不规则窗体

/***************************************************************************************/ // // 功能描述：不规则窗体和控件的生成类 // 撰 写 人：不祥（网上搜集） // // // 修改说明：2005.8.31 杨丹翻译和修改 // /***************************************************************************************/ /* private void login_Load(object sender, System.EventArgs e) { //初始化调用不规则窗体生成代码 BitmapRegion BitmapRegion =new BitmapRegion();//此为生成不规则窗体和控件的类 BitmapRegion.CreateControlRegion(this,new Bitmap("HMlogin.bmp")); } */ using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Drawing.Drawing2D; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; namespace Dll { /// <summary> /// Summary description for BitmapRegion. /// </summary> public class BitmapRegion { public BitmapRegion() { } /// <summary> /// Create and apply the region on the supplied control /// 创建支持位图区域的控件（目前有button和form） /// </summary> /// <param name="control">The Control object to apply the region to控件</param> /// <param name="bitmap">The Bitmap object to create the region from位图</param> public static void CreateControlRegion(Control control, Bitmap bitmap) { // Return if control and bitmap are null //判断是否存在控件和位图 if (control == null || bitmap == null) return; // Set our control''s size to be the same as the bitmap //设置控件大小为位图大小 control.Width = bitmap.Width; control.Height = bitmap.Height; // Check if we are dealing with Form here //当控件是form时 if (control is System.Windows.Forms.Form) { // Cast to a Form object //强制转换为FORM Form form = (Form)control; // Set our form''s size to be a little larger that the bitmap just // in case the form''s border style is not set to none in the first place //当FORM的边界FormBorderStyle不为NONE时，应将FORM的大小设置成比位图大小稍大一点 form.Width = control.Width; form.Height = control.Height; // No border //没有边界 form.FormBorderStyle = FormBorderStyle.None; // Set bitmap as the background image //将位图设置成窗体背景图片 form.BackgroundImage = bitmap; // Calculate the graphics path based on the bitmap supplied //计算位图中不透明部分的边界 GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap); // Apply new region //应用新的区域 form.Region = new Region(graphicsPath); } // Check if we are dealing with Button here //当控件是button时 else if (control is System.Windows.Forms.Button) { // Cast to a button object //强制转换为 button Button button = (Button)control; // Do not show button text //不显示button text button.Text = ""; // Change cursor to hand when over button //改变 cursor的style button.Cursor = Cursors.Hand; // Set background image of button //设置button的背景图片 button.BackgroundImage = bitmap; // Calculate the graphics path based on the bitmap supplied //计算位图中不透明部分的边界 GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap); // Apply new region //应用新的区域 button.Region = new Region(graphicsPath); } } /// <summary> /// Calculate the graphics path that representing the figure in the bitmap /// excluding the transparent color which is the top left pixel. /// //计算位图中不透明部分的边界 /// </summary> /// <param name="bitmap">The Bitmap object to calculate our graphics path from</param> /// <returns>Calculated graphics path</returns> private static GraphicsPath CalculateControlGraphicsPath(Bitmap bitmap) { // Create GraphicsPath for our bitmap calculation //创建 GraphicsPath GraphicsPath graphicsPath = new GraphicsPath(); // Use the top left pixel as our transparent color //使用左上角的一点的颜色作为我们透明色 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. //第一个找到点的X int colOpaquePixel = 0; // Go through all rows (Y axis) // 偏历所有行（Y方向） for (int row = 0; row < bitmap.Height; row++) { // Reset value //重设 colOpaquePixel = 0; // Go through all columns (X axis) //偏历所有列（X方向） for (int col = 0; col < bitmap.Width; col++) { // If this is an opaque pixel, mark it and search for anymore trailing behind //如果是不需要透明处理的点则标记，然后继续偏历 if (bitmap.GetPixel(col, row) != colorTransparent) { // Opaque pixel found, mark current position //记录当前 colOpaquePixel = col; // Create another variable to set the current pixel position //建立新变量来记录当前点 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 ///从找到的不透明点开始，继续寻找不透明点,一直到找到或则达到图片宽度 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 //将不透明点加到graphics path graphicsPath.AddRectangle(new Rectangle(colOpaquePixel, row, colNext - colOpaquePixel, 1)); // No need to scan the line of opaque pixels just found col = colNext; } } } // Return calculated graphics path return graphicsPath; } } }