(急)C#,GDI+绘图时,如何给两个多边形之间的区域填充颜色?

Question

如题,两个不规则多边形之间的区域(小多边形在大多边形内),需要填充颜色,如何使用GDI+做到?

Answer 1

private void button3_Click(object sender, System.EventArgs e)
        {
            Graphics gp=this.pictureBox1.CreateGraphics();
            Rectangle rect1=new Rectangle(5,5,105,105);
            Rectangle rect2=new Rectangle(35,35,45,45);            gp.DrawRectangle(new Pen(Color.Green),rect1);
            gp.DrawRectangle(new Pen(Color.Red),rect2);            GraphicsPath path=new GraphicsPath();
            path.AddRectangle(rect1);
            path.AddRectangle(rect2);
            //Region rg=new Region(path);
            SolidBrush sbrush=new SolidBrush(Color.Blue);
            gp.FillPath(sbrush,path); 
            
        }

Answer 2

添加引用：
using System.Drawing.Drawing2D ;
界面上需要拉入控件：pictureBox
自己再琢磨一下吧

Answer 3

GraphicsPath path = new GraphicsPath();
            Point[] p = new Point[] { new Point(2, 2), new Point(2, 100), new Point(100, 100), new Point(100, 2), new Point(2, 2) }; //大多边形
            Point[] b = new Point[] { new Point(20, 20), new Point(80, 20), new Point(80, 80), new Point(20, 70), new Point(20, 20) }; //小多边形            path.AddLines(p);
            path.AddLines(b);
            Graphics g = this.CreateGraphics();
            g.FillPath(Brushes.Red, path);