asp.net 图片 画线

Bitmap srcImg = new Bitmap(300, 300); //也可以读入一张图片
Graphics graphics = Graphics.fromImage(srcImg);
Font font = new Font("宋体", 16); //字体与大小
Brush brush = new SolidBrush(Color.Red);
graphics.DrawString("www.cftea.com", font, brush, 50, 50); //写字，最后两个参数表示位置
Pen pen = new Pen(Color.fromArgb(33, 66, 99), 10); //颜色与宽度
Point[] pts = new Point[3]; //曲线的点
pts[0] = new Point(120, 130);
pts[1] = new Point(140, 280);
pts[2] = new Point(200, 100);
graphics.DrawCurve(pen, pts); //画曲线
srcImg.Save(Server.MapPath("example.jpg"));
graphics.Dispose();
srcImg.Dispose();