下面为路径渐变画刷的基本使用，构建一个中心点为红色的五角星：

private void Form1_Paint(object sender, PaintEventArgs e)  
       {  
           Graphics g = e.Graphics;  
           g.Clear(Color.White);  
  
           //构造五星的10个边的端点坐标  
           Point[] points =  
           {  
               new Point(75,0),new Point(100,50),  
               new Point(150,50),new Point(112,75),  
               new Point(150,150),new Point(75,100),  
               new Point(0,150),new Point(37,75),  
               new Point(0,50),new Point(50,50),  
               new Point(75,0)  
  
           };  
  
           //创建路径  
           GraphicsPath path = new GraphicsPath();  
  
           //在路径中添加直线  
           path.AddLines(points);  
  
           //创建路径渐变画刷  
           PathGradientBrush pathBrush = new PathGradientBrush(path);  
  
           //设置中心点颜色  
           pathBrush.CenterColor = Color.Red;  
  
           //设置每个端点的色彩  
           Color[] colors =   
          {  
             Color.Black,Color.Green,  
             Color.Blue,Color.White,  
             Color.Black,Color.Green,  
             Color.Blue,Color.White,  
             Color.Black,Color.Green  
           };  
  
           //设置路径渐变画刷的边缘色  
           pathBrush.SurroundColors = colors;  
  
  
           g.TranslateTransform(100,100);  
           g.FillPath(pathBrush,path);  
  
           //显示释放资源  
           path.Dispose();  
           pathBrush.Dispose();  
       } 

原文摘自CSDN