void Paint(Draw &w) {
  Size sz = GetSize();
  ImageBuffer ib(sz);
  BufferPainter sw(ib, MODE_ANTIALIASED);
  
  sw.DrawRect(sz, Black());
  
  int pos_y = 0;
  for(int stroke = 1; true; stroke += 1) {
    double center_of_line = stroke / 2.0;
    sw.Move( 0, pos_y + center_of_line).Line(sz.cx, pos_y + center_of_line).Stroke(stroke, Red());
    pos_y += (stroke * 2);
    if(pos_y >= sz.cy) {
     break;
    }
  }
}

void DrawLine(BufferPainter* bp, int x1, int y1, int x2, int y2, double stroke, Color color) {
  double center_of_line_x = 0;
  double center_of_line_y = 0;
  if(x1 == x2) {
    center_of_line_x = stroke / 2.0;
  }
  if(y1 == y2) {
    center_of_line_y = stroke / 2.0;
  }
  bp->Move(x1 + center_of_line_x, y1 + center_of_line_y).Line(x2 + center_of_line_x, y2 + center_of_line_y).Stroke(stroke, color);
}

	void Paint(Draw& w) override
	{
		Size sz = GetSize();
		w.DrawRect(sz, Black());
		ImageBuffer canvas(sz);
		
		for(int y = 0; y < sz.cy; y++) {
			for(int x = 0; x < sz.cx; x++) {
				if((y % 16 == 0) || (x % 16 == 0))
					canvas[y][x] = White();
			}
		}
		w.DrawImage(0, 0, canvas);
		
	}