不规则按钮(C#).doc

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;/Html/chtml 上面的代码测试效果不好，放上一个老外写的类，下过好一点：using System;using System.Drawing;using System.Drawing.Drawing2D;using System.Windows.Forms;namespace BitmapRegionTest / / Summary description for BitmapRegion. / public class BitmapRegion public BitmapRegion() / / Create and apply the region on the supplied control / / The Control object to apply the region to / The Bitmap object to create the region from public static void CreateControlRegion(Control control, Bitmap bitmap) / Return if control and bitmap are null if(control = null | bitmap = null) return; / Set our controls size to be the same as the bitmap control.Width = bitmap.Width; control.Height = bitmap.Height; / Check if we are dealing with Form here if(control is System.Windows.Forms.Form) / Cast to a Form object Form form = (Form)control; / Set our forms size to be a little larger that the bitmap just / in case the forms border style is not set to none in the first place form.Width += 15; form.Height += 35; / No border form.FormBorderStyle = FormBorderStyle.None; / Set bitmap as the background image form.BackgroundImage = bitmap; / Calculate the graphics path based on the bitmap supplied GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap); / Apply new region form.Region = new Region(graphicsPath); / Check if we are dealing with Button here else if(control is System.Windows.Forms.Button) / Cast to a button object Button button = (Button)control; / Do not show button text button.Text = ; / Change cursor to hand when over button button.Cursor = Cursors.Hand; / Set background image of button button.BackgroundImage = bitmap; / Calculate the graphics path based on the bitmap supplied GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap); / Apply new region button.Region = new Region(graphicsPath); / / Calculate the graphics path that representing the figure in the bitmap / excluding the transparent color which is the top left pixel. / / The Bitmap object to calculate our graphics path from / Calculated graphics path private static GraphicsPath CalculateControlGraphicsPath(Bitmap bitmap) / Create GraphicsPath for our bitmap calculation GraphicsPath graphicsPath = new GraphicsPath(); / Use the top left pixel as our transparent color Color colorTransparent = bitmap.GetPixel(0, 0); / This is to store the column value where an opaque pixel is first found. / This value will determine where we start scanning for trailing opaque pixels. int colOpaquePixel = 0; / Go through all rows (Y axis) for(int row = 0; row bitmap.Height; row +) / Reset value colOpaquePixel = 0; / Go through all columns (X axis) for(int col = 0; col bitmap.Width; col +) / If this is an opaque pixel, mark it and search for anymore trailing behind if(bitmap.GetPixel(col, row) != colorTransparent) / Opaque pixel found, mark current position colOpaquePixel = col; / Create another variable to set the current pixel position int colNext = col; / Starting from current found opaque pixel, search for anymore opaque pixels / trailing behind, until a transparent pixel is found or minimum width is reached for(colNext = colOpaquePixel; colNext bitmap.Width; colNext +) if(bitmap.GetPixel(colNext, row) = colorTransparent) break; / Form a rectangle for line of opaque pixels found and add it to our graphics path graph