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《CHINESE JOURNAL OF COMPUTERS》 1998-02
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SIMPLICITY, ORIENTATION, AND INCLUSION TEST ALGORITHMS FOR POLYGONS

WANG Zhi-Qiang; XIAO Li-Jin ;HONG Jia-Zhen(Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200030)(State Key Laboratory of Vibration. Shock and Noise, Shanghai Jiao Tong University, Shanghai 200030)  
This paper solves the two-dimension problems in three-dimensionspace, therefor gets a simple equation for determining the position of a pointrelative to an oriented line segment. Based on the equation, the convex and concavequality of a polygon's venices and the relation of convex venices and concavevenices with the orientation of polygon, a simple and efficient algorithm for theorientation test of simple polygon is presented, it can deal with not only 2D problems,but also 3D problems. Based on this equation and the scan line method, the specialquadrilateral area for the inclusion test of simple polygon is found. This set ofalgorithms are simple, efficient and robust, it is not necessary that solving equationsystems and using trigonometric functions. Comparisons of these algorithms withthe latest algorithms are given in the end of this paper. These algorithms have thefollowing features: 1) They are easy to program and require the minimumcalculation. They are more efficient and faster than the latest algorithms. The more thereare venices of a polygon, the more efficient the algorithms are; 2) Thesealgorithms will not cause extra cases and can be used universally.
【Fund】: 国家自然科学基金;;国家教委博士点专项基金
【CateGory Index】: TP391
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