Annotation of loncom/cgi/graph.png, revision 1.24
1.1 minaeibi 1: #!/usr/bin/perl
2: #
1.24 ! matthew 3: # $Id: graph.png,v 1.23 2003/10/09 15:56:41 matthew 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
1.22 matthew 28: #
1.1 minaeibi 29: # A CGI script that dynamically outputs a graphical chart for lonstatistics.
1.5 minaeibi 30: #
31: ####
1.22 matthew 32:
33: =pod
34:
35: =head1 NAME
36:
37: graph.png
38:
39: =head1 SYNOPSIS
40:
41: produces plots based on input
42:
43: =head1 DESCRIPTION
44:
45: graph.png is a cgi-bin script which produces plots based on input data.
46:
47: The query string is expected to be as follows (without whitespace):
48:
49: escape(Plot title) & escape(X label)& escape(Y label) & Maximum Y value &
50: Number of bars & $data1 & $data2
51:
52: $data1 and $data2 are expected to be comma seperated lists of numbers.
53: escape( value ) means the values must be run through lonnet::escape.
54:
55: =cut
1.1 minaeibi 56:
57: use strict;
1.24 ! matthew 58: use lib '/home/httpd/lib/perl';
1.9 minaeibi 59: use GD::Graph::bars;
1.1 minaeibi 60: use GD::Graph::colour;
61: use GD::Graph::Data;
1.24 ! matthew 62: use LONCAPA::loncgi();
1.1 minaeibi 63:
1.21 matthew 64: sub unescape {
65: my $str=shift;
66: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
67: return $str;
68: }
69:
1.24 ! matthew 70: if (! &LONCAPA::loncgi::check_cookie_and_load_env()) {
! 71: print <<END;
! 72: Content-type: text/html
! 73:
! 74: <html>
! 75: <head><title>Bad Cookie</title></head>
! 76: <body>
! 77: Your cookie information is incorrect. What\'s up with that?
! 78: </body>
! 79: </html>
! 80: END
! 81: return;
! 82: }
! 83:
1.4 matthew 84: $|=1; # Autoflush after each print/write
1.24 ! matthew 85: my $identifier = $ENV{'QUERY_STRING'};
! 86: my $Title = &unescape($ENV{$identifier.'.title'});
! 87: my $xlabel = &unescape($ENV{$identifier.'.xlabel'});
! 88: my $ylabel = &unescape($ENV{$identifier.'.ylabel'});
! 89: my $Max = $ENV{$identifier.'.Max'};
! 90: my $NumBars = $ENV{$identifier.'.NumBars'};
! 91: my $data1 = $ENV{$identifier.'.data1'};
! 92: my $data2 = $ENV{$identifier.'.data2'};
1.11 minaeibi 93:
94: my @data11=split(/\,/,$data1);
95: my @data12=split(/\,/,$data2);
1.18 minaeibi 96: my $skip_x = 1;
1.23 matthew 97: my $bar_width=10;
1.1 minaeibi 98:
1.24 ! matthew 99: #
! 100: # Labels are always digits
1.1 minaeibi 101: my @xlabels;
1.23 matthew 102: for (my $nIdx=0; $nIdx<$NumBars; $nIdx++ ) {
103: $xlabels[$nIdx]=$nIdx+1;
104: }
105:
1.11 minaeibi 106: my @data =(\@xlabels,\@data11,\@data12);
1.1 minaeibi 107:
1.24 ! matthew 108: #
! 109: # Customize graph based on the
1.21 matthew 110: my $width;
111: my $height = 200;
1.12 minaeibi 112:
1.23 matthew 113: if ($NumBars < 10) {
114: $width = 120+$NumBars*15;
115: $skip_x = 1;
116: $bar_width = 15;
117: } elsif ($NumBars <= 25) {
118: $width = 120+$NumBars*11;
119: $skip_x = 5;
120: $bar_width = 8;
121: } elsif ($NumBars <= 50) {
122: $width = 120+$NumBars*8;
123: $skip_x = 5;
124: $bar_width = 4;
1.19 minaeibi 125: } else {
1.23 matthew 126: $width = 120+$NumBars*8;
127: $skip_x = 5;
128: $bar_width = 4;
1.11 minaeibi 129: }
1.1 minaeibi 130:
1.21 matthew 131: my $x_tick_offset = 0;
132: if ($skip_x > 1) {
133: $x_tick_offset = $skip_x - 1;
134: }
1.1 minaeibi 135:
1.21 matthew 136: my $MyGraph = GD::Graph::bars->new($width,$height);
1.24 ! matthew 137: my $error = '';
! 138: if (! $MyGraph->set( x_label => $xlabel,
! 139: y_label => $ylabel,
! 140: x_label_position => 0.5,
! 141: long_ticks => 1,
! 142: tick_length => 0,
! 143: x_ticks => 0,
! 144: title => $Title,
! 145: y_max_value => $Max,
! 146: x_label_skip => $skip_x,
! 147: x_tick_offset => $x_tick_offset,
! 148: #
! 149: dclrs => [ qw(lgreen dgreen lyellow
! 150: lpurple cyan lorange)],
! 151: bar_width => $bar_width,
! 152: cumulate => 2,
! 153: zero_axis => 1,
! 154: fgclr => 'black',
! 155: boxclr => 'white',
! 156: accentclr => 'dblue',
! 157: valuesclr => '#ffff77',
! 158: l_margin => 10,
! 159: b_margin => 10,
! 160: r_margin => 10,
! 161: t_margin => 10,
! 162: #
! 163: transparent => 0,
! 164: )) {
! 165: $error = $MyGraph->error;
! 166: print <<"END";
! 167: Content-type: text/html
! 168:
! 169: <html>
! 170: <head><title>Bad Graph</title></head>
! 171: <body>
! 172: <p>
! 173: There was an error producing the graph you requested.
! 174: </p><p>
! 175: $error
! 176: </p>
! 177: </body>
! 178: </html>
! 179: END
! 180: return;
! 181: }
1.1 minaeibi 182:
1.24 ! matthew 183: my $plot = $MyGraph->plot(\@data);
! 184: if (! defined($plot)) {
! 185: print <<"END";
! 186: Content-type: text/html
! 187:
! 188: <html>
! 189: <head><title>Bad Graph</title></head>
! 190: <body>
! 191: The system was unable to create the graph you requested.
! 192: </body>
! 193: </html>
! 194: END
! 195: return;
! 196: }
1.1 minaeibi 197:
1.24 ! matthew 198: my $BinaryData=$plot->png;
! 199: undef($MyGraph);
! 200: undef($plot);
! 201:
! 202: if (! defined($BinaryData)) {
! 203: print <<"END";
! 204: Content-type: text/html
! 205:
! 206: <html>
! 207: <head><title>Bad Graph</title></head>
! 208: <body>
! 209: The system was unable to produce a png image of the graph you requested.
! 210: </body>
! 211: </html>
! 212: END
! 213: return;
! 214: }
1.14 minaeibi 215:
1.12 minaeibi 216:
1.16 albertel 217: # Tell the server we are sending a png graphic
1.1 minaeibi 218: print <<END;
1.16 albertel 219: Content-type: image/png
1.1 minaeibi 220:
221: END
222:
223: binmode(STDOUT);
1.16 albertel 224: #open IMG,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into a gif image
225: #print IMG $BinaryData; # output image
226: #$|=1; # be sure to flush before closing
227: #close IMG;
228: print $BinaryData;
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