[dec]

Hola,

¿Viste ya el ejemplo que se proporciona en la ayuda de Delphi para el método "CopyRect" de "TCanvas"?

Empezado por Ayuda de Delphi

The following code illustrates the differences between CopyRect and BrushCopy. The bitmap graphic ‘TARTAN.BMP’ is loaded into Bitmap and displayed on the Canvas of Form1. BrushCopy replaces the color black in the graphic with the brush of the canvas, while CopyRect leaves the colors intact.

Código Delphi [-]
 var
    Bitmap: TBitmap;
    MyRect, MyOther: TRect;
  begin
    MyRect := Rect(10,10,100,100);
    MyOther := Rect(10,111,100, 201);
    Bitmap := TBitmap.Create;
    Bitmap.LoadFromFile('c:\windows\tartan.bmp');
    Form1.Canvas.BrushCopy(MyRect, Bitmap, MyRect, clBlack);
    Form1.Canvas.CopyRect(MyOther,Bitmap.Canvas,MyRect);
    Bitmap.Free;
  end;