Alain,

The project I will email you was designed to do the job of working out if a point is inside or outside a given closed polygon. The polygon could be pseudo-randomly generated or hand drawn (sorry project has no help file). If hand drawn, you can make interesting shapes like square spirals and so on which are usually quite hard for even a human to tell if a point is inside or outside.

However the polygon is generated, I allow the user to save it to file and reload it later. Nothing fancy here - just simple file formats.

It may contain something useful to you or may not. I am interested in the topic you have raised and will do some investigation. Keep us informed.

Cheers
Paul Lewis