对于空地左键单击后会产生障碍，对障碍左键单击会消除障碍，对于起点，两次左键盘单击会消除起点，如果不存在起点，单击右键会产生起点，如果存在起点不存在终点，单击右键会产生终点，如果既存在起点又存在终点，单击右键会消除终点，点击开始寻路回画出路径-For space left click on to generate barrier of the obstacles left click on will eliminate obstacles, for starting point, two left key dish click will eliminate the starting point, if there is no starting point and click on the right will produce the starting point, if there are starting point does not exist end point, click on the right will produce the end point, if there is the starting point and end point there, click on the right will eliminate the end, click start found their way back to draw a path