OGL documentation?

Hello !

I read the pydbdesigner source(http://pydbdesigner.sf.net) and cannot
understand what

wxShapeRegion.SetProportions(1.0, 0.25)

mean.

Could anyone tell me where can I find a good OGL documentation?
I've downloaded wxPythonDocs-2.4.0.2.tar.gz there was an ogl.zip with
OGL docs but wxShapeRegion doesn't included.

Thanks
     Attila Szuts