In this assignment, you are to complete Lab 7 to create an almost complete game of chess. You should implement the standard pieces, alternate moves between two players, and capture pieces. You do not have to implement (unless you want to) the castling move, check and checkmate, pawn promotion, or the pawn en passant.

Rules of the assignment

• All variables should be private.
• All methods should have comments above the definition.
• All variables should have comments next to the variable.
• All classes should have comments above the class.
• All loops and complicated code should have comments.
• All comments should be in JavaDoc style.

Complete Lab 7

Adding opponents

We need to specify a direction for each piece. The direction corresponds to the side for a piece, or the direction the pawns may move. There are two possible values for the direction, up or down. As a result, you use either a boolean, and int, or an enum type to represent the direction.

Modify the ChessPiece class to add an instance variable that stores the piece's direction, add a direction to the constructor parameters, and add a method getDirection. You will need to make the appropriate changes to KnightPiece.

You should modify ChessBoard to keep track of the current direction. Change the actionPerformed method so that only a piece that matches the current direction can be selected and so that once the piece is moved, the current direction is changed.

Create the chess pieces

First you are to create the chess pieces. In the lab, you created the abstract ChessPiece as well as the KnightPiece. The other pieces are:

• KingPiece: A king should be labelled with "K". The king can move one space in any direction (including diagonal) as long as there is not a piece of the same color in the terminating space.

• RookPiece: A rook, labelled "R", can move any number of spaces either horzontally or vertically. There must be no piece on a square between the rook's starting and terminating spaces, and there must not be a piece of the same color on the rook's terminating space.

• BishopPiece: A bishop, labelled "B", can move any number of spaces in a straight diagonal. There must be no piece on a square between the bishop's starting and terminating spaces, and there must not be a piece of the same color on the bishop's terminating space.

• QueenPiece: A queen, labelled "Q", can move any number of spaces in a straight line, either horizontally, vertically, or diagonally. There must not be a piece on a square between the queen's starting and terminating spaces, and there must not be a piece of the same color on the queen's terminating space.

• PawnPiece: A pawn, labelled "P", has the following move rules:
  1. A pawn may move one space in the proper direction (either up or down) if there is no piece on the terminating square.
  2. If this is the first time the pawn is being moved, the pawn may move two spaces in the proper direction (either up or down) if there is no piece on either the space between the starting and terminating space or in the terminating space.
  3. The pawn may move one space diagonally in the proper direction (if the pawn's direction is up, the pawn may move up and to the left or up and to the right) if there is a piece with a different color in the terminating space.

Note: as mentioned in the lab, the different chess piece classes should not save any value that is saved in the ChessPiece class. Instead, if you need access to one of these values you should call the appropriate method from the parent class.

Play the game

You should create a main method that creates a ChessBoard and populates it with the appropriate pieces of two different colors, each color going in opposite directions. If you do not know the appropriate starting positions for the different pieces, you can do a quick internet search for "chess".