chessprj/Knight.java at master · Atsuke/chessprj · GitHub

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package chessprj;

/**********************************************************************
 * Houses information about the Knight chess piece
 **********************************************************************/

public class Knight extends ChessPiece {

    /**********************************************************************
     * Constructor for knight piece
     *
     * @param player
     * @param model
     **********************************************************************/
    public Knight(Player player, ChessModel model) {
        super(player,model);
        setStrategicValue(4);
    }

    /**********************************************************************
     * @return piece type
     **********************************************************************/
    public String type() {
        return "Knight";
    }

    /**********************************************************************
     * set first move
     *
     * @param first
     **********************************************************************/
    public void setFirstMove(boolean first){
        firstMove = first;
    }//end setFirstMove

    /**********************************************************************
     * copies piece
     **********************************************************************/
    @Override
    public IChessPiece copy(){
        Knight copy = new Knight(player(), model);
        copy.setFirstMove(firstMove);
        return copy;
    }

    /**********************************************************************
     * checks if a proposed move is valid
     *
     * @param move
     * @param board
     * @return true if move valid, else false
     **********************************************************************/
    public boolean isValidMove(Move move, IChessPiece[][] board){
        boolean valid = false;

        // makes sure the move is within the confines of the board
        if(!isInBoard(move)) return false;

        //space is empty or occupied by opponent
        if(board[move.toRow][move.toColumn] == null || board[move.toRow][move.toColumn].player()!= player()){

            // up two spaces and left or right one
            if(move.toRow == move.fromRow-2)
                if(move.toColumn == move.fromColumn-1 || move.toColumn == move.fromColumn+1)
                    valid = true;

            //up one space and left or right two
            if(move.toRow == move.fromRow-1)
                if(move.toColumn == move.fromColumn-2 || move.toColumn == move.fromColumn+2)
                    valid = true;

            //down one space and left or right two
            if(move.toRow == move.fromRow+1)
                if(move.toColumn == move.fromColumn-2 || move.toColumn == move.fromColumn+2)
                    valid = true;

            //down two spaces and left or right one
            if(move.toRow == move.fromRow+2)
                if(move.toColumn == move.fromColumn-1 || move.toColumn == move.fromColumn+1)
                    valid = true;

        }//end check empty or opponent

        return valid;
    }
}