here is some articles, FYI
http://www.ekany.com/wdg98/cg/contents/chapter2/les231.htm
http://www.ekany.com/wdg98/cg/contents/chapter8/les822.htm
http://algorithm.myrice.com/problems/problem_set/polygon/problem.htm
http://www.ekany.com/wdg98/cg/contents/chapter2/les231.htm
http://www.ekany.com/wdg98/cg/contents/chapter8/les822.htm
http://algorithm.myrice.com/problems/problem_set/polygon/problem.htm
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