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Diff for /loncom/cgi/graph.png between versions 1.2 and 1.23

version 1.2, 2001/10/10 16:03:26 version 1.23, 2003/10/09 15:56:41
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 #!/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.
   #
   # 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
 #  #
 # Behrouz Minaei  # /home/httpd/cgi-bin/graph.gif
 # 9/13/2001, 9/25/2001  #
 # 10/6/2001, 10,9,2001  # 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 GD::Graph::bars;  use GD::Graph::bars;
 use GD::Graph::colour;  use GD::Graph::colour;
 use GD::Graph::Data;  use GD::Graph::Data;
   
 my ($cid, $Tag, $Max, $PNo, $data) = split(/&/,$ENV{'QUERY_STRING'});  sub unescape {
       my $str=shift;
       $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       return $str;
   }
   
   $|=1;   # Autoflush after each print/write
   my ($Titr,$xlab,$ylab,$Max,$NumBars,$data1,$data2)=split(/&/,$ENV{'QUERY_STRING'});
   $Titr = &unescape($Titr);
   $xlab = &unescape($xlab);
   $ylab = &unescape($ylab);
   
   my @data11=split(/\,/,$data1);
   my @data12=split(/\,/,$data2);
   my $skip_x = 1;
   #my $bar_space=1;
   my $bar_width=10;
   
 my @data1=split(/\,/,$data);  
      
 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 $Range;  #if ($Titr =~ /^Percentage$/){
 if ( $PNo > 10 ) {$Range = 30*$PNo;}  #    for (my $nIdx=0; $nIdx<$NumBars; $nIdx++ ) {
 else { $Range = 300+30*$PNo; }  #        $xlabels[$nIdx]=$nIdx;
   #    }
 if ( $Max < 1 ) { $Max = 1; }  #    @data11=();
 elsif ( $Max < 10 ) { $Max = 10; }  #    @data11=split(/\,/,$data2);
 elsif ( $Max < 100 ) { $Max = 100; }  #    @data12=();
   #    $Titr = '';
   #} else {
   #} 
   
   my @data =(\@xlabels,\@data11,\@data12);
   
   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 $MyGraph = GD::Graph::bars->new($Range, 400);  my $MyGraph = GD::Graph::bars->new($width,$height);
   
 $MyGraph->set(   $MyGraph->set( 
     x_label         => 'Problems #',      x_label         => $xlab,
     y_label         => $Tag,      y_label         => $ylab,
     title           => 'LON-CAPA Graphical Chart, Course: '.$cid,      x_label_position => 0.5,
       long_ticks      => 1,
       tick_length     => 0,
       x_ticks         => 0,
       title           => $Titr,
     y_max_value     => $Max,      y_max_value     => $Max,
     y_tick_number   => 10,  #    y_tick_number   => $ytic,
     y_label_skip    => 1,  #    y_label_skip    => 5,
     x_label_skip    => 2,      x_label_skip    => $skip_x,   
           x_tick_offset   => $x_tick_offset,
     # colors  
     dclrs           => [ qw(green lblue lyellow lpurple cyan lorange)],      dclrs           => [ qw( lgreen dgreen lyellow lpurple cyan lorange)],
           bar_width       => $bar_width,
     # shadows  #    bar_spacing     => $bar_space,
     bar_spacing     => 4,      cumulate        => 2,
     shadow_depth    => 1,      zero_axis        => 1,
     shadowclr       => 'dred',  
   #    legend_placement    => 'RT',
   
       fgclr               => 'black',
       boxclr              => 'white',
       accentclr           => 'dblue',
       valuesclr           => '#ffff77',
       l_margin            => 10,
       b_margin            => 10,
       r_margin            => 10,
       t_margin            => 10,
   
     transparent     => 0,      transparent     => 0,
 ) or warn $MyGraph->error;   ) 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;  my $BinaryData=$MyGraph->plot(\@data)->png;
 undef $MyGraph;  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.1.23

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