public int playPieceAt(int p, int x, int y)
{
// Plays the valid piece P at (x,y) on the board. Returns the Success piece on regular success
// (with the board updated), the Failure piece if the move is invalid, or, if a person has
// begun moving, it returns a pure Person piece to indicate which person is moving.
// If you get a failure piece, you can get an error message using getLastErrorMessage.
Coordinates c = new Coordinates(x, y);
// check if there are no moves left
if (this._movingPerson && this.personMovesLeft <= 0)
{
return(this.setFailure("You have no moves left for your person."));
}
if (!this.piecesLeftThisTurn())
{
return(this.setFailure("You have no pieces left for this turn."));
}
// check for valid coordinates, retrieve the current piece on the board.
if (!this.currentBoard.isValidCoords(c))
{
return(this.setFailure("Internal Error: invalid coordinates"));
}
int currentPiece = this.currentBoard.getCell(c);
// check game rules and place piece based on which kind it is.
if (Pieces.isPerson(p) && this._movingPerson)
{
// Playing a single step in moving a person. First, see if there is a path to move the person.
// (The situation of having no moves left was already handled up top.)
int sourcePiece = this.currentBoard.getCell(this.personCoordinates);
int thisPersonPiece = Pieces.getPersonPieceFrom(sourcePiece);
int thisPersonNumber = Pieces.personNumber(thisPersonPiece);
int goalPiece = this.currentBoard.createGoalPiece(thisPersonNumber, 0, c);
bool reachedGoal = (goalPiece == currentPiece);
if (Pieces.personNumber(currentPiece) > 0)
{
return(this.setFailure("There can be only one person in a square at a time."));
}
if (!Pieces.piecesConnect(this.currentBoard.getCell(this.personCoordinates), currentPiece, this.personCoordinates.x(), this.personCoordinates.y(), x, y))
{
return(this.setFailure("There is no path for the person to get to that square. Make sure to move your person only one square at a time."));
}
//-- it appears that we now have a valid move.
//-- move the person
sourcePiece = Pieces.setPersonNumber(sourcePiece, 0);
currentPiece = Pieces.setPersonNumber(currentPiece, thisPersonNumber);
this.currentBoard.setCell(this.personCoordinates, sourcePiece);
this.personMovesLeft--;
this.personCoordinates = c;
//-- check for coins
if (Pieces.gold(currentPiece) || Pieces.silver(currentPiece))
{
if (Pieces.gold(currentPiece))
{
this.incrementScore(this.pointsForGold());
}
if (Pieces.silver(currentPiece))
{
this.incrementScore(this.pointsForSilver());
}
currentPiece = Pieces.setCoins(currentPiece, false, false);
this.currentBoard.setCell(c, currentPiece);
}
//-- check for reaching goal
if (reachedGoal)
{
int thisZeroBasedPersonNumber = thisPersonNumber - 1;
this.incrementScore(this.personScores[thisZeroBasedPersonNumber]); // DEBUG: line where Nancy's game crashed 9/1 8:20pm: probably due to the zero-based/one-based thing, probably she got her purple person to the goal which caused the crash.
this.personScores[thisZeroBasedPersonNumber]--;
if (this.personScores[thisZeroBasedPersonNumber] < 0)
{
this.personScores[thisZeroBasedPersonNumber] = 0;
}
//-- check: have we won by finding all the goals?
if (this.currentBoard.isWinningBoard())
{
this.determineWinners();
}
}
//-- now our piece is ready to store and we can return.
this.currentBoard.setCell(c, currentPiece);
return(Pieces.createSuccessPiece());
}
else if (Pieces.isPerson(p) || Pieces.isHouse(p))
{
// Playing a person piece or house piece when you're not moving a person.
if (!this.currentBoard.isOnEdge(c))
{
return(this.setFailure("Person and house pieces can only be placed on the edges.")); // person piece has to be placed on edge
}
if (this.currentBoard.isOnCorner(c))
{
return(this.setFailure("You can't place person and house pieces on the corners."));
}
if (this.currentBoard.distanceToPartner(p, c) < 5)
{
return(this.setFailure("The person piece and the house piece of each color have to be at least 5 spaces apart.")); // person piece can't be too close to house piece
}
if (!Pieces.isGreenGrassPiece(currentPiece))
{
return(this.setFailure("Person and house pieces can only be placed on green grass.")); // have to put house or person on green grass.
}
// combine the pieces and store the result. Also add a path for the person or house.
int newPiece = Pieces.combinePieces(currentPiece, p);
if (Pieces.isFailurePiece(newPiece))
{
return(this.setFailure("There was an unexpected problem."));
}
newPiece = this.currentBoard.setGoalDirections(newPiece, c);
this.currentBoard.setCell(c, newPiece);
this.setCurrentPiecePlayed();
return(Pieces.createSuccessPiece());
}
else
{
// Playing a regular piece. If you play it against an existing piece with a person on it,
// it starts person-moving mode. If you play it on a blank square, it places the piece.
// Other moves are invalid.
if (Pieces.personNumber(currentPiece) > 0)
{
// Begin person moving mode
this._movingPerson = true;
this.personCoordinates = c;
this.personMovesLeft = Pieces.numberMoves(p);
this.setCurrentPiecePlayed();
return(Pieces.createSuccessPiece());
}
else if (this.currentBoard.isOnEdge(c)) //-- note: you CAN be on an edge if you're moving a person, see above.
{
return(this.setFailure("You can't play a path piece on the edge of the board."));
}
else if (Pieces.isBlank(currentPiece))
{
// Placing tile in blank space
this.currentBoard.setCell(c, p);
this.setCurrentPiecePlayed();
return(Pieces.createSuccessPiece());
}
else
{
return(this.setFailure("You can't move there."));
}
}
// Shouldn't get here, and indeed, the compiler says you can't get here.
}