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Annotation of loncom/cgi/graph.png, revision 1.9

1.1       minaeibi    1: #!/usr/bin/perl
                      2: #
1.8       minaeibi    3: # $Id: graph.gif,v 1.7 2002/01/22 15:12:05 minaeibi Exp $
1.5       minaeibi    4: #
                      5: # Copyright Michigan State University Board of Trustees
                      6: #
                      7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      8: #
                      9: # LON-CAPA is free software; you can redistribute it and/or modify
                     10: # it under the terms of the GNU General Public License as published by
                     11: # the Free Software Foundation; either version 2 of the License, or
                     12: # (at your option) any later version.
                     13: #
                     14: # LON-CAPA is distributed in the hope that it will be useful,
                     15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     17: # GNU General Public License for more details.
                     18: #
                     19: # You should have received a copy of the GNU General Public License
                     20: # along with LON-CAPA; if not, write to the Free Software
                     21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     22: #
                     23: # /home/httpd/cgi-bin/graph.gif
                     24: #
                     25: # http://www.lon-capa.org/
                     26: #
1.1       minaeibi   27: # The LearningOnline Network with CAPA
                     28: # Behrouz Minaei
1.5       minaeibi   29: # YEAR=2001
1.9     ! minaeibi   30: # 9/13/01, 9/25/01, 10/6/01, 10/9/01, 12/25/01
        !            31: # YEAR=2002
        !            32: # 2/1/02
1.1       minaeibi   33: # A CGI script that dynamically outputs a graphical chart for lonstatistics.
1.5       minaeibi   34: # 
                     35: #### 
1.1       minaeibi   36: 
                     37: use strict;
1.9     ! minaeibi   38: use GD::Graph::bars;
1.1       minaeibi   39: use GD::Graph::colour;
                     40: use GD::Graph::Data;
                     41: 
1.4       matthew    42: $|=1;   # Autoflush after each print/write
1.1       minaeibi   43: my ($cid, $Tag, $Max, $PNo, $data) = split(/&/,$ENV{'QUERY_STRING'});
                     44: 
                     45: my @data1=split(/\,/,$data);
                     46:    
                     47: my @xlabels;
                     48: for (my $nIdx=0; $nIdx<$PNo; $nIdx++ ) {
                     49:     $xlabels[$nIdx]=$nIdx+1;
                     50: } 
                     51: my @data =(\@xlabels,\@data1);
                     52: 
                     53: my $Range;
                     54: if ( $PNo > 10 ) {$Range = 30*$PNo;}
1.9     ! minaeibi   55: else { $Range = 400+30*$PNo; }
1.1       minaeibi   56: 
1.9     ! minaeibi   57: $Max += (10 - $Max % 10);
        !            58: $Max = int($Max);
1.1       minaeibi   59: 
1.9     ! minaeibi   60: my $MyGraph = GD::Graph::bars->new($Range, 400);
1.1       minaeibi   61: 
                     62: $MyGraph->set( 
                     63:     x_label         => 'Problems #',
                     64:     y_label         => $Tag,
                     65:     title           => 'LON-CAPA Graphical Chart, Course: '.$cid,
                     66:     y_max_value     => $Max,
                     67:     y_tick_number   => 10,
                     68:     y_label_skip    => 1,
                     69:     x_label_skip    => 2,
                     70:     
                     71:     # colors
1.3       minaeibi   72:     dclrs           => [ qw( green lblue lyellow lpurple cyan lorange)],
1.1       minaeibi   73:     
                     74:     # shadows
                     75:     bar_spacing     => 4,
                     76:     shadow_depth    => 1,
                     77:     shadowclr       => 'dred',
                     78: 
                     79:     transparent     => 0,
                     80: ) or warn $MyGraph->error; 
                     81: 
                     82: # Tell the server we are sending a gif graphic
                     83: print <<END;
                     84: Content-type: image/gif
                     85: 
                     86: END
                     87: 
                     88: my $BinaryData=$MyGraph->plot(\@data)->png;
                     89: undef $MyGraph;
                     90: binmode(STDOUT);
1.2       minaeibi   91: open IMG,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into a gif image
1.1       minaeibi   92: print IMG $BinaryData; # output image
                     93: $|=1; # be sure to flush before closing
                     94: close IMG;
1.3       minaeibi   95: