import java.util.ArrayList;
public class Queen extends Piece{
public Queen(int ix, int iy, int c, Board b) {
super(PieceCode.QUEEN, ix, iy, c, b);
}
// method implements abstract method in Piece class
public ArrayList<Move> availableMoves() {
return queen();
}
// method to return Vector of legal moves for a queen
private ArrayList<Move> queen() {
int x = getX();
int y = getY();
// otherwise create a new vector to store legal moves
ArrayList<Move> v = new ArrayList<Move>();
// set up m to refer to a Move object
Move m = null;
// legal moves to go from x,y to unoccupied places
int[][] avaiableMoves = {
{x+1,y}, {x+2,y}, {x+3,y}, {x+4,y}, {x+5,y}, {x+6,y}, {x+7,y}, //Positive x axis
{x-1,y}, {x-2,y}, {x-3,y}, {x-4,y}, {x-5,y}, {x-6,y}, {x-7,y}, //Negative x axis
{x,y+1}, {x,y+2}, {x,y+3}, {x,y+4}, {x,y+5}, {x,y+6}, {x,y+7}, //Positive y axis
{x,y-1}, {x,y-2}, {x,y-3}, {x,y-4}, {x,y-5}, {x,y-6}, {x,y-7}, //Negative y axis
{x+1,y+1}, {x+2,y+2}, {x+3,y+3}, {x+4,y+4}, {x+5,y+5}, {x+6,y+6}, {x+7,y+7}, //Positive right diagonal
{x-1,y-1}, {x-2,y-2}, {x-3,y-3}, {x-4,y-4}, {x-5,y-5}, {x-6,y-6}, {x-7,y-7}, //Negative left diagonal
{x-1,y+1}, {x-2,y+2}, {x-3,y+3}, {x-4,y+4}, {x-5,y+5}, {x-6,y+6}, {x-7,y+7}, //Positive left diagonal
{x+1,y-1}, {x+2,y-2}, {x+3,y-3}, {x+4,y-4}, {x+5,y-5}, {x+6,y-6}, {x+7,y-7}, //Negative right diagonal
};
//using the array of moves, find all the possible moves in the array that piece can from its position
for (int i = 0, j = avaiableMoves.length; i<j; i++){
int posX = avaiableMoves[i][0];
int posY = avaiableMoves[i][1];
//using for loop to check whether any of available moves in the list are occupied by other pieces or not when it's not out of range
if (!getBoard().outOfRange(posX,posY) && getBoard().occupied(posX,posY) && (getBoard().getPiece(posX,posY).getColour() !=this.getColour())) {
v.add(new Move(this, x,y,posX,posY,true));
}
//if occupied, then return false
else if (!getBoard().outOfRange(posX,posY) && !getBoard().occupied(posX,posY)) {
v.add(new Move(this, x,y,posX,posY,false));
}
}
if (v.isEmpty()) return null;
return v;
}
}
