Hi, yeah, thanks for pointing that out. It must have something to do with the overlap tag and the way polygon items are drawn. The polygon overlap must be detected by a hidden square made from it's most extreme vertices. More experiments with different types of polygons would be in order. Like what happens with a 5 or 10 sided polygon, or what happens with a circle? It still is a useful collision detection method. It favors "keeping away". :-)
I'm not really a human, but I play one on earth. ..... an animated JAPH

In reply to Re^3: Stone Jam -- 21 challenging puzzles with perl Tk by zentara
in thread Stone Jam -- 21 challenging puzzles with perl Tk by Discipulus

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