Android Open Source - slider Frame Scrambler

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License

The source code is released under:

Apache License

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Java Source Code

package de.devisnik.sliding;
//www  . j a v a  2 s.  c  o m
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
 
public class FrameScrambler {

  private final static IMove[] MOVES = new IMove[] { MoveFactory.LEFT,
      MoveFactory.RIGHT, MoveFactory.DOWN, MoveFactory.UP };

  private final IFrame itsFrame;

  private final IRandom itsRandom;

  public FrameScrambler(IFrame frame, IRandom random) {
    this.itsFrame = frame;
    this.itsRandom = random;
  }

  public IMove[] scramble(int numberOfMoves) {
    return scrambleGame(numberOfMoves);
  }

  public IMove[] scramble() {
    Point size = itsFrame.getSize();
    int pieces = size.x * size.y;
    return scramble(pieces * 10);
  }

  private IMove[] scrambleGame(int numberOfMoves) {
    final IMove[] moves = new IMove[numberOfMoves];
    IMove lastInverse = null;
    for (int index = 0; index < moves.length; index++) {
      IMove randomMove = moveRandomAvoiding(lastInverse);
      lastInverse = MoveFactory.getInverse(randomMove);
      moves[index] = randomMove;
    }
    return moves;
  }

  private IMove moveRandomAvoiding(IMove avoid) {
    List<IMove> validMoves = determinePossibleMoves();
    validMoves.remove(avoid);
    return executeRandomMoveFrom(validMoves);
  }

  private IMove executeRandomMoveFrom(List<IMove> moves) {
    IMove move = moves.get(itsRandom.nextInt(moves.size()));
    if (!itsFrame.execute(move))
      throw new IllegalStateException("move not executable!");
    return move;
  }

  public List<IMove> determinePossibleMoves() {
    ArrayList<IMove> moves = new ArrayList<IMove>();
    moves.addAll(Arrays.asList(MOVES));
    Point holePosition = itsFrame.getHole().getPosition();
    if (holePosition.x == 0)
      moves.remove(MoveFactory.LEFT);
    Point frameDimension = itsFrame.getSize();
    if (holePosition.x == frameDimension.x - 1)
      moves.remove(MoveFactory.RIGHT);
    if (holePosition.y == 0)
      moves.remove(MoveFactory.UP);
    if (holePosition.y == frameDimension.y - 1)
      moves.remove(MoveFactory.DOWN);
    return moves;
  }

  public static void main(String[] args) {
    new FrameScrambler(FrameFactory.create(4, 4), new IRandom() {
      Random random = new Random();

      public int nextInt(int border) {
        return random.nextInt(border);
      }
    }).scramble();
  }
}

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