C＃矩形圖和截圖

Question

所以，讓我開始了通過展示你的代碼我現在有：

 private void Form1_MouseDown(object sender, MouseEventArgs e) 
    { 
     currentPos = startPos = e.Location; 
     drawing = true; 
    } 

    private void Form1_MouseMove(object sender, MouseEventArgs e) 
    { 
     currentPos = e.Location; 
     //Calculate X Coordinates 
     if (e.X < startPos.X) 
     { 
      CurrentTopLeft.X = e.X; 
     } 
     else 
     { 
      CurrentTopLeft.X = startPos.X; 
     } 

     //Calculate Y Coordinates 
     if (e.Y < startPos.Y) 
     { 
      CurrentTopLeft.Y = e.Y; 
     } 
     else 
     { 
      CurrentTopLeft.Y = startPos.Y; 
     } 

     if (drawing) 
      this.Invalidate(); 
    } 

    private void Form1_MouseUp(object sender, MouseEventArgs e) 
    { 
     if (drawing) 
     { 
      this.Hide(); 
      SaveScreen(); 
     } 
    } 

    private void Form1_Paint(object sender, PaintEventArgs e) 
    { 
     Color col = Color.FromArgb(75, 100, 100, 100); 
     SolidBrush b = new SolidBrush(col); 

     if (drawing) 
      e.Graphics.FillRectangle(b, getRectangle()); 
    } 

我SaveScreen功能：

 private void SaveScreen() 
     { 

     ScreenShot.CaptureImage(CurrentTopLeft, Point.Empty, getRectangle()); 

     } 

的CaptureImage功能：

 public static void CaptureImage(Point SourcePoint, Point DestinationPoint, Rectangle SelectionRectangle) 
    { 
     string FilePath = "temp.jpg"; 
     using (Bitmap bitmap = new Bitmap(SelectionRectangle.Width, SelectionRectangle.Height)) 
     { 
      using (Graphics g = Graphics.FromImage(bitmap)) 
      { 
       g.CopyFromScreen(SourcePoint, DestinationPoint, SelectionRectangle.Size); 
      } 
      bitmap.Save(FilePath, ImageFormat.Jpeg); 
     } 

     string Filename = String.Format("{0:yyyy-M-d-HH-mm-ss}", DateTime.Now) + ".jpg"; 
     string Server = ""; 

     System.Net.WebClient Client = new System.Net.WebClient(); 
     Client.Headers.Add("Content-Type", "image/jpeg"); 
     byte[] result = Client.UploadFile(Server + "upload.php?filename=" + Filename + "", "POST", FilePath); 
     string s = System.Text.Encoding.UTF8.GetString(result, 0, result.Length); 

     Program.mainForm.Notify(Server + Filename); 

     File.Delete(FilePath); 
    } 

這只是我在屏幕上繪製矩形的基本代碼。當矩形繪製時，它會拍攝一張圖像，效果很好。 問題是，矩形的繪製根本不平滑。我已經啓用了doublebuffering，幾乎嘗試了一切，但沒有運氣。

此外，我想抓住當前屏幕或凍結它，然後能夠在凍結屏幕上繪製，而不是在活動屏幕頂部繪製，如果您瞭解我的話。這將如何完成？

任何幫助非常感謝！

Answer 1

也許這帖子將幫助你： How to draw directly on the Windows desktop, C#?

Answer 2

你可以嘗試這樣的事：

int width = 
    Screen.PrimaryScreen.Bounds.Width, 
    height = Screen.PrimaryScreen.Bounds.Height; 

Bitmap screen = default(Bitmap); 

try 
{ 
    screen = new Bitmap 
    (
     width, 
     height, 
     Screen.PrimaryScreen.BitsPerPixel == 32 ? 
      PixelFormat.Format32bppRgb : 
       PixelFormat.Format16bppRgb565 
    ); 

    using (Graphics graphics = Graphics.FromImage(screen)) 
    { 
     graphics.SmoothingMode = SmoothingMode.AntiAlias; 

     graphics.CopyFromScreen 
     (
      new Point() { X = 0, Y = 0 }, 
      new Point() { X = 0, Y = 0 }, 
      new Size() { Width = width, Height = height }, 
      CopyPixelOperation.SourceCopy 
     ); 

     // Draw over the "capture" with Graphics object 
    } 
} 
finally 
{ 
    if (screen != null) 
    { 
     screen.Dispose(); 
    } 
}