最后系统采用参数化技术以及零部件拼装的方法绘制设备整体结构装配图，给出了参数化绘图的方法以及消隐的实现。

At last the system completes the assembly drawing of equipments using the parameterized technology and the method of parts scrabbling. The parameterized drawing and hiding are realized.

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对投影矩阵和消隐算法等进行了改进，使计算机处理图形的速度得到了很大的提高，同时使最后得到的图形更能准确的显示用户所关心的问题。

Enhance the speed of the computer in process graphics by upgrade the projection matrix and Visible-surface detection, and let the graphics achieved show the problem that user care most.

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