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SoCoder -> Snippet Home -> Misc


 
Phoenix
Created : 25 February 2010
Edited : 25 February 2010

Iterating edges of a polygon



This is neat and trivial trick I found the other day which is useful when you want to iterate through consecutive pairs of vertices (edges) of a polygon. i is the index of the first vertex, and j is the index of the following vertex.

This connects the last and the first vertex without you having to add a special case after the loop. Amazing, isn't?

 

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