文件名称:PointLine
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计算二维上点到直线段之间的最短距离。如果是直线那么连垂线就是最短距离，但直线段则不然。-Calculated on two-dimensional point to a straight line the shortest distance between the paragraph. Well, even if it is a straight line perpendicular is the shortest distance, but the line segment is not.
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PointLine.cpp