/* Copyright 1996 Rujith de Silva.
   This code is in the public domain. */
package NET.industry.pento;
import NET.industry.util.*;

public class Piece extends Object
{
    private int init[][] = new int[5][2];
    private int dir = 0;
    private boolean swap = false;
    protected int current[][] = new int[5][2];

    private int xmul[][] =
    { { 1, 0 },
      { 0, -1 }, 
      { -1, 0 }, 
      { 0, 1 }
    };

    private int ymul[][] =
    { { 0, 1 },
      { 1, 0 },
      { 0, -1 },
      { -1, 0 }
    };
    
    public Piece (int init[][])
    {
        for (int i = 0; i < 5; ++i)
        {
            for (int j = 0; j < 2; ++j)
            {
                this.init[i][j] = init[i][j];
                current[i][j] = init[i][j];
            }
        }
    }

    public int direction ()
    {
        return dir;
    }
    
    public void setDirection (int i)
    {
        i %= 4;
        if (dir != i)
        {
            dir = i;
            update ();
        }
    }

    public boolean getSwap ()
    {
        return swap;
    }

    public void setSwap (boolean sw)
    {
        if (swap != sw)
        {
            swap = sw;
            update ();
        }
    }

    private void update ()
    {
        int xm1 = xmul[dir][0];
        int xm2 = xmul[dir][1];
        int ym1 = ymul[dir][0];
        int ym2 = ymul[dir][1];
        for (int i = 0; i < 5; ++i)
        {
            int i0 = init[i][0];
            int i1 = init[i][1];
            if (swap) i1 = - i1;
            current[i][0] = i0 * xm1 + i1 * xm2;
            current[i][1] = i0 * ym1 + i1 * ym2;
        }
    }
}