根据所给的平面三视图，用graphics画出图像的正轴测图。-According to three-view plane, draw the image is isometric.

CAD三维制图 三维绘图术语和坐标系 ◆视图观测点的设立方法 ◆绘制三维点和曲线 ◆绘制三维网格 ◆绘制三维实体 ◆通过二维对象创建三维对象 -◆ view observation points set up method of CAD 3D drawing 3D graphics terminology and coordinate system ◆ draw the 3D points and curves In ◆ draw three-dimensional

Lisp语言，在CAD中将指定的图形绘制三维轴视图！-Lisp, specified in the CAD graphics rendering 3 d axis view!