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Diff for /loncom/cgi/graph.png between versions 1.20 and 1.29

version 1.20, 2003/01/13 17:41:45 version 1.29, 2003/10/27 21:21:08
Line 25 Line 25
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # Behrouz Minaei  #
 # YEAR=2001  
 # 9/13/01, 9/25/01, 10/6/01, 10/9/01, 12/25/01  
 # YEAR=2002  
 # 2/1/, 5/13, 5/15  
 # YEAR=2003  
 # 1/7/, 1/13  
 # 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::lines;
 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;
   }
   
   sub error {
       my ($error) = @_;
       my $Str = <<"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 $Str;
   }
   
   my $id = $ENV{'QUERY_STRING'};
   
   #
   # &get_env($name,$default)
   sub get_env {
       my $key = 'cgi.'.$id.'.'.(shift());
       return shift if (! exists($ENV{$key}));
       return $ENV{$key};
   }
   
   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;
   }
   
 $|=1;   # Autoflush after each print/write  $|=1;   # Autoflush after each print/write
 my ($Titr,$xlab,$ylab,$Max,$PNo,$data1,$data2)=split(/&/,$ENV{'QUERY_STRING'});  
   
 my @data11=split(/\,/,$data1);  my $colordefaults = join(',',
 my @data12=split(/\,/,$data2);                           ('#33ff00', 
 my $skip_x = 1;                            '#0033cc','#990000','#aaaa66','#663399','#ff9933',
 my $bar_space=10;                            '#66ccff','#ff9999','#cccc33','#660000','#33cc66',
                             ));
 my @xlabels;  
   my $height   = &get_env('height',300);
 if ($Titr =~ /^Percentage$/){  my $width    = &get_env('width', 400);
     for (my $nIdx=0; $nIdx<$PNo; $nIdx++ ) {  my $PlotType = &get_env('PlotType','bar');
         $xlabels[$nIdx]=$nIdx;  
     }  my %GraphSettings = (
     @data11=();                       title           => &unescape(&get_env('title','')),
     @data11=split(/\,/,$data2);                       x_label         => &unescape(&get_env('xlabel','')),
     @data12=();                       y_label         => &unescape(&get_env('ylabel','')),
     $Titr = '';                       x_label_position => 0.5,
                        dclrs           => [split(',',&get_env('Colors',
                                                               $colordefaults))],
                        fgclr           => 'black',
                        boxclr          => 'white',
                        accentclr       => 'dblue',
                        valuesclr       => '#ffff77',
                        l_margin        => 10,
                        b_margin        => 10,
                        r_margin        => 10,
                        t_margin        => 10,
                        transparent     => 0,
                        );
   
   $GraphSettings{'x_label_skip'}  = &get_env('xskip',1);
   $GraphSettings{'x_tick_offset'} = &get_env('x_tick_offset',0);
   $GraphSettings{'y_max_value'}   = &get_env('Max',undef);
   
   my $MyGraph;
   if ($PlotType eq 'bar') {
       # Pick up bar graph settings
       $GraphSettings{'bar_width'}     = &get_env('bar_width',undef);
       $GraphSettings{'long_ticks'}    = 1;
       $GraphSettings{'tick_length'}   = 0;
       $GraphSettings{'x_ticks'}       = 0;
       $GraphSettings{'cumulate'}      = 2;
       $GraphSettings{'zero_axis'}     = 1;
 } else {  } else {
      for (my $nIdx=0; $nIdx<$PNo; $nIdx++ ) {      #
          $xlabels[$nIdx]=$nIdx+1;      # X label skip setup
      }      my $skip_x = &get_env('xskip',1);
 }       my $x_tick_offset = &get_env('x_tick_offset',$skip_x-1);
       my $zero_axis = &get_env('zero_axis',1);
 my @data =(\@xlabels,\@data11,\@data12);      #
       # Fill up %GraphSettings
 my $Range1;      $GraphSettings{'long_ticks'}    = 1;
 my $Range2 = 200;      $GraphSettings{'tick_length'}   = 0;
       $GraphSettings{'x_ticks'}       = &get_env('x_ticks',0),;
 if ($xlab=~/^Concepts$/){      $GraphSettings{'x_label_skip'}  = $skip_x;
     $Range1=270;      $GraphSettings{'x_tick_offset'} = $x_tick_offset;
 } elsif ($xlab=~/^Problem_number$/){      $GraphSettings{'zero_axis'}     = 1;
     $Range1=450;  }
   #
   # Pick up miscellanious values passed in by the user
   #
   # Create the plot and check it out
   if ($PlotType eq 'bar') {
       $MyGraph = GD::Graph::bars->new($width,$height);
 } else {  } else {
     $Range1=($PNo==100) ? 800 : (120+$PNo*10);       $MyGraph = GD::Graph::lines->new($width,$height);
     $skip_x=5;  }
     $bar_space=1;  if (! defined($MyGraph)) {
       print &error('Unable to create initial graph');
       return;
 }  }
   
   ##
   ## Build the @Data array
   my $NumSets = &get_env('NumSets');
   my @Data;  # stores the data for the graph
   my @xlabels  = split(',',&get_env('labels'));
   push(@Data,\@xlabels);
   for (my $i=1;$i<=$NumSets;$i++) {
       push(@Data,[split(',',&get_env('data.'.$i))]);
   }
   
 my $MyGraph = GD::Graph::bars->new($Range1,$Range2);  my $error = '';
   if (! $MyGraph->set(%GraphSettings)) {
 $MyGraph->set(       print &error($MyGraph->error);
     x_label         => $xlab,      return;
     y_label         => $ylab,  }
     long_ticks      => 1,  
     tick_length     => 0,  
     x_ticks         => 0,  
     title           => $Titr,  
     y_max_value     => $Max,  
 #    y_tick_number   => $ytic,  
     y_label_skip    => 5,  
     x_label_skip    => $skip_x,     
   
     dclrs           => [ qw( lgreen dgreen lyellow lpurple cyan lorange)],  
       
     bar_spacing     => $bar_space,  
     cumulate        => 2,  
     zero_axis        => 1,  
   
 #    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,  my $plot = $MyGraph->plot(\@Data);
 ) or warn $MyGraph->error;   if (! defined($plot)) {
       my $error = 'Unable to plot the data provided.';
       $error .= '<pre>'.join(',',@{$Data[0]}).'</pre>';
       $error .= '<pre>'.join(',',@{$Data[1]}).'</pre>';
       $error .= '<pre>'.join(',',@{$Data[2]}).'</pre>';
       print &error($error);
       exit;
   }
   
   my $BinaryData=$plot->png;
   undef($MyGraph);
   undef($plot);
   
   if (! defined($BinaryData)) {
       print &error('Unable to render graph as image');
       exit;
   }
   
 # Tell the server we are sending a png graphic  # Tell the server we are sending a png graphic
 print <<END;  print <<END;
Line 122  Content-type: image/png Line 224  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
Removed from v.1.20  
changed lines
  Added in v.1.29

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