    001    package net.minecraftforge.common;
    002
    003    public enum ForgeDirection
    004    {
    005        /** -Y */
    006        DOWN(0, -1, 0),
    007
    008        /** +Y */
    009        UP(0, 1, 0),
    010
    011        /** -Z */
    012        NORTH(0, 0, -1),
    013
    014        /** +Z */
    015        SOUTH(0, 0, 1),
    016
    017        /** -X */
    018        WEST(-1, 0, 0),
    019
    020        /** +X */
    021        EAST(1, 0, 0),
    022
    023        /**
    024         * Used only by getOrientation, for invalid inputs
    025         */
    026        UNKNOWN(0, 0, 0);
    027
    028        public final int offsetX;
    029        public final int offsetY;
    030        public final int offsetZ;
    031        public final int flag;
    032        public static final ForgeDirection[] VALID_DIRECTIONS = {DOWN, UP, NORTH, SOUTH, WEST, EAST};
    033        public static final int[] OPPOSITES = {1, 0, 3, 2, 5, 4, 6};
    034        // Left hand rule rotation matrix for all possible axes of rotation
    035        public static final int[][] ROTATION_MATRIX = {
    036            {0, 1, 4, 5, 3, 2, 6},
    037            {0, 1, 5, 4, 2, 3, 6},
    038            {5, 4, 2, 3, 0, 1, 6},
    039            {4, 5, 2, 3, 1, 0, 6},
    040            {2, 3, 1, 0, 4, 5, 6},
    041            {3, 2, 0, 1, 4, 5, 6},
    042            {0, 1, 2, 3, 4, 5, 6},
    043        };
    044
    045        private ForgeDirection(int x, int y, int z)
    046        {
    047            offsetX = x;
    048            offsetY = y;
    049            offsetZ = z;
    050            flag = 1 << ordinal();
    051        }
    052
    053        public static ForgeDirection getOrientation(int id)
    054        {
    055            if (id >= 0 && id < VALID_DIRECTIONS.length)
    056            {
    057                return VALID_DIRECTIONS[id];
    058            }
    059            return UNKNOWN;
    060        }
    061
    062        public ForgeDirection getOpposite()
    063        {
    064            return getOrientation(OPPOSITES[ordinal()]);
    065        }
    066
    067        public ForgeDirection getRotation(ForgeDirection axis)
    068        {
    069            return getOrientation(ROTATION_MATRIX[axis.ordinal()][ordinal()]);
    070        }
    071    }