怎么判断多个点在一个封闭曲线的内部

[Tina1sg]

如何判断多个点在一个封闭曲线的内部，求前辈指导，谢谢啦

[白玉剑]

判断多个点和判断一个点是同样的原理呀，这个问题就是判断一个点是否在多边形内，可以通过射线法来判断，网上有很多的。

[赵4老师]

PtInRegion The PtInRegion function determines whether the specified point is inside the specified region. BOOL PtInRegion( HRGN hrgn, // handle to region int X, // x-coordinate of point int Y // y-coordinate of point ); Parameters hrgn Handle to the region to be examined. X Specifies the x-coordinate of the point. Y Specifies the y-coordinate of the point. Return Values If the specified point is in the region, the return value is nonzero. If the specified point is not in the region, the return value is zero. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Requires version 1.0 or later. Header: Declared in wingdi.h. Import Library: Use gdi32.lib. See Also Regions Overview, Region Functions, RectInRegion

[schlafenhamster]

CRgn::PtInRegion BOOL PtInRegion( int x, int y ) const; BOOL PtInRegion( POINT point ) const; Return Value Nonzero if the point is in the region; otherwise 0. Parameters x Specifies the logical x-coordinate of the point to test. y Specifies the logical y-coordinate of the point to test. point The x- and y-coordinates of point specify the x- and y-coordinates of the point to test the value of. The point parameter can either be a POINT structure or a CPoint object. Remarks Checks whether the point given by x and y is in the region stored in the CRgn object. 用闭合曲线做个 Rgn