--- loncom/cgi/graph.png 2001/10/10 15:26:00 1.1 +++ loncom/cgi/graph.png 2003/10/21 15:19:25 1.28 @@ -1,92 +1,228 @@ #!/usr/bin/perl # -# The LearningOnline Network with CAPA +# $Id: graph.png,v 1.28 2003/10/21 15:19:25 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. # -# Behrouz Minaei -# 9/13/2001, 9/25/2001 -# 10/6/2001, 10,9,2001 +# 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/cgi-bin/graph.gif +# +# http://www.lon-capa.org/ +# +# The LearningOnline Network with CAPA # # A CGI script that dynamically outputs a graphical chart for lonstatistics. +# +#### -use strict; -use GD::Graph::bars; -use GD::Graph::colour; -use GD::Graph::Data; +=pod -my ($cid, $Tag, $Max, $PNo, $data) = split(/&/,$ENV{'QUERY_STRING'}); +=head1 NAME -my @data1=split(/\,/,$data); - -my @xlabels; -for (my $nIdx=0; $nIdx<$PNo; $nIdx++ ) { - $xlabels[$nIdx]=$nIdx+1; -} -my @data =(\@xlabels,\@data1); +graph.png -#print "Content-type: text/html\n\n"; -#print $ENV{'QUERY_STRING'; -#print "
"; -#print $Max; -#print "
"; -#print $PNo; -#print "
"; -#print $data; -#exit; - -my $Range; -if ( $PNo > 10 ) {$Range = 30*$PNo;} -else { $Range = 300+30*$PNo; } - -if ( $Max < 1 ) { $Max = 1; } -elsif ( $Max < 10 ) { $Max = 10; } -elsif ( $Max < 100 ) { $Max = 100; } - -my $MyGraph = GD::Graph::bars->new($Range, 400); - -$MyGraph->set( - x_label => 'Problems #', - y_label => $Tag, - title => 'LON-CAPA Graphical Chart, Course: '.$cid, - y_max_value => $Max, - y_tick_number => 10, - y_label_skip => 1, - x_label_skip => 2, - - # colors - dclrs => [ qw(green lblue lyellow lpurple cyan lorange)], - - # shadows - bar_spacing => 4, - shadow_depth => 1, - shadowclr => 'dred', +=head1 SYNOPSIS - transparent => 0, -) or warn $MyGraph->error; +produces plots based on input -# Tell the server we are sending a gif graphic -print <plot(\@data)->png; -undef $MyGraph; -binmode(STDOUT); -open IMG,"|pngtopnm|ppmtogif"; # convert into a gif image -print IMG $BinaryData; # output image -$|=1; # be sure to flush before closing -close IMG; +The query string is expected to be as follows (without whitespace): +escape(Plot title) & escape(X label)& escape(Y label) & Maximum Y value & +Number of bars & $data1 & $data2 +$data1 and $data2 are expected to be comma seperated lists of numbers. +escape( value ) means the values must be run through lonnet::escape. +=cut +use strict; +use lib '/home/httpd/lib/perl'; +use GD::Graph::bars; +use GD::Graph::colour; +use GD::Graph::Data; +use LONCAPA::loncgi(); +sub unescape { + my $str=shift; + $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; + return $str; +} + +if (! &LONCAPA::loncgi::check_cookie_and_load_env()) { + print < +Bad Cookie + +Your cookie information is incorrect. + + +END + exit; +} +$|=1; # Autoflush after each print/write +my $identifier = $ENV{'QUERY_STRING'}; +my $Title = &unescape($ENV{'cgi.'.$identifier.'.title'}); +my $xlabel = &unescape($ENV{'cgi.'.$identifier.'.xlabel'}); +my $ylabel = &unescape($ENV{'cgi.'.$identifier.'.ylabel'}); +my $Max = $ENV{'cgi.'.$identifier.'.Max'}; +my $NumBars = $ENV{'cgi.'.$identifier.'.NumBars'}; +my $NumSets = $ENV{'cgi.'.$identifier.'.NumSets'}; +my @Colors = split(',',$ENV{'cgi.'.$identifier.'.Colors'}); +# +# Labels are always digits +my @xlabels; +for (my $nIdx=0; $nIdx<$NumBars; $nIdx++ ) { + $xlabels[$nIdx]=$nIdx+1; +} +my @data; # stores the data for the graph +push(@data,\@xlabels); +for (my $i=1;$i<=$NumSets;$i++) { + push(@data,[split(',',$ENV{'cgi.'.$identifier.'.data.'.$i})]); +} +my $skip_x = 1; +my $bar_width=10; +# +# Customize graph based on the +my $width; +my $height = 200; + +if ($NumBars < 10) { + $width = 120+$NumBars*15; + $skip_x = 1; + $bar_width = 15; +} elsif ($NumBars <= 25) { + $width = 120+$NumBars*11; + $skip_x = 5; + $bar_width = 8; +} elsif ($NumBars <= 50) { + $width = 120+$NumBars*8; + $skip_x = 5; + $bar_width = 4; +} else { + $width = 120+$NumBars*8; + $skip_x = 5; + $bar_width = 4; +} + +my $x_tick_offset = 0; +if ($skip_x > 1) { + $x_tick_offset = $skip_x - 1; +} + +my $MyGraph = GD::Graph::bars->new($width,$height); +my $error = ''; +if (! $MyGraph->set( x_label => $xlabel, + y_label => $ylabel, + x_label_position => 0.5, + long_ticks => 1, + tick_length => 0, + x_ticks => 0, + title => $Title, + y_max_value => $Max, + x_label_skip => $skip_x, + x_tick_offset => $x_tick_offset, + # + dclrs => \@Colors, + bar_width => $bar_width, + cumulate => 2, + zero_axis => 1, + fgclr => 'black', + boxclr => 'white', + accentclr => 'dblue', + valuesclr => '#ffff77', + l_margin => 10, + b_margin => 10, + r_margin => 10, + t_margin => 10, + # + transparent => 0, + )) { + $error = $MyGraph->error; + print <<"END"; +Content-type: text/html + + +Bad Graph + +

+There was an error producing the graph you requested. +

+$error +

+ + +END + return; +} + +my $plot = $MyGraph->plot(\@data); +if (! defined($plot)) { + print <<"END"; +Content-type: text/html + + +Bad Graph + +The system was unable to create the graph you requested. + + +END + return; +} +my $BinaryData=$plot->png; +undef($MyGraph); +undef($plot); + +if (! defined($BinaryData)) { + print <<"END"; +Content-type: text/html + + +Bad Graph + +The system was unable to produce a png image of the graph you requested. + + +END + return; +} +# Tell the server we are sending a png graphic +print </dev/null"; # convert into a gif image +#print IMG $BinaryData; # output image +#$|=1; # be sure to flush before closing +#close IMG; +print $BinaryData;