本例子实现画立方体的例子，多面体可以参考此程序，程序实现了三维立体图形的旋转，平移和缩放，旋转通过鼠标左键实现，平移通过方向键实现，缩放通过鼠标滚轮实现-The example painted cube example, the polyhedron can refer to this program, the program to achieve a rotation of three-dimensional graphics, pan and zoom, and rotate the lef