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Posted by Malcolm Dew-Jones on 09/26/05 23:11
langhammer@gmail.com wrote:
: Hi,
: anybody knows a good class who makes possible to create charts as
: line-graph ?
: Mostly I can find only classes to include with more as 50kilobytes. But
: I need a small programm, because I have 750 users in one moment.
: The most classes includes pie,circles,... so they are to big.
Not clear what you have tried.
Do you mean a php class to create a gif/jpeg/etc image of a chart?
Or a Java class for an applet to display on the browser.
Or a Javascript class to do whatever it does.
Read up on gnuplot. It can create all sorts of graphs and output various
output formats. Being a compiled program it is fast to run. Since it
runs as a standalone program (i.e. not part of your application) then
there are no GPL licensing issues.
Display the graph as an image ( <img src="a-script.phgp" /> ). The php
script needs input which I don't show, either query params or session
data. Your php script will accept the input and prepare the gnuplot data
(typically just a few lines in a text file). Then your php shells out to
gnuplot with that as its input, gnuplot generates the binary image data
you need. I don't recall if gnuplot displays that data on stdout (in
which case you need do nothing) or whether you have to spool a work file,
but either way is pretty easy.
--
This programmer available for rent.
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