# The LearningOnline Network with CAPA
# Dynamic plot
#
# $Id: lonplot.pm,v 1.117 2007/05/23 22:36:28 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
package Apache::lonplot;
use strict;
use warnings FATAL=>'all';
no warnings 'uninitialized';
use Apache::File;
use Apache::response;
use Apache::lonxml;
use Apache::edit;
use Apache::lonnet;
use lib '/home/httpd/lib/perl/';
use LONCAPA;
use vars qw/$weboutputformat $versionstring/;
BEGIN {
&Apache::lonxml::register('Apache::lonplot',('gnuplot'));
#
# Determine the version of GNUPLOT
$weboutputformat = 'gif';
$versionstring = `gnuplot --version 2>/dev/null`;
if ($versionstring =~ /^gnuplot 4/) {
$weboutputformat = 'png';
}
}
##
## Description of data structures:
##
## %plot %key %axis
## --------------------------
## height title color
## width box xmin
## bgcolor pos xmax
## fgcolor ymin
## transparent ymax
## grid
## border
## font
## align
##
## @labels: $labels[$i] = \%label
## %label: text, xpos, ypos, justify
##
## @curves: $curves[$i] = \%curve
## %curve: name, linestyle, ( function | data )
##
## $curves[$i]->{'data'} = [ [x1,x2,x3,x4],
## [y1,y2,y3,y4] ]
##
###################################################################
## ##
## Tests used in checking the validitity of input ##
## ##
###################################################################
my $max_str_len = 50; # if a label, title, xlabel, or ylabel text
# is longer than this, it will be truncated.
my %linestyles =
(
lines => 2, # Maybe this will be used in the future
linespoints => 2, # to check on whether or not they have
dots => 2, # supplied enough <data></data> fields
points => 2, # to use the given line style. But for
steps => 2, # now there are more important things
fsteps => 2, # for me to deal with.
histeps => 2,
errorbars => 3,
xerrorbars => [3,4],
yerrorbars => [3,4],
xyerrorbars => [4,6],
boxes => 3,
filledcurves => 2,
vector => 4
);
my $int_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
my $real_test =
sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d*\.?\d*([eE][+-]\d+)?$/};
my $pos_real_test =
sub {$_[0]=~s/\s+//g;$_[0]=~/^[+]?\d*\.?\d*([eE][+-]\d+)?$/};
my $color_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-fA-F]{6}$/};
my $onoff_test = sub {$_[0]=~/^(on|off)$/};
my $key_pos_test = sub {$_[0]=~/^(top|bottom|right|left|outside|below| )+$/};
my $sml_test = sub {$_[0]=~/^(small|medium|large)$/};
my $linestyle_test = sub {exists($linestyles{$_[0]})};
my $words_test = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w~!\@\#\$\%^&\*\(\)-=_\+\[\]\{\}:\;\'<>,\.\/\?\\]+ ?)+$/};
###################################################################
## ##
## Attribute metadata ##
## ##
###################################################################
my @gnuplot_edit_order =
qw/alttag bgcolor fgcolor height width font transparent grid samples
border align texwidth texfont plotcolor plottype gridtype lmargin rmargin
tmargin bmargin major_ticscale minor_ticscale boxwidth gridlayer fillstyle
pattern solid/;
my $margin_choices = ['default',0..20];
my %gnuplot_defaults =
(
alttag => {
default => 'dynamically generated plot',
test => $words_test,
description => 'brief description of the plot',
edit_type => 'entry',
size => '40'
},
height => {
default => 300,
test => $int_test,
description => 'height of image (pixels)',
edit_type => 'entry',
size => '10'
},
width => {
default => 400,
test => $int_test,
description => 'width of image (pixels)',
edit_type => 'entry',
size => '10'
},
bgcolor => {
default => 'xffffff',
test => $color_test,
description => 'background color of image (xffffff)',
edit_type => 'entry',
size => '10'
},
fgcolor => {
default => 'x000000',
test => $color_test,
description => 'foreground color of image (x000000)',
edit_type => 'entry',
size => '10'
},
transparent => {
default => 'off',
test => $onoff_test,
description => 'Transparent image',
edit_type => 'onoff'
},
grid => {
default => 'on',
test => $onoff_test,
description => 'Display grid',
edit_type => 'onoff'
},
gridlayer => {
default => 'off',
test => $onoff_test,
description => 'Display grid front layer over filled boxes or filled curves',
edit_type => 'onoff'
},
box_border => {
default => 'noborder',
test => sub {$_[0]=~/^(noborder|border)$/},
description => 'Draw border for boxes',
edit_type => 'choice',
choices => ['border','noborder']
},
border => {
default => 'on',
test => $onoff_test,
description => 'Draw border around plot',
edit_type => 'onoff'
},
font => {
default => 'medium',
test => $sml_test,
description => 'Size of font to use',
edit_type => 'choice',
choices => ['small','medium','large']
},
samples => {
default => '100',
test => $int_test,
description => 'Number of samples for non-data plots',
edit_type => 'choice',
choices => ['100','200','500','1000','2000','5000']
},
align => {
default => 'middle',
test => sub {$_[0]=~/^(left|right|middle|center)$/},
description => 'alignment for image in html',
edit_type => 'choice',
choices => ['left','right','middle']
},
texwidth => {
default => '93',
test => $int_test,
description => 'Width of plot when printed (mm)',
edit_type => 'entry',
size => '5'
},
texfont => {
default => '22',
test => $int_test,
description => 'Font size to use in TeX output (pts):',
edit_type => 'choice',
choices => [qw/8 10 12 14 16 18 20 22 24 26 28 30 32 34 36/],
},
plotcolor => {
default => 'monochrome',
test => sub {$_[0]=~/^(monochrome|color|colour)$/},
description => 'Color setting for printing:',
edit_type => 'choice',
choices => [qw/monochrome color colour/],
},
pattern => {
default => '',
test => $int_test,
description => 'pattern value for boxes:',
edit_type => 'choice',
choices => [0,1,2,3,4,5,6]
},
solid => {
default => 0,
test => $real_test,
description => 'The density of fill style for boxes',
edit_type => 'entry',
size => '5'
},
fillstyle => {
default => 'empty',
test => sub {$_[0]=~/^(empty|solid|pattern)$/},
description => 'Filled style for boxes:',
edit_type => 'choice',
choices => ['empty','solid','pattern']
},
plottype => {
default => 'Cartesian',
test => sub {$_[0]=~/^(Polar|Cartesian)$/},
description => 'Plot type:',
edit_type => 'choice',
choices => ['Cartesian','Polar']
},
gridtype => {
default => 'Cartesian',
test => sub {$_[0]=~/^(Polar|Cartesian)$/},
description => 'Grid type:',
edit_type => 'choice',
choices => ['Cartesian','Polar']
},
lmargin => {
default => 'default',
test => sub {$_[0]=~/^(default|\d+)$/},
description => 'Left margin width (pts):',
edit_type => 'choice',
choices => $margin_choices,
},
rmargin => {
default => 'default',
test => sub {$_[0]=~/^(default|\d+)$/},
description => 'Right margin width (pts):',
edit_type => 'choice',
choices => $margin_choices,
},
tmargin => {
default => 'default',
test => sub {$_[0]=~/^(default|\d+)$/},
description => 'Top margin width (pts):',
edit_type => 'choice',
choices => $margin_choices,
},
bmargin => {
default => 'default',
test => sub {$_[0]=~/^(default|\d+)$/},
description => 'Bottom margin width (pts):',
edit_type => 'choice',
choices => $margin_choices,
},
boxwidth => {
default => '',
test => $real_test,
description => 'width of boxes default auto',
edit_type => 'entry',
size => '5'
},
major_ticscale => {
default => '1',
test => $real_test,
description => 'Size of major tic marks (plot coordinates)',
edit_type => 'entry',
size => '5'
},
minor_ticscale => {
default => '0.5',
test => $real_test,
description => 'Size of minor tic mark (plot coordinates)',
edit_type => 'entry',
size => '5'
},
);
my %key_defaults =
(
title => {
default => '',
test => $words_test,
description => 'Title of key',
edit_type => 'entry',
size => '40'
},
box => {
default => 'off',
test => $onoff_test,
description => 'Draw a box around the key?',
edit_type => 'onoff'
},
pos => {
default => 'top right',
test => $key_pos_test,
description => 'position of the key on the plot',
edit_type => 'choice',
choices => ['top left','top right','bottom left','bottom right',
'outside','below']
}
);
my %label_defaults =
(
xpos => {
default => 0,
test => $real_test,
description => 'x position of label (graph coordinates)',
edit_type => 'entry',
size => '10'
},
ypos => {
default => 0,
test => $real_test,
description => 'y position of label (graph coordinates)',
edit_type => 'entry',
size => '10'
},
justify => {
default => 'left',
test => sub {$_[0]=~/^(left|right|center)$/},
description => 'justification of the label text on the plot',
edit_type => 'choice',
choices => ['left','right','center']
}
);
my @tic_edit_order = ('location','mirror','start','increment','end',
'minorfreq');
my %tic_defaults =
(
location => {
default => 'border',
test => sub {$_[0]=~/^(border|axis)$/},
description => 'Location of major tic marks',
edit_type => 'choice',
choices => ['border','axis']
},
mirror => {
default => 'on',
test => $onoff_test,
description => 'mirror tics on opposite axis?',
edit_type => 'onoff'
},
start => {
default => '-10.0',
test => $real_test,
description => 'Start major tics at',
edit_type => 'entry',
size => '10'
},
increment => {
default => '1.0',
test => $real_test,
description => 'Place a major tic every',
edit_type => 'entry',
size => '10'
},
end => {
default => ' 10.0',
test => $real_test,
description => 'Stop major tics at ',
edit_type => 'entry',
size => '10'
},
minorfreq => {
default => '0',
test => $int_test,
description => 'Number of minor tics per major tic mark',
edit_type => 'entry',
size => '10'
},
);
my @axis_edit_order = ('color','xmin','xmax','ymin','ymax');
my %axis_defaults =
(
color => {
default => 'x000000',
test => $color_test,
description => 'color of grid lines (x000000)',
edit_type => 'entry',
size => '10'
},
xmin => {
default => '-10.0',
test => $real_test,
description => 'minimum x-value shown in plot',
edit_type => 'entry',
size => '10'
},
xmax => {
default => ' 10.0',
test => $real_test,
description => 'maximum x-value shown in plot',
edit_type => 'entry',
size => '10'
},
ymin => {
default => '-10.0',
test => $real_test,
description => 'minimum y-value shown in plot',
edit_type => 'entry',
size => '10'
},
ymax => {
default => ' 10.0',
test => $real_test,
description => 'maximum y-value shown in plot',
edit_type => 'entry',
size => '10'
}
);
my @curve_edit_order = ('color','name','linestyle','pointtype','pointsize','limit');
my %curve_defaults =
(
color => {
default => 'x000000',
test => $color_test,
description => 'color of curve (x000000)',
edit_type => 'entry',
size => '10'
},
name => {
default => '',
test => $words_test,
description => 'name of curve to appear in key',
edit_type => 'entry',
size => '20'
},
linestyle => {
default => 'lines',
test => $linestyle_test,
description => 'Line style',
edit_type => 'choice',
choices => [keys(%linestyles)]
},
# gnuplots term=gif driver does not handle linewidth :(
# linewidth => {
# default => 1,
# test => $int_test,
# description => 'Line width (may not apply to all line styles)',
# edit_type => 'choice',
# choices => [1,2,3,4,5,6,7,8,9,10]
# },
pointsize => {
default => 1,
test => $pos_real_test,
description => 'point size (may not apply to all line styles)',
edit_type => 'entry',
size => '5'
},
pointtype => {
default => 1,
test => $int_test,
description => 'point type (may not apply to all line styles)',
edit_type => 'choice',
choices => [0,1,2,3,4,5,6]
},
limit => {
default => 'closed',
test => sub {$_[0]=~/^(closed|x1|x2|y1|y2)$/},
description => 'point to fill -- for filledcurves',
edit_type => 'choice',
choices => ['closed','x1','x2','y1','y2']
},
);
###################################################################
## ##
## parsing and edit rendering ##
## ##
###################################################################
undef %Apache::lonplot::plot;
my (%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
sub start_gnuplot {
undef(%Apache::lonplot::plot); undef(%key); undef(%axis);
undef($title); undef($xlabel); undef($ylabel);
undef(@labels); undef(@curves);
undef(%xtics); undef(%ytics);
#
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
&Apache::lonxml::register('Apache::lonplot',
('title','xlabel','ylabel','key','axis','label','curve',
'xtics','ytics'));
push (@Apache::lonxml::namespace,'lonplot');
if ($target eq 'web' || $target eq 'tex') {
&get_attributes(\%Apache::lonplot::plot,\%gnuplot_defaults,$parstack,$safeeval,
$tagstack->[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'GnuPlot');
$result .= &edit_attributes($target,$token,\%gnuplot_defaults,
\@gnuplot_edit_order)
.&Apache::edit::end_row()
.&Apache::edit::start_spanning_row();
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%gnuplot_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_gnuplot {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
pop @Apache::lonxml::namespace;
&Apache::lonxml::deregister('Apache::lonplot',
('title','xlabel','ylabel','key','axis','label','curve'));
my $result = '';
my $randnumber;
# need to call rand everytime start_script would evaluate, as the
# safe space rand number generator and the global rand generator
# are not separate
if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
$target eq 'answer') {
$randnumber=int(rand(1000));
}
if ($target eq 'web' || $target eq 'tex') {
&check_inputs(); # Make sure we have all the data we need
##
## Determine filename
my $tmpdir = '/home/httpd/perl/tmp/';
my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
'_'.time.'_'.$$.$randnumber.'_plot';
## Write the plot description to the file
&write_gnuplot_file($tmpdir,$filename,$target);
$filename = &escape($filename);
## return image tag for the plot
if ($target eq 'web') {
$result .= <<"ENDIMAGE";
<img src = "/cgi-bin/plot.$weboutputformat?file=$filename.data"
width = "$Apache::lonplot::plot{'width'}"
height = "$Apache::lonplot::plot{'height'}"
align = "$Apache::lonplot::plot{'align'}"
alt = "$Apache::lonplot::plot{'alttag'}" />
ENDIMAGE
} elsif ($target eq 'tex') {
&Apache::lonxml::debug(" gnuplot wid = $Apache::lonplot::plot{'width'}");
&Apache::lonxml::debug(" gnuplot ht = $Apache::lonplot::plot{'height'}");
#might be inside the safe space, register the URL for later
&Apache::lonxml::register_ssi("/cgi-bin/plot.gif?file=$filename.data&output=eps");
$result = "%DYNAMICIMAGE:$Apache::lonplot::plot{'width'}:$Apache::lonplot::plot{'height'}:$Apache::lonplot::plot{'texwidth'}\n";
$result .= '\graphicspath{{/home/httpd/perl/tmp/}}'."\n";
$result .= '\includegraphics[width='.$Apache::lonplot::plot{'texwidth'}.' mm]{'.&unescape($filename).'.eps}';
}
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##--------------------------------------------------------------- xtics
sub start_xtics {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
&get_attributes(\%xtics,\%tic_defaults,$parstack,$safeeval,
$tagstack->[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'xtics');
$result .= &edit_attributes($target,$token,\%tic_defaults,
\@tic_edit_order);
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%tic_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_xtics {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##--------------------------------------------------------------- ytics
sub start_ytics {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
&get_attributes(\%ytics,\%tic_defaults,$parstack,$safeeval,
$tagstack->[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'ytics');
$result .= &edit_attributes($target,$token,\%tic_defaults,
\@tic_edit_order);
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%tic_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_ytics {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##----------------------------------------------------------------- key
sub start_key {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
$tagstack->[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Plot Key');
$result .= &edit_attributes($target,$token,\%key_defaults);
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%key_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_key {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- title
sub start_title {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
$title = &Apache::lonxml::get_all_text("/title",$parser,$style);
$title=&Apache::run::evaluate($title,$safeeval,$$parstack[-1]);
$title =~ s/\n/ /g;
if (length($title) > $max_str_len) {
$title = substr($title,0,$max_str_len);
}
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_start($target,$token,'Plot Title');
my $text=&Apache::lonxml::get_all_text("/title",$parser,$style);
$result.=&Apache::edit::editline('',$text,'',60);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield("/title",$parser);
}
return $result;
}
sub end_title {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- xlabel
sub start_xlabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
$xlabel = &Apache::lonxml::get_all_text("/xlabel",$parser,$style);
$xlabel=&Apache::run::evaluate($xlabel,$safeeval,$$parstack[-1]);
$xlabel =~ s/\n/ /g;
if (length($xlabel) > $max_str_len) {
$xlabel = substr($xlabel,0,$max_str_len);
}
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
my $text=&Apache::lonxml::get_all_text("/xlabel",$parser,$style);
$result.=&Apache::edit::editline('',$text,'',60);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield("/xlabel",$parser);
}
return $result;
}
sub end_xlabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- ylabel
sub start_ylabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
$ylabel = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
$ylabel = &Apache::run::evaluate($ylabel,$safeeval,$$parstack[-1]);
$ylabel =~ s/\n/ /g;
if (length($ylabel) > $max_str_len) {
$ylabel = substr($ylabel,0,$max_str_len);
}
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
my $text = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
$result .= &Apache::edit::editline('',$text,'',60);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield("/ylabel",$parser);
}
return $result;
}
sub end_ylabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- label
sub start_label {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
my %label;
&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
$tagstack->[-1]);
my $text = &Apache::lonxml::get_all_text("/label",$parser,$style);
$text = &Apache::run::evaluate($text,$safeeval,$$parstack[-1]);
$text =~ s/\n/ /g;
$text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
$label{'text'} = $text;
push(@labels,\%label);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Plot Label');
$result .= &edit_attributes($target,$token,\%label_defaults);
my $text = &Apache::lonxml::get_all_text("/label",$parser,$style);
$result .= &Apache::edit::end_row().
&Apache::edit::start_spanning_row().
&Apache::edit::editline('',$text,'',60);
} elsif ($target eq 'modified') {
&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%label_defaults));
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield("/label",$parser);
}
return $result;
}
sub end_label {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- curve
sub start_curve {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
&Apache::lonxml::register('Apache::lonplot',('function','data'));
push (@Apache::lonxml::namespace,'curve');
if ($target eq 'web' || $target eq 'tex') {
my %curve;
&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
$tagstack->[-1]);
push (@curves,\%curve);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Curve');
$result .= &edit_attributes($target,$token,\%curve_defaults,
\@curve_edit_order)
.&Apache::edit::end_row()
.&Apache::edit::start_spanning_row();
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%curve_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_curve {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
pop @Apache::lonxml::namespace;
&Apache::lonxml::deregister('Apache::lonplot',('function','data'));
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------ curve function
sub start_function {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
if (exists($curves[-1]->{'data'})) {
&Apache::lonxml::warning
('Use of the <b>curve function</b> tag precludes use of '.
' the <b>curve data</b> tag. '.
'The curve data tag will be omitted in favor of the '.
'curve function declaration.');
delete $curves[-1]->{'data'} ;
}
my $function = &Apache::lonxml::get_all_text("/function",$parser,
$style);
$function = &Apache::run::evaluate($function,$safeeval,$$parstack[-1]);
$curves[-1]->{'function'} = $function;
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
my $text = &Apache::lonxml::get_all_text("/function",$parser,$style);
$result .= &Apache::edit::editline('',$text,'',60);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield("/function",$parser);
}
return $result;
}
sub end_function {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result .= &Apache::edit::end_table();
}
return $result;
}
##------------------------------------------------------------ curve data
sub start_data {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
if (exists($curves[-1]->{'function'})) {
&Apache::lonxml::warning
('Use of the <b>curve function</b> tag precludes use of '.
' the <b>curve data</b> tag. '.
'The curve function tag will be omitted in favor of the '.
'curve data declaration.');
delete($curves[-1]->{'function'});
}
my $datatext = &Apache::lonxml::get_all_text("/data",$parser,$style);
$datatext=&Apache::run::evaluate($datatext,$safeeval,$$parstack[-1]);
# Deal with cases where we're given an array...
if ($datatext =~ /^\@/) {
$datatext = &Apache::run::run('return "'.$datatext.'"',
$safeeval,1);
}
$datatext =~ s/\s+/ /g;
# Need to do some error checking on the @data array -
# make sure it's all numbers and make sure each array
# is of the same length.
my @data;
if ($datatext =~ /,/) { # comma deliminated
@data = split /,/,$datatext;
} else { # Assume it's space separated.
@data = split / /,$datatext;
}
for (my $i=0;$i<=$#data;$i++) {
# Check that it's non-empty
if (! defined($data[$i])) {
&Apache::lonxml::warning(
'undefined curve data value. Replacing with '.
' pi/e = 1.15572734979092');
$data[$i] = 1.15572734979092;
}
# Check that it's a number
if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
&Apache::lonxml::warning(
'Bad curve data value of '.$data[$i].' Replacing with '.
' pi/e = 1.15572734979092');
$data[$i] = 1.15572734979092;
}
}
# complain if the number of data points is not the same as
# in previous sets of data.
if (($curves[-1]->{'data'}) && ($#data != $#{@{$curves[-1]->{'data'}->[0]}})){
&Apache::lonxml::warning
('Number of data points is not consistent with previous '.
'number of data points');
}
push @{$curves[-1]->{'data'}},\@data;
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
my $text = &Apache::lonxml::get_all_text("/data",$parser,$style);
$result .= &Apache::edit::editline('',$text,'',60);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield("/data",$parser);
}
return $result;
}
sub end_data {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result .= &Apache::edit::end_table();
}
return $result;
}
##------------------------------------------------------------------- axis
sub start_axis {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
$tagstack->[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
$result .= &edit_attributes($target,$token,\%axis_defaults,
\@axis_edit_order);
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%axis_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_axis {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
} elsif ($target eq 'modified') {
}
return $result;
}
###################################################################
## ##
## Utility Functions ##
## ##
###################################################################
##----------------------------------------------------------- set_defaults
sub set_defaults {
my ($var,$defaults) = @_;
my $key;
foreach $key (keys(%$defaults)) {
$var->{$key} = $defaults->{$key}->{'default'};
}
}
##------------------------------------------------------------------- misc
sub get_attributes{
my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
foreach my $attr (keys(%{$defaults})) {
if ($attr eq 'texwidth' || $attr eq 'texfont') {
$values->{$attr} =
&Apache::lonxml::get_param($attr,$parstack,$safeeval,undef,1);
} else {
$values->{$attr} =
&Apache::lonxml::get_param($attr,$parstack,$safeeval);
}
if ($values->{$attr} eq '' | !defined($values->{$attr})) {
$values->{$attr} = $defaults->{$attr}->{'default'};
next;
}
my $test = $defaults->{$attr}->{'test'};
if (! &$test($values->{$attr})) {
&Apache::lonxml::warning
($tag.':'.$attr.': Bad value.'.'Replacing your value with : '
.$defaults->{$attr}->{'default'} );
$values->{$attr} = $defaults->{$attr}->{'default'};
}
}
return ;
}
##------------------------------------------------------- write_gnuplot_file
sub write_gnuplot_file {
my ($tmpdir,$filename,$target)= @_;
my $gnuplot_input = '';
my $curve;
my $pt = $Apache::lonplot::plot{'texfont'};
#
# Check to be sure we do not have any empty curves
my @curvescopy;
foreach my $curve (@curves) {
if (exists($curve->{'function'})) {
if ($curve->{'function'} !~ /^\s*$/) {
push(@curvescopy,$curve);
}
} elsif (exists($curve->{'data'})) {
foreach my $data (@{$curve->{'data'}}) {
if (scalar(@$data) > 0) {
push(@curvescopy,$curve);
last;
}
}
}
}
@curves = @curvescopy;
# Collect all the colors
my @Colors;
push @Colors, $Apache::lonplot::plot{'bgcolor'};
push @Colors, $Apache::lonplot::plot{'fgcolor'};
push @Colors, (defined($axis{'color'})?$axis{'color'}:$Apache::lonplot::plot{'fgcolor'});
foreach $curve (@curves) {
push @Colors, ($curve->{'color'} ne '' ?
$curve->{'color'} :
$Apache::lonplot::plot{'fgcolor'} );
}
# set term
if ($target eq 'web') {
$gnuplot_input .= 'set term '.$weboutputformat .' ';
$gnuplot_input .= 'transparent ' if ($Apache::lonplot::plot{'transparent'} eq 'on');
$gnuplot_input .= $Apache::lonplot::plot{'font'} . ' ';
$gnuplot_input .= 'size '.$Apache::lonplot::plot{'width'}.','.$Apache::lonplot::plot{'height'}.' ';
$gnuplot_input .= "@Colors\n";
# set output
$gnuplot_input .= "set output\n";
} elsif ($target eq 'tex') {
$gnuplot_input .= "set term postscript eps $Apache::lonplot::plot{'plotcolor'} solid \"Helvetica\" $pt \n";
$gnuplot_input .= "set output \"/home/httpd/perl/tmp/".
&unescape($filename).".eps\"\n";
}
# cartesian or polar plot?
if (lc($Apache::lonplot::plot{'plottype'}) eq 'polar') {
$gnuplot_input .= 'set polar'.$/;
} else {
# Assume Cartesian
}
# cartesian or polar grid?
if (lc($Apache::lonplot::plot{'gridtype'}) eq 'polar') {
$gnuplot_input .= 'set grid polar'.$/;
} else {
# Assume Cartesian
}
# solid or pattern for boxes?
if (lc($Apache::lonplot::plot{'fillstyle'}) eq 'solid') {
$gnuplot_input .= 'set style fill solid '.
$Apache::lonplot::plot{'solid'}.$Apache::lonplot::plot{'box_border'}.$/;
} elsif (lc($Apache::lonplot::plot{'fillstyle'}) eq 'pattern') {
$gnuplot_input .= 'set style fill pattern '.$Apache::lonplot::plot{'pattern'}.$Apache::lonplot::plot{'box_border'}.$/;
} elsif (lc($Apache::lonplot::plot{'fillstyle'}) eq 'empty') {
}
# margin
if (lc($Apache::lonplot::plot{'lmargin'}) ne 'default') {
$gnuplot_input .= 'set lmargin '.$Apache::lonplot::plot{'lmargin'}.$/;
}
if (lc($Apache::lonplot::plot{'rmargin'}) ne 'default') {
$gnuplot_input .= 'set rmargin '.$Apache::lonplot::plot{'rmargin'}.$/;
}
if (lc($Apache::lonplot::plot{'tmargin'}) ne 'default') {
$gnuplot_input .= 'set tmargin '.$Apache::lonplot::plot{'tmargin'}.$/;
}
if (lc($Apache::lonplot::plot{'bmargin'}) ne 'default') {
$gnuplot_input .= 'set bmargin '.$Apache::lonplot::plot{'bmargin'}.$/;
}
# tic scales
$gnuplot_input .= 'set ticscale '.
$Apache::lonplot::plot{'major_ticscale'}.' '.$Apache::lonplot::plot{'minor_ticscale'}.$/;
#boxwidth
if (lc($Apache::lonplot::plot{'boxwidth'}) ne '') {
$gnuplot_input .= 'set boxwidth '.$Apache::lonplot::plot{'boxwidth'}.$/;
}
# gridlayer
$gnuplot_input .= 'set grid noxtics noytics front '.$/
if ($Apache::lonplot::plot{'gridlayer'} eq 'on');
# grid
$gnuplot_input .= 'set grid'.$/ if ($Apache::lonplot::plot{'grid'} eq 'on');
# border
$gnuplot_input .= ($Apache::lonplot::plot{'border'} eq 'on'?
'set border'.$/ :
'set noborder'.$/ );
# sampling rate for non-data curves
$gnuplot_input .= "set samples $Apache::lonplot::plot{'samples'}\n";
# title, xlabel, ylabel
# titles
if ($target eq 'tex') {
$gnuplot_input .= "set title \"$title\" font \"Helvetica,".$pt."pt\"\n" if (defined($title)) ;
$gnuplot_input .= "set xlabel \"$xlabel\" font \"Helvetica,".$pt."pt\" \n" if (defined($xlabel));
$gnuplot_input .= "set ylabel \"$ylabel\" font \"Helvetica,".$pt."pt\"\n" if (defined($ylabel));
} else {
$gnuplot_input .= "set title \"$title\" \n" if (defined($title)) ;
$gnuplot_input .= "set xlabel \"$xlabel\" \n" if (defined($xlabel));
$gnuplot_input .= "set ylabel \"$ylabel\" \n" if (defined($ylabel));
}
# tics
if (%xtics) {
$gnuplot_input .= "set xtics $xtics{'location'} ";
$gnuplot_input .= ( $xtics{'mirror'} eq 'on'?"mirror ":"nomirror ");
$gnuplot_input .= "$xtics{'start'}, ";
$gnuplot_input .= "$xtics{'increment'}, ";
$gnuplot_input .= "$xtics{'end'}\n";
if ($xtics{'minorfreq'} != 0) {
$gnuplot_input .= "set mxtics ".$xtics{'minorfreq'}."\n";
}
}
if (%ytics) {
$gnuplot_input .= "set ytics $ytics{'location'} ";
$gnuplot_input .= ( $ytics{'mirror'} eq 'on'?"mirror ":"nomirror ");
$gnuplot_input .= "$ytics{'start'}, ";
$gnuplot_input .= "$ytics{'increment'}, ";
$gnuplot_input .= "$ytics{'end'}\n";
if ($ytics{'minorfreq'} != 0) {
$gnuplot_input .= "set mytics ".$ytics{'minorfreq'}."\n";
}
}
# axis
if (%axis) {
$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
}
# Key
if (%key) {
$gnuplot_input .= 'set key '.$key{'pos'}.' ';
if ($key{'title'} ne '') {
$gnuplot_input .= 'title "'.$key{'title'}.'" ';
}
$gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
} else {
$gnuplot_input .= 'set nokey'.$/;
}
# labels
my $label;
foreach $label (@labels) {
$gnuplot_input .= 'set label "'.$label->{'text'}.'" at '.
$label->{'xpos'}.','.$label->{'ypos'}.' '.$label->{'justify'};
if ($target eq 'tex') {
$gnuplot_input .=' font "Helvetica,'.$pt.'pt"' ;
}
$gnuplot_input .= $/;
}
if ($target eq 'tex') {
$gnuplot_input .="set size 1,".$Apache::lonplot::plot{'height'}/$Apache::lonplot::plot{'width'}*1.38;
$gnuplot_input .="\n";
}
# curves
$gnuplot_input .= 'plot ';
for (my $i = 0;$i<=$#curves;$i++) {
$curve = $curves[$i];
$gnuplot_input.= ', ' if ($i > 0);
if (exists($curve->{'function'})) {
$gnuplot_input.=
$curve->{'function'}.' title "'.
$curve->{'name'}.'" with '.
$curve->{'linestyle'};
$gnuplot_input.= ' linewidth 4 ' if ($target eq 'tex');
if (($curve->{'linestyle'} eq 'points') ||
($curve->{'linestyle'} eq 'linespoints') ||
($curve->{'linestyle'} eq 'errorbars') ||
($curve->{'linestyle'} eq 'xerrorbars') ||
($curve->{'linestyle'} eq 'yerrorbars') ||
($curve->{'linestyle'} eq 'xyerrorbars')) {
$gnuplot_input.=' pointtype '.$curve->{'pointtype'};
$gnuplot_input.=' pointsize '.$curve->{'pointsize'};
} elsif ($curve->{'linestyle'} eq 'filledcurves') {
$gnuplot_input.= ' '.$curve->{'limit'};
}
} elsif (exists($curve->{'data'})) {
# Store data values in $datatext
my $datatext = '';
# get new filename
my $datafilename = "$tmpdir/$filename.data.$i";
my $fh=Apache::File->new(">$datafilename");
# Compile data
my @Data = @{$curve->{'data'}};
my @Data0 = @{$Data[0]};
for (my $i =0; $i<=$#Data0; $i++) {
my $dataset;
foreach $dataset (@Data) {
$datatext .= $dataset->[$i] . ' ';
}
$datatext .= $/;
}
# write file
print $fh $datatext;
close ($fh);
# generate gnuplot text
$gnuplot_input.= '"'.$datafilename.'" title "'.
$curve->{'name'}.'" with '.
$curve->{'linestyle'};
$gnuplot_input.= ' linewidth 4 ' if ($target eq 'tex');
if (($curve->{'linestyle'} eq 'points') ||
($curve->{'linestyle'} eq 'linespoints') ||
($curve->{'linestyle'} eq 'errorbars') ||
($curve->{'linestyle'} eq 'xerrorbars') ||
($curve->{'linestyle'} eq 'yerrorbars') ||
($curve->{'linestyle'} eq 'xyerrorbars')) {
$gnuplot_input.=' pointtype '.$curve->{'pointtype'};
$gnuplot_input.=' pointsize '.$curve->{'pointsize'};
} elsif ($curve->{'linestyle'} eq 'filledcurves') {
$gnuplot_input.= ' '.$curve->{'limit'};
}
}
}
# Write the output to a file.
my $fh=Apache::File->new(">$tmpdir$filename.data");
print $fh $gnuplot_input;
close($fh);
# That's all folks.
return ;
}
#---------------------------------------------- check_inputs
sub check_inputs {
## Note: no inputs, no outputs - this acts only on global variables.
## Make sure we have all the input we need:
if (! %Apache::lonplot::plot) { &set_defaults(\%Apache::lonplot::plot,\%gnuplot_defaults); }
if (! %key ) {} # No key for this plot, thats okay
# if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
if (! defined($title )) {} # No title for this plot, thats okay
if (! defined($xlabel)) {} # No xlabel for this plot, thats okay
if (! defined($ylabel)) {} # No ylabel for this plot, thats okay
if ($#labels < 0) { } # No labels for this plot, thats okay
if ($#curves < 0) {
&Apache::lonxml::warning("No curves specified for plot!!!!");
return '';
}
my $curve;
foreach $curve (@curves) {
if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
&Apache::lonxml::warning("One of the curves specified did not contain any curve data or curve function declarations\n");
return '';
}
}
}
#------------------------------------------------ make_edit
sub edit_attributes {
my ($target,$token,$defaults,$keys) = @_;
my ($result,@keys);
if ($keys && ref($keys) eq 'ARRAY') {
@keys = @$keys;
} else {
@keys = sort(keys(%$defaults));
}
foreach my $attr (@keys) {
# append a ' ' to the description if it doesn't have one already.
my $description = $defaults->{$attr}->{'description'};
$description .= ' ' if ($description !~ / $/);
if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
$result .= &Apache::edit::text_arg
($description,$attr,$token,
$defaults->{$attr}->{'size'});
} elsif ($defaults->{$attr}->{'edit_type'} eq 'choice') {
$result .= &Apache::edit::select_or_text_arg
($description,$attr,$defaults->{$attr}->{'choices'},$token);
} elsif ($defaults->{$attr}->{'edit_type'} eq 'onoff') {
$result .= &Apache::edit::select_or_text_arg
($description,$attr,['on','off'],$token);
}
$result .= '<br />';
}
return $result;
}
###################################################################
## ##
## Insertion functions for editing plots ##
## ##
###################################################################
sub insert_gnuplot {
my $result = '';
# plot attributes
$result .= "\n<gnuplot ";
foreach my $attr (keys(%gnuplot_defaults)) {
$result .= "\n $attr=\"$gnuplot_defaults{$attr}->{'default'}\"";
}
$result .= ">";
# Add the components (most are commented out for simplicity)
# $result .= &insert_key();
# $result .= &insert_axis();
# $result .= &insert_title();
# $result .= &insert_xlabel();
# $result .= &insert_ylabel();
$result .= &insert_curve();
# close up the <gnuplot>
$result .= "\n</gnuplot>";
return $result;
}
sub insert_tics {
my $result;
$result .= &insert_xtics() . &insert_ytics;
return $result;
}
sub insert_xtics {
my $result;
$result .= "\n <xtics ";
foreach my $attr (keys(%tic_defaults)) {
$result .= "\n $attr=\"$tic_defaults{$attr}->{'default'}\" ";
}
$result .= "/>";
return $result;
}
sub insert_ytics {
my $result;
$result .= "\n <ytics ";
foreach my $attr (keys(%tic_defaults)) {
$result .= "\n $attr=\"$tic_defaults{$attr}->{'default'}\" ";
}
$result .= "/>";
return $result;
}
sub insert_key {
my $result;
$result .= "\n <key ";
foreach my $attr (keys(%key_defaults)) {
$result .= "\n $attr=\"$key_defaults{$attr}->{'default'}\"";
}
$result .= " />";
return $result;
}
sub insert_axis{
my $result;
$result .= "\n <axis ";
foreach my $attr (keys(%axis_defaults)) {
$result .= "\n $attr=\"$axis_defaults{$attr}->{'default'}\"";
}
$result .= " />";
return $result;
}
sub insert_title { return "\n <title></title>"; }
sub insert_xlabel { return "\n <xlabel></xlabel>"; }
sub insert_ylabel { return "\n <ylabel></ylabel>"; }
sub insert_label {
my $result;
$result .= "\n <label ";
foreach my $attr (keys(%label_defaults)) {
$result .= "\n $attr=\"".
$label_defaults{$attr}->{'default'}."\"";
}
$result .= "></label>";
return $result;
}
sub insert_curve {
my $result;
$result .= "\n <curve ";
foreach my $attr (keys(%curve_defaults)) {
$result .= "\n $attr=\"".
$curve_defaults{$attr}->{'default'}."\"";
}
$result .= " >";
$result .= &insert_data().&insert_data()."\n </curve>";
}
sub insert_function {
my $result;
$result .= "\n <function></function>";
return $result;
}
sub insert_data {
my $result;
$result .= "\n <data></data>";
return $result;
}
##----------------------------------------------------------------------
1;
__END__
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