C# 制作出任意不规则按钮! (原理根据背景图绘制button)

using System.Drawing.Drawing2D;
private void button3_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{ this.button3.Cursor = Cursors.Hand;
         Bitmap bmpBob =(Bitmap)this.button3.Image;
      GraphicsPath graphicsPath = CalculateControlGraphicsPath(bmpBob);
     this.button3.Region = new Region(graphicsPath);
}
private static GraphicsPath CalculateControlGraphicsPath(Bitmap bitmap)
{

   GraphicsPath graphicsPath = new GraphicsPath();

   Color colorTransparent = bitmap.GetPixel(0, 0);

   int colOpaquePixel = 0;

   for(int row = 0; row < bitmap.Height; row ++)
   {

    colOpaquePixel = 0;

    for(int col = 0; col < bitmap.Width; col ++)
    {

     if(bitmap.GetPixel(col, row) != colorTransparent)
     {

      colOpaquePixel = col;

      int colNext = col;

      for(colNext=colOpaquePixel; colNext<bitmap.Width; colNext++)
       if(bitmap.GetPixel(colNext, row) == colorTransparent)
        break;

      graphicsPath.AddRectangle(new Rectangle(colOpaquePixel,
       row, colNext - colOpaquePixel, 1));

      col = colNext;
     }
    }
   }

   return graphicsPath;
}
http://www.cnblogs.com/zengping/archive/2006/08/30/490720.html