根据位图绘制控件外观

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;
  
        }



private void simpleButton1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            this.simpleButton1.Cursor = Cursors.Hand;
            Bitmap bmpBob =(Bitmap)this.simpleButton1.Image;      
            GraphicsPath graphicsPath = CalculateControlGraphicsPath(bmpBob);
            this.simpleButton1.Region = new Region(graphicsPath);  
        }