Add wxScreenDC and Graphics.CopyFromScreen

[generalloki]

https://docs.wxwidgets.org/3.2/classwx_screen_d_c.html

CopyFromScreen is present in standard .Net8.0 https://learn.microsoft.com/fr-fr/dotnet/api/system.drawing.graphics.copyfromscreen?view=dotnet-plat-ext-8.0

[generalloki]

Added Graphics.FromScreen. It creates canvas which allows to draw on screen.

[neoxeo]

@generalloki

I have compiled 0.9.516 and Graphics.FromScreen not present/available .

[generalloki]

It is strange. There is such method: public static Graphics FromScreen() and also a demo in \AlternetUI\Source\Samples\ControlsSample\InternalSamples\NinePatchDrawing\ (button 'Draw on Screen')

[generalloki]

BTW Ubuntu doesn't allow to draw on screen. It worked only on Windows.

[neoxeo]

Ok, thanks for your answer.

I have tried to use like this :

  private void TakeScreenShot()
  {
      Bitmap bitmap = new Bitmap(Display.Primary.Bounds.Width, Display.Primary.Bounds.Height);
      Graphics graphics = Graphics.FromImage(bitmap);

      graphics.FromScreen(0, 0, 0, 0, bitmap.Size);

      bitmap.Save("screenshot.png", BitmapType.Png);
      graphics.Dispose();
}

[generalloki]

Graphics.FromScreen is static method that create Graphics, so currently it is not like in WinForms. There will be method GetAsBitmapI in Graphics which gets the bitmap. But currently there are some problems with this even on Windows and I am not sure it will work on Linux

[neoxeo]

@generalloki

I found these links if it can be usefull to find a solution : https://forums.wxwidgets.org/viewtopic.php?t=43803 https://forums.wxwidgets.org/viewtopic.php?f=23&t=49318&p=212830 https://forums.wxwidgets.org/viewtopic.php?f=23&t=42979&p=174659 https://forums.wxwidgets.org/viewtopic.php?f=1&t=5016&p=22887

[generalloki]

One of these links worked. I added Image.FromScreen (static function). It works like this:

               var bitmap = Image.FromScreen();
                if (bitmap is not null)
                {
                    bitmap?.Rescale((800, 600));
                    picturePopup.MainControl.Image = bitmap;
                    picturePopup.ShowPopup(button2);
                }
                else
                    Application.LogError("Screen picture is null");

I beleive we don't need Graphics.CopyFromScreen for now, it is enough to have Image.FromScreen, maybe will add CopyFromScreen later.

Current problem is that this works under Windows but don't work under Ubuntu, so still need to be improved

[neoxeo]

Test Ok, perfect !

Thanks a lot