1.程序运行时显示出正四面体的图像，它是3D的分形图形。

2.鼠标左键点住图形，背景颜色改变，当松开鼠标时背景颜色变回默认值，图形仍然留在原处；

3.点击鼠标右键，图形会逐渐变小缩小，当图形足够小的时候又会变成初始大小，如此循环往复。

-1. The program is running the image shows regular tetrahedron, which is the 3D fractal graphics. 2. The left mouse button point of live graphics, background color change, when the background color changes when you release the mouse back to the default value, and graphics remain in situ　3. Click the right mouse button, graphics will gradually become smaller reduced, the time when the graph is small enough will become the initial size and so on ad infinitum.