Annotation of loncom/cgi/graph.png, revision 1.31
1.1 minaeibi 1: #!/usr/bin/perl
2: #
1.31 ! matthew 3: # $Id: graph.png,v 1.30 2003/10/29 14:47:43 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:
1.31 ! matthew 41: produces plots from data stored in users environment.
1.22 matthew 42:
43: =head1 DESCRIPTION
44:
1.31 ! matthew 45: graph.png is a cgi-bin script which produces plots based on data stored
! 46: in the users environment. The users cookie is checked prior to producing
! 47: a plot. The query string is expected to be an identifier, $id.
! 48: The parameters defining the plot must be stored in the environment as
! 49: $ENV{'cgi.'.$id.'.'.$dataname}. Two types of plots can be produced, 'bar'
! 50: and 'xy'. The 'xy' graph can will 1 or 2 y-axes if the parameter
! 51: 'two_axes' is set to false or true respectively. See perldoc GD::Graph and
! 52: loncommon::DrawBarGraph, loncommon::DrawXYGraph, and loncommon::DrawXYYGraph.
1.22 matthew 53:
54: =cut
1.1 minaeibi 55:
56: use strict;
1.24 matthew 57: use lib '/home/httpd/lib/perl';
1.9 minaeibi 58: use GD::Graph::bars;
1.29 matthew 59: use GD::Graph::lines;
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 $str;
68: }
69:
1.29 matthew 70: sub error {
71: my ($error) = @_;
72: my $Str = <<"END";
73: Content-type: text/html
74:
75: <html>
76: <head><title>Bad Graph</title></head>
77: <body>
78: <p>
79: There was an error producing the graph you requested.
80: </p><p>
81: $error
82: </p>
83: </body>
84: </html>
85: END
86: return $Str;
87: }
88:
89: my $id = $ENV{'QUERY_STRING'};
90:
91: #
1.31 ! matthew 92: # usage: &get_env($name,$default)
1.29 matthew 93: sub get_env {
94: my $key = 'cgi.'.$id.'.'.(shift());
95: return shift if (! exists($ENV{$key}));
96: return $ENV{$key};
97: }
98:
1.24 matthew 99: if (! &LONCAPA::loncgi::check_cookie_and_load_env()) {
100: print <<END;
101: Content-type: text/html
102:
103: <html>
104: <head><title>Bad Cookie</title></head>
105: <body>
1.28 matthew 106: Your cookie information is incorrect.
1.24 matthew 107: </body>
108: </html>
109: END
1.26 albertel 110: exit;
1.24 matthew 111: }
112:
1.4 matthew 113: $|=1; # Autoflush after each print/write
1.1 minaeibi 114:
1.31 ! matthew 115: ##
! 116: ## Set up the plot
! 117: ##
1.29 matthew 118: my $colordefaults = join(',',
119: ('#33ff00',
120: '#0033cc','#990000','#aaaa66','#663399','#ff9933',
121: '#66ccff','#ff9999','#cccc33','#660000','#33cc66',
122: ));
123:
124: my $height = &get_env('height',300);
125: my $width = &get_env('width', 400);
126: my $PlotType = &get_env('PlotType','bar');
127:
128: my %GraphSettings = (
129: title => &unescape(&get_env('title','')),
130: x_label => &unescape(&get_env('xlabel','')),
131: y_label => &unescape(&get_env('ylabel','')),
1.24 matthew 132: x_label_position => 0.5,
1.29 matthew 133: dclrs => [split(',',&get_env('Colors',
134: $colordefaults))],
1.24 matthew 135: fgclr => 'black',
136: boxclr => 'white',
137: accentclr => 'dblue',
138: valuesclr => '#ffff77',
139: l_margin => 10,
140: b_margin => 10,
141: r_margin => 10,
142: t_margin => 10,
143: transparent => 0,
1.29 matthew 144: );
1.24 matthew 145:
1.29 matthew 146: $GraphSettings{'x_label_skip'} = &get_env('xskip',1);
147: $GraphSettings{'x_tick_offset'} = &get_env('x_tick_offset',0);
1.31 ! matthew 148: $GraphSettings{'y_max_value'} = &get_env('y_max_value',1);
1.29 matthew 149:
150: my $MyGraph;
151: if ($PlotType eq 'bar') {
152: # Pick up bar graph settings
153: $GraphSettings{'bar_width'} = &get_env('bar_width',undef);
154: $GraphSettings{'long_ticks'} = 1;
155: $GraphSettings{'tick_length'} = 0;
156: $GraphSettings{'x_ticks'} = 0;
157: $GraphSettings{'cumulate'} = 2;
158: $GraphSettings{'zero_axis'} = 1;
159: } else {
160: #
161: # X label skip setup
162: my $skip_x = &get_env('xskip',1);
163: my $x_tick_offset = &get_env('x_tick_offset',$skip_x-1);
164: my $zero_axis = &get_env('zero_axis',1);
165: #
166: # Fill up %GraphSettings
167: $GraphSettings{'long_ticks'} = 1;
168: $GraphSettings{'tick_length'} = 0;
169: $GraphSettings{'x_ticks'} = &get_env('x_ticks',0),;
170: $GraphSettings{'x_label_skip'} = $skip_x;
171: $GraphSettings{'x_tick_offset'} = $x_tick_offset;
172: $GraphSettings{'zero_axis'} = 1;
1.30 matthew 173: if (&get_env('two_axes',0)) {
174: $GraphSettings{'two_axes'} = 1;
175: $GraphSettings{'y1_max_value'} = &get_env('y1_max_value',0);
176: $GraphSettings{'y1_min_value'} = &get_env('y1_min_value',1);
177: $GraphSettings{'y2_max_value'} = &get_env('y2_max_value',1);
178: $GraphSettings{'y2_min_value'} = &get_env('y2_min_value',1);
179: }
1.29 matthew 180: }
181: #
182: # Pick up miscellanious values passed in by the user
183: #
184: # Create the plot and check it out
185: if ($PlotType eq 'bar') {
186: $MyGraph = GD::Graph::bars->new($width,$height);
187: } else {
188: $MyGraph = GD::Graph::lines->new($width,$height);
189: }
190: if (! defined($MyGraph)) {
191: print &error('Unable to create initial graph');
1.24 matthew 192: return;
193: }
1.1 minaeibi 194:
1.29 matthew 195: ##
196: ## Build the @Data array
197: my $NumSets = &get_env('NumSets');
198: my @Data; # stores the data for the graph
199: my @xlabels = split(',',&get_env('labels'));
200: push(@Data,\@xlabels);
201: for (my $i=1;$i<=$NumSets;$i++) {
202: push(@Data,[split(',',&get_env('data.'.$i))]);
203: }
1.24 matthew 204:
1.29 matthew 205: my $error = '';
206: if (! $MyGraph->set(%GraphSettings)) {
207: print &error($MyGraph->error);
1.24 matthew 208: return;
209: }
1.1 minaeibi 210:
1.29 matthew 211: my $plot = $MyGraph->plot(\@Data);
212: if (! defined($plot)) {
213: my $error = 'Unable to plot the data provided.';
1.30 matthew 214: # Debugging code:
215: # $error .= '<pre>'.join(',',@{$Data[0]}).'</pre>';
216: # $error .= '<pre>'.join(',',@{$Data[1]}).'</pre>';
217: # $error .= '<pre>'.join(',',@{$Data[2]}).'</pre>' if (ref($Data[2]));
218: # $error .= '<pre>'.join(',',@{$Data[3]}).'</pre>' if (ref($Data[3]));
1.29 matthew 219: print &error($error);
220: exit;
221: }
222:
1.24 matthew 223: my $BinaryData=$plot->png;
224: undef($MyGraph);
225: undef($plot);
226:
227: if (! defined($BinaryData)) {
1.29 matthew 228: print &error('Unable to render graph as image');
229: exit;
1.24 matthew 230: }
1.12 minaeibi 231:
1.16 albertel 232: # Tell the server we are sending a png graphic
1.1 minaeibi 233: print <<END;
1.16 albertel 234: Content-type: image/png
1.1 minaeibi 235:
236: END
237:
238: binmode(STDOUT);
1.16 albertel 239: #open IMG,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into a gif image
240: #print IMG $BinaryData; # output image
241: #$|=1; # be sure to flush before closing
242: #close IMG;
243: print $BinaryData;
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