public void revertMove() {
// pops a move from the stack and reverses it
try {
Move move = this.popMoveFromHistory(); // pop a move off the stack
if (move.getPosition() == -1) {
// move is pass
} else {
this.positions[move.getPosition()] = 0; // set move position to empty
int stackSize = move.getFlipStackSize(); // how many flips are there?
for (int i = 0; i < stackSize; i++) { // loop through the stack
int flipPosition = move.popFlip();
// System.out.println(flipPosition);
this.setPosition(flipPosition); // pop a flip and un-flip it
}
}
// Debugging stuff
popCount++;
// System.out.println("pop");
// this.printBoard();
} catch (NullPointerException e) {
System.out.println("(C you tried to pop an empty move stack )");
}
}
public void applyMove(int color, Move move) {
// applies move based on fields of supplied move and pushes it to the stack
if (move.getPosition() == -1) {
// move is pass
} else {
this.positions[move.getPosition()] = color;
Stack<Integer> flipStack = move.getFlips();
int amountOfFlips = flipStack.size();
for (int i = 0; i < amountOfFlips; i++) {
this.positions[flipStack.pop()] = color;
}
}
this.pushMoveToHistory(move);
this.clearLegalMovesList();
// debugging stuff
pushCount++;
// System.out.println("push");
// this.printBoard();
}
public int makeComputerMove(long timeRemaining) {
// othellonator makes a move
Move myMove = null;
moveCount++;
System.out.println("(C moveCount = " + moveCount + ")");
if (this.generateLegalMoves(myColor)) { // evaluate board, do stuff if legal moves found
String listSize = Integer.toString(getLegalMovesListSize());
System.out.println("(C Number of moves:" + listSize + " )");
if (moveCount < 10) {
myMove = Search.alphaBetaSearch(this, 6, myColor);
} else if (moveCount >= 10 && moveCount <= 20) {
myMove = Search.alphaBetaSearch(this, 8, myColor);
} else {
myMove = Search.alphaBetaSearch(this, 10, myColor);
}
this.applyMove(myColor, myMove); // apply the move returned by the search
return myMove.getPosition(); // return the position of the move so it can be output
} else return -1; // signal that no move was found
}
public boolean evaluateOpponentMove(int color, int position) {
// runs generateMoveForPosition() to generate flips and push the move on to the list
// then applies the move at the front of the list
boolean legal = false;
Move move = null;
this.generateLegalMoves(myColor * -1); // evaluate legal moves for opponent
for (int i = 0; i < this.legalMovesList.size(); i++) { // check move against legalMovesList
Move tester = this.getLegalMove(i);
// if opponent's move found in legalMoveList, it is legal
if (tester.getPosition() == position) {
legal = true;
move = tester;
}
}
// if the move is legal, apply it and return true. otherwise return false.
if (legal) {
applyMove(color, move);
return true;
} else return false;
}
