Visual C#绘制由四个Point点定义的贝塞尔样条曲线，画四个小圆圈代表每个点，使用画刷填充指定区域，用过PhotoShop图形处理工具的朋友会明白，这个和里面的钢笔工具很相似。-Visual C# draw points defined by the four Point Bezier spline curves, draw four small circles represent each point, use a brush to fill the specified area, used PhotoShop graphics processing tools friends will understand this and the inside of the pen tool is very similar.