How to generate graphics dynamically on the web using Python CGI script?
steve at holdenweb.com
Fri Jan 20 05:35:02 EST 2006
Debashis Dey wrote:
> I have a python CGI program. I would like to show a graph within a HTML
> plage. I would like to dynamically generate the graph using the python
> CGI script on the web server side and send it to the browser.
> My question is how can I do this in python? Is there a free tool to do
> this? Can someone please send me some simple python code to draw simple
> graphics within HTML (e.g. draw a line or a circle).
Unfortunately HTML does not include graphics facilities, simply the
ability to refer to graphical resources.
The typical way to include a created graphic would be:
1. Create a (.png, .jpg, .gif) file showing the
image you want
2. Store it in a temporary file whose name will be
unique to the current session
3. Generate an HTML response including an <IMG ...>
tag referring to the newly created graphic
Step 1, which is what you seem to be asking about, can be handled by a
number of packages, perhaps the best-known of which is PIL, the Python
Imaging Library - see
This is open source, and available at no cost. There's a wealth of
information on how to use it on the web, and many regular readers of
this group are skilled with it!
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.python.org/pycon/
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