使用GDI实现平面坐标的绘制，并且能计算鼠标点选的行列，左键在对应的矩形框画实心圆或取消，右键在对应的矩形画空心圆或取消-Use GDI drawing plane coordinate implementation, and can calculate the ranks of the mouse click, left in the corresponding rectangle painted solid round or cancel, right in the correspondin