本程序是使用VisualC#编制的一个投影变换演示程序，实现从3D长方体投影至2D平面的图形绘制,并演示了图形绕轴旋转的过程。-use of this procedure is the establishment of VisualC# 1 Projection Demonstration Program, D. realized from three to two rectangular projection plane D graphics rendering, and presentation graphics around the axis of rotation process.