// hexagonal coordinate class
// understands adjacency
// coordinates are only by reference to one grid

import java.lang.Object;
import HexGrid;

public class HexCoord extends Object {
  public int x, y;
  HexGrid myHexGrid;

  public HexCoord(HexGrid g, int newx, int newy) {
    myHexGrid = g;
    x = newx; 
    y = newy;
  }

  // how is this different than clone?
  public HexCoord(HexCoord hc) {
    myHexGrid = hc.myHexGrid;
    x = hc.x;
    y = hc.y;
  }
  
  public void move(int newx, int newy) {
    x = newx;
    y = newy;
  }

  public void moveInDirection(int direction) {
    if (x % 2 == 0)
      switch(direction) {
	case 0:      y--; break;
	case 1: x++; y--; break;
	case 2: x++;      break;
	case 3:      y++; break;
	case 4: x--;      break;
	case 5: x--; y--; break;
      }
    else
      switch(direction) {
	case 0:      y--; break;
	case 1: x++;      break;
	case 2: x++; y++; break;
	case 3:      y++; break;
	case 4: x--; y++; break;
	case 5: x--;      break;
      }
  }	

  public void moveAwayFromDirection(int direction) {
    moveInDirection((direction + 3) % 6);
  }

  // restrict coord to grid, doing wraparound
  public void renormalize() {
    x %= myHexGrid.width;
    if (x < 0)
      x += myHexGrid.width;
    y %= myHexGrid.height;
    if (y < 0)
      y += myHexGrid.height;
  }
    
  public String toString() {
    return new String("HexCoord: (" + x + "," + y + ")");
  }
}