privatevoid Form2_Load(object sender, EventArgs e)
{
//初始化调用不规则窗体生成代码
//BitmapRegion br = new BitmapRegion();//此为生成不规则窗体和控件的类 Bitmap b =new Bitmap("..\\..\\Resources\\backPic.bmp");
BitmapRegion.CreateControlRegion(this, b);
}
C# code
publicclass 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>publicstaticvoid 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elseif (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>privatestatic 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Xint 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;
}
}
