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Diff for /loncom/cgi/graph.png between versions 1.2 and 1.28

version 1.2, 2001/10/10 16:03:26 version 1.28, 2003/10/21 15:19:25
Line 1 Line 1
 #!/usr/bin/perl  #!/usr/bin/perl
 #  #
 # The LearningOnline Network with CAPA  # $Id$
   #
   # 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.
 #  #
 # Behrouz Minaei  # LON-CAPA is distributed in the hope that it will be useful,
 # 9/13/2001, 9/25/2001  # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # 10/6/2001, 10,9,2001  # 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/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.  # 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 strict;
   use lib '/home/httpd/lib/perl';
 use GD::Graph::bars;  use GD::Graph::bars;
 use GD::Graph::colour;  use GD::Graph::colour;
 use GD::Graph::Data;  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 <<END;
   Content-type: text/html
   
   <html>
   <head><title>Bad Cookie</title></head>
   <body>
   Your cookie information is incorrect.
   </body>
   </html>
   END
       exit;
   }
   
 my ($cid, $Tag, $Max, $PNo, $data) = split(/&/,$ENV{'QUERY_STRING'});  $|=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'});
   
 my @data1=split(/\,/,$data);  #
      # Labels are always digits
 my @xlabels;  my @xlabels;
 for (my $nIdx=0; $nIdx<$PNo; $nIdx++ ) {  for (my $nIdx=0; $nIdx<$NumBars; $nIdx++ ) {
     $xlabels[$nIdx]=$nIdx+1;      $xlabels[$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 $Range;  my $skip_x = 1;
 if ( $PNo > 10 ) {$Range = 30*$PNo;}  my $bar_width=10;
 else { $Range = 300+30*$PNo; }  
   #
 if ( $Max < 1 ) { $Max = 1; }  # Customize graph based on the 
 elsif ( $Max < 10 ) { $Max = 10; }  my $width;
 elsif ( $Max < 100 ) { $Max = 100; }  my $height = 200;
   
 my $MyGraph = GD::Graph::bars->new($Range, 400);  if ($NumBars < 10) {
       $width = 120+$NumBars*15;
 $MyGraph->set(       $skip_x = 1;
     x_label         => 'Problems #',      $bar_width = 15;
     y_label         => $Tag,  } elsif ($NumBars <= 25) {
     title           => 'LON-CAPA Graphical Chart, Course: '.$cid,      $width = 120+$NumBars*11;
     y_max_value     => $Max,      $skip_x = 5;
     y_tick_number   => 10,      $bar_width = 8;
     y_label_skip    => 1,  } elsif ($NumBars <= 50) {
     x_label_skip    => 2,      $width = 120+$NumBars*8;
           $skip_x = 5;
     # colors      $bar_width = 4;
     dclrs           => [ qw(green lblue lyellow lpurple cyan lorange)],  } else {
           $width = 120+$NumBars*8;
     # shadows      $skip_x = 5;
     bar_spacing     => 4,      $bar_width = 4;
     shadow_depth    => 1,  }
     shadowclr       => 'dred',  
   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
   
   <html>
   <head><title>Bad Graph</title></head>
   <body>
   <p>
   There was an error producing the graph you requested.
   </p><p>
   $error
   </p>
   </body>
   </html>
   END
       return;
   }
   
   my $plot = $MyGraph->plot(\@data);
   if (! defined($plot)) {
       print <<"END";
   Content-type: text/html
   
   <html>
   <head><title>Bad Graph</title></head>
   <body>
   The system was unable to create the graph you requested.
   </body>
   </html>
   END
       return;
   }
   
   my $BinaryData=$plot->png;
   undef($MyGraph);
   undef($plot);
   
   if (! defined($BinaryData)) {
       print <<"END";
   Content-type: text/html
   
   <html>
   <head><title>Bad Graph</title></head>
   <body>
   The system was unable to produce a png image of the graph you requested.
   </body>
   </html>
   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 <<END;  print <<END;
 Content-type: image/gif  Content-type: image/png
   
 END  END
   
 my $BinaryData=$MyGraph->plot(\@data)->png;  
 undef $MyGraph;  
 binmode(STDOUT);  binmode(STDOUT);
 open IMG,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into a gif image  #open IMG,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into a gif image
 print IMG $BinaryData; # output image  #print IMG $BinaryData; # output image
 $|=1; # be sure to flush before closing  #$|=1; # be sure to flush before closing
 close IMG;  #close IMG;
   print $BinaryData;
Removed from v.1.2  
changed lines
  Added in v.1.28

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