@Override
public void findControlledStacks(String boardSpace) {
Tile boardTile = new Tile();
boardTile = boardTile.stringToTile(boardSpace);
if (boardTile.getColor() == 'W') {
int newScore = getScore() + boardTile.getPipsLeftEnd() + boardTile.getPipsRightEnd();
setScore(newScore);
}
}
/**
* Checks to see whether the computer has any moves available with the chosen tile from its hand.
*
* @param cpuSelectTile A Tile object that the computer player chose from its hand.
* @param gameBoard A Board object that holds all the tiles currently on the board.
* @return True if there is at least one possible move, false otherwise.
*/
public boolean canCPUMakeMove(Tile cpuSelectTile, Board gameBoard) {
boolean makeMove = false;
Tile boardTile = new Tile();
for (int space = 0; space < gameBoard.getAllBoardSpaces().size(); space++) {
if (isValidMove(cpuSelectTile, boardTile.stringToTile(gameBoard.getBoardStacks().get(space)))
== true) {
makeMove = true;
break;
}
}
return makeMove;
}
/**
* Creates an ArrayList of integers that represent the best possible moves on the board for a
* given tile.
*
* @param cpuSelectedTile A Tile object that the computer player chose from its hand.
* @param gameBoard A Board object that holds all the tiles currently on the board.
* @return bestMove An ArrayList of integers whose values represent the desirability of a move at
* each location on the board. The higher the number the more desirable the move.
*/
public ArrayList<Integer> calculateBestMoveVector(Tile cpuSelectedTile, Board gameBoard) {
ArrayList<Integer> bestMove = new ArrayList<Integer>();
for (int space = 0; space < gameBoard.getBoardStacks().size(); space++) {
Tile boardTile = new Tile();
// Get boardTile from the game board.
String boardTileString = gameBoard.getBoardStacks().get(space);
// Convert the tile from string to Tile.
boardTile = boardTile.stringToTile(boardTileString);
int moveScore = 0;
// Positive score computer tile on human tile.
if (cpuSelectedTile.getColor() == 'W' && boardTile.getColor() == 'B') {
moveScore =
(cpuSelectedTile.getPipsLeftEnd() + cpuSelectedTile.getPipsRightEnd())
+ (boardTile.getPipsLeftEnd() + boardTile.getPipsRightEnd());
}
// Negative score computer tile on own computer tile.
else if (cpuSelectedTile.getColor() == 'W' && boardTile.getColor() == 'W') {
moveScore =
(cpuSelectedTile.getPipsLeftEnd() + cpuSelectedTile.getPipsRightEnd())
- (boardTile.getPipsLeftEnd() + boardTile.getPipsRightEnd())
- 10;
}
// This is for help function, positive score human tile on computer tile.
else if (cpuSelectedTile.getColor() == 'B' && boardTile.getColor() == 'W') {
moveScore =
(cpuSelectedTile.getPipsLeftEnd() + cpuSelectedTile.getPipsRightEnd())
+ (boardTile.getPipsLeftEnd() + boardTile.getPipsRightEnd());
}
// Also for help function, negative score human tile on own human tile.
else if (cpuSelectedTile.getColor() == 'B' && boardTile.getColor() == 'B') {
moveScore =
(cpuSelectedTile.getPipsLeftEnd() + cpuSelectedTile.getPipsRightEnd())
- (boardTile.getPipsLeftEnd() + boardTile.getPipsRightEnd())
- 10;
}
bestMove.add(moveScore);
}
return bestMove;
}
/**
* Performs the action of the computer player choosing a tile, choosing a location, and then
* executing the move if possible. Also used for help function to determine best move for human
* player but a move will not be executed.
*
* @param gameBoard A Board object that holds all the tiles currently on the board.
* @param help Boolean value used to determine if this is being used for the computer's move or
* help functionality. It is set to true if used for the help functionality, false for the
* computer's turn.
* @return True if a move was executed. A return value of false means no moves were possible and
* the computer must pass or a help recommendation will be to pass.
* @throws Exception if an invalid tile or location is specified for placeTile function.
*/
public boolean playTile(Board gameBoard, boolean help) throws Exception {
int handLocation = 0;
boolean canMove = false;
while (handLocation < getHand().size()) {
// Select tile from hand.
Tile cpuTile = new Tile(selectTileToPlay(handLocation));
// See if any moves are possible with that tile.
boolean possibleMove = canCPUMakeMove(cpuTile, gameBoard);
if (possibleMove == true) {
ArrayList<Integer> bestMove =
new ArrayList<Integer>(calculateBestMoveVector(cpuTile, gameBoard));
boolean foundLocation;
do {
// Select location to play tile.
String cpuLocation = selectLocationToPlay(gameBoard, bestMove);
// See if selected location would yield a valid move.
Tile boardTile = new Tile();
if (isValidMove(cpuTile, boardTile.stringToTile(gameBoard.getBoardTile(cpuLocation)))
== true) {
// Record the tile played, tile replaced, and location for display purposes.
setTilePlayed(cpuTile);
setTileReplaced(boardTile.stringToTile(gameBoard.getBoardTile(cpuLocation)));
setLocationReplaced(cpuLocation);
// Flag to skip this step if this is for the user's help function
if (help == false) {
// To prevent the computer from placing a non-double tile on its own tile if it has a
// double tile it can play.
if (!(gameBoard.getBoardTile(cpuLocation).startsWith("W")
&& handLocation != (getHand().size() - 1))) {
placeTile(gameBoard, cpuLocation, cpuTile);
foundLocation = true;
} else {
foundLocation = false;
break;
}
} else {
// Same as above to prevent from placing non-double tile on its own tile if double
// tile can be played, but for help mode.
if (!(gameBoard.getBoardTile(cpuLocation).startsWith("B")
&& handLocation != (getHand().size() - 1))) {
foundLocation = true;
} else {
foundLocation = false;
break;
}
}
} else {
// Selected location and tile combination was not a valid move.
foundLocation = false;
}
} while (foundLocation == false);
// A location was found and a move was made.
if (foundLocation == true) {
canMove = true;
break;
}
// Chooses the next tile in the hand.
else {
handLocation++;
}
}
// The selected tile was unplayable.
else {
handLocation++;
canMove = false;
}
}
return canMove;
}