public boolean isInView(int marginx,int marginy) {
		if (!getTileBBox(temp_bbox_copy)) {
			temp_bbox_copy.x = (int)x;
			temp_bbox_copy.y = (int)y;
			temp_bbox_copy.width = 0;
			temp_bbox_copy.height = 0;
		}
		if (temp_bbox_copy.x + temp_bbox_copy.width  < viewxofs-marginx)
			return false;
		if (temp_bbox_copy.y + temp_bbox_copy.height < viewyofs-marginy)
			return false;
		if (temp_bbox_copy.x > viewxofs+viewwidth + marginx)
			return false;
		if (temp_bbox_copy.y > viewyofs+viewheight + marginy)
			return false;
		return true;
	}