更详细的代码
procedure TForm1.Button1Click(Sender: TObject);
begin
LImage.Width := 400;
LImage.Height := 400;
BitBlt(LImage.Canvas.Handle, 0, 0, 200, 200, Image1.Canvas.Handle , 0, 0, SRCCOPY);
BitBlt(LImage.Canvas.Handle, 0, 200, 200, 200, Image2.Canvas.Handle , 0, 0, SRCCOPY);
BitBlt(LImage.Canvas.Handle, 200, 0, 200, 200, Image3.Canvas.Handle , 0, 0, SRCCOPY);
BitBlt(LImage.Canvas.Handle, 200, 200, 200, 200, Image4.Canvas.Handle , 0, 0, SRCCOPY);
end;