@Override
	public String toString() {
		StringBuilder sb = new StringBuilder("map(");
		sb.append(widthMap);
		sb.append(", ");
		sb.append(heightMap);
		sb.append(")\n");
		for(int j=0; j<this.heightMap; ++j) {
			for(int i=0; i<this.widthMap; ++i) {
				if(this.map[i][j]==-1) {
					sb.append(" ");
				}
				else {
					sb.append("  ");
				}
				sb.append(this.map[i][j]);
			}
			sb.append("\n");
		}
		return sb.toString();
	}