一个旋转的3D箱子(动画)

bsp;                                                                    ;
;        Rotate around z-axis                                                  ;
;        XT = X * COS(zang) - Y * SIN(zang) / 256                              ;
;        YT = X * SIN(zang) + Y * COS(zang) / 256                              ;
;        X = XT                                                                ;
;        Y = YT                                                                ;
;                                                                              ;
;   Divide by 256 coz we have multiplyd our sin values with 256 too.           ;
;   This example isn''t too fast right now but it''ll work just fine.            ;
;   &