用vc.net编的程序，鼠标操作的动画,鼠标左键按下，图形旋转，松开后停止-vc.net series with the procedures, mouse operation of the animation, the left mouse button pressed, graphics rotation after the loose

这是计算机图形学中三维图形旋转程序，分别绕x轴、y轴、z轴旋转，仅供教学使用。-This is a three-dimensional computer graphics in graphic rotation procedures, respectively, around the x-axis, y-axis, z-axis rotation, for teaching use.