说明：  ACAD中多段线X、Y坐标根据绘图比例的有序输出，本程序为选取一条、输出一条，因选取速度慢于计算、输出速度，所以感觉不到，却是非常实用的，比选取多条后必须点鼠标右键确认选取结束要方便、实用的多。
(ACAD in the multi-segment lines X, Y coordinates in an orderly manner in accordance with the drawing ratio of the output, the procedure for selecting an output one, slow due to select the calculation, the output speed, so do not feel it is very practical, than select the number of points after the end of the right mouse button to confirm selected to be convenient, practical and more.)