clinographic projection

The traditional algorithm for checking point in polygon is not convenience,then a convenience algorithm——sloping line method is presented.

介绍了一个易于实现的点包容性检测算法——倾斜射线法,其特点是射线不会与多边形的顶点或边重合,无须作特殊情况的处理,需计算的区域小,因而计算量小。

A convenience algorithm for point and line in polygon test,sloping line method is provided,the characteristic of this method is that the sloping line is not match together with any peak or edge of polygon,no special situation is needed processing,the computation is decreased.

以倾斜射线法检测点的包容性,其特点是此射线不与多边形的顶点或边重合,无须作特殊情况的处理,计算区域小,因而计算量小,对自相交多边形及带孔多边形等多类情况同样适用。