实现三维对象的平移，旋转变换，以及投影变换。 程序运行按键说明：a,s,d,w四键产生平移变换，x,X,y,Y,z,Z六键产生旋转变换，PageUp使镜头拉进，PageDown键使镜头推远。-3D object translation, rotation transformation, and the projection transformation. Running Press : a, s, d, w 4 keys generated translation transform, x, x, y, Y, z, Z six key rotation transform, Page dragged into the lens, the lens Prompt button pushed far.