# The LearningOnline Network with CAPA
# Dynamic plot
#
# $Id: lonplot.pm,v 1.185 2022/09/21 11:49:48 raeburn 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 Apache::lonlocal;
use Time::HiRes qw(gettimeofday);
use LONCAPA;
use vars qw/$weboutputformat $version $colorprefix/;
BEGIN {
&Apache::lonxml::register('Apache::lonplot',('gnuplot'));
#
# Determine the version of GNUPLOT
$weboutputformat = 'gif';
my $versionstring = `gnuplot --version 2>/dev/null`;
($version) = ($versionstring =~ /^gnuplot ([\d.]+)/);
if ($version >= 4) {
$weboutputformat = 'png';
}
$colorprefix = 'x';
if ($version >= 4.6) {
$colorprefix = '#';
}
}
=pod
##
## 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, rotate, zlayer
##
## @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 ##
## ##
###################################################################
=cut
my $max_str_len = 50; # if a label, title, xlabel, or ylabel text
# is longer than this, it will be truncated.
my %linetypes = # For png use these linetypes.
(
solid => 1,
dashed => 0
);
my %ps_linetypes = # For ps the line types are different!
(
solid => 1,
dashed => 7
);
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 $color_test;
if ($version < 4.6) {
$color_test = sub {$_[0]=~s/\s+//g;$_[0]=~s/^\#/x/;$_[0]=~s/^x+/x/;$_[0]=~/^x[\da-fA-F]{6}$/};
} else {
$color_test = sub {$_[0]=~s/\s+//g;$_[0]=~s/^x/#/;$_[0]=~s/^\#+/#/;$_[0]=~/^\#[\da-fA-F]{6}$/};
}
my $onoff_test = sub {$_[0]=~/^(on|off)$/};
my $key_pos_test = sub {$_[0]=~/^(top|bottom|right|left|outside|below| )+$/};
my $sml_test = sub {$_[0]=~/^(\d+|small|medium|large)$/};
my $linestyle_test = sub {exists($linestyles{$_[0]})};
my $words_test = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w~!\@\#\$\%^&\*\(\)-=_\+\[\]\{\}:\;\'<>,\.\/\?\\]+ ?)+$/};
my $arrowhead_test = sub{$_[0]=~/^(nohead|head|heads| )+$/};
my $arrowstyle_test= sub{$_[0]=~/^(filled|empty|nofilled)+$/};
my $degree_test = sub{&$pos_real_test($_[0]) && ($_[0] <= 360.0)};
###################################################################
## ##
## Attribute metadata ##
## ##
###################################################################
my @gnuplot_edit_order =
qw/alttag bgcolor fgcolor height width texwidth fontface font texfont
transparent grid samples
border align 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 => $colorprefix.'ffffff',
test => $color_test,
description => 'Background color of image ('.$colorprefix.'ffffff)',
edit_type => 'entry',
size => '10',
class => 'colorchooser'
},
fgcolor => {
default => $colorprefix.'000000',
test => $color_test,
description => 'Foreground color of image ('.$colorprefix.'000000)',
edit_type => 'entry',
size => '10',
class => 'colorchooser'
},
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 => '9',
test => $sml_test,
description => 'Font size to use in web output (pts)',
edit_type => 'choice',
choices => [['5','5 (small)'],'6','7','8',['9','9 (medium)'],'10',['11','11 (large)'],'12','15']
},
fontface => {
default => 'sans-serif',
test => sub {$_[0]=~/^(sans-serif|serif|classic)$/},
description => 'Type of font to use',
edit_type => 'choice',
choices => ['sans-serif','serif', 'classic']
},
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','center']
},
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|Linear-Log|Log-Linear|Log-Log)$/},
description => 'Grid type:',
edit_type => 'choice',
choices => ['Cartesian','Polar','Linear-Log','Log-Linear','Log-Log']
},
lmargin => {
default => 'default',
test => sub {$_[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 is 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']
},
rotate => {
default => 0,
test => $real_test,
description => 'Rotation of label (degrees)',
edit_type => 'entry',
size => '10',
},
zlayer => {
default => '',
test => sub {$_[0]=~/^(front|back)$/},
description => 'Z position of label',
edit_type => 'choice',
choices => ['front','back'],
},
);
my @tic_edit_order = ('location','mirror','start','increment','end',
'minorfreq');
my %tic_defaults =
(
location => {
default => 'border',
test => sub {$_[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'
},
rotate => {
default => 'off',
test => $onoff_test,
description => 'Rotate tic label by 90 degrees if on',
edit_type => 'onoff'
}
);
my @axis_edit_order = ('color','xmin','xmax','ymin','ymax','xformat', 'yformat', 'xzero', 'yzero');
my %axis_defaults =
(
color => {
default => $colorprefix.'000000',
test => $color_test,
description => 'Color of grid lines ('.$colorprefix.'000000)',
edit_type => 'entry',
size => '10',
class => 'colorchooser'
},
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 => $real_test,
description => 'Maximum y-value shown in plot',
edit_type => 'entry',
size => '10'
},
xformat => {
default => 'on',
test => sub {$_[0]=~/^(on|off|\d+(f|F|e|E|P(|\s*[Pp][Ii])))$/},
description => 'X-axis number formatting',
edit_type => 'choice',
choices => ['on', 'off', '2e', '2f'],
},
yformat => {
default => 'on',
test => sub {$_[0]=~/^(on|off|\d+(f|F|e|E|P(|\s*[Pp][Ii])))$/},
description => 'Y-axis number formatting',
edit_type => 'choice',
choices => ['on', 'off', '2e', '2f'],
},
xzero => {
default => 'off',
test => sub {$_[0]=~/^(off|line|thick-line|dotted)$/},
description => 'Show x-zero (y=0) axis',
edit_type => 'choice',
choices => ['off', 'line', 'thick-line', 'dotted'],
},
yzero => {
default => 'off',
test => sub {$_[0]=~/^(off|line|thick-line|dotted)$/},
description => 'Show y-zero (x=0) axis',
edit_type => 'choice',
choices => ['off', 'line', 'thick-line', 'dotted'],
},
);
my @curve_edit_order = ('color','name','linestyle','linewidth','linetype',
'pointtype','pointsize','limit', 'arrowhead', 'arrowstyle',
'arrowlength', 'arrowangle', 'arrowbackangle'
);
my %curve_defaults =
(
color => {
default => $colorprefix.'000000',
test => $color_test,
description => 'Color of curve ('.$colorprefix.'000000)',
edit_type => 'entry',
size => '10',
class => 'colorchooser'
},
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 => 'Plot with:',
edit_type => 'choice',
choices => [keys(%linestyles)]
},
linewidth => {
default => 1,
test => $int_test,
description => 'Line width (may not apply to all plot styles)',
edit_type => 'choice',
choices => [1,2,3,4,5,6,7,8,9,10]
},
linetype => {
default => 'solid',
test => sub {$_[0]=~/^(solid|dashed)$/},
description => 'Line type (may not apply to all plot styles)',
edit_type => 'choice',
choices => ['solid', 'dashed']
},
pointsize => {
default => 1,
test => $pos_real_test,
description => 'Point size (may not apply to all plot styles)',
edit_type => 'entry',
size => '5'
},
pointtype => {
default => 1,
test => $int_test,
description => 'Point type (may not apply to all plot styles)',
edit_type => 'choice',
choices => [0,1,2,3,4,5,6]
},
limit => {
default => 'closed',
test => sub {$_[0]=~/^(above|below|closed|x1|x2|y1|y2)$/},
description => 'Point to fill -- for filledcurves',
edit_type => 'choice',
choices => ['above', 'below', 'closed','x1','x2','y1','y2']
},
arrowhead => {
default => 'head',
test => $arrowhead_test,
description => 'Vector arrow head type',
edit_type => 'choice',
choices => ['nohead', 'head', 'heads']
},
arrowstyle => {
default => 'filled',
test => $arrowstyle_test,
description => 'Vector arrow head style',
edit_type => 'choice',
choices => ['filled', 'empty', 'nofilled']
},
arrowlength => {
default => 0.02,
test => $pos_real_test,
description => "Length of vector arrow (only applies to vector plots)",
edit_type => 'entry',
size => '5'
},
arrowangle => {
default => 10.0,
test => $degree_test,
description => 'Angle of arrow branches to arrow body (only applies to vector plots)',
edit_type => 'entry',
size => '5'
},
arrowbackangle => {
default => 90.0,
test => $degree_test,
descripton => 'Angle of arrow back lines to branches.',
edit_type => 'entry',
size => '5'
}
);
###################################################################
## ##
## parsing and edit rendering ##
## ##
###################################################################
undef %Apache::lonplot::plot;
my (%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
my $current_tics; # Reference to the current tick hash
sub start_gnuplot {
undef(%Apache::lonplot::plot); undef(%key); undef(%axis);
undef($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') {
&fixup_colors($token,['bgcolor','fgcolor']);
$result .= &Apache::edit::tag_start($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));
my $fixed = &fixup_colors($token,['bgcolor','fgcolor']);
if ($constructtag || $fixed) {
$result = &Apache::edit::rebuild_tag($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;
my $tmpdir =LONCAPA::tempdir(); # Where temporary files live:
# need to call rand everytime start_script would evaluate, as the
# safe space rand number generator and the global rand generator
# are not separate
if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
$target eq 'answer') {
$randnumber=int(rand(1000));
}
if ($target eq 'web' || $target eq 'tex') {
&check_inputs(); # Make sure we have all the data we need
##
## Determine filename
my ($seconds, $microseconds) = gettimeofday;
my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
'_'.$seconds.'_'.$microseconds.'_'.$$.$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') {
my $srcatt = "src=\"/cgi-bin/plot.$weboutputformat?file=$filename.data\"";
my $widthatt = "width=\"$Apache::lonplot::plot{'width'}\"";
my $heightatt = "height=\"$Apache::lonplot::plot{'height'}\"";
my $alignatt = "align=\"$Apache::lonplot::plot{'align'}\"";
my $altatt = "alt=\"$Apache::lonplot::plot{'alttag'}\"";
if ($Apache::lonplot::plot{'align'} eq 'center') {
$result .= '<div style="text-align:center">'.
"<img $srcatt $widthatt $heightatt $altatt>".
"</div>\n";
} else {
$result .= "<img $srcatt $widthatt $heightatt $alignatt $altatt>";
}
} 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{{'.$tmpdir.'}}'."\n";
if ($Apache::lonplot::plot{'align'} eq 'center') {
$result .= '\begin{center}';
}
$result .= '\includegraphics[width='.$Apache::lonplot::plot{'texwidth'}.' mm]{'.&unescape($filename).'.eps}';
if ($Apache::lonplot::plot{'align'} eq 'center') {
$result .= '\end{center}';
}
}
} 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]);
$current_tics = \%xtics;
&Apache::lonxml::register('Apache::lonplot', 'tic');
} 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') {
&Apache::lonxml::deregister('Apache::lonplot', 'tic');
} 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]);
$current_tics = \%ytics;
&Apache::lonxml::register('Apache::lonplot', 'tic');
} 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') {
&Apache::lonxml::deregister('Apache::lonplot', 'tic');
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##----------------------------------------------------------------
#
# Tic handling:
# The <tic> tag allows users to specify exact Tic positions and labels
# for each axis. In this version we only support level 0 tics (major tic).
# Each tic has associated with it a position and a label
# $current_tics is a reference to the current tick description hash.
# We add elements to an array in that has: ticspecs whose elements
# are 'pos' - the tick position and 'label' - the tic label.
#
sub start_tic {
my ($target, $token, $tagstack, $parstack, $parser, $safeeval, $style) = @_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
my $tic_location = &Apache::lonxml::get_param('location', $parstack, $safeeval);
my $tic_label = &Apache::lonxml::get_all_text('/tic', $parser);
# Tic location must e a real:
if (!&$real_test($tic_location)) {
&Apache::lonxml::warning("Tic location: $tic_location must be a real number");
} else {
if (!defined $current_tics->{'ticspecs'}) {
$current_tics->{'ticspecs'} = [];
}
my $ticspecs = $current_tics->{'ticspecs'};
push (@$ticspecs, {'pos' => $tic_location, 'label' => $tic_label});
}
}
return $result;
}
sub end_tic {
return '';
}
##-----------------------------------------------------------------font
my %font_properties =
(
'classic' => {
face => 'classic',
file => 'DejaVuSansMono-Bold',
printname => 'Helvetica',
tex_no_file => 1,
},
'sans-serif' => {
face => 'sans-serif',
file => 'DejaVuSans',
printname => 'DejaVuSans',
},
'serif' => {
face => 'serif',
file => 'DejaVuSerif',
printname => 'DejaVuSerif',
},
);
sub get_font {
my ($target) = @_;
my ($size, $selected_font);
if ( $Apache::lonplot::plot{'font'} =~ /^(small|medium|large)/) {
$selected_font = $font_properties{'classic'};
if ( $Apache::lonplot::plot{'font'} eq 'small') {
$size = '5';
} elsif ( $Apache::lonplot::plot{'font'} eq 'medium') {
$size = '9';
} elsif ( $Apache::lonplot::plot{'font'} eq 'large') {
$size = '11';
} else {
$size = '9';
}
} else {
$size = $Apache::lonplot::plot{'font'};
$selected_font = $font_properties{$Apache::lonplot::plot{'fontface'}};
}
if ($target eq 'tex' && defined($Apache::lonplot::plot{'texfont'})) {
# $selected_font = $font_properties{'classic'};
$size = $Apache::lonplot::plot{'texfont'};
}
return ($size, $selected_font);
}
##----------------------------------------------------------------- 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;
}
sub parse_label {
my ($target,$text) = @_;
my $parser=HTML::LCParser->new(\$text);
my $result;
while (my $token=$parser->get_token) {
if ($token->[0] eq 'S') {
if ($token->[1] eq 'sub') {
$result .= '_{';
} elsif ($token->[1] eq 'sup') {
$result .= '^{';
} else {
$result .= $token->[4];
}
} elsif ($token->[0] eq 'E') {
if ($token->[1] eq 'sub'
|| $token->[1] eq 'sup') {
$result .= '}';
} else {
$result .= $token->[2];
}
} elsif ($token->[0] eq 'T') {
$result .= &replace_entities($target,$token->[1]);
}
}
return $result;
}
#
# Note that there are severe restrictions on font selection in the
# ps driver now. later in life Gnuplot is supposed to support
# utf-8 fonts in the posts script driver. When this happens,
# the tex entries with comments that include the word <FIX>
# should be changed to print the correct glyphs rather than some
# approximation or fallback of what is intended.
my %lookup =
( # Greek alphabet:
'(Alpha|#913)' => {'tex' => '{/Symbol A}', 'web' => "\x{391}"},
'(Beta|#914)' => {'tex' => '{/Symbol B}', 'web' => "\x{392}"},
'(Chi|#935)' => {'tex' => '{/Symbol C}', 'web' => "\x{3A7}"},
'(Delta|#916)' => {'tex' => '{/Symbol D}', 'web' => "\x{394}"},
'(Epsilon|#917)' => {'tex' => '{/Symbol E}', 'web' => "\x{395}"},
'(Phi|#934)' => {'tex' => '{/Symbol F}', 'web' => "\x{3A6}"},
'(Gamma|#915)' => {'tex' => '{/Symbol G}', 'web' => "\x{393}"},
'(Eta|#919)' => {'tex' => '{/Symbol H}', 'web' => "\x{397}"},
'(Iota|#921)' => {'tex' => '{/Symbol I}', 'web' => "\x{399}"},
'(Kappa|#922)' => {'tex' => '{/Symbol K}', 'web' => "\x{39A}"},
'(Lambda|#923)' => {'tex' => '{/Symbol L}', 'web' => "\x{39B}"},
'(Mu|#924)' => {'tex' => '{/Symbol M}', 'web' => "\x{39C}"},
'(Nu|#925)' => {'tex' => '{/Symbol N}', 'web' => "\x{39D}"},
'(Omicron|#927)' => {'tex' => '{/Symbol O}', 'web' => "\x{39F}"},
'(Pi|#928)' => {'tex' => '{/Symbol P}', 'web' => "\x{3A0}"},
'(Theta|#920)' => {'tex' => '{/Symbol Q}', 'web' => "\x{398}"},
'(Rho|#929)' => {'tex' => '{/Symbol R}', 'web' => "\x{3A1}"},
'(Sigma|#931)' => {'tex' => '{/Symbol S}', 'web' => "\x{3A3}"},
'(Tau|#932)' => {'tex' => '{/Symbol T}', 'web' => "\x{3A4}"},
'(Upsilon|#933)' => {'tex' => '{/Symbol U}', 'web' => "\x{3A5}"},
'(Omega|#937)' => {'tex' => '{/Symbol W}', 'web' => "\x{3A9}"},
'(Xi|#926)' => {'tex' => '{/Symbol X}', 'web' => "\x{39E}"},
'(Psi|#936)' => {'tex' => '{/Symbol Y}', 'web' => "\x{3A8}"},
'(Zeta|#918)' => {'tex' => '{/Symbol Z}', 'web' => "\x{396}"},
'(alpha|#945)' => {'tex' => '{/Symbol a}', 'web' => "\x{3B1}"},
'(beta|#946)' => {'tex' => '{/Symbol b}', 'web' => "\x{3B2}"},
'(chi|#967)' => {'tex' => '{/Symbol c}', 'web' => "\x{3C7}"},
'(delta|#948)' => {'tex' => '{/Symbol d}', 'web' => "\x{3B4}"},
'(epsilon|#949)' => {'tex' => '{/Symbol e}', 'web' => "\x{3B5}"},
'(phi|#966)' => {'tex' => '{/Symbol f}', 'web' => "\x{3C6}"},
'(gamma|#947)' => {'tex' => '{/Symbol g}', 'web' => "\x{3B3}"},
'(eta|#951)' => {'tex' => '{/Symbol h}', 'web' => "\x{3B7}"},
'(iota|#953)' => {'tex' => '{/Symbol i}', 'web' => "\x{3B9}"},
'(kappa|#954)' => {'tex' => '{/Symbol k}', 'web' => "\x{3BA}"},
'(lambda|#955)' => {'tex' => '{/Symbol k}', 'web' => "\x{3BB}"},
'(mu|#956)' => {'tex' => '{/Symbol m}', 'web' => "\x{3BC}"},
'(nu|#957)' => {'tex' => '{/Symbol n}', 'web' => "\x{3BD}"},
'(omicron|#959)' => {'tex' => '{/Symbol o}', 'web' => "\x{3BF}"},
'(pi|#960)' => {'tex' => '{/Symbol p}', 'web' => "\x{3C0}"},
'(theta|#952)' => {'tex' => '{/Symbol q}', 'web' => "\x{3B8}"},
'(rho|#961)' => {'tex' => '{/Symbol r}', 'web' => "\x{3C1}"},
'(sigma|#963)' => {'tex' => '{/Symbol s}', 'web' => "\x{3C3}"},
'(tau|#964)' => {'tex' => '{/Symbol t}', 'web' => "\x{3C4}"},
'(upsilon|#965)' => {'tex' => '{/Symbol u}', 'web' => "\x{3C5}"},
'(omega|#969)' => {'tex' => '{/Symbol w}', 'web' => "\x{3C9}"},
'(xi|#958)' => {'tex' => '{/Symbol x}', 'web' => "\x{3BE}"},
'(psi|#968)' => {'tex' => '{/Symbol y}', 'web' => "\x{3C8}"},
'(zeta|#950)' => {'tex' => '{/Symbol z}', 'web' => "\x{3B6}"},
'(thetasym|#977)' => {'tex' => '{/Symbol \165}', 'web' => "\x{3d1}"},
'(upsih|#978)' => {'tex' => '{/Symbol \241}', 'web' => "\x{3d2}"},
'(piv|#982)' => {'tex' => '{/Symbol \166}', 'web' => "\x{3d6}"},
# Punctuation:
'(quot|#034)' => {'tex' => '\42', 'web' => '\42'},
'(amp|#038)' => {'tex' => '\46', 'web' => '\46'},
'(lt|#060)' => {'tex' => '\74', 'web' => '\74'},
'(gt|#062)' => {'tex' => '\76', 'web' => '\76'},
'#131' => {'tex' => '{/Symbol \246}', 'web' => "\x{192}"},
'#132' => {'tex' => '{/Text \271}', 'web' => "\x{201e}"},
'#133' => {'tex' => '{/Symbol \274}', 'web'=> "\x{2026}"},
'#134' => {'tex' => '{/Text \262}', 'web' => "\x{2020}"},
'#135' => {'tex' => '{/Text \263}', 'web' => "\x{2021}"},
'#136' => {'tex' => '\\\\^', 'web' => '\\\\^'},
'#137' => {'tex' => '%o', 'web' => "\x{2030}"}, # Per Mille <FIX>
'#138' => {'tex' => 'S', 'web' => "\x{160}"}, # S-Caron <FIX>
'#139' => {'tex' => '<', 'web' => '<'},
'#140' => {'tex' => 'AE', 'web' => "\x{152}"}, # AE ligature <FIX>
'#145' => {'tex' => '\140', 'web' => "\x{2018}"},
'#146' => {'tex' => '\47', 'web' => "\x{2019}"},
'#147' => {'tex' => '\140\140', 'web' => "\x{201c}"}, # Left " <FIX>
'#148' => {'tex' => '\47\47', 'web' => '\\"'}, # Right " <FIX>
'#149' => {'tex' => '{/Symbol \267}', 'web' => "\x{2022}"},
'#150' => {'tex' => '{/Text \55}', 'web' => "\x{2013}"}, # en dash
'#151' => {'tex' => '{/Symbol \55}', 'web' => "\x{2014}"}, # em dash
'#152' => {'tex' => '\\\\~', 'web' => '\\\\~'},
'#153' => {'tex' => '{/Symbol \324}', 'web' => "\x{2122}"}, # trademark
# Accented letters, and other furreign language glyphs.
'#154' => {'tex' => 's', 'web' => "\x{161}"}, # small s-caron no ps.
'#155' => {'tex' => '>', 'web' => '\76'}, # >
'#156' => {'tex' => '{/Text \366}', 'web' => "\x{153}"}, # oe ligature.<FIX>
'#159', => {'tex' => 'Y', 'web' => "\x{178}"}, # Y-umlaut - can't print <FIX>
'(nbsp|#160)' => {'tex' => ' ', 'web' => ' '}, # non breaking space.
'(iexcl|#161)' => {'tex' => '{/Text \241}', 'web' => "\x{a1}"}, # inverted !
'(cent|#162)' => {'tex' => '{/Text \242}', 'web' => "\x{a2}"}, # Cent currency.
'(pound|#163)' => {'tex' => '{/Text \243}', 'web' => "\x{a3}"}, # GB Pound currency.
'(curren|#164)' => {'tex' => '{/ZapfDingbats \161}','web' => "\x{a4}"}, # Generic currency symb. <FIX>
'(yen|#165)' => {'tex' => '{/Text \245}', 'web' => "\x{a5}"}, # Yen currency.
'(brvbar|#166)' => {'tex' => '{/Symbol \174}', 'web' => "\x{a6}"}, # Broken vert bar no print.
'(sect|#167)' => {'tex' => '{\247}', 'web' => "\x{a7}"}, # Section symbol.
'(uml|#168)' => {'tex' => '{\250}', 'web' => "\x{a8}"}, # 'naked' umlaut.
'(copy|#169)' => {'tex' => '{/Symbol \343}', 'web' => "\x{a9}"}, # Copyright symbol.
'(ordf|#170)' => {'tex' => '{/Text \343}', 'web' => "\x{aa}"}, # Feminine ordinal.
'(laquo|#171)' => {'tex' => '{/Text \253}', 'web' => "\x{ab}"}, # << quotes.
'(not|#172)' => {'tex' => '\254', 'web' => "\x{ac}"}, # Logical not.
'(shy|#173)' => {'tex' => '\255', 'web' => "\x{ad}"}, # soft hyphen.
'(reg|#174)' => {'tex' => '{/Symbol \342}', 'web' => "\x{ae}"}, # Registered tm.
'(macr|#175)' => {'tex' => '^{\255}', 'web' => "\x{af}"}, # 'naked' macron (overbar).
'(deg|#176)' => {'tex' => '{/Text \260}', 'web' => "\x{b0}"}, # Degree symbo..`
'(plusmn|#177)' => {'tex' => '{/Symbol \261}', 'web' => "\x{b1}"}, # +/- symbol.
'(sup2|#178)' => {'tex' => '^2', 'web' => "\x{b2}"}, # Superscript 2.
'(sup3|#179)' => {'tex' => '^3', 'web' => "\x{b3}"}, # Superscript 3.
'(acute|#180)' => {'tex' => '{/Text \222}', 'web' => "\x{b4}"}, # 'naked' acute accent.
'(micro|#181)' => {'tex' => '{/Symbol \155}', 'web' => "\x{b5}"}, # Micro (small mu).
'(para|#182)' => {'tex' => '{/Text \266}', 'web' => "\x{b6}"}, # Paragraph symbol.
'(middot|#183)' => {'tex' => '\267', 'web' => "\x{b7}"}, # middle dot
'(cedil|#184)' => {'tex' => '\233', 'web' => "\x{b8}"}, # 'naked' cedilla.
'(sup1|#185)' => {'tex' => '^1', 'web' => "\x{b9}"}, # superscript 1.
'(ordm|#186)' => {'tex' => '{\260}', 'web' => "\x{ba}"}, # masculine ordinal.
'(raquo|#187)', => {'tex' => '\273', 'web' => "\x{bb}"}, # Right angle quotes.
'(frac14|#188)' => {'tex' => '\274', 'web' => "\x{bc}"}, # 1/4.
'(frac12|#189)' => {'tex' => '\275', 'web' => "\x{bd}"}, # 1/2.
'(frac34|#190)' => {'tex' => '\276', 'web' => "\x{be}"}, # 3/4
'(iquest|#191)' => {'tex' => '{/Text \277}', 'web' => "\x{bf}"}, # Inverted ?
'(Agrave|#192)' => {'tex' => '\300', 'web' => "\x{c0}"}, # A Grave.
'(Aacute|#193)' => {'tex' => '\301', 'web' => "\x{c1}"}, # A Acute.
'(Acirc|#194)' => {'tex' => '\302', 'web' => "\x{c2}"}, # A Circumflex.
'(Atilde|#195)' => {'tex' => '\303', 'web' => "\x{c3}"}, # A tilde.
'(Auml|#196)' => {'tex' => '\304', 'web' => "\x{c4}"}, # A umlaut.
'(Aring|#197)' => {'tex' => '\305', 'web' => "\x{c5}"}, # A ring.
'(AElig|#198)' => {'tex' => '\306', 'web' => "\x{c6}"}, # AE ligature.
'(Ccedil|#199)' => {'tex' => '\307', 'web' => "\x{c7}"}, # C cedilla
'(Egrave|#200)' => {'tex' => '\310', 'web' => "\x{c8}"}, # E Accent grave.
'(Eacute|#201)' => {'tex' => '\311', 'web' => "\x{c9}"}, # E acute accent.
'(Ecirc|#202)' => {'tex' => '\312', 'web' => "\x{ca}"}, # E Circumflex.
'(Euml|#203)' => {'tex' => '\313', 'web' => "\x{cb}"}, # E umlaut.
'(Igrave|#204)' => {'tex' => '\314', 'web' => "\x{cc}"}, # I grave accent.
'(Iacute|#205)' => {'tex' => '\315', 'web' => "\x{cd}"}, # I acute accent.
'(Icirc|#206)' => {'tex' => '\316', 'web' => "\x{ce}"}, # I circumflex.
'(Iuml|#207)' => {'tex' => '\317', 'web' => "\x{cf}"}, # I umlaut.
'(ETH|#208)' => {'tex' => '\320', 'web' => "\x{d0}"}, # Icelandic Cap eth.
'(Ntilde|#209)' => {'tex' => '\321', 'web' => "\x{d1}"}, # Ntilde (enyan).
'(Ograve|#210)' => {'tex' => '\322', 'web' => "\x{d2}"}, # O accent grave.
'(Oacute|#211)' => {'tex' => '\323', 'web' => "\x{d3}"}, # O accent acute.
'(Ocirc|#212)' => {'tex' => '\324', 'web' => "\x{d4}"}, # O circumflex.
'(Otilde|#213)' => {'tex' => '\325', 'web' => "\x{d5}"}, # O tilde.
'(Ouml|#214)' => {'tex' => '\326', 'web' => "\x{d6}"}, # O umlaut.
'(times|#215)' => {'tex' => '\327', 'web' => "\x{d7}"}, # Times symbol.
'(Oslash|#216)' => {'tex' => '\330', 'web' => "\x{d8}"}, # O slash.
'(Ugrave|#217)' => {'tex' => '\331', 'web' => "\x{d9}"}, # U accent grave.
'(Uacute|#218)' => {'tex' => '\332', 'web' => "\x{da}"}, # U accent acute.
'(Ucirc|#219)' => {'tex' => '\333', 'web' => "\x{db}"}, # U circumflex.
'(Uuml|#220)' => {'tex' => '\334', 'web' => "\x{dc}"}, # U umlaut.
'(Yacute|#221)' => {'tex' => '\335', 'web' => "\x{dd}"}, # Y accent acute.
'(THORN|#222)' => {'tex' => '\336', 'web' => "\x{de}"}, # Icelandic thorn.
'(szlig|#223)' => {'tex' => '\337', 'web' => "\x{df}"}, # German sharfes s.
'(agrave|#224)' => {'tex' => '\340', 'web' => "\x{e0}"}, # a accent grave.
'(aacute|#225)' => {'tex' => '\341', 'web' => "\x{e1}"}, # a grave.
'(acirc|#226)' => {'tex' => '\342', 'web' => "\x{e2}"}, # a circumflex.
'(atilde|#227)' => {'tex' => '\343', 'web' => "\x{e3}"}, # a tilde.
'(auml|#228)' => {'tex' => '\344', 'web' => "\x{e4}"}, # a umlaut
'(aring|#229)' => {'tex' => '\345', 'web' => "\x{e5}"}, # a ring on top.
'(aelig|#230)' => {'tex' => '\346', 'web' => "\x{e6}"}, # ae ligature.
'(ccedil|#231)' => {'tex' => '\347', 'web' => "\x{e7}"}, # C cedilla
'(egrave|#232)' => {'tex' => '\350', 'web' => "\x{e8}"}, # e accent grave.
'(eacute|#233)' => {'tex' => '\351', 'web' => "\x{e9}"}, # e accent acute.
'(ecirc|#234)' => {'tex' => '\352', 'web' => "\x{ea}" }, # e circumflex.
'(euml|#235)' => {'tex' => '\353', 'web' => "\x{eb}"}, # e umlaut.
'(igrave|#236)' => {'tex' => '\354', 'web' => "\x{ec}"}, # i grave.
'(iacute|#237)' => {'tex' => '\355', 'web' => "\x{ed}"}, # i acute.
'(icirc|#238)' => {'tex' => '\356', 'web' => "\x{ee}"}, # i circumflex.
'(iuml|#239)' => {'tex' => '\357', 'web' => "\x{ef}"}, # i umlaut.
'(eth|#240)' => {'tex' => '\360', 'web' => "\x{f0}"}, # Icelandic eth.
'(ntilde|#241)' => {'tex' => '\361', 'web' => "\x{f1}"}, # n tilde.
'(ograve|#242)' => {'tex' => '\362', 'web' => "\x{f2}"}, # o grave.
'(oacute|#243)' => {'tex' => '\363', 'web' => "\x{f3}"}, # o acute.
'(ocirc|#244)' => {'tex' => '\364', 'web' => "\x{f4}"}, # o circumflex.
'(otilde|#245)' => {'tex' => '\365', 'web' => "\x{f5}"}, # o tilde.
'(ouml|#246)' => {'tex' => '\366', 'web' => "\x{f6}"}, # o umlaut.
'(divide|#247)' => {'tex' => '\367', 'web' => "\x{f7}"}, # division symbol
'(oslash|#248)' => {'tex' => '\370', 'web' => "\x{f8}"}, # o slashed.
'(ugrave|#249)' => {'tex' => '\371', 'web' => "\x{f9}"}, # u accent grave.
'(uacute|#250)' => {'tex' => '\372', 'web' => "\x{fa}"}, # u acute.
'(ucirc|#251)' => {'tex' => '\373', 'web' => "\x{fb}"}, # u circumflex.
'(uuml|#252)' => {'tex' => '\374', 'web' => "\x{fc}"}, # u umlaut.
'(yacute|#253)' => {'tex' => '\375', 'web' => "\x{fd}"}, # y acute accent.
'(thorn|#254)' => {'tex' => '\376', 'web' => "\x{fe}"}, # small thorn (icelandic).
'(yuml|#255)' => {'tex' => '\377', 'web' => "\x{ff}"}, # y umlaut.
# Latin extended A entities:
'(OElig|#338)' => {'tex' => '{/Text \326}', 'web' => "\x{152}"}, # OE ligature.
'(oelig|#339)' => {'tex' => '{/Text \366}', 'web' => "\x{153}"}, # oe ligature.
'(Scaron|#352)' => {'tex' => 'S', 'web' => "\x{160}"}, # S caron no printable.
'(scaron|#353)' => {'tex' => 's', 'web' => "\x{161}"}, # s caron no printable.
'(Yuml|#376)' => {'tex' => 'Y', 'web' => "\x{178}"}, # Y umlaut - no printable.
# Latin extended B.
'(fnof|#402)' => {'tex' =>'{/Symbol \246}', 'web' => "\x{192}"}, # f with little hook.
# Standalone accents:
'(circ|#710)' => {'tex' => '^', 'web' => '^'}, # circumflex.
'(tilde|#732)' => {'tex' => '~', 'web' => '~'}, # tilde.
# General punctuation. We're not able to make a distinction between
# the various length spacings in the print version. (e.g. en/em/thin).
# the various joiners will be empty strings in the print version too.
'(ensp|#8194)' => {'tex' => ' ', 'web' => "\x{2002}"}, # en space.
'(emsp|#8195)' => {'tex' => ' ', 'web' => "\x{2003}"}, # em space.
'(thinsp|#8201)' => {'tex' => ' ', 'web' => "\x{2009}"}, # thin space.
'(zwnj|#8204)' => {'tex' => ' ', 'web' => "\x{200c}"}, # Zero width non joiner.
'(zwj|#8205)' => {'tex' => ' ', 'web' => "\x{200d}"}, # Zero width joiner.
'(lrm|#8206)' => {'tex' => ' ', 'web' => "\x{200e}"}, # Left to right mark
'(rlm|#8207)' => {'tex' => ' ', 'web' => "\x{200f}"}, # right to left mark.
'(ndash|#8211)' => {'tex' => '{/Text \55}', 'web' => "\x{2013}"}, # en dash.
'(mdash|#8212)' => {'tex' => '{/Symbol \55}', 'web' => "\x{2014}"}, # em dash.
'(lsquo|#8216)' => {'tex' => '{/Text \140}', 'web' => "\x{2018}"}, # Left single quote.
'(rsquo|#8217)' => {'tex' => '\47', 'web' => "\x{2019}"}, # Right single quote.
'(sbquo|#8218)' => {'tex' => '\54', 'web' => "\x{201a}"}, # Single low-9 quote.
'(ldquo|#8220)' => {'tex' => '\42', 'web' => "\x{201c}"}, # Left double quote.
'(rdquo|#8221)' => {'tex' => '\42', 'web' => "\x{201d}"}, # Right double quote.
'(bdquo|#8222)' => {'tex' => ',', 'web' => "\x{201e}"}, # Double low-9 quote.
'(dagger|#8224)' => {'tex' => '+', 'web' => "\x{2020}"}, # Is this a dagger I see before me now?
'(Dagger|#8225)' => {'tex' => '\261', 'web' => "\x{2021}"}, # it's handle pointing towards my heart?
'(bull|#8226)' => {'tex' => '\267', 'web' => "\x{2022}"}, # Bullet.
'(hellep|#8230)' => {'tex' => '{/Symbol \274}', 'web' => "\x{2026}"}, # Ellipses.
'(permil|#8240)' => {'tex' => '%_o', 'web' => "\x{2031}"}, # Per mille.
'(prime|#8242)' => {'tex' => '\264', 'web' => "\x{2032}"}, # Prime.
'(Prime|#8243)' => {'tex' => '{/Symbol \262}', 'web' => "\x{2033}"}, # double prime.
'(lsaquo|#8249)' => {'tex' => '<', 'web' => "\x{2039}"}, # < quote.
'(rsaquo|#8250)' => {'tex' => '\74', 'web' => "\x{203a}"}, # > quote.
'(oline|#8254)' => {'tex' => '{/Symbol \140}', 'web' => "\x{203e}"}, # Overline.
'(frasl|#8260)' => {'tex' => '/', 'web' => "\x{2044}"}, # Fraction slash.
'(euro|#8364)' => {'tex' => '{/Symbol \240}', 'web' => "\x{20ac}"}, # Euro currency.
# Letter like symbols.
'(weierp|#8472)' => {'tex' => '{/Symbol \303}', 'web' => "\x{2118}"}, # Power set symbol
'(image|#8465)' => {'tex' => '{/Symbol \301}', 'web' => "\x{2111}"}, # Imaginary part
'(real|#8476)' => {'tex' => '{/Symbol \302}', 'web' => "\x{211c}"}, # Real part.
'(trade|#8482)' => {'tex' => '{/Symbol \344}', 'web' => "\x{2122}"}, # trademark symbol.
'(alefsym|#8501)' => {'tex' => '{/Symbol \300}', 'web' => "\x{2135}"}, # Hebrew alef.
# Arrows of various types and directions.
'(larr|#8592)' => {'tex' => '{/Symbol \254}', 'web' => "\x{2190}"}, # <--
'(uarr|#8593)' => {'tex' => '{/Symbol \255}', 'web' => "\x{2191}"}, # up arrow.
'(rarr|#8594)' => {'tex' => '{/Symbol \256}', 'web' => "\x{2192}"}, # -->
'(darr|#8595)' => {'tex' => '{/Symbol \257}', 'web' => "\x{2193}"}, # down arrow.
'(harr|#8596)' => {'tex' => '{/Symbol \253}', 'web' => "\x{2194}"}, # <-->
'(crarr|#8629)' => {'tex' => '{/Symbol \277}', 'web' => "\x{21b5}"}, # corner arrow down and right.
'(lArr|#8656)' => {'tex' => '{/Symbol \334}', 'web' => "\x{21d0}"}, # <==
'(uArr|#8657)' => {'tex' => '{/Symbol \335}', 'web' => "\x{21d1}"}, # Up double arrow.
'(rArr|#8658)' => {'tex' => '{/Symbol \336}', 'web' => "\x{21d2}"}, # ==>
'(dArr|#8659)' => {'tex' => '{/Symbol \337}', 'web' => "\x{21d3}"}, # Down double arrow.
'(hArr|#8660)' => {'tex' => '{/Symbol \333}', 'web' => "\x{21d4}"}, # <==>
# Mathematical operators. For some of these we do the best we can in printing.
'(forall|#8704)' => {'tex' => '{/Symbol \42}', 'web' => "\x{2200}"}, # For all.
'(part|#8706)' => {'tex' => '{/Symbol d}', 'web' => "\x{2202}"}, # partial derivative
'(exist|#8707)' => {'tex' => '{/Symbol \44}', 'web' => "\x{2203}"}, # There exists.
'(empty|#8709)' => {'tex' => '{/Symbol \306}', 'web' => "\x{2205}"}, # Null set.
'(nabla|#8711)' => {'tex' => '{/Symbol \321}', 'web' => "\x{2207}"}, # Gradient e.g.
'(isin|#8712)' => {'tex' => '{/Symbol \316}', 'web' => "\x{2208}"}, # Element of the set.
'(notin|#8713)' => {'tex' => '{/Symbol \317}', 'web' => "\x{2209}"}, # Not an element of
'(ni|#8715)' => {'tex' => '{/Symbol \47}', 'web' => "\x{220b}"}, # Contains as a member
'(prod|#8719)' => {'tex' => '{/Symbol \325}', 'web' => "\x{220f}"}, # Product
'(sum|#8721)' => {'tex' => '{/Symbol \345}', 'web' => "\x{2211}"}, # Sum of.
'(minus|#8722)' => {'tex' => '{/Symbol \55}', 'web' => "\x{2212}"}, # - sign.
'(lowast|#8727)' => {'tex' => '*', 'web' => "\x{2217}"}, # *
'(radic|#8730)' => {'tex' => '{/Symbol \326}', 'web' => "\x{221a}"}, # Square root.
'(prop|#8733)' => {'tex' => '{/Symbol \265}', 'web' => "\x{221d}"}, # Proportional to.
'(infin|#8734)' => {'tex' => '{/Symbol \245}', 'web' => "\x{221e}"}, # Infinity.
'(ang|#8736)' => {'tex' => '{/Symbol \320}', 'web' => "\x{2220}"}, # Angle .
'(and|#8743)' => {'tex' => '{/Symbol \331}', 'web' => "\x{2227}"}, # Logical and.
'(or|#8744)' => {'tex' => '{/Symbol \332}', 'web' => "\x{2228}"}, # Logical or.
'(cap|#8745)' => {'tex' => '{/Symbol \307}', 'web' => "\x{2229}"}, # Set intersection.
'(cup|#8746)' => {'tex' => '{/Symbol \310}', 'web' => "\x{222a}"}, # Set union.
'(int|8747)' => {'tex' => '{/Symbol \362}', 'web' => "\x{222b}"}, # Integral.
# Some gnuplot guru will have to explain to me why the next three
# require the extra slashes... else they print very funkily.
'(there4|#8756)' => {'tex' => '{/Symbol \\\134}', 'web' => "\x{2234}"}, # Therefore triple dots.
'(sim|#8764)' => {'tex' => '\\\176', 'web' => "\x{223c}"}, # Simlar to.
'(cong|#8773)' => {'tex' => '{/Symbol \\\100}','web' => "\x{2245}"}, # Congruent to/with.
'(asymp|#8776)' => {'tex' => '{/Symbol \273}', 'web' => "\x{2248}"}, # Asymptotic to.
'(ne|#8800)' => {'tex' => '{/Symbol \271}', 'web' => "\x{2260}"}, # not equal to.
'(equiv|#8801)' => {'tex' => '{/Symbol \272}', 'web' => "\x{2261}"}, # Equivalent to.
'(le|8804)' => {'tex' => '{/Symbol \243}', 'web' => "\x{2264}"}, # Less than or equal to.
'(ge|8805)' => {'tex' => '{/Symbol \263}', 'web' => "\x{2265}"}, # Greater than or equal to
'(sub|8834)' => {'tex' => '{/Symbol \314}', 'web' => "\x{2282}"}, # Subset of.
'(sup|8835)' => {'tex' => '{/Symbol \311}', 'web' => "\x{2283}"}, # Super set of.
'(nsub|8836)' => {'tex' => '{/Symbol \313}', 'web' => "\x{2284}"}, # not subset of.
'(sube|8838)' => {'tex' => '{/Symbol \315}', 'web' => "\x{2286}"}, # Subset or equal.
'(supe|8839)' => {'tex' => '{/Symbol \312}', 'web' => "\x{2287}"}, # Superset or equal
'(oplus|8853)' => {'tex' => '{/Symbol \305}', 'web' => "\x{2295}"}, # O with plus inside
'(otimes|8855)' => {'tex' => '{/Symbol \304}', 'web' => "\x{2297}"}, # O with times.
'(perp|8869)' => {'tex' => '{/Symbol \136}', 'web' => "\x{22a5}"}, # Perpendicular.
'(sdot|8901)' => {'tex' => '{/Symbol \227}', 'web' => "\x{22c5}"}, # Dot operator.
# Misc. technical symbols:
'(lceil|8698)' => {'tex' => '{/Symbol \351}', 'web' => "\x{2308}"}, # Left ceiling.
'(rceil|8969)' => {'tex' => '{/Symbol \371}', 'web' => "\x{2309}"}, # Right ceiling.
'(lfloor|8970)' => {'tex' => '{/Symbol \353}', 'web' => "\x{230a}"}, # Left floor.
'(rfloor|8971)' => {'tex' => '{/Symbol \373}', 'web' => "\x{230b}"}, # Right floor.
# The gnuplot png font evidently does not have the big angle brackets at
# positions 0x2329, 0x232a so use ordinary brackets.
'(lang|9001)' => {'tex' => '{/Symbol \341}', 'web' => '<'}, # Left angle bracket.
'(rang|9002)' => {'tex' => '{/Symbol \361}', 'web' => '>'}, # Right angle bracket.
# Gemoetric shapes.
'(loz|9674)' => {'tex' => '{/Symbol \340}', 'web' => "\x{25ca}"}, # Lozenge.
# Misc. symbols
'(spades|9824)' => {'tex' => '{/Symbol \252}', 'web' => "\x{2660}"},
'(clubs|9827)' => {'tex' => '{/Symbol \247}', 'web' => "\x{2663}"},
'(hearts|9829)' => {'tex' => '{/Symbol \251}', 'web' => "\x{2665}"},
'(diams|9830)' => {'tex' => '{/Symbol \250}', 'web' => "\x{2666}"}
);
sub replace_entities {
my ($target,$text) = @_;
$text =~ s{([_^~\{\}]|\\\\)}{\\\\$1}g;
while (my ($re, $replace) = each(%lookup)) {
my $repl = $replace->{$target};
$text =~ s/&$re;/$replace->{$target}/g;
}
$text =~ s{(&)}{\\\\$1}g;
return $text;
}
##------------------------------------------------------------------- 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);
}
$title = &parse_label($target,$title);
} elsif ($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,$$parstack[-1]);
$xlabel =~ s/\n/ /g;
if (length($xlabel) > $max_str_len) {
$xlabel = substr($xlabel,0,$max_str_len);
}
$xlabel = &parse_label($target,$xlabel);
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
my $text=&Apache::lonxml::get_all_text("/xlabel",$parser,$style);
$result.=&Apache::edit::editline('',$text,'',60);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield("/xlabel",$parser);
}
return $result;
}
sub end_xlabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web' || $target eq 'tex') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- ylabel
sub start_ylabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web' || $target eq 'tex') {
$ylabel = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
$ylabel = &Apache::run::evaluate($ylabel,$safeeval,$$parstack[-1]);
$ylabel =~ s/\n/ /g;
if (length($ylabel) > $max_str_len) {
$ylabel = substr($ylabel,0,$max_str_len);
}
$ylabel = &parse_label($target,$ylabel);
} elsif ($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'} = &parse_label($target,$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') {
&fixup_colors($token);
$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));
my $fixed = &fixup_colors($token);
if ($constructtag || $fixed) {
$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]);
$function=~s/\^/\*\*/gs;
$function=~ s/^\s+//; # Trim leading
$function=~ s/\s+$//; # And trailing whitespace.
$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') {
&fixup_colors($token);
$result .= &Apache::edit::tag_start($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));
my $fixed = &fixup_colors($token);
if ($constructtag || $fixed) {
$result = &Apache::edit::rebuild_tag($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})) {
my $warning = &mt('Replacing your value with: [_1].',
$defaults->{$attr}->{'default'});
my $missingprefix;
if (($env{'form.problemmode'} eq 'editxml') ||
($env{'form.problemmode'} eq 'edit')) {
$warning = &mt('On display your value will be replaced with: [_1].',
$defaults->{$attr}->{'default'});
if (($env{'form.problemmode'} eq 'edit') &&
($attr =~ /^(|fg|bg)color$/) && ($values->{$attr} =~ /^[\da-fA-F]{6}$/)) {
$missingprefix = 1;
$warning = &mt('The current value is missing the prefix: [_1].',
$colorprefix).' '.
&mt('As the color picker entry adds the prefix, saving will fix this issue.');
}
}
unless ($missingprefix) {
$values->{$attr} = $defaults->{$attr}->{'default'};
}
&Apache::lonxml::warning
($tag.':'.$attr.': '.&mt('Bad value').'. '.$warning);
}
}
return ;
}
##
# Generate tic mark specifications.
#
# @param type - type of tics (xtics or ytics).
# @param spec - Reference to a hash that contains the tic specification.
# @param target - 'tex' if hard copy target.
#
# @return string - the tic specification command.
#
sub generate_tics {
my ($type, $spec, $target) = @_;
my $result = '';
if ((ref($spec) eq 'HASH') && (keys(%{$spec}) > 0)) {
# Major tics: - If there are 'ticspecs' these override any other
# specifications:
$result .= "set $type $spec->{'location'} ";
$result .= ($spec->{'mirror'} eq 'on') ? 'mirror ' : 'nomirror ';
if ($spec->{'rotate'} eq 'on') {
$result .= ' rotate ';
}
if (defined $spec->{'ticspecs'}) {
$result .= '( ';
my @ticspecs;
my $ticinfo = $spec->{'ticspecs'};
foreach my $tic (@$ticinfo) {
push(@ticspecs, '"' . $tic->{'label'} . '" ' . $tic->{'pos'} );
}
$result .= join(', ', (@ticspecs));
$result .= ' )';
} else {
$result .= "$spec->{'start'}, ";
$result .= "$spec->{'increment'}, ";
$result .= "$spec->{'end'} ";
}
if ($target eq 'tex' ) {
$result .= 'font "Helvetica,22"';
}
$result .= "\n";
# minor frequency:
if ($spec->{'minorfreq'} != 0) {
$result .= "set m$type $spec->{'minorfreq'}\n";
}
} elsif ($target eq 'tex' ) {
$result .= "set $type font " . '"Helvetica,22"' ."\n";
}
return $result;
}
##------------------------------------------------------- write_gnuplot_file
sub write_gnuplot_file {
my ($tmpdir,$filename,$target)= @_;
my ($fontsize, $font_properties) = &get_font($target);
my $gnuplot_input = '';
my $curve;
#
# 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;
if ($version < 4.6) {
push(@Colors,$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 terminal png enhanced nocrop ';
$gnuplot_input .= 'transparent ' if ($Apache::lonplot::plot{'transparent'} eq 'on');
$gnuplot_input .= 'font "'.$Apache::lonnet::perlvar{'lonFontsDir'}.
'/'.$font_properties->{'file'}.'.ttf" ';
$gnuplot_input .= $fontsize;
$gnuplot_input .= ' size '.$Apache::lonplot::plot{'width'}.','.$Apache::lonplot::plot{'height'}.' ';
if ($version >= 4.6) {
if ($Apache::lonplot::plot{'bgcolor'}) {
$gnuplot_input .= "background '$Apache::lonplot::plot{'bgcolor'}'\n";
}
} else {
$gnuplot_input .= "@Colors\n";
}
# set output
$gnuplot_input .= "set output\n";
} elsif ($target eq 'tex') {
$gnuplot_input .= "set term postscript eps enhanced $Apache::lonplot::plot{'plotcolor'} dash ";
if (!$font_properties->{'tex_no_file'}) {
$gnuplot_input .=
'fontfile "'.$Apache::lonnet::perlvar{'lonFontsDir'}.
'/'.$font_properties->{'file'}.'.pfb" ';
}
if (($version >= 4.6) && ($Apache::lonplot::plot{'plotcolor'} =~ /^colou?r$/) &&
($Apache::lonplot::plot{'bgcolor'} ne '')) {
$gnuplot_input .= "background '$Apache::lonplot::plot{'bgcolor'}' ";
}
$gnuplot_input .= ' "'.$font_properties->{'printname'}.'" ';
$gnuplot_input .= $fontsize;
$gnuplot_input .= "\nset output \"".$tmpdir.
&unescape($filename).".eps\"\n";
$gnuplot_input .= "set encoding iso_8859_1\n"; # Get access to extended font.
}
$gnuplot_input .= "set encoding utf8\n";
# cartesian or polar plot?
if (lc($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') {
$gnuplot_input .= 'set grid polar'.$/;
} elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'linear-log') {
$gnuplot_input .= 'set logscale x'.$/;
} elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'log-linear') {
$gnuplot_input .= 'set logscale y'.$/;
} elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'log-log') {
$gnuplot_input .= 'set logscale x'.$/;
$gnuplot_input .= 'set logscale y'.$/;
} 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'}.$/;
}
# tic scales
if ($version > 4) {
$gnuplot_input .= 'set tics scale '.
$Apache::lonplot::plot{'major_ticscale'}.', '.$Apache::lonplot::plot{'minor_ticscale'}.$/;
} else {
$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 ($Apache::lonplot::plot{'gridlayer'} eq 'on');
# grid
if ($Apache::lonplot::plot{'grid'} eq 'on') {
if (($version >= 4.6) && (($axis{'color'} ne '') || ($Apache::lonplot::plot{'fgcolor'} ne ''))) {
if (($target eq 'web') || (($target eq 'tex') &&
($Apache::lonplot::plot{'plotcolor'} =~ /^colou?r$/))) {
$gnuplot_input .= 'set grid linecolor rgb "'.
(($axis{'color'} ne '')?$axis{'color'}:
$Apache::lonplot::plot{'fgcolor'}).
'" '.$/;
} else {
$gnuplot_input .= 'set grid'.$/;
}
} else {
$gnuplot_input .= 'set grid'.$/;
}
}
# border
if ($Apache::lonplot::plot{'border'} eq 'on') {
if (($version >= 4.6) && ($Apache::lonplot::plot{'fgcolor'} ne '')) {
if (($target eq 'web') || (($target eq 'tex') &&
($Apache::lonplot::plot{'plotcolor'} =~ /^colou?r$/))) {
$gnuplot_input .= 'set border linecolor rgb "'.
$Apache::lonplot::plot{'fgcolor'}.'" '.$/;
} else {
$gnuplot_input .= 'set border '.$/;
}
} else {
$gnuplot_input .= 'set border '.$/;
}
} else {
$gnuplot_input .= 'set noborder '.$/;
}
# sampling rate for non-data curves
$gnuplot_input .= "set samples $Apache::lonplot::plot{'samples'}\n";
# title, xlabel, ylabel
# titles
my $extra_space_x = ($xtics{'location'} eq 'axis') ? ' offset 0, -0.5 ' : '';
my $extra_space_y = ($ytics{'location'} eq 'axis') ? ' offset -0.5, 0 ' : '';
if ($target eq 'tex') {
$gnuplot_input .= "set title \"$title\" font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($title)) ;
$gnuplot_input .= "set xlabel \"$xlabel\" $extra_space_x font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($xlabel));
$gnuplot_input .= "set ylabel \"$ylabel\" $extra_space_y font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($ylabel));
} else {
$gnuplot_input .= "set title \"$title\" \n" if (defined($title)) ;
$gnuplot_input .= "set xlabel \"$xlabel\" $extra_space_x \n" if (defined($xlabel));
$gnuplot_input .= "set ylabel \"$ylabel\" $extra_space_y \n" if (defined($ylabel));
}
# tics
$gnuplot_input .= &generate_tics('xtics', \%xtics, $target);
$gnuplot_input .= &generate_tics('ytics', \%ytics, $target);
# axis
if (%axis) {
if ($axis{'xformat'} ne 'on') {
$gnuplot_input .= "set format x ";
if ($axis{'xformat'} eq 'off') {
$gnuplot_input .= "\"\"\n";
} else {
if ($axis{'xformat'} =~ /^(\d+P\s*)[Pp][Ii]/) {
my $xprefix = $1;
if (($target eq 'web') || ($target eq 'tex')) {
$axis{'xformat'} = $xprefix.$lookup{'(pi|#960)'}{$target};
} else {
$axis{'xformat'} = $xprefix;
}
}
$gnuplot_input .= "\"\%.".$axis{'xformat'}."\"\n";
}
}
if ($axis{'yformat'} ne 'on') {
$gnuplot_input .= "set format y ";
if ($axis{'yformat'} eq 'off') {
$gnuplot_input .= "\"\"\n";
} else {
if ($axis{'yformat'} =~ /^(\d+P\s*)[Pp][Ii]/) {
my $yprefix = $1;
if (($target eq 'web') || ($target eq 'tex')) {
$axis{'yformat'} = $yprefix.$lookup{'(pi|#960)'}{$target};
} else {
$axis{'yformat'} = $yprefix;
}
}
$gnuplot_input .= "\"\%.".$axis{'yformat'}."\"\n";
}
}
$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
if ($axis{'xzero'} ne 'off') {
$gnuplot_input .= "set xzeroaxis ";
if ($axis{'xzero'} eq 'line' || $axis{'xzero'} eq 'thick-line') {
$gnuplot_input .= "lt -1 ";
if ($axis{'xzero'} eq 'thick-line') {
$gnuplot_input .= "lw 3 ";
}
}
$gnuplot_input .= "\n";
}
if ($axis{'yzero'} ne 'off') {
$gnuplot_input .= "set yzeroaxis ";
if ($axis{'yzero'} eq 'line' || $axis{'yzero'} eq 'thick-line') {
$gnuplot_input .= "lt -1 ";
if ($axis{'yzero'} eq 'thick-line') {
$gnuplot_input .= "lw 3 ";
}
}
$gnuplot_input .= "\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'};
if ($label->{'rotate'} ne '') {
$gnuplot_input .= ' rotate by '.$label->{'rotate'};
}
$gnuplot_input .= ' '.$label->{'justify'};
if ($target eq 'tex') {
$gnuplot_input .=' font "'.$font_properties->{'printname'}.','.$fontsize.'pt"';
}
if (($label->{'zlayer'} eq 'front') || ($label->{'zlayer'} eq 'back')) {
$gnuplot_input .= ' '.$label->{'zlayer'};
}
$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
#
# Each curve will have its very own linestyle.
# (This should work just fine in web rendition I think).
# The line_xxx variables will hold the elements of the line style.
# type (solid/dashed), color, width
#
my $linestyle_index = 50;
my $line_width = '';
my $plots = '';
# If arrows are needed there will be an arrow style for each as well:
#
my $arrow_style_index = 50;
for (my $i = 0;$i<=$#curves;$i++) {
$curve = $curves[$i];
my $plot_command = '';
my $plot_type = '';
if ($i > 0) {
$plot_type = ', ';
}
if ($target eq 'tex') {
$curve->{'linewidth'} *= 2;
}
$line_width = $curve->{'linewidth'};
if (exists($curve->{'function'})) {
$plot_type .=
$curve->{'function'}.' title "'.
$curve->{'name'}.'" with '.
$curve->{'linestyle'};
} elsif (exists($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
$plot_type .= '"'.$datafilename.'" title "'.
$curve->{'name'}.'" with '.
$curve->{'linestyle'};
}
my $pointtype = '';
my $pointsize = '';
# Figure out the linestyle:
my $lt = $curve->{'linetype'} ne '' ? $curve->{'linetype'}
: 'solid'; # Line type defaults to solid.
# The mapping of lt -> the actual gnuplot line type depends on the target:
if ($target eq 'tex') {
$lt = $ps_linetypes{$lt};
} else {
$lt = $linetypes{$lt}
}
my $color = $curve->{'color'};
$color =~ s/^x/#/; # Convert xhex color -> #hex color.
if (($curve->{'linestyle'} eq 'points') ||
($curve->{'linestyle'} eq 'linespoints') ||
($curve->{'linestyle'} eq 'errorbars') ||
($curve->{'linestyle'} eq 'xerrorbars') ||
($curve->{'linestyle'} eq 'yerrorbars') ||
($curve->{'linestyle'} eq 'xyerrorbars')) {
$pointtype =' pointtype '.$curve->{'pointtype'};
$pointsize =' pointsize '.$curve->{'pointsize'};
} elsif ($curve->{'linestyle'} eq 'filledcurves') {
$plot_command.= ' '.$curve->{'limit'};
} elsif ($curve->{'linestyle'} eq 'vector') {
# Create the arrow head style add it to
# $gnuplot_input..and ensure it gets
# Selected in the plot command.
$gnuplot_input .= "set style arrow $arrow_style_index ";
$gnuplot_input .= ' ' . $curve->{'arrowhead'};
$gnuplot_input .= ' size ' . $curve->{'arrowlength'};
$gnuplot_input .= ','.$curve->{'arrowangle'};
$gnuplot_input .= ',' . $curve->{'arrowbackangle'};
$gnuplot_input .= ' ' . $curve->{'arrowstyle'} . " ls $linestyle_index\n";
$plot_command .= " arrowstyle $arrow_style_index ";
$arrow_style_index++;
}
my $style_command = "set style line $linestyle_index $pointtype $pointsize linetype $lt linewidth $line_width lc rgb '$color'\n";
$gnuplot_input .= $style_command;
# The condition below is because gnuplot lumps the linestyle in with the
# arrowstyle _sigh_.
if ($curve->{'linestyle'} ne 'vector') {
$plot_command.= " ls $linestyle_index";
}
$plots .= $plot_type . ' ' . $plot_command;
$linestyle_index++; # Each curve get a unique linestyle.
}
$gnuplot_input .= 'plot '.$plots;
# Write the output to a file.
# &Apache::lonnet::logthis($gnuplot_input); # uncomment to log the gnuplot input.
open (my $fh, "> $tmpdir$filename.data");
binmode($fh, ':utf8');
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($curve->{'data'})){
&Apache::lonxml::warning("One of the curves specified did not contain any curve data or curve function declarations\n");
return '';
}
}
}
#------------------------------------------ edit_attributes
sub edit_attributes {
my ($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'},
$defaults->{$attr}->{'class'});
} 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 $result;
}
#------------------------------------------ fixup_colors
sub fixup_colors {
my ($token,$attribref) = @_;
my @attributes;
if (ref($attribref) eq 'ARRAY') {
@attributes = @{$attribref};
} else {
@attributes = ('color');
}
#
# Fix up the color attribute since jchooser does not
# prepend an x (or #) to the color:
#
my $had_changes;
if ((ref($token) eq 'ARRAY') && (ref($token->[2]) eq 'HASH')) {
foreach my $attribute (@attributes) {
if ($attribute =~ /^(|bg|fg)color$/) {
my $value = $token->[2]{$attribute};
if (defined($value)) {
if ($version < 4.6) {
$value=~s/^\#/x/;
} else {
$value=~s/^x/#/;
}
if ($value ne $token->[2]{$attribute}) {
$token->[2]{$attribute} = $value;
$had_changes = 1;
}
if ($value !~ /^\Q$colorprefix\E/) {
$token->[2]{$attribute} = $colorprefix . $value;
$had_changes = 1;
}
}
}
}
}
return $had_changes;
}
###################################################################
## ##
## 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__
=head1 NAME
Apache::lonplot.pm
=head1 SYNOPSIS
XML-based plotter of graphs
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 SUBROUTINES (parsing and edit rendering)
=over
=item start_gnuplot()
=item end_gnuplot()
=item start_xtics()
=item end_xtics()
=item start_ytics()
=item end_ytics()
=item get_font()
=item start_key()
=item end_key()
=item parse_label()
=item replace_entities()
=item start_title()
=item end_title()
=item start_xlabel()
=item end_xlabel()
=item start_ylabel()
=item end_label()
=item start_curve()
=item end_curve()
=item start_function()
=item end_function()
=item start_data()
=item end_data()
=item start_axis()
=item end_axis
=back
=head1 SUBROUTINES (Utility)
=over
=item set_defaults()
=item get_attributes()
=item write_gnuplot_file()
=item check_inputs()
=item edit_attributes()
=item fixup_colors()
=back
=head1 SUBROUTINES (Insertion functions for editing plots)
=over
=item insert_gnuplot()
=item insert_tics()
=item insert_xtics()
=item insert_key()
=item insert_axis()
=item insert_title()
=item insert_xlabel()
=item insert_ylabel()
=item insert_label()
=item insert_curve()
=item insert_function()
=item insert_data()
=back
=cut
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