
Geometry : 
Subject: Re: [geometry] Split Polygon
From: Alessandro Ranellucci (alex_at_[hidden])
Date: 20130819 14:14:03
Hunk <heiko.hoennige_at_[hidden]> wrote:
> i want to split the Polygon ABCDEF with a line. (origin and direction
> vector)
> For that i have to calculate the Line Polygon interesection. That i get the
> points G and H
> after that i have to extract the two Polygons GEFAH and HBCDG
I would compute the axisaligned bounding box of the original polygon, and then clip it using your cutting line.
For example, I'd make a polygon with the following coordinates:
[minX,minY], [Hx,minY], [Hx,Hy], [Gx,Gy], [Gx, maxY], [minX,maxY]
Therefore, your left polygon is the intersection of the original one with this one, and the right one is the difference.
 Alessandro
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