public String toString() {
		StringBuilder buff = new StringBuilder();
		for (int y = height-1; y>=0; y--) {
			buff.append('|');
			for (int x=0; x<width; x++) {
				if (getGrid(x,y)) buff.append('+');
				else buff.append(' ');
			}
			buff.append("|\n");
		}
		for (int x=0; x<width+2; x++) buff.append('-');
		return(buff.toString());
	}