本例演示了如何使用CreatePolygonRgn函数建立不规则的热区，PtInRegion判断鼠标是否在热区之内。-the cases demonstrate how to use the function to establish CreatePolygonRgn irregular fever, PtInRegion judge whether the mouse within the hot zone.

用VC实现tin的建立,用于对自动建立不规则三角形-Tin with the VC to achieve the establishment of an irregular triangle is used to automatically create