com.barrybecker4.puzzle.hiq.model.PegBoardSymmetries Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bb4-hiq Show documentation

bb4-puzzles build java code.

There is a newer version: 1.6.2

/** Copyright by Barry G. Becker, 2000-2011. Licensed under MIT License: http://www.opensource.org/licenses/MIT  */
package com.barrybecker4.puzzle.hiq.model;

/**
 * Static PegBoard symmetries.
 * @author Barry Becker
 */
class PegBoardSymmetries {

    /**
     *  The number of symmetries the board has.
     *  Each odd and even pair are mirror images of a 90 degree rotation.
     */
    static final int SYMMETRIES = 8;

    /**
     * The 8 fold symmetry of the board.
     */
    private static final byte[][] BOARD_SYMMETRY = {
        { /* placeholder for 0 index. i.e. 0-31 */},
        {2, 1, 0, 5, 4, 3, 12, 11, 10, 9, 8, 7, 6, 19, 18, 17, 16, 15, 14, 13, 26, 25, 24, 23, 22, 21, 20, 29, 28, 27, 32, 31, 30},
        {12, 19, 26, 11, 18, 25, 2, 5, 10, 17, 24, 29, 32, 1, 4, 9, 16, 23, 28, 31, 0, 3, 8, 15, 22, 27, 30, 7, 14, 21, 6, 13, 20},
        {26, 19, 12, 25, 18, 11, 32, 29, 24, 17, 10, 5, 2, 31, 28, 23, 16, 9, 4, 1, 30, 27, 22, 15, 8, 3, 0, 21, 14, 7, 20, 13, 6},
        {32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0},
        {30, 31, 32, 27, 28, 29, 20, 21, 22, 23, 24, 25, 26, 13, 14, 15, 16, 17, 18, 19, 6, 7, 8, 9, 10, 11, 12, 3, 4, 5, 0, 1, 2},
        {20, 13, 6, 21, 14, 7, 30, 27, 22, 15, 8, 3, 0, 31, 28, 23, 16, 9, 4, 1, 32, 29, 24, 17, 10, 5, 2, 25, 18, 11, 26, 19, 12},
        {6, 13, 20, 7, 14, 21, 0, 3, 8, 15, 22, 27, 30, 1, 4, 9, 16, 23, 28, 31, 2, 5, 10, 17, 24, 29, 32, 11, 18, 25, 12, 19, 26}
    };


    static byte[] getSymmetry(int symmIndex) {
        return BOARD_SYMMETRY[symmIndex];
    }
}