如何将颜色更改为黑白到屏幕的左上角三角形？ [英] How to change colors to black-white into the top left triangle of the screen?

问题描述

这是我的代码：

  public 位图MakeScreenshot（）
 {
 Bitmap Bitmap =  new 位图（Screen.PrimaryScreen.Bounds.Width，Screen.PrimaryScreen.Bounds.Height）; 
 Graphics Graphics = Graphics.FromImage（Bitmap）; 
 Graphics.CopyFromScreen（ 0 ， 0 ， 0 ， 0 ，Screen.PrimaryScreen.Bounds.Size，CopyPixelOperation.SourceCopy）; 
 
  return 位图; 
} 
 
  //   Reduce Screenshot Method  
  public   static   void  ReduceScreenshot（ string  fileName）
 {
  var  bmpSS = 新的位图（Screen.PrimaryScreen.Bounds.Width，Screen.PrimaryScreen.Bounds.Height）; 
  var  gfxSS = Graphics.FromImage（bmpSS）; 
 gfxSS.CopyFromScreen（Screen.PrimaryScreen.Bounds.X，Screen.PrimaryScreen.Bounds.Y， 0 ， 0 ，Screen.PrimaryScreen.Bounds.Size，CopyPixelOperation.SourceCopy）; 
 
 ColorMatrix colorMatrix =  new  ColorMatrix（
  new   float  [] [] 
 {
  new   float  [] { 1  .5f， 1  .5f， 1  .5f， 0 ， 0 }，
 < span class =code-keyword> new   float  [] { 1  .5f，  1  .5f， 1  .5f， 0 ， 0 }，
  new   float  [] { 1  .5f， 1  .5f， 1  .5f，  0 ， 0 }，
  new   float  [] { 0 ， 0 ， 0 ， 1 ， 0 } ，
  new   float  [] {-1，-1，-1， 0 ， 1 } 
}）; 
 
 ImageAttributes attributes =  new  ImageAttributes（）; 
 attributes.SetColorMatrix（colorMatrix）; 
 Rectangle abc =  new 矩形（-783，-383，bmpSS.Width，bmpSS.Height）; 
 gfxSS.DrawImage（bmpSS，abc，-783，-383，bmpSS.Width，bmpSS.Height，GraphicsUnit.Pixel，attributes）; 
 
 bmpSS.Save（  ScreenshotGray.png，ImageFormat.Png） ; 
} 
 
} 
 

它是如何工作的http://take.ms/6tzvU [ ^ ]。我应该如何将区域从矩形更改为三角形？

解决方案

请参阅 http://www.flipcode.com/archives/Win32_Window_Skinning.shtml [ ^ ]。

Here is my code:

    public Bitmap MakeScreenshot()
    {
        Bitmap Bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
        Graphics Graphics = Graphics.FromImage(Bitmap);
        Graphics.CopyFromScreen(0, 0, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);

        return Bitmap;
    }

    //Reduce Screenshot Method
    public static void ReduceScreenshot(string fileName)
    {
        var bmpSS = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
        var gfxSS = Graphics.FromImage(bmpSS);
        gfxSS.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);

        ColorMatrix colorMatrix = new ColorMatrix(
           new float[][]
           {
               new float[] { 1.5f, 1.5f, 1.5f, 0, 0},
               new float[] { 1.5f,1.5f, 1.5f, 0, 0},
               new float[] {1.5f, 1.5f, 1.5f, 0, 0},
               new float[] {0, 0, 0, 1, 0},
               new float[] {-1, -1, -1, 0, 1}
           });

        ImageAttributes attributes = new ImageAttributes();
        attributes.SetColorMatrix(colorMatrix);
        Rectangle abc= new Rectangle(-783, -383, bmpSS.Width, bmpSS.Height);
        gfxSS.DrawImage(bmpSS, abc, -783, -383, bmpSS.Width, bmpSS.Height, GraphicsUnit.Pixel, attributes);

        bmpSS.Save("ScreenshotGray.png", ImageFormat.Png);
    }

}

It's how it work http://take.ms/6tzvU[^]. How should i change area from rectangle to triangle?

解决方案

See http://www.flipcode.com/archives/Win32_Window_Skinning.shtml[^].

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