Direction.java

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package org.pepsoft.minecraft;

/**
 *
 * @author pepijn
 */
public enum Direction {
    NORTH, EAST, SOUTH, WEST;
    
    public Direction rotate(int steps) {
        int direction = ordinal();
        direction = (direction + steps) & 0x03;
        switch (direction) {
            case 0:
                return NORTH;
            case 1:
                return EAST;
            case 2:
                return SOUTH;
            case 3:
                return WEST;
            default:
                throw new InternalError();
        }
    }
    
    public Direction opposite() {
        switch (this) {
            case NORTH:
                return SOUTH;
            case EAST:
                return WEST;
            case SOUTH:
                return NORTH;
            case WEST:
                return EAST;
            default:
                throw new InternalError();
        }
    }

    public Direction left() {
        switch (this) {
            case NORTH:
                return WEST;
            case EAST:
                return NORTH;
            case SOUTH:
                return EAST;
            case WEST:
                return SOUTH;
            default:
                throw new InternalError();
        }
    }

    public Direction right() {
        switch (this) {
            case NORTH:
                return EAST;
            case EAST:
                return SOUTH;
            case SOUTH:
                return WEST;
            case WEST:
                return NORTH;
            default:
                throw new InternalError();
        }
    }
    
    public int getDx() {
        switch (this) {
            case NORTH:
                return 0;
            case EAST:
                return 1;
            case SOUTH:
                return 0;
            case WEST:
                return -1;
            default:
                throw new InternalError();
        }
    }

    public int getDy() {
        switch (this) {
            case NORTH:
                return -1;
            case EAST:
                return 0;
            case SOUTH:
                return 1;
            case WEST:
                return 0;
            default:
                throw new InternalError();
        }
    }
}