--- loncom/cgi/graph.png 2002/01/22 15:12:05 1.7 +++ loncom/cgi/graph.png 2003/10/21 15:19:25 1.28 @@ -1,6 +1,6 @@ #!/usr/bin/perl # -# $Id: graph.png,v 1.7 2002/01/22 15:12:05 minaeibi Exp $ +# $Id: graph.png,v 1.28 2003/10/21 15:19:25 matthew Exp $ # # Copyright Michigan State University Board of Trustees # @@ -25,69 +25,204 @@ # http://www.lon-capa.org/ # # The LearningOnline Network with CAPA -# Behrouz Minaei -# YEAR=2001 -# 9/13/2001, 9/25/2001, 10/6/2001, 10/9/2001, 12/25/2001 # # A CGI script that dynamically outputs a graphical chart for lonstatistics. # #### +=pod + +=head1 NAME + +graph.png + +=head1 SYNOPSIS + +produces plots based on input + +=head1 DESCRIPTION + +graph.png is a cgi-bin script which produces plots based on input data. + +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 GD::Graph::bars3d; +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; +} $|=1; # Autoflush after each print/write -my ($cid, $Tag, $Max, $PNo, $data) = split(/&/,$ENV{'QUERY_STRING'}); +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'}); -my @data1=split(/\,/,$data); - +# +# Labels are always digits my @xlabels; -for (my $nIdx=0; $nIdx<$PNo; $nIdx++ ) { +for (my $nIdx=0; $nIdx<$NumBars; $nIdx++ ) { $xlabels[$nIdx]=$nIdx+1; -} -my @data =(\@xlabels,\@data1); +} +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 $Range; -if ( $PNo > 10 ) {$Range = 30*$PNo;} -else { $Range = 300+30*$PNo; } - -$Max += (10 - $Max % 10); - -my $MyGraph = GD::Graph::bars3d->new($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', +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; +} - transparent => 0, -) or warn $MyGraph->error; -# Tell the server we are sending a gif graphic +# Tell the server we are sending a png graphic print <plot(\@data)->png; -undef $MyGraph; binmode(STDOUT); -open IMG,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into a gif image -print IMG $BinaryData; # output image -$|=1; # be sure to flush before closing -close IMG; - +#open IMG,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into a gif image +#print IMG $BinaryData; # output image +#$|=1; # be sure to flush before closing +#close IMG; +print $BinaryData;