void ConvexHull(Point s[],int nums,Point result[],int& resultnums) { sortpoint(s,nums); resultnums = 0; if(nums<=3) { for(int i=0;i<nums;i++) result[resultnums++] = s[i]; return; } int top=0; int i; for(i=0;i<2;i++) result[top++] = s[i]; while(i<nums) {...
凸包 凸包(Convex Hull)是一个计算几何(图形学)中的概念。点集Q的凸包是指一个最小凸多边形,满足Q中的点或者在多边形边上或者在其内。正式讨论凸包问题...
凸包(Convex Hull)是一个计算几何(图形学)中的概念。用不严谨的话来讲,给定二维平面上的点集,凸包就是将最外层的点连接起来构成的凸多边型,它能包含点集中所有点的。严谨的定义和相关概念参见维基百科:凸包。 也被称为:Graham/Andrew Scan 算法。在二维欧几里得空间中,凸包可想象为一条刚好包着所有点的橡皮圈。
Graham Scan算法的做法是先定下一个起点,一般是最左边的点和最右边的点,然后一个个点扫过去,如果新加入的点和之前已经找到的点所构成的“壳”凸性没有变化,就继续扫,否则就把已经找到的最后一个点删去,再比较凸性,直到凸性不发生变化。分别扫描上下两个“壳”,合并在一起,凸包就找到了。这么说很抽象,我们看图...
Graham Scan Algorithm With the basics in place, we are ready to understand the Graham Scan Convex Hull algorithm. The steps in the algorithm are: Given a set of points on the plane, find a point with the lowest Y coordinate value, if there are more than one, then select the one with...
Learn how to implement the Graham Scan algorithm in C++ to efficiently find the convex hull of a set of points.
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