一个判断当在窗体上点击鼠标时，鼠标和直线的位置关系：在线上、或线的顺时针方向、或是在逆时针方向。c++ builder 6.-when a judge in Window on the clicking of the mouse, the mouse and linear position : on-line, Line or clockwise direction, or in an anti-clockwise. C builder 6.