version 1.28, 2003/10/21 15:19:25
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version 1.34, 2005/04/07 06:56:21
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Line 38 graph.png
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Line 38 graph.png
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=head1 SYNOPSIS |
=head1 SYNOPSIS |
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produces plots based on input |
produces plots from data stored in users environment. |
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=head1 DESCRIPTION |
=head1 DESCRIPTION |
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graph.png is a cgi-bin script which produces plots based on input data. |
graph.png is a cgi-bin script which produces plots based on data stored |
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in the users environment. The users cookie is checked prior to producing |
The query string is expected to be as follows (without whitespace): |
a plot. The query string is expected to be an identifier, $id. |
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The parameters defining the plot must be stored in the environment as |
escape(Plot title) & escape(X label)& escape(Y label) & Maximum Y value & |
$ENV{'cgi.'.$id.'.'.$dataname}. Two types of plots can be produced, 'bar' |
Number of bars & $data1 & $data2 |
and 'xy'. The 'xy' graph can will 1 or 2 y-axes if the parameter |
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'two_axes' is set to false or true respectively. See perldoc GD::Graph and |
$data1 and $data2 are expected to be comma seperated lists of numbers. |
loncommon::DrawBarGraph, loncommon::DrawXYGraph, and loncommon::DrawXYYGraph. |
escape( value ) means the values must be run through lonnet::escape. |
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=cut |
=cut |
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use strict; |
use strict; |
use lib '/home/httpd/lib/perl'; |
use lib '/home/httpd/lib/perl'; |
use GD::Graph::bars; |
use GD::Graph::bars; |
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use GD::Graph::lines; |
use GD::Graph::colour; |
use GD::Graph::colour; |
use GD::Graph::Data; |
use GD::Graph::Data; |
use LONCAPA::loncgi(); |
use LONCAPA::loncgi; |
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sub unescape { |
sub unescape { |
my $str=shift; |
my $str=shift; |
Line 67 sub unescape {
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Line 67 sub unescape {
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return $str; |
return $str; |
} |
} |
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if (! &LONCAPA::loncgi::check_cookie_and_load_env()) { |
sub error { |
print <<END; |
my ($error) = @_; |
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my $Str = <<"END"; |
Content-type: text/html |
Content-type: text/html |
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<html> |
<html> |
<head><title>Bad Cookie</title></head> |
<head><title>Bad Graph</title></head> |
<body> |
<body> |
Your cookie information is incorrect. |
<p> |
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There was an error producing the graph you requested. |
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</p><p> |
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$error |
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</p> |
</body> |
</body> |
</html> |
</html> |
END |
END |
exit; |
return $Str; |
} |
} |
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$|=1; # Autoflush after each print/write |
my $id = $ENV{'QUERY_STRING'}; |
my $identifier = $ENV{'QUERY_STRING'}; |
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my $Title = &unescape($ENV{'cgi.'.$identifier.'.title'}); |
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my $xlabel = &unescape($ENV{'cgi.'.$identifier.'.xlabel'}); |
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my $ylabel = &unescape($ENV{'cgi.'.$identifier.'.ylabel'}); |
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my $Max = $ENV{'cgi.'.$identifier.'.Max'}; |
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my $NumBars = $ENV{'cgi.'.$identifier.'.NumBars'}; |
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my $NumSets = $ENV{'cgi.'.$identifier.'.NumSets'}; |
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my @Colors = split(',',$ENV{'cgi.'.$identifier.'.Colors'}); |
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# |
# |
# Labels are always digits |
# usage: &get_env($name,$default) |
my @xlabels; |
sub get_env { |
for (my $nIdx=0; $nIdx<$NumBars; $nIdx++ ) { |
my $key = 'cgi.'.$id.'.'.(shift()); |
$xlabels[$nIdx]=$nIdx+1; |
return shift if (! exists($env{$key})); |
} |
return $env{$key}; |
my @data; # stores the data for the graph |
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push(@data,\@xlabels); |
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for (my $i=1;$i<=$NumSets;$i++) { |
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push(@data,[split(',',$ENV{'cgi.'.$identifier.'.data.'.$i})]); |
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} |
} |
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my $skip_x = 1; |
if (! &LONCAPA::loncgi::check_cookie_and_load_env()) { |
my $bar_width=10; |
print <<END; |
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Content-type: text/html |
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# |
<html> |
# Customize graph based on the |
<head><title>Bad Cookie</title></head> |
my $width; |
<body> |
my $height = 200; |
Your cookie information is incorrect. |
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</body> |
if ($NumBars < 10) { |
</html> |
$width = 120+$NumBars*15; |
END |
$skip_x = 1; |
exit; |
$bar_width = 15; |
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} elsif ($NumBars <= 25) { |
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$width = 120+$NumBars*11; |
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$skip_x = 5; |
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$bar_width = 8; |
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} elsif ($NumBars <= 50) { |
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$width = 120+$NumBars*8; |
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$skip_x = 5; |
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$bar_width = 4; |
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} else { |
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$width = 120+$NumBars*8; |
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$skip_x = 5; |
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$bar_width = 4; |
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} |
} |
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my $x_tick_offset = 0; |
$|=1; # Autoflush after each print/write |
if ($skip_x > 1) { |
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$x_tick_offset = $skip_x - 1; |
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} |
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my $MyGraph = GD::Graph::bars->new($width,$height); |
## |
my $error = ''; |
## Set up the plot |
if (! $MyGraph->set( x_label => $xlabel, |
## |
y_label => $ylabel, |
my $colordefaults = join(',', |
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('#33ff00', |
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'#0033cc','#990000','#aaaa66','#663399','#ff9933', |
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'#66ccff','#ff9999','#cccc33','#660000','#33cc66', |
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)); |
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my $height = &get_env('height',300); |
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my $width = &get_env('width', 400); |
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my $PlotType = &get_env('PlotType','bar'); |
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my %GraphSettings = ( |
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title => &unescape(&get_env('title','')), |
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x_label => &unescape(&get_env('xlabel','')), |
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y_label => &unescape(&get_env('ylabel','')), |
x_label_position => 0.5, |
x_label_position => 0.5, |
long_ticks => 1, |
dclrs => [split(',',&get_env('Colors', |
tick_length => 0, |
$colordefaults))], |
x_ticks => 0, |
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title => $Title, |
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y_max_value => $Max, |
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x_label_skip => $skip_x, |
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x_tick_offset => $x_tick_offset, |
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# |
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dclrs => \@Colors, |
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bar_width => $bar_width, |
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cumulate => 2, |
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zero_axis => 1, |
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fgclr => 'black', |
fgclr => 'black', |
boxclr => 'white', |
boxclr => 'white', |
accentclr => 'dblue', |
accentclr => 'dblue', |
Line 159 if (! $MyGraph->set( x_label =>
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Line 140 if (! $MyGraph->set( x_label =>
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b_margin => 10, |
b_margin => 10, |
r_margin => 10, |
r_margin => 10, |
t_margin => 10, |
t_margin => 10, |
# |
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transparent => 0, |
transparent => 0, |
)) { |
); |
$error = $MyGraph->error; |
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print <<"END"; |
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Content-type: text/html |
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<html> |
$GraphSettings{'x_label_skip'} = &get_env('xskip',1); |
<head><title>Bad Graph</title></head> |
$GraphSettings{'x_tick_offset'} = &get_env('x_tick_offset',0); |
<body> |
$GraphSettings{'y_max_value'} = &get_env('y_max_value',1); |
<p> |
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There was an error producing the graph you requested. |
my $MyGraph; |
</p><p> |
if ($PlotType eq 'bar') { |
$error |
# Pick up bar graph settings |
</p> |
$GraphSettings{'bar_width'} = &get_env('bar_width',undef); |
</body> |
$GraphSettings{'long_ticks'} = 1; |
</html> |
$GraphSettings{'tick_length'} = 0; |
END |
$GraphSettings{'x_ticks'} = 0; |
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$GraphSettings{'cumulate'} = 2; |
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$GraphSettings{'zero_axis'} = 1; |
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} else { |
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# |
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# X label skip setup |
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my $skip_x = &get_env('xskip',1); |
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my $x_tick_offset = &get_env('x_tick_offset',$skip_x-1); |
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my $zero_axis = &get_env('zero_axis',1); |
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# |
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# Fill up %GraphSettings |
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$GraphSettings{'long_ticks'} = 1; |
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$GraphSettings{'tick_length'} = 0; |
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$GraphSettings{'x_ticks'} = &get_env('x_ticks',0),; |
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$GraphSettings{'x_label_skip'} = $skip_x; |
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$GraphSettings{'x_tick_offset'} = $x_tick_offset; |
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$GraphSettings{'zero_axis'} = 1; |
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if (&get_env('two_axes',0)) { |
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$GraphSettings{'two_axes'} = 1; |
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$GraphSettings{'y1_label'} = &get_env('y1_label', |
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$GraphSettings{'y_label'}); |
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$GraphSettings{'y2_label'} = &get_env('y2_label',''); |
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$GraphSettings{'y1_max_value'} = &get_env('y1_max_value',0); |
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$GraphSettings{'y1_min_value'} = &get_env('y1_min_value',1); |
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$GraphSettings{'y2_max_value'} = &get_env('y2_max_value',1); |
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$GraphSettings{'y2_min_value'} = &get_env('y2_min_value',1); |
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} |
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} |
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# |
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# Pick up miscellanious values passed in by the user |
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# |
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# Create the plot and check it out |
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if ($PlotType eq 'bar') { |
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$MyGraph = GD::Graph::bars->new($width,$height); |
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} else { |
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$MyGraph = GD::Graph::lines->new($width,$height); |
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} |
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if (! defined($MyGraph)) { |
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print &error('Unable to create initial graph'); |
return; |
return; |
} |
} |
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my $plot = $MyGraph->plot(\@data); |
## |
if (! defined($plot)) { |
## Build the @Data array |
print <<"END"; |
my $NumSets = &get_env('NumSets'); |
Content-type: text/html |
my @Data; # stores the data for the graph |
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my @Legend; # one entry per data set |
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my @xlabels = split(',',&get_env('labels')); |
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push(@Data,\@xlabels); |
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for (my $i=1;$i<=$NumSets;$i++) { |
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push(@Data,[split(',',&get_env('data.'.$i))]); |
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push(@Legend,&get_env('data.'.$i.'.label',undef)); |
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} |
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<html> |
my $error = ''; |
<head><title>Bad Graph</title></head> |
if (! $MyGraph->set(%GraphSettings)) { |
<body> |
print &error($MyGraph->error); |
The system was unable to create the graph you requested. |
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</body> |
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</html> |
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END |
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return; |
return; |
} |
} |
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if (join('',@Legend) ne '') { |
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$MyGraph->set_legend(@Legend); |
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} |
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my $plot = $MyGraph->plot(\@Data); |
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if (! defined($plot)) { |
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my $error = 'Unable to plot the data provided.'; |
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# Debugging code: |
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# $error .= '<pre>'.join(',',@{$Data[0]}).'</pre>'; |
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# $error .= '<pre>'.join(',',@{$Data[1]}).'</pre>'; |
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# $error .= '<pre>'.join(',',@{$Data[2]}).'</pre>' if (ref($Data[2])); |
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# $error .= '<pre>'.join(',',@{$Data[3]}).'</pre>' if (ref($Data[3])); |
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print &error($error); |
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exit; |
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} |
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my $BinaryData=$plot->png; |
my $BinaryData=$plot->png; |
undef($MyGraph); |
undef($MyGraph); |
undef($plot); |
undef($plot); |
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if (! defined($BinaryData)) { |
if (! defined($BinaryData)) { |
print <<"END"; |
print &error('Unable to render graph as image'); |
Content-type: text/html |
exit; |
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<html> |
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<head><title>Bad Graph</title></head> |
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<body> |
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The system was unable to produce a png image of the graph you requested. |
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</body> |
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</html> |
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END |
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return; |
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} |
} |
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# Tell the server we are sending a png graphic |
# Tell the server we are sending a png graphic |
print <<END; |
print <<END; |
Content-type: image/png |
Content-type: image/png |