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C#制作任意不规则按钮2011-01-29using 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