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  collision between polygons  (Read 1855 times)
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Offline jaqob

Innocent Bystander

Java games rock!

« Posted 2003-02-28 05:52:53 »

How do i check if two polygons hit each other?

like polygon1.contains(polygon2)

I cant find any Method in the api that does that
Offline ryanm

Senior Devvie

Projects: 1
Exp: 15 years

Used to be bleb

« Reply #1 - Posted 2003-02-28 06:47:01 »

The easiest way is to check all the vertices of one polygon to see if they lie inside the other polygon using the contains( x, y ) method.

However, this method is slow O( n * m ), where poly1 has n vertices and poly2 has m vertices, and can give an incorrect result ( think about two triangles in a star of David type formation ).

The more complex way is use a sweep-line strategy to check if any of the polygon edges intersect.  This method will find all cases of polygon intersection and runs in O( p * log p ) , where p = n + m.

If you google for "line intersection" and "sweep line" something may turn up.  It is also detailed in "Introduction to Algorithms" by three guys whos names i can't remember???, but their initials were C, L and R Tongue

If you don't find anything, come back here and I'll put up an explanation about how it works when i have more time.
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