# The LearningOnline Network with CAPA
# Dynamic plot
#
# $Id: lonplot.pm,v 1.42 2002/01/21 16:41:31 matthew 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/
#
# 12/15/01 Matthew
# 12/17 12/18 12/19 12/20 12/21 12/27 12/28 12/30 12/31 Matthew
# 01/01/02 Matthew
# 01/02 01/03 01/04 01/07 01/08 01/09 Matthew
# 01/21 Matthew
package Apache::lonplot;
use strict;
use Apache::File;
use Apache::response;
use Apache::lonxml;
use Apache::edit;
BEGIN {
&Apache::lonxml::register('Apache::lonplot',('plot'));
}
##
## 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,
# boxerrorbars => [3,4,5],
# boxxyerrorbars => [4,6,7],
# financebars => 5,
# candlesticks => 5,
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 $color_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-f]{6}$/};
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 @plot_edit_order =
qw/bgcolor fgcolor height width font transparent grid border align/;
my %plot_defaults =
(
height => {
default => 200,
test => $int_test,
description => 'height of image (pixels)',
edit_type => 'entry',
size => '10'
},
width => {
default => 200,
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 => 'on_off'
},
grid => {
default => 'off',
test => $onoff_test,
description => 'Display grid',
edit_type => 'on_off'
},
border => {
default => 'on',
test => $onoff_test,
description => 'Draw border around plot',
edit_type => 'on_off'
},
font => {
default => 'medium',
test => $sml_test,
description => 'Size of font to use',
edit_type => 'choice',
choices => ['small','medium','large']
},
align => {
default => 'left',
test => sub {$_[0]=~/^(left|right|center)$/},
description => 'alignment for image in html',
edit_type => 'choice',
choices => ['left','right','center']
}
);
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 => 'on_off'
},
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 %axis_defaults =
(
color => {
default => 'x000000',
test => $color_test,
description => 'color of axes (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_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 => $linestyle_test,
description => 'Line style',
edit_type => 'choice',
choices => [keys(%linestyles)]
}
);
###################################################################
## ##
## parsing and edit rendering ##
## ##
###################################################################
my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves);
sub start_plot {
%plot = (); %key = (); %axis = ();
$title = undef; $xlabel = undef; $ylabel = undef;
$#labels = -1; $#curves = -1;
#
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
&Apache::lonxml::register('Apache::lonplot',
('title','xlabel','ylabel','key','axis','label','curve'));
push (@Apache::lonxml::namespace,'lonplot');
if ($target eq 'web') {
my $inside = &Apache::lonxml::get_all_text("/plot",$$parser[-1]);
$inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
&Apache::lonxml::newparser($parser,\$inside);
&get_attributes(\%plot,\%plot_defaults,$parstack,$safeeval,
$tagstack->[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Plot');
$result .= &edit_attributes($target,$token,\%plot_defaults,
\@plot_edit_order);
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%plot_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_plot {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
pop @Apache::lonxml::namespace;
&Apache::lonxml::deregister('Apache::lonplot',
('title','xlabel','ylabel','key','axis','label','curve'));
my $result = '';
if ($target eq 'web') {
&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.'_'.$$.int(rand(1000)).'_plot.data';
## Write the plot description to the file
&write_gnuplot_file($tmpdir,$filename);
## return image tag for the plot
$result .= <<"ENDIMAGE";
<img src = "/cgi-bin/plot.gif?$filename"
width = "$plot{'width'}"
height = "$plot{'height'}"
align = "$plot{'align'}"
alt = "/cgi-bin/plot.gif?$filename" />
ENDIMAGE
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##----------------------------------------------------------------- key
sub start_key {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web') {
&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
$tagstack->[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Plot Key');
$result .= &edit_attributes($target,$token,\%key_defaults);
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%key_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
}
}
return $result;
}
sub end_key {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- title
sub start_title {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web') {
$title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
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",$$parser[-1]);
$result.=&Apache::edit::end_row().
&Apache::edit::start_spanning_row().
&Apache::edit::editfield('',$text,'',60,1);
} elsif ($target eq 'modified') {
my $text=$$parser[-1]->get_text("/title");
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield($token);
}
return $result;
}
sub end_title {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web') {
} 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') {
$xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
if (length($xlabel) > $max_str_len) {
$xlabel = substr($xlabel,0,$max_str_len);
}
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
my $text=&Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
$result.=&Apache::edit::end_row().
&Apache::edit::start_spanning_row().
&Apache::edit::editfield('',$text,'',60,1);
} elsif ($target eq 'modified') {
my $text=$$parser[-1]->get_text("/xlabel");
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield($token);
}
return $result;
}
sub end_xlabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- ylabel
sub start_ylabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web') {
$ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
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",$$parser[-1]);
$result .= &Apache::edit::end_row().
&Apache::edit::start_spanning_row().
&Apache::edit::editfield('',$text,'',60,1);
} elsif ($target eq 'modified') {
my $text=$$parser[-1]->get_text("/ylabel");
$result.=&Apache::edit::rebuild_tag($token);
$result.=&Apache::edit::modifiedfield($token);
}
return $result;
}
sub end_ylabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web') {
} 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') {
my %label;
&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
$tagstack->[-1]);
my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
$text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
$label{'text'} = $text;
push(@labels,\%label);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Plot Label');
$result .= &edit_attributes($target,$token,\%label_defaults);
my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
$result .= &Apache::edit::end_row().
&Apache::edit::start_spanning_row().
&Apache::edit::editfield('',$text,'',60,1);
} elsif ($target eq 'modified') {
&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%label_defaults));
$result.=&Apache::edit::rebuild_tag($token);
my $text=$$parser[-1]->get_text("/label");
$result.=&Apache::edit::modifiedfield($token);
}
return $result;
}
sub end_label {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------------- curve
sub start_curve {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
&Apache::lonxml::register('Apache::lonplot',('function','data'));
push (@Apache::lonxml::namespace,'curve');
if ($target eq 'web') {
my %curve;
&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
$tagstack->[-1]);
push (@curves,\%curve);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Curve');
$result .= &edit_attributes($target,$token,\%curve_defaults);
} elsif ($target eq 'modified') {
my $constructtag=&Apache::edit::get_new_args
($token,$parstack,$safeeval,keys(%curve_defaults));
if ($constructtag) {
$result = &Apache::edit::rebuild_tag($token);
$result.= &Apache::edit::handle_insert();
}
}
return $result;
}
sub end_curve {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
pop @Apache::lonxml::namespace;
&Apache::lonxml::deregister('Apache::lonplot',('function','data'));
if ($target eq 'web') {
} elsif ($target eq 'edit') {
$result.=&Apache::edit::tag_end($target,$token);
}
return $result;
}
##------------------------------------------------------------ curve function
sub start_function {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
if ($target eq 'web') {
if (exists($curves[-1]->{'data'})) {
&Apache::lonxml::warning('Use of <function> precludes use of <data>. The <data> will be omitted in favor of the <function> declaration.');
delete $curves[-1]->{'data'} ;
}
$curves[-1]->{'function'} =
&Apache::lonxml::get_all_text("/function",$$parser[-1]);
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
my $text = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
$result .= &Apache::edit::end_row().
&Apache::edit::start_spanning_row().
&Apache::edit::editfield('',$text,'',60,1);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
my $text=$$parser[-1]->get_text("/function");
$result.=&Apache::edit::modifiedfield($token);
}
return $result;
}
sub end_function {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web') {
} 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') {
if (exists($curves[-1]->{'function'})) {
&Apache::lonxml::warning('Use of <data> precludes use of .'.
'<function>. The <function> will be omitted in favor of '.
'the <data> declaration.');
delete($curves[-1]->{'function'});
}
my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
# Deal with cases where we're given an array...
if ($datatext =~ /^\@/) {
$datatext = &Apache::run::run('return "'.$datatext.'"',
$safeeval,1);
}
$datatext =~ s/\s+/ /g;
# Need to do some error checking on the @data array -
# make sure it's all numbers and make sure each array
# is of the same length.
my @data;
if ($datatext =~ /,/) { # comma deliminated
@data = split /,/,$datatext;
} else { # Assume it's space seperated.
@data = split / /,$datatext;
}
for (my $i=0;$i<=$#data;$i++) {
# Check that it's non-empty
if (! defined($data[$i])) {
&Apache::lonxml::warning(
'undefined <data> value. Replacing with '.
' pi/e = 1.15572734979092');
$data[$i] = 1.15572734979092;
}
# Check that it's a number
if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
&Apache::lonxml::warning(
'Bad <data> value of '.$data[$i].' Replacing with '.
' pi/e = 1.15572734979092');
$data[$i] = 1.15572734979092;
}
}
# complain if the number of data points is not the same as
# in previous sets of data.
if (($curves[-1]->{'data'}) && ($#data != $#{@{$curves[-1]->{'data'}->[0]}})){
&Apache::lonxml::warning
('Number of data points is not consistent with previous '.
'number of data points');
}
push @{$curves[-1]->{'data'}},\@data;
} elsif ($target eq 'edit') {
$result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
my $text = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
$result .= &Apache::edit::end_row().
&Apache::edit::start_spanning_row().
&Apache::edit::editfield('',$text,'',60,1);
} elsif ($target eq 'modified') {
$result.=&Apache::edit::rebuild_tag($token);
my $text=$$parser[-1]->get_text("/data");
$result.=&Apache::edit::modifiedfield($token);
}
return $result;
}
sub end_data {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';
if ($target eq 'web') {
} 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') {
&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,$token,\%axis_defaults);
} elsif ($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') {
} 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})) {
$values->{$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)= @_;
my $gnuplot_input = '';
my $curve;
# Collect all the colors
my @Colors;
push @Colors, $plot{'bgcolor'};
push @Colors, $plot{'fgcolor'};
push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
foreach $curve (@curves) {
push @Colors, ($curve->{'color'} ne '' ?
$curve->{'color'} :
$plot{'fgcolor'} );
}
# set term
$gnuplot_input .= 'set term gif ';
$gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');
$gnuplot_input .= $plot{'font'} . ' ';
$gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';
$gnuplot_input .= "@Colors\n";
# grid
$gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');
# border
$gnuplot_input .= ($plot{'border'} eq 'on'?
'set border'.$/ :
'set noborder'.$/ ); # title, xlabel, ylabel
$gnuplot_input .= "set output\n";
$gnuplot_input .= "set title \"$title\"\n" if (defined($title)) ;
$gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
$gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
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'}.' '.$label->{'justify'}.$/ ;
}
# 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 '.
$curve->{'linestyle'};
} elsif (exists($curve->{'data'})) {
# Store data values in $datatext
my $datatext = '';
# get new filename
my $datafilename = "$tmpdir/$filename.$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'};
}
}
# Write the output to a file.
my $fh=Apache::File->new(">$tmpdir$filename");
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 (! %plot) { &set_defaults(\%plot,\%plot_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($curve->{'data'})){
&Apache::lonxml::warning("One of the curves specified did not contain any <data> or <function> declarations\n");
return '';
}
}
}
#------------------------------------------------ make_edit
sub edit_attributes {
my ($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') {
$result .= &Apache::edit::select_arg
($description,$attr,$defaults->{$attr}->{'choices'},$token);
} elsif ($defaults->{$attr}->{'edit_type'} eq 'on_off') {
$result .= &Apache::edit::select_arg
($description,$attr,['on','off'],$token);
}
$result .= '<br />';
}
return $result;
}
###################################################################
## ##
## Insertion functions for editing plots ##
## ##
###################################################################
#------------------------------------------------ insert_xxxxxxx
sub insert_plot {
my $result = '';
# plot attributes
$result .= "<plot \n";
foreach my $attr (keys(%plot_defaults)) {
$result .= " $attr=\"$plot_defaults{$attr}->{'default'}\"\n";
}
$result .= ">\n";
# Add the components
$result .= &insert_key();
$result .= &insert_axis();
$result .= &insert_title();
$result .= &insert_xlabel();
$result .= &insert_ylabel();
$result .= &insert_curve();
# close up the <plot>
$result .= "</plot>\n";
return $result;
}
sub insert_key {
my $result;
$result .= " <key \n";
foreach my $attr (keys(%key_defaults)) {
$result .= " $attr=\"$key_defaults{$attr}->{'default'}\"\n";
}
$result .= " />\n";
return $result;
}
sub insert_axis{
my $result;
$result .= ' <axis ';
foreach my $attr (keys(%axis_defaults)) {
$result .= " $attr=\"$axis_defaults{$attr}->{'default'}\"\n";
}
$result .= " />\n";
return $result;
}
sub insert_title { return " <title></title>\n"; }
sub insert_xlabel { return " <xlabel></xlabel>\n"; }
sub insert_ylabel { return " <ylabel></ylabel>\n"; }
sub insert_label {
my $result;
$result .= ' <label ';
foreach my $attr (keys(%label_defaults)) {
$result .= ' '.$attr.'="'.
$label_defaults{$attr}->{'default'}."\"\n";
}
$result .= " ></label>\n";
return $result;
}
sub insert_curve {
my $result;
$result .= "\n <curve ";
foreach my $attr (keys(%curve_defaults)) {
$result .= ' '.$attr.'="'.
$curve_defaults{$attr}->{'default'}."\"\n";
}
$result .= " >\n";
$result .= &insert_data().&insert_data()."</curve>\n";
}
sub insert_function {
my $result;
$result .= "<function></function>\n";
return $result;
}
sub insert_data {
my $result;
$result .= " <data></data>\n";
return $result;
}
##----------------------------------------------------------------------
1;
__END__
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