射影点的几何作图

GEOMETRIC CONSTRUCTION OF PROJECTIVE POINTS

在射影平面的扩大平面模型上的已知射影坐标系下，本文解决了已知射影坐标，几何地作出它所对应的点；已知一射影点，几何地求出这个点的射影坐标三数组这两类基本问题。

Under a system of projective coordinates of the extended plane which is model of projective plane,we can plot the point,if projective coordinate of this point is given;find coordinate of the point using geometric method, if geometric pasifion of this point is given.