AutoCAD软件的二次开发中涉及到坐标系转换的Lisp程序

六、坐标系转换 (trans pt from to [disp]) 说明： pt：A list of three reals that can be interpreted as either a 3D point or a 3D displacement (vector). from：An integer code, entity name, or 3D extrusion vector identifying the coordinate system in which pt is expressed. The integer code can be one of the following: 0  World (WCS) 1  User (current UCS) 2  If used with code 0 or 1, this indicates the Display Coordinate System (DCS) of the current viewport. When used with code 3, it indicates the DCS of the current model space viewport. 3  Paper space DCS (used only with code 2) to：An integer code, entity name, or 3D extrusion vector identifying the coordinate system of the returned point. See the from argument for a list of valid integer codes. 例：用getpoint函数获取点后，将该点转换为世界坐标系下的点。 (setq pnt (getpoint “输入点：”))(trans pnt 1 0) 7. 3 AutoLISP与AutoCAD的通信