With some examples in plane geometry, the author indroduces how to use Desargues theorem to simplify the proofs of problems of collinear points and concurrent lines.
利用代沙格定理及其逆定理 ，对平面几何的几个共线点和共点线的问题给出简捷的证法。
Editing in 3d environment by a digital control plane, the method can deal with some geometry efficiently, such as point, line, and polygon, etc.
由数字控制平面的3d环境中的编辑，该方法可以处理一些几何效率，如点，线，多边形等。
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