Abstract
To realize the software functional module in pattern generator,this paper gave a new data structure,doubly-connected edge list,and a well-designed composite algorithm of the sub-regions by using the plane sweep algorithm in computational geometry. In that algorithm,a general approach was given to process any situation appearing in sub-regions composition. To find the internal-hollowed polygon,a discriminate method and a search method were proposed based on graph reconstruction. The time complexity in this algorithm has a logarithmic item and linear space complexity,better than the quadratic one. The data structure is easy to realize in PCs because it is mainly composed of pointers and linked-lists.
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