[Image-SIG] PIL floodfill?

[Matthew Belk]

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Hello All,

I would first like to say that I am a complete fan of PIL.  I work for
the National Weather Service in Charleston WV.  Using PIL, I was finally
able to add some features to our web site like plotting polygons of
tornado warnings and the like.  This has made it much easier for the
users of our web site to get potentially life-saving information much
faster.  The WV Office of Emergency Services uses our site heavily as a
result.  Thank you Mr. Lundh!

That said, I was wondering if there is a flood fill feature in PIL?   I
am using PIL 1.0 with Python 1.5.2.  I have searched the PIL
documentation and these archives, but I must have missed something
somewhere.

What I am doing is taking an image of a state, complete with counties.
I would like to be able to fill in any of the counties with a color.  I
have already written a routine to do it point by point, but I am not
really happy with it since it fails on some of the more complex county
shapes.  It is also heavily dependent upon where you start filling in
the county.  I keep thinking there has to be a better way.

One idea I had was to find the border of a county and then redraw it as
a filled polygon.  Am I on the right track?  Any better ideas would be
appreciated.  I would like to distribute this software to other NWS
offices soon.

Thanks in advance,

Matthew Belk
Meteorologist NWS Charleston WV


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