；生成界面上有三个按钮，Add**Move,为左键增加点，右键拖动点；Move**Add,为右键增加点，左键拖动点；Clear为清楚界面上所有的点和曲线！ 其实这是我得一门选修课的作业！欢迎指教！- Generated interface has three buttons, Add** Move, increased points for the left, right drag the point Move** Add, for the right to increase, the le