1.11      matthew   104: my $color_test     = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-f]{6}$/};
1.1       matthew   105: my $onoff_test     = sub {$_[0]=~/^(on|off)$/};
1.15      matthew   106: my $key_pos_test   = sub {$_[0]=~/^(top|bottom|right|left|outside|below| )+$/};
1.1       matthew   107: my $sml_test       = sub {$_[0]=~/^(small|medium|large)$/};
1.29      matthew   108: my $linestyle_test = sub {exists($linestyles{$_[0]})};
1.15      matthew   109: my $words_test     = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w\(\)]+ ?)+$/};
1.21      matthew   110: 
                    111: ###################################################################
                    112: ##                                                               ##
                    113: ##                      Attribute metadata                       ##
                    114: ##                                                               ##
                    115: ###################################################################
1.47      matthew   116: my @gnuplot_edit_order = 
1.37      matthew   117:     qw/bgcolor fgcolor height width font transparent grid border align/;
1.48      matthew   118: 
                    119: my $gnuplot_help_text = <<"ENDPLOTHELP";
                    120: <p>
                    121: The <b>gnuplot</b> tag allows an author to design a plot which can
                    122: be created on the fly.  This is intended for use in homework problems
                    123: where each student needs to see a distinct plot.  It can be used in
                    124: conjunction with a <b>script</b> tag to generate random plots.
                    125: </p><p>
                    126: A <b>gnuplot</b> tag can contain the following sub-tags:
                    127: </p>
                    128: <dl>
                    129: <dt> Plot Label
                    130:     <dd> Allows you to place text at a given (x,y) coordinate on the plot.
                    131: <dt> Plot Title
                    132:     <dd> The title of the plot
                    133: <dt> Plot Xlabel
                    134:     <dd> The label on the horizontal axis of the plot
                    135: <dt> Plot Ylabel
                    136:     <dd> The label on the vertical axis of the plot
                    137: <dt> Plot Axes
                    138:     <dd> allows specification of the x and y ranges displayed in the plot
                    139: <dt> Plot Key
                    140:     <dd> Lists the functions displayed in the plot.
                    141: <dt> Plot Curve
                    142:     <dd> Sets the data used in the plot.
                    143: <dt> Plot Tics
                    144:     <dd> Allows specification of the x and y coordinate 'tics' on the axes.
                    145: This is mostly used to adjust the grid lines when a grid is displayed.
                    146: </dl>
1.55      matthew   147: If you are having trouble with your plot, please read the help
                    148: available on Plot Curve.
1.48      matthew   149: ENDPLOTHELP
                    150: 
1.47      matthew   151: my %gnuplot_defaults = 
1.1       matthew   152:     (
1.20      matthew   153:      height       => {
                    154: 	 default     => 200,
                    155: 	 test        => $int_test,
1.29      matthew   156: 	 description => 'height of image (pixels)',
1.38      matthew   157:       	 edit_type   => 'entry',
                    158: 	 size        => '10'
1.20      matthew   159: 	 },
                    160:      width        => {
                    161: 	 default     => 200,
                    162: 	 test        => $int_test,
1.29      matthew   163: 	 description => 'width of image (pixels)',
1.38      matthew   164: 	 edit_type   => 'entry',
                    165: 	 size        => '10'
1.20      matthew   166: 	 },
                    167:      bgcolor      => {
                    168: 	 default     => 'xffffff',
                    169: 	 test        => $color_test, 
                    170: 	 description => 'background color of image (xffffff)',
1.38      matthew   171: 	 edit_type   => 'entry',
                    172: 	 size        => '10'
1.20      matthew   173: 	 },
                    174:      fgcolor      => {
                    175: 	 default     => 'x000000',
                    176: 	 test        => $color_test,
                    177: 	 description => 'foreground color of image (x000000)',
1.38      matthew   178: 	 edit_type   => 'entry',
                    179: 	 size        => '10'
1.20      matthew   180: 	 },
                    181:      transparent  => {
                    182: 	 default     => 'off',
                    183: 	 test        => $onoff_test, 
1.34      matthew   184: 	 description => 'Transparent image',
1.45      matthew   185: 	 edit_type   => 'onoff'
1.20      matthew   186: 	 },
                    187:      grid         => {
                    188: 	 default     => 'off',
                    189: 	 test        => $onoff_test, 
1.34      matthew   190: 	 description => 'Display grid',
1.45      matthew   191: 	 edit_type   => 'onoff'
1.20      matthew   192: 	 },
                    193:      border       => {
                    194: 	 default     => 'on',
                    195: 	 test        => $onoff_test, 
1.34      matthew   196: 	 description => 'Draw border around plot',
1.45      matthew   197: 	 edit_type   => 'onoff'
1.20      matthew   198: 	 },
                    199:      font         => {
                    200: 	 default     => 'medium',
                    201: 	 test        => $sml_test,
                    202: 	 description => 'Size of font to use',
                    203: 	 edit_type   => 'choice',
                    204: 	 choices     => ['small','medium','large']
                    205: 	 },
                    206:      align        => {
                    207: 	 default     => 'left',
                    208: 	 test        => sub {$_[0]=~/^(left|right|center)$/},
                    209: 	 description => 'alignment for image in html',
                    210: 	 edit_type   => 'choice',
                    211: 	 choices     => ['left','right','center']
                    212: 	 } 
1.1       matthew   213:      );
                    214: 
                    215: my %key_defaults = 
                    216:     (
1.20      matthew   217:      title => { 
                    218: 	 default => '',
                    219: 	 test => $words_test,
                    220: 	 description => 'Title of key',
1.38      matthew   221: 	 edit_type   => 'entry',
                    222: 	 size        => '40'
1.20      matthew   223: 	 },
                    224:      box   => { 
                    225: 	 default => 'off',
                    226: 	 test => $onoff_test,
                    227: 	 description => 'Draw a box around the key?',
1.45      matthew   228: 	 edit_type   => 'onoff'
1.20      matthew   229: 	 },
                    230:      pos   => { 
                    231: 	 default => 'top right', 
                    232: 	 test => $key_pos_test, 
                    233: 	 description => 'position of the key on the plot',
                    234: 	 edit_type   => 'choice',
                    235: 	 choices     => ['top left','top right','bottom left','bottom right',
                    236: 			 'outside','below']
                    237: 	 }
1.1       matthew   238:      );
                    239: 
                    240: my %label_defaults = 
                    241:     (
1.20      matthew   242:      xpos    => {
                    243: 	 default => 0,
                    244: 	 test => $real_test,
                    245: 	 description => 'x position of label (graph coordinates)',
1.38      matthew   246: 	 edit_type   => 'entry',
                    247: 	 size        => '10'
1.20      matthew   248: 	 },
                    249:      ypos    => {
                    250: 	 default => 0, 
                    251: 	 test => $real_test,
                    252: 	 description => 'y position of label (graph coordinates)',
1.38      matthew   253: 	 edit_type   => 'entry',
                    254: 	 size        => '10'
1.20      matthew   255: 	 },
                    256:      justify => {
                    257: 	 default => 'left',    
                    258: 	 test => sub {$_[0]=~/^(left|right|center)$/},
                    259: 	 description => 'justification of the label text on the plot',
                    260: 	 edit_type   => 'choice',
                    261: 	 choices     => ['left','right','center']
                    262:      }
1.1       matthew   263:      );
                    264: 
1.45      matthew   265: my @tic_edit_order = ('location','mirror','start','increment','end');
                    266: my %tic_defaults =
                    267:     (
                    268:      location => {
                    269: 	 default => 'border', 
                    270: 	 test => sub {$_[0]=~/^(border|axis)$/},
                    271: 	 description => 'Location of tick marks',
                    272: 	 edit_type   => 'choice',
                    273: 	 choices     => ['border','axis']
                    274: 	 },
                    275:      mirror => {
                    276: 	 default => 'on', 
                    277: 	 test => $onoff_test,
                    278: 	 description => 'mirror ticks on opposite axis?',
                    279: 	 edit_type   => 'onoff'
                    280: 	 },
                    281:      start => {
                    282: 	 default => '-10.0',
                    283: 	 test => $real_test,
                    284: 	 description => 'Start ticks at',
                    285: 	 edit_type   => 'entry',
                    286: 	 size        => '10'
                    287: 	 },
                    288:      increment => {
                    289: 	 default => '1.0',
                    290: 	 test => $real_test,
                    291: 	 description => 'Place a tick every',
                    292: 	 edit_type   => 'entry',
                    293: 	 size        => '10'
                    294: 	 },
                    295:      end => {
                    296: 	 default => ' 10.0',
                    297: 	 test => $real_test,
                    298: 	 description => 'Stop ticks at ',
                    299: 	 edit_type   => 'entry',
                    300: 	 size        => '10'
                    301: 	 },
                    302:      );
                    303: 
1.1       matthew   304: my %axis_defaults = 
                    305:     (
1.28      matthew   306:      color   => {
1.20      matthew   307: 	 default => 'x000000', 
                    308: 	 test => $color_test,
                    309: 	 description => 'color of axes (x000000)',
1.38      matthew   310: 	 edit_type   => 'entry',
                    311: 	 size        => '10'
1.20      matthew   312: 	 },
                    313:      xmin      => {
                    314: 	 default => '-10.0',
                    315: 	 test => $real_test,
                    316: 	 description => 'minimum x-value shown in plot',
1.38      matthew   317: 	 edit_type   => 'entry',
                    318: 	 size        => '10'
1.20      matthew   319: 	 },
                    320:      xmax      => {
                    321: 	 default => ' 10.0',
                    322: 	 test => $real_test,
                    323: 	 description => 'maximum x-value shown in plot',	 
1.38      matthew   324: 	 edit_type   => 'entry',
                    325: 	 size        => '10'
1.20      matthew   326: 	 },
                    327:      ymin      => {
                    328: 	 default => '-10.0',
                    329: 	 test => $real_test,
                    330: 	 description => 'minimum y-value shown in plot',	 
1.38      matthew   331: 	 edit_type   => 'entry',
                    332: 	 size        => '10'
1.20      matthew   333: 	 },
                    334:      ymax      => {
                    335: 	 default => ' 10.0',
                    336: 	 test => $real_test,
                    337: 	 description => 'maximum y-value shown in plot',	 
1.38      matthew   338: 	 edit_type   => 'entry',
                    339: 	 size        => '10'
1.20      matthew   340: 	 }
1.1       matthew   341:      );
                    342: 
1.48      matthew   343: my $curve_help_text = <<"ENDCURVEHELP";
                    344: The <b>curve</b> tag is where you set the data to be plotted by gnuplot.
                    345: There are two ways of entering the information:
                    346: <dl>
                    347:     <dt> Curve Data
                    348:     <dd> Using a <b>data</b> tag you can specify the numbers used to produce 
                    349: the plot.  
                    350: <p>
                    351: By default, two <b>data</b> tags will be available in a plot.  The
                    352: first will specify X coordinates of the data and the second will
                    353: give the Y coordinates of the data.  When working with a linestyle that 
                    354: requires more than two data sets, inserting another <b>data</b> tag is
                    355: required.  Unfortunately, you must make sure the <b>data</b> tags appear
                    356: in the order gnuplot expects the data.
                    357: </p><p>
                    358: Specifying the data should usually be done with a perl variable or array, 
                    359: such as \@Xdata and \@Ydata.  You may also specify numerical data seperated 
                    360: by commas.  Again, the order of the <b>data</b> tags is important.  The
                    361: first tag will be the X data and the second will be the Y data.
                    362: </p>
                    363:     <dt> Curve Function
                    364:     <dd> The <b>function</b> tag allows you to specify the curve to be 
                    365: plotted as a formula that gnuplot can understand.  Be careful using this
                    366: tag - it is surprisingly easy to give gnuplot a function it cannot deal
                    367: with properly.  Be explicit: 2*sin(2*3.141592*x/4) will work but
                    368: 2sin(2*3.141592x/4) will not.  If you do not receive any errors in the
                    369: gnuplot data but still do not have an image produced, it is likely there
                    370: is an error in your <b>function</b> tag.
                    371: </dl>
                    372: ENDCURVEHELP
                    373: 
1.1       matthew   374: my %curve_defaults = 
                    375:     (
1.20      matthew   376:      color     => {
                    377: 	 default => 'x000000',
                    378: 	 test => $color_test,
                    379: 	 description => 'color of curve (x000000)',
1.38      matthew   380: 	 edit_type   => 'entry',
                    381: 	 size        => '10'
1.20      matthew   382: 	 },
                    383:      name      => {
                    384: 	 default => '',
                    385: 	 test => $words_test,
                    386: 	 description => 'name of curve to appear in key',
1.38      matthew   387: 	 edit_type   => 'entry',
                    388: 	 size        => '20'
1.20      matthew   389: 	 },
                    390:      linestyle => {
                    391: 	 default => 'lines',
                    392: 	 test => $linestyle_test,
1.35      matthew   393: 	 description => 'Line style',
1.20      matthew   394: 	 edit_type   => 'choice',
1.38      matthew   395: 	 choices     => [keys(%linestyles)]
1.20      matthew   396: 	 }
1.1       matthew   397:      );
                    398: 
1.21      matthew   399: ###################################################################
                    400: ##                                                               ##
                    401: ##                    parsing and edit rendering                 ##
                    402: ##                                                               ##
                    403: ###################################################################
1.45      matthew   404: my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
1.1       matthew   405: 
1.47      matthew   406: sub start_gnuplot {
1.23      matthew   407:     %plot    = ();      %key     = ();      %axis   = (); 
1.10      matthew   408:     $title   = undef;   $xlabel  = undef;   $ylabel = undef;
                    409:     $#labels = -1;      $#curves = -1;
1.45      matthew   410:     %xtics    = ();      %ytics    = ();
1.6       matthew   411:     #
1.1       matthew   412:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    413:     my $result='';
1.25      matthew   414:     &Apache::lonxml::register('Apache::lonplot',
1.45      matthew   415: 	     ('title','xlabel','ylabel','key','axis','label','curve',
                    416: 	      'xtics','ytics'));
1.29      matthew   417:     push (@Apache::lonxml::namespace,'lonplot');
1.51      matthew   418:     if ($target eq 'web' || $target eq 'tex') {
1.47      matthew   419: 	my $inside = &Apache::lonxml::get_all_text("/gnuplot",$$parser[-1]);
1.17      matthew   420: 	$inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
1.29      matthew   421: 	&Apache::lonxml::newparser($parser,\$inside);
1.47      matthew   422: 	&get_attributes(\%plot,\%gnuplot_defaults,$parstack,$safeeval,
1.17      matthew   423: 			$tagstack->[-1]);
1.20      matthew   424:     } elsif ($target eq 'edit') {
1.47      matthew   425: 	$result .= &Apache::edit::tag_start($target,$token,'GnuPlot');
1.48      matthew   426: 	$result .= &make_javascript();
                    427: 	$result .= &help_win($gnuplot_help_text);
1.47      matthew   428: 	$result .= &edit_attributes($target,$token,\%gnuplot_defaults,
                    429: 				    \@gnuplot_edit_order);
1.20      matthew   430:     } elsif ($target eq 'modified') {
                    431: 	my $constructtag=&Apache::edit::get_new_args
1.47      matthew   432: 	    ($token,$parstack,$safeeval,keys(%gnuplot_defaults));
1.20      matthew   433: 	if ($constructtag) {
                    434: 	    $result = &Apache::edit::rebuild_tag($token);
                    435: 	}
1.4       matthew   436:     }
1.21      matthew   437:     return $result;
1.1       matthew   438: }
                    439: 
1.47      matthew   440: sub end_gnuplot {
1.1       matthew   441:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    442:     pop @Apache::lonxml::namespace;
1.4       matthew   443:     &Apache::lonxml::deregister('Apache::lonplot',
                    444: 	('title','xlabel','ylabel','key','axis','label','curve'));
                    445:     my $result = '';
1.56    ! albertel  446:     my $randnumber;
        !           447:     # need to call rand everytime start_script would evaluate, as the
        !           448:     # safe space rand number generator and the global rand generator 
        !           449:     # are not seperate
        !           450:     if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
        !           451: 	$target eq 'answer') {
        !           452:       $randnumber=int(rand(1000));
        !           453:     }
1.51      matthew   454:     if ($target eq 'web' || $target eq 'tex') {
1.21      matthew   455: 	&check_inputs(); # Make sure we have all the data we need
1.13      matthew   456: 	##
                    457: 	## Determine filename
1.4       matthew   458: 	my $tmpdir = '/home/httpd/perl/tmp/';
1.12      matthew   459: 	my $filename = $ENV{'user.name'}.'_'.$ENV{'user.domain'}.
1.56    ! albertel  460: 	    '_'.time.'_'.$$.$randnumber.'_plot.data';
1.4       matthew   461: 	## Write the plot description to the file
1.51      matthew   462: 	&write_gnuplot_file($tmpdir,$filename,$target);
1.54      matthew   463: 	$filename = &Apache::lonnet::escape($filename);
1.4       matthew   464: 	## return image tag for the plot
1.51      matthew   465: 	if ($target eq 'web') {
                    466: 	    $result .= <<"ENDIMAGE";
1.53      matthew   467: <img src    = "/cgi-bin/plot.gif?file=$filename&output=gif" 
1.16      matthew   468:      width  = "$plot{'width'}" 
                    469:      height = "$plot{'height'}"
                    470:      align  = "$plot{'align'}"
1.47      matthew   471:      alt    = "image should be /cgi-bin/plot.gif?$filename" />
1.12      matthew   472: ENDIMAGE
1.51      matthew   473:         } elsif ($target eq 'tex') {
1.53      matthew   474: 	    &Apache::lonnet::ssi('cgi-bin/plot.gif?file=$filename'.
                    475: 				 '&output=eps');
1.51      matthew   476: 	    $result = "$filename.eps";
                    477: 	}
1.20      matthew   478:     } elsif ($target eq 'edit') {
1.21      matthew   479: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   480:     }
1.1       matthew   481:     return $result;
                    482: }
1.2       matthew   483: 
1.45      matthew   484: 
                    485: ##--------------------------------------------------------------- xtics
                    486: sub start_xtics {
                    487:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    488:     my $result='';
1.51      matthew   489:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   490: 	&get_attributes(\%xtics,\%tic_defaults,$parstack,$safeeval,
                    491: 		    $tagstack->[-1]);
                    492:     } elsif ($target eq 'edit') {
                    493: 	$result .= &Apache::edit::tag_start($target,$token,'xtics');
                    494: 	$result .= &edit_attributes($target,$token,\%tic_defaults,
                    495: 				    \@tic_edit_order);
                    496:     } elsif ($target eq 'modified') {
                    497: 	my $constructtag=&Apache::edit::get_new_args
                    498: 	    ($token,$parstack,$safeeval,keys(%tic_defaults));
                    499: 	if ($constructtag) {
                    500: 	    $result = &Apache::edit::rebuild_tag($token);
                    501: 	}
                    502:     }
                    503:     return $result;
                    504: }
                    505: 
                    506: sub end_xtics {
                    507:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    508:     my $result = '';
1.51      matthew   509:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   510:     } elsif ($target eq 'edit') {
                    511: 	$result.=&Apache::edit::tag_end($target,$token);
                    512:     }
                    513:     return $result;
                    514: }
                    515: 
                    516: ##--------------------------------------------------------------- ytics
                    517: sub start_ytics {
                    518:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    519:     my $result='';
1.51      matthew   520:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   521: 	&get_attributes(\%ytics,\%tic_defaults,$parstack,$safeeval,
                    522: 		    $tagstack->[-1]);
                    523:     } elsif ($target eq 'edit') {
                    524: 	$result .= &Apache::edit::tag_start($target,$token,'ytics');
                    525: 	$result .= &edit_attributes($target,$token,\%tic_defaults,
                    526: 				    \@tic_edit_order);
                    527:     } elsif ($target eq 'modified') {
                    528: 	my $constructtag=&Apache::edit::get_new_args
                    529: 	    ($token,$parstack,$safeeval,keys(%tic_defaults));
                    530: 	if ($constructtag) {
                    531: 	    $result = &Apache::edit::rebuild_tag($token);
                    532: 	}
                    533:     }
                    534:     return $result;
                    535: }
                    536: 
                    537: sub end_ytics {
                    538:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    539:     my $result = '';
1.51      matthew   540:     if ($target eq 'web' || $target eq 'tex') {
1.45      matthew   541:     } elsif ($target eq 'edit') {
                    542: 	$result.=&Apache::edit::tag_end($target,$token);
                    543:     }
                    544:     return $result;
                    545: }
                    546: 
                    547: 
1.1       matthew   548: ##----------------------------------------------------------------- key
                    549: sub start_key {
                    550:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    551:     my $result='';
1.51      matthew   552:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   553: 	&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
1.11      matthew   554: 		    $tagstack->[-1]);
1.20      matthew   555:     } elsif ($target eq 'edit') {
1.25      matthew   556: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Key');
1.21      matthew   557: 	$result .= &edit_attributes($target,$token,\%key_defaults);
1.20      matthew   558:     } elsif ($target eq 'modified') {
                    559: 	my $constructtag=&Apache::edit::get_new_args
1.24      matthew   560: 	    ($token,$parstack,$safeeval,keys(%key_defaults));
1.20      matthew   561: 	if ($constructtag) {
                    562: 	    $result = &Apache::edit::rebuild_tag($token);
                    563: 	}
1.4       matthew   564:     }
1.1       matthew   565:     return $result;
                    566: }
                    567: 
                    568: sub end_key {
                    569:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    570:     my $result = '';
1.51      matthew   571:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   572:     } elsif ($target eq 'edit') {
1.21      matthew   573: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   574:     }
1.1       matthew   575:     return $result;
                    576: }
1.21      matthew   577: 
1.1       matthew   578: ##------------------------------------------------------------------- title
                    579: sub start_title {
                    580:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    581:     my $result='';
1.51      matthew   582:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   583: 	$title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
1.49      matthew   584: 	$title =~ s/\n/ /g;
1.32      matthew   585: 	if (length($title) > $max_str_len) {
                    586: 	    $title = substr($title,0,$max_str_len);
                    587: 	}
1.20      matthew   588:     } elsif ($target eq 'edit') {
1.25      matthew   589: 	$result.=&Apache::edit::tag_start($target,$token,'Plot Title');
1.22      matthew   590: 	my $text=&Apache::lonxml::get_all_text("/title",$$parser[-1]);
1.39      matthew   591: 	$result.=&Apache::edit::end_row().
                    592: 	    &Apache::edit::start_spanning_row().
1.30      matthew   593: 	    &Apache::edit::editfield('',$text,'',60,1);
1.20      matthew   594:     } elsif ($target eq 'modified') {
1.29      matthew   595: 	my $text=$$parser[-1]->get_text("/title");
1.42      matthew   596: 	$result.=&Apache::edit::rebuild_tag($token);
1.21      matthew   597: 	$result.=&Apache::edit::modifiedfield($token);
1.4       matthew   598:     }
1.1       matthew   599:     return $result;
                    600: }
                    601: 
                    602: sub end_title {
                    603:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    604:     my $result = '';
1.51      matthew   605:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   606:     } elsif ($target eq 'edit') {
1.27      matthew   607: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   608:     }
1.1       matthew   609:     return $result;
                    610: }
                    611: ##------------------------------------------------------------------- xlabel
                    612: sub start_xlabel {
                    613:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    614:     my $result='';
1.51      matthew   615:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   616: 	$xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
1.49      matthew   617: 	$xlabel =~ s/\n/ /g;
1.32      matthew   618: 	if (length($xlabel) > $max_str_len) {
                    619: 	    $xlabel = substr($xlabel,0,$max_str_len);
                    620: 	}
1.20      matthew   621:     } elsif ($target eq 'edit') {
1.25      matthew   622: 	$result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
1.22      matthew   623: 	my $text=&Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
1.39      matthew   624: 	$result.=&Apache::edit::end_row().
                    625: 	    &Apache::edit::start_spanning_row().
1.30      matthew   626: 	    &Apache::edit::editfield('',$text,'',60,1);
1.20      matthew   627:     } elsif ($target eq 'modified') {
1.29      matthew   628: 	my $text=$$parser[-1]->get_text("/xlabel");
1.42      matthew   629: 	$result.=&Apache::edit::rebuild_tag($token);	
1.21      matthew   630: 	$result.=&Apache::edit::modifiedfield($token);
1.4       matthew   631:     }
1.1       matthew   632:     return $result;
                    633: }
                    634: 
                    635: sub end_xlabel {
                    636:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    637:     my $result = '';
1.51      matthew   638:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   639:     } elsif ($target eq 'edit') {
1.27      matthew   640: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   641:     }
1.1       matthew   642:     return $result;
                    643: }
1.21      matthew   644: 
1.1       matthew   645: ##------------------------------------------------------------------- ylabel
                    646: sub start_ylabel {
                    647:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    648:     my $result='';
1.51      matthew   649:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   650: 	$ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
1.49      matthew   651: 	$ylabel =~ s/\n/ /g;
1.32      matthew   652: 	if (length($ylabel) > $max_str_len) {
                    653: 	    $ylabel = substr($ylabel,0,$max_str_len);
                    654: 	}
1.20      matthew   655:     } elsif ($target eq 'edit') {
1.25      matthew   656: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
1.22      matthew   657: 	my $text = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
1.39      matthew   658: 	$result .= &Apache::edit::end_row().
                    659: 	    &Apache::edit::start_spanning_row().
1.30      matthew   660: 	    &Apache::edit::editfield('',$text,'',60,1);
1.20      matthew   661:     } elsif ($target eq 'modified') {
1.29      matthew   662: 	my $text=$$parser[-1]->get_text("/ylabel");
1.42      matthew   663: 	$result.=&Apache::edit::rebuild_tag($token);
1.21      matthew   664: 	$result.=&Apache::edit::modifiedfield($token);
1.4       matthew   665:     }
1.1       matthew   666:     return $result;
                    667: }
                    668: 
                    669: sub end_ylabel {
                    670:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    671:     my $result = '';
1.51      matthew   672:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   673:     } elsif ($target eq 'edit') {
1.27      matthew   674: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   675:     }
1.1       matthew   676:     return $result;
                    677: }
1.21      matthew   678: 
1.1       matthew   679: ##------------------------------------------------------------------- label
                    680: sub start_label {
                    681:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    682:     my $result='';
1.51      matthew   683:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   684: 	my %label;
                    685: 	&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
1.11      matthew   686: 		    $tagstack->[-1]);
1.32      matthew   687: 	my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
1.49      matthew   688: 	$text =~ s/\n/ /g;
1.32      matthew   689: 	$text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
                    690: 	$label{'text'} = $text;
1.17      matthew   691: 	push(@labels,\%label);
1.20      matthew   692:     } elsif ($target eq 'edit') {
1.25      matthew   693: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Label');
1.21      matthew   694: 	$result .= &edit_attributes($target,$token,\%label_defaults);
1.22      matthew   695: 	my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
1.39      matthew   696: 	$result .= &Apache::edit::end_row().
                    697: 	    &Apache::edit::start_spanning_row().
1.30      matthew   698: 	    &Apache::edit::editfield('',$text,'',60,1);
1.20      matthew   699:     } elsif ($target eq 'modified') {
1.42      matthew   700: 	&Apache::edit::get_new_args
1.24      matthew   701: 	    ($token,$parstack,$safeeval,keys(%label_defaults));
1.42      matthew   702: 	$result.=&Apache::edit::rebuild_tag($token);
1.22      matthew   703: 	my $text=$$parser[-1]->get_text("/label");
1.21      matthew   704: 	$result.=&Apache::edit::modifiedfield($token);
1.4       matthew   705:     }
1.1       matthew   706:     return $result;
                    707: }
                    708: 
                    709: sub end_label {
                    710:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    711:     my $result = '';
1.51      matthew   712:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   713:     } elsif ($target eq 'edit') {
1.21      matthew   714: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   715:     }
1.1       matthew   716:     return $result;
                    717: }
                    718: 
                    719: ##------------------------------------------------------------------- curve
                    720: sub start_curve {
                    721:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    722:     my $result='';
1.25      matthew   723:     &Apache::lonxml::register('Apache::lonplot',('function','data'));
                    724:     push (@Apache::lonxml::namespace,'curve');
1.51      matthew   725:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   726: 	my %curve;
                    727: 	&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
1.11      matthew   728: 		    $tagstack->[-1]);
1.17      matthew   729: 	push (@curves,\%curve);
1.20      matthew   730:     } elsif ($target eq 'edit') {
1.26      matthew   731: 	$result .= &Apache::edit::tag_start($target,$token,'Curve');
1.48      matthew   732: 	$result .= &help_win($curve_help_text);
1.21      matthew   733: 	$result .= &edit_attributes($target,$token,\%curve_defaults);
1.20      matthew   734:     } elsif ($target eq 'modified') {
                    735: 	my $constructtag=&Apache::edit::get_new_args
1.35      matthew   736: 	    ($token,$parstack,$safeeval,keys(%curve_defaults));
1.20      matthew   737: 	if ($constructtag) {
                    738: 	    $result = &Apache::edit::rebuild_tag($token);
                    739: 	    $result.= &Apache::edit::handle_insert();
                    740: 	}
1.4       matthew   741:     }
1.1       matthew   742:     return $result;
                    743: }
                    744: 
                    745: sub end_curve {
                    746:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    747:     my $result = '';
1.25      matthew   748:     pop @Apache::lonxml::namespace;
                    749:     &Apache::lonxml::deregister('Apache::lonplot',('function','data'));
1.51      matthew   750:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   751:     } elsif ($target eq 'edit') {
1.21      matthew   752: 	$result.=&Apache::edit::tag_end($target,$token);
1.4       matthew   753:     }
1.1       matthew   754:     return $result;
                    755: }
1.21      matthew   756: 
1.1       matthew   757: ##------------------------------------------------------------ curve function
                    758: sub start_function {
                    759:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    760:     my $result='';
1.51      matthew   761:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   762: 	if (exists($curves[-1]->{'data'})) {
                    763: 	    &Apache::lonxml::warning('Use of <function> precludes use of <data>.  The <data> will be omitted in favor of the <function> declaration.');
                    764: 	    delete $curves[-1]->{'data'} ;
                    765: 	}
                    766: 	$curves[-1]->{'function'} = 
                    767: 	    &Apache::lonxml::get_all_text("/function",$$parser[-1]);
1.20      matthew   768:     } elsif ($target eq 'edit') {
1.37      matthew   769: 	$result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
1.22      matthew   770: 	my $text = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
1.39      matthew   771: 	$result .= &Apache::edit::end_row().
                    772: 	    &Apache::edit::start_spanning_row().
1.30      matthew   773: 	    &Apache::edit::editfield('',$text,'',60,1);
1.20      matthew   774:     } elsif ($target eq 'modified') {
1.42      matthew   775: 	$result.=&Apache::edit::rebuild_tag($token);
1.20      matthew   776: 	my $text=$$parser[-1]->get_text("/function");
                    777: 	$result.=&Apache::edit::modifiedfield($token);
1.4       matthew   778:     }
1.1       matthew   779:     return $result;
                    780: }
                    781: 
                    782: sub end_function {
                    783:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    784:     my $result = '';
1.51      matthew   785:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   786:     } elsif ($target eq 'edit') {
1.26      matthew   787: 	$result .= &Apache::edit::end_table();
1.4       matthew   788:     }
1.1       matthew   789:     return $result;
                    790: }
1.21      matthew   791: 
1.1       matthew   792: ##------------------------------------------------------------ curve  data
                    793: sub start_data {
                    794:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    795:     my $result='';
1.51      matthew   796:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   797: 	if (exists($curves[-1]->{'function'})) {
                    798: 	    &Apache::lonxml::warning('Use of <data> precludes use of .'.
                    799: 	    '<function>.  The <function> will be omitted in favor of '.
                    800:             'the <data> declaration.');
                    801: 	    delete($curves[-1]->{'function'});
                    802: 	}
                    803: 	my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
1.40      matthew   804: 	# Deal with cases where we're given an array...
                    805: 	if ($datatext =~ /^\@/) {
                    806: 	    $datatext = &Apache::run::run('return "'.$datatext.'"',
                    807: 					  $safeeval,1);
                    808: 	}
1.49      matthew   809: 	$datatext =~ s/\s+/ /g;
1.17      matthew   810: 	# Need to do some error checking on the @data array - 
                    811: 	# make sure it's all numbers and make sure each array 
                    812: 	# is of the same length.
                    813: 	my @data;
1.35      matthew   814: 	if ($datatext =~ /,/) { # comma deliminated
1.17      matthew   815: 	    @data = split /,/,$datatext;
                    816: 	} else { # Assume it's space seperated.
                    817: 	    @data = split / /,$datatext;
                    818: 	}
                    819: 	for (my $i=0;$i<=$#data;$i++) {
                    820: 	    # Check that it's non-empty
1.19      matthew   821: 	    if (! defined($data[$i])) {
                    822: 		&Apache::lonxml::warning(
                    823: 		    'undefined <data> value.  Replacing with '.
                    824: 		    ' pi/e = 1.15572734979092');
                    825: 		$data[$i] = 1.15572734979092;
                    826: 	    }
1.17      matthew   827: 	    # Check that it's a number
1.19      matthew   828: 	    if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
                    829: 		&Apache::lonxml::warning(
                    830: 		    'Bad <data> value of '.$data[$i].'  Replacing with '.
                    831: 		    ' pi/e = 1.15572734979092');
                    832: 		$data[$i] = 1.15572734979092;
                    833: 	    }
1.17      matthew   834: 	}
1.35      matthew   835: 	# complain if the number of data points is not the same as
                    836: 	# in previous sets of data.
1.36      matthew   837: 	if (($curves[-1]->{'data'}) && ($#data != $#{@{$curves[-1]->{'data'}->[0]}})){
1.35      matthew   838: 	    &Apache::lonxml::warning
                    839: 		('Number of data points is not consistent with previous '.
                    840: 		 'number of data points');
                    841: 	}
1.17      matthew   842: 	push  @{$curves[-1]->{'data'}},\@data;
1.20      matthew   843:     } elsif ($target eq 'edit') {
1.37      matthew   844: 	$result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
1.22      matthew   845: 	my $text = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
1.39      matthew   846: 	$result .= &Apache::edit::end_row().
                    847: 	    &Apache::edit::start_spanning_row().
1.30      matthew   848: 	    &Apache::edit::editfield('',$text,'',60,1);
1.20      matthew   849:     } elsif ($target eq 'modified') {
1.42      matthew   850: 	$result.=&Apache::edit::rebuild_tag($token);
1.21      matthew   851: 	my $text=$$parser[-1]->get_text("/data");
                    852: 	$result.=&Apache::edit::modifiedfield($token);
1.4       matthew   853:     }
1.1       matthew   854:     return $result;
                    855: }
                    856: 
                    857: sub end_data {
                    858:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    859:     my $result = '';
1.51      matthew   860:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   861:     } elsif ($target eq 'edit') {
1.26      matthew   862: 	$result .= &Apache::edit::end_table();
1.4       matthew   863:     }
1.1       matthew   864:     return $result;
                    865: }
                    866: 
                    867: ##------------------------------------------------------------------- axis
                    868: sub start_axis {
                    869:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    870:     my $result='';
1.51      matthew   871:     if ($target eq 'web' || $target eq 'tex') {
1.17      matthew   872: 	&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
                    873: 			$tagstack->[-1]);
1.20      matthew   874:     } elsif ($target eq 'edit') {
1.25      matthew   875: 	$result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
1.21      matthew   876: 	$result .= &edit_attributes($target,$token,\%axis_defaults);
1.20      matthew   877:     } elsif ($target eq 'modified') {
1.29      matthew   878: 	my $constructtag=&Apache::edit::get_new_args
                    879: 	    ($token,$parstack,$safeeval,keys(%axis_defaults));
                    880: 	if ($constructtag) {
                    881: 	    $result = &Apache::edit::rebuild_tag($token);
                    882: 	}
1.4       matthew   883:     }
1.1       matthew   884:     return $result;
                    885: }
                    886: 
                    887: sub end_axis {
                    888:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    889:     my $result = '';
1.51      matthew   890:     if ($target eq 'web' || $target eq 'tex') {
1.20      matthew   891:     } elsif ($target eq 'edit') {
1.21      matthew   892: 	$result.=&Apache::edit::tag_end($target,$token);
1.20      matthew   893:     } elsif ($target eq 'modified') {
1.4       matthew   894:     }
1.1       matthew   895:     return $result;
                    896: }
                    897: 
1.21      matthew   898: ###################################################################
                    899: ##                                                               ##
                    900: ##        Utility Functions                                      ##
                    901: ##                                                               ##
                    902: ###################################################################
                    903: 
1.13      matthew   904: ##----------------------------------------------------------- set_defaults
                    905: sub set_defaults {
1.21      matthew   906:     my ($var,$defaults) = @_;
1.13      matthew   907:     my $key;
1.24      matthew   908:     foreach $key (keys(%$defaults)) {
1.13      matthew   909: 	$var->{$key} = $defaults->{$key}->{'default'};
                    910:     }
                    911: }
                    912: 
1.1       matthew   913: ##------------------------------------------------------------------- misc
1.2       matthew   914: sub get_attributes{
1.21      matthew   915:     my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
1.24      matthew   916:     foreach my $attr (keys(%{$defaults})) {
1.10      matthew   917: 	$values->{$attr} = 
1.15      matthew   918: 	    &Apache::lonxml::get_param($attr,$parstack,$safeeval);
1.10      matthew   919: 	if ($values->{$attr} eq '' | !defined($values->{$attr})) {
1.11      matthew   920: 	    $values->{$attr} = $defaults->{$attr}->{'default'};
1.6       matthew   921: 	    next;
                    922: 	}
1.10      matthew   923: 	my $test = $defaults->{$attr}->{'test'};
                    924: 	if (! &$test($values->{$attr})) {
1.6       matthew   925: 	    &Apache::lonxml::warning
                    926: 		($tag.':'.$attr.': Bad value.'.'Replacing your value with : '
1.11      matthew   927: 		 .$defaults->{$attr}->{'default'} );
                    928: 	    $values->{$attr} = $defaults->{$attr}->{'default'};
1.10      matthew   929: 	}
1.2       matthew   930:     }
1.11      matthew   931:     return ;
1.6       matthew   932: }
1.40      matthew   933: 
1.15      matthew   934: ##------------------------------------------------------- write_gnuplot_file
1.6       matthew   935: sub write_gnuplot_file {
1.51      matthew   936:     my ($tmpdir,$filename,$target)= @_;
1.6       matthew   937:     my $gnuplot_input = '';
1.10      matthew   938:     my $curve;
1.6       matthew   939:     # Collect all the colors
                    940:     my @Colors;
                    941:     push @Colors, $plot{'bgcolor'};
                    942:     push @Colors, $plot{'fgcolor'}; 
1.13      matthew   943:     push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
1.9       matthew   944:     foreach $curve (@curves) {
                    945: 	push @Colors, ($curve->{'color'} ne '' ? 
                    946: 		       $curve->{'color'}       : 
1.13      matthew   947: 		       $plot{'fgcolor'}        );
1.6       matthew   948:     }
                    949:     # set term
1.51      matthew   950:     if ($target eq 'web') {
                    951: 	$gnuplot_input .= 'set term gif ';
                    952: 	$gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');
                    953: 	$gnuplot_input .= $plot{'font'} . ' ';
                    954: 	$gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';
                    955: 	$gnuplot_input .= "@Colors\n";
                    956: 	# set output
                    957: 	$gnuplot_input .= "set output\n";
                    958:     } elsif ($target eq 'tex') {
                    959: 	$gnuplot_input .= "set term postscript eps monochrome\n";
                    960: 	$gnuplot_input .= "set output \"$filename.eps\"\n";
                    961:     }
1.7       matthew   962:     # grid
1.10      matthew   963:     $gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');
1.7       matthew   964:     # border
1.9       matthew   965:     $gnuplot_input .= ($plot{'border'} eq 'on'?
                    966: 		       'set border'.$/           :
                    967: 		       'set noborder'.$/         );    # title, xlabel, ylabel
1.45      matthew   968:     # titles
1.13      matthew   969:     $gnuplot_input .= "set title  \"$title\"\n"  if (defined($title)) ;
                    970:     $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
                    971:     $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
1.45      matthew   972:     # tics
                    973:     if (%xtics) {    
                    974: 	$gnuplot_input .= "set xtics $xtics{'location'} ";
1.46      matthew   975: 	$gnuplot_input .= ( $xtics{'mirror'} eq 'on'?"mirror ":"nomirror ");
1.45      matthew   976: 	$gnuplot_input .= "$xtics{'start'}, ";
                    977: 	$gnuplot_input .= "$xtics{'increment'}, ";
                    978: 	$gnuplot_input .= "$xtics{'end'}\n";
                    979:     }
                    980:     if (%ytics) {    
                    981: 	$gnuplot_input .= "set ytics $ytics{'location'} ";
1.46      matthew   982: 	$gnuplot_input .= ( $ytics{'mirror'} eq 'on'?"mirror ":"nomirror ");
1.45      matthew   983: 	$gnuplot_input .= "$ytics{'start'}, ";
                    984: 	$gnuplot_input .= "$ytics{'increment'}, ";
                    985:         $gnuplot_input .= "$ytics{'end'}\n";
                    986:     }
                    987:     # axis
1.23      matthew   988:     if (%axis) {
1.13      matthew   989: 	$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
                    990: 	$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
1.6       matthew   991:     }
                    992:     # Key
1.23      matthew   993:     if (%key) {
1.9       matthew   994: 	$gnuplot_input .= 'set key '.$key{'pos'}.' ';
                    995: 	if ($key{'title'} ne '') {
1.43      matthew   996: 	    $gnuplot_input .= 'title " '.$key{'title'}.'" ';
1.11      matthew   997: 	} 
                    998: 	$gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
1.6       matthew   999:     } else {
1.9       matthew  1000: 	$gnuplot_input .= 'set nokey'.$/;
1.13      matthew  1001:     }
1.6       matthew  1002:     # labels
1.10      matthew  1003:     my $label;
1.6       matthew  1004:     foreach $label (@labels) {
                   1005: 	$gnuplot_input .= 'set label "'.$label->{'text'}.'" at '.
1.9       matthew  1006: 	    $label->{'xpos'}.','.$label->{'ypos'}.' '.$label->{'justify'}.$/ ;
1.6       matthew  1007:     }
                   1008:     # curves
                   1009:     $gnuplot_input .= 'plot ';
1.9       matthew  1010:     for (my $i = 0;$i<=$#curves;$i++) {
                   1011: 	$curve = $curves[$i];
                   1012: 	$gnuplot_input.= ', ' if ($i > 0);
1.6       matthew  1013: 	if (exists($curve->{'function'})) {
1.9       matthew  1014: 	    $gnuplot_input.= 
                   1015: 		$curve->{'function'}.' title "'.
                   1016: 		$curve->{'name'}.'" with '.
                   1017: 		$curve->{'linestyle'};
1.6       matthew  1018: 	} elsif (exists($curve->{'data'})) {
1.40      matthew  1019: 	    # Store data values in $datatext
                   1020: 	    my $datatext = '';
                   1021: 	    #   get new filename
                   1022: 	    my $datafilename = "$tmpdir/$filename.$i";
                   1023: 	    my $fh=Apache::File->new(">$datafilename");
                   1024: 	    # Compile data
1.6       matthew  1025: 	    my @Data = @{$curve->{'data'}};
1.9       matthew  1026: 	    my @Data0 = @{$Data[0]};
                   1027: 	    for (my $i =0; $i<=$#Data0; $i++) {
1.10      matthew  1028: 		my $dataset;
1.6       matthew  1029: 		foreach $dataset (@Data) {
1.9       matthew  1030: 		    $datatext .= $dataset->[$i] . ' ';
1.6       matthew  1031: 		}
1.9       matthew  1032: 		$datatext .= $/;
1.6       matthew  1033: 	    }
1.40      matthew  1034: 	    #   write file
                   1035: 	    print $fh $datatext;
                   1036: 	    close ($fh);
                   1037: 	    #   generate gnuplot text
                   1038: 	    $gnuplot_input.= '"'.$datafilename.'" title "'.
                   1039: 		$curve->{'name'}.'" with '.
                   1040: 		$curve->{'linestyle'};
1.6       matthew  1041: 	}
                   1042:     }
1.40      matthew  1043:     # Write the output to a file.
                   1044:     my $fh=Apache::File->new(">$tmpdir$filename");
                   1045:     print $fh $gnuplot_input;
                   1046:     close($fh);
                   1047:     # That's all folks.
                   1048:     return ;
1.2       matthew  1049: }
1.21      matthew  1050: 
                   1051: #---------------------------------------------- check_inputs
                   1052: sub check_inputs {
                   1053:     ## Note: no inputs, no outputs - this acts only on global variables.
                   1054:     ## Make sure we have all the input we need:
1.47      matthew  1055:     if (! %plot) { &set_defaults(\%plot,\%gnuplot_defaults); }
1.23      matthew  1056:     if (! %key ) {} # No key for this plot, thats okay
1.34      matthew  1057: #    if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
1.21      matthew  1058:     if (! defined($title )) {} # No title for this plot, thats okay
                   1059:     if (! defined($xlabel)) {} # No xlabel for this plot, thats okay
                   1060:     if (! defined($ylabel)) {} # No ylabel for this plot, thats okay
                   1061:     if ($#labels < 0) { }      # No labels for this plot, thats okay
                   1062:     if ($#curves < 0) { 
                   1063: 	&Apache::lonxml::warning("No curves specified for plot!!!!");
                   1064: 	return '';
                   1065:     }
                   1066:     my $curve;
                   1067:     foreach $curve (@curves) {
                   1068: 	if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
                   1069: 	    &Apache::lonxml::warning("One of the curves specified did not contain any <data> or <function> declarations\n");
                   1070: 	    return '';
                   1071: 	}
                   1072:     }
                   1073: }
                   1074: 
1.20      matthew  1075: #------------------------------------------------ make_edit
                   1076: sub edit_attributes {
1.34      matthew  1077:     my ($target,$token,$defaults,$keys) = @_;
                   1078:     my ($result,@keys);
                   1079:     if ($keys && ref($keys) eq 'ARRAY') {
                   1080:         @keys = @$keys;
                   1081:     } else {
                   1082: 	@keys = sort(keys(%$defaults));
                   1083:     }
                   1084:     foreach my $attr (@keys) {
1.35      matthew  1085: 	# append a ' ' to the description if it doesn't have one already.
                   1086: 	my $description = $defaults->{$attr}->{'description'};
                   1087: 	$description .= ' ' if ($description !~ / $/);
1.20      matthew  1088: 	if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
1.35      matthew  1089: 	    $result .= &Apache::edit::text_arg
1.38      matthew  1090: 		($description,$attr,$token,
                   1091: 		 $defaults->{$attr}->{'size'});
1.20      matthew  1092: 	} elsif ($defaults->{$attr}->{'edit_type'} eq 'choice') {
1.35      matthew  1093: 	    $result .= &Apache::edit::select_arg
                   1094: 		($description,$attr,$defaults->{$attr}->{'choices'},$token);
1.45      matthew  1095: 	} elsif ($defaults->{$attr}->{'edit_type'} eq 'onoff') {
1.35      matthew  1096: 	    $result .= &Apache::edit::select_arg
                   1097: 		($description,$attr,['on','off'],$token);
1.20      matthew  1098: 	}
1.25      matthew  1099: 	$result .= '<br />';
1.20      matthew  1100:     }
                   1101:     return $result;
                   1102: }
1.1       matthew  1103: 
1.21      matthew  1104: 
                   1105: ###################################################################
                   1106: ##                                                               ##
                   1107: ##           Insertion functions for editing plots               ##
                   1108: ##                                                               ##
                   1109: ###################################################################
                   1110: 
1.47      matthew  1111: sub insert_gnuplot {
1.29      matthew  1112:     my $result = '';
1.20      matthew  1113:     #  plot attributes
1.50      matthew  1114:     $result .= "<gnuplot \n";
1.47      matthew  1115:     foreach my $attr (keys(%gnuplot_defaults)) {
                   1116: 	$result .= "     $attr=\"$gnuplot_defaults{$attr}->{'default'}\"\n";
1.20      matthew  1117:     }
                   1118:     $result .= ">\n";
1.47      matthew  1119:     # Add the components (most are commented out for simplicity)
1.44      matthew  1120:     # $result .= &insert_key();
                   1121:     # $result .= &insert_axis();
                   1122:     # $result .= &insert_title();    
                   1123:     # $result .= &insert_xlabel();    
                   1124:     # $result .= &insert_ylabel();    
1.20      matthew  1125:     $result .= &insert_curve();
1.50      matthew  1126:     # close up the <gnuplot>
                   1127:     $result .= "</gnuplot>\n";
1.45      matthew  1128:     return $result;
                   1129: }
                   1130: 
1.46      matthew  1131: sub insert_tics {
                   1132:     my $result;
                   1133:     $result .= &insert_xtics() . &insert_ytics;
                   1134:     return $result;
                   1135: }
                   1136: 
1.45      matthew  1137: sub insert_xtics {
                   1138:     my $result;
1.46      matthew  1139:     $result .= "\n    <xtics ";
1.45      matthew  1140:     foreach my $attr (keys(%tic_defaults)) {
1.46      matthew  1141: 	$result .= "$attr=\"$tic_defaults{$attr}->{'default'}\" ";
1.45      matthew  1142:     }
1.46      matthew  1143:     $result .= "/>\n";
1.45      matthew  1144:     return $result;
                   1145: }
                   1146: 
                   1147: sub insert_ytics {
                   1148:     my $result;
1.46      matthew  1149:     $result .= "\n    <ytics ";
1.45      matthew  1150:     foreach my $attr (keys(%tic_defaults)) {
1.46      matthew  1151: 	$result .= "$attr=\"$tic_defaults{$attr}->{'default'}\" ";
1.45      matthew  1152:     }
1.46      matthew  1153:     $result .= "/>\n";
1.20      matthew  1154:     return $result;
                   1155: }
                   1156: 
                   1157: sub insert_key {
                   1158:     my $result;
1.46      matthew  1159:     $result .= "\n    <key \n";
1.30      matthew  1160:     foreach my $attr (keys(%key_defaults)) {
1.29      matthew  1161: 	$result .= "         $attr=\"$key_defaults{$attr}->{'default'}\"\n";
1.20      matthew  1162:     }
                   1163:     $result .= "   />\n";
                   1164:     return $result;
                   1165: }
                   1166: 
                   1167: sub insert_axis{
                   1168:     my $result;
1.46      matthew  1169:     $result .= "\n    <axis ";
1.30      matthew  1170:    foreach my $attr (keys(%axis_defaults)) {
1.29      matthew  1171: 	$result .= "         $attr=\"$axis_defaults{$attr}->{'default'}\"\n";
1.20      matthew  1172:     }
                   1173:     $result .= "   />\n";
                   1174:     return $result;
                   1175: }
1.28      matthew  1176: 
1.46      matthew  1177: sub insert_title { return "\n    <title></title>\n"; }
                   1178: sub insert_xlabel { return "\n    <xlabel></xlabel>\n"; }
                   1179: sub insert_ylabel { return "\n    <ylabel></ylabel>\n"; }
1.20      matthew  1180: 
                   1181: sub insert_label {
                   1182:     my $result;
1.46      matthew  1183:     $result .= "\n    <label ";
1.30      matthew  1184:     foreach my $attr (keys(%label_defaults)) {
1.27      matthew  1185: 	$result .= '         '.$attr.'="'.
1.20      matthew  1186: 	    $label_defaults{$attr}->{'default'}."\"\n";
                   1187:     }
                   1188:     $result .= "   ></label>\n";
                   1189:     return $result;
                   1190: }
                   1191: 
                   1192: sub insert_curve {
                   1193:     my $result;
1.41      matthew  1194:     $result .= "\n    <curve ";
1.30      matthew  1195:     foreach my $attr (keys(%curve_defaults)) {
1.27      matthew  1196: 	$result .= '         '.$attr.'="'.
1.20      matthew  1197: 	    $curve_defaults{$attr}->{'default'}."\"\n";
                   1198:     }
1.41      matthew  1199:     $result .= "    >\n";
                   1200:     $result .= &insert_data().&insert_data()."</curve>\n";
1.20      matthew  1201: }
1.4       matthew  1202: 
1.20      matthew  1203: sub insert_function {
                   1204:     my $result;
                   1205:     $result .= "<function></function>\n";
                   1206:     return $result;
                   1207: }
1.4       matthew  1208: 
1.20      matthew  1209: sub insert_data {
                   1210:     my $result;
                   1211:     $result .= "     <data></data>\n";
                   1212:     return $result;
                   1213: }
1.4       matthew  1214: 
1.48      matthew  1215: ##----------------------------------------------------------------------
                   1216: # Javascript functions to display help for tags
                   1217: 
                   1218: sub make_javascript {
                   1219:     my $helpwindowwidth  = 400;
                   1220:     my $helpwindowheight = 400;
                   1221:     my $result = '';
                   1222:     $result.=<<"ENDFUNCTION";
                   1223: <script language="JavaScript">
                   1224: function openWin(text)
                   1225: {
                   1226:   newWin = open("", "new_W", "width=$helpwindowwidth,height=$helpwindowheight,resizable=1,scrollbars=1");
                   1227:   newWin.document.open("text/html", "replace");
                   1228:   newWin.document.writeln(text);
                   1229:   newWin.document.writeln('<center><a href=\"javascript:window.close()\">close this window</a></center>');
                   1230:   newWin.document.close();
                   1231: }
                   1232: </script>
                   1233: ENDFUNCTION
                   1234:     return $result;
                   1235: }
                   1236: 
                   1237: sub help_win {
                   1238:     my ($helptext)=@_;
                   1239:     $helptext =~ s/\n/ /g;
                   1240:     $helptext =~ s/\'/\\\'/g;
                   1241:     my $result = '';
                   1242:     $result.=<<"ENDWIN";
                   1243: <table width="100%"><tr><td align="right">
                   1244: <a href="javascript:openWin('$helptext')">help</a>
                   1245: </td></tr></table><hr />
                   1246: ENDWIN
                   1247:     return $result;
                   1248: }
1.21      matthew  1249: ##----------------------------------------------------------------------
1.20      matthew  1250: 1;
                   1251: __END__
1.4       matthew  1252: 
                   1253: 

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