winform 曲线(贝塞尔)

<span style="font-size:14px;">//覆盖OnPaint事件</span>

<span style="font-size:14px;"> protected override void OnPaint(PaintEventArgs e) {
            Graphics g = e.Graphics;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality & System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;          
            //用四个Label的位置作为四个点
            Point a = new Point(label1.Location.X, label1.Location.Y);   //起始点
            Point z1 = new Point(label2.Location.X, label2.Location.Y);  //控制点
            Point z2 = new Point(label3.Location.X, label3.Location.Y);  //控制点
            Point b = new Point(label4.Location.X, label4.Location.Y);    //结束点
            //通过调整控制点可以调整曲线的弯曲程度
            g.DrawBezier(Pens.Red, a, z1, z2, b);          
        }</span>

图示：

有关贝塞尔曲线的，这个博客不错：( http://blog.csdn.net/conmajia/article/details/8543834)：