enum BrushTileType{
	ROCK,
	WALL,
	SKY,
	ROCK_BACK,
	WALL_BACK;

	public BrushTileType next() {
		if (ordinal() == values().length-1){
			return values()[0];
		}
		return values()[ordinal() + 1];
	}

	public BrushTileType previous() {
		if (ordinal() == 0){
			return values()[values().length-1];
		}
		return values()[ordinal() - 1];
	}
}