vb编写组态软件，之鼠标拖动虚线框代码，本人用过-vb prepared by the configuration software, the mouse to drag the dashed box code

基于mfc用bresenham算法画的直线，可以用鼠标拖动，预览直线。-on mfc use bresenham paint line-Based mfc with bresenham algorithm painting a straight line, you can use the mouse to drag the preview straight line.-On mfc use bresenham paint line