Chart::Gnuplot CGI

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I want to use Chart::Gnuplot to plot a chart on the fly. The user will click on a link that will output the chart to screen.
At the moment I have the following relevant code defined:

my $chart = Chart::Gnuplot->new(
        output => "/home/dir/www/Plots/$node.$ran.$kpi.$interface.png"
+, 
        ....
[download]

The correct permissions are required (cgi user) to output to the directory. Any ideas on how to overcome the permission problem and output directly to the webpage instead of to a file?

Comment on Chart::Gnuplot CGI Download Code

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Re: Chart::Gnuplot CGI by Anonymous Monk on Mar 15, 2011 at 07:09 UTC
output directly to the webpage instead of to a file? 1) binmode STDOUT; 2 ) don't specify a filename, and the output will go directly to stdout, but it will be in postscript 3) if you want a different format, you will have to pipe to convert, this will require patching Chart::Gnuplot or something	[reply]
Re: Chart::Gnuplot CGI by Anonymous Monk on Mar 17, 2011 at 03:15 UTC
Add the following line when you initiate the chart object: `terminal => 'svg',` and don't specify the filename. Then it will output the chart to STDOUT in SVG format. You can then embed the SVG code in the HTML file directly.	[reply] [d/l]