public GameState getMove(GameState state, int x, int y) {
GameState retVal = null;
XYLocation loc = new XYLocation(x, y);
List moves = getMoves(state);
List newMoves = (List) moves.clone();
if (moves.contains(loc)) {
int index = newMoves.indexOf(loc);
newMoves.remove(index);
retVal = new GameState();
retVal.put("moves", newMoves);
TicTacToeBoard newBoard = getBoard(state).cloneBoard();
if (getPlayerToMove(state) == "X") {
newBoard.markX(x, y);
retVal.put("player", "O");
} else {
newBoard.markO(x, y);
retVal.put("player", "X");
}
retVal.put("board", newBoard);
retVal.put("utility", new int(computeUtility(newBoard,
getPlayerToMove(getState()))));
retVal.put("level", new int(getLevel(state) + 1));
// presentState = retVal;
}
return retVal;
}
public void removeQueenFrom(XYLocation l)
{
if (squares[l.getXCoOrdinate()][l.getYCoOrdinate()] == 1)
{
squares[l.getXCoOrdinate()][l.getYCoOrdinate()] = 0;
}
}
public void moveObjectToAbsoluteLocation(EnvironmentObject eo,
XYLocation loc)
{
// Ensure the object is not already at a location
envState.moveObjectToAbsoluteLocation(eo, loc);
// Ensure is added to the environment
addEnvironmentObject(eo);
}
public override bool Equals(Object o)
{
if (null == o || !(o is XYLocation))
{
return(base.Equals(o));
}
XYLocation anotherLoc = (XYLocation)o;
return((anotherLoc.getXCoOrdinate() == xCoOrdinate) && (anotherLoc
.getYCoOrdinate() == yCoOrdinate));
}
public void moveObject(EnvironmentObject eo, XYLocation.Direction direction)
{
XYLocation presentLocation = envState.getCurrentLocationFor(eo);
if (null != presentLocation)
{
XYLocation locationToMoveTo = presentLocation.locationAt(direction);
if (!(isBlocked(locationToMoveTo)))
{
moveObjectToAbsoluteLocation(eo, locationToMoveTo);
}
}
}
public TicTacToe() {
List<XYLocation> moves = new List<XYLocation>();
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
XYLocation loc = new XYLocation(i, j);
moves.Add(loc);
}
}
initialState.put("moves", moves);
initialState.put("player", "X");
initialState.put("utility", new int(0));
initialState.put("board", new TicTacToeBoard());
initialState.put("level", new int(0));
presentState = initialState;
}
public HashSet<Action> actions(Object state)
{
NQueensBoard board = (NQueensBoard)state;
HashSet<Action> actions = new LinkedHashSet<Action>();
int numQueens = board.getNumberOfQueensOnBoard();
int boardSize = board.getSize();
for (int i = 0; i < boardSize; i++)
{
XYLocation newLocation = new XYLocation(numQueens, i);
if (!(board.isSquareUnderAttack(newLocation)))
{
actions.Add(new QueenAction(QueenAction.PLACE_QUEEN,
newLocation));
}
}
return actions;
}
public int evaluateManhattanDistanceOf(int i, XYLocation loc)
{
int retVal = -1;
int xpos = loc.getXCoOrdinate();
int ypos = loc.getYCoOrdinate();
switch (i)
{
case 1:
retVal = Math.abs(xpos - 0) + Math.abs(ypos - 1);
break;
case 2:
retVal = Math.abs(xpos - 0) + Math.abs(ypos - 2);
break;
case 3:
retVal = Math.abs(xpos - 1) + Math.abs(ypos - 0);
break;
case 4:
retVal = Math.abs(xpos - 1) + Math.abs(ypos - 1);
break;
case 5:
retVal = Math.abs(xpos - 1) + Math.abs(ypos - 2);
break;
case 6:
retVal = Math.abs(xpos - 2) + Math.abs(ypos - 0);
break;
case 7:
retVal = Math.abs(xpos - 2) + Math.abs(ypos - 1);
break;
case 8:
retVal = Math.abs(xpos - 2) + Math.abs(ypos - 2);
break;
}
return retVal;
}
/**
* Creates a queen action. Supported values of type are {@link #PLACE_QUEEN}
* , {@link #REMOVE_QUEEN}, or {@link #MOVE_QUEEN}.
*/
public QueenAction(String type, XYLocation loc)
{
super(type);
setAttribute(ATTRIBUTE_QUEEN_LOC, loc);
}
public HashSet<EnvironmentObject> getObjectsAt(XYLocation loc)
{
HashSet<EnvironmentObject> objectsAt = objsAtLocation.get(loc);
if (null == objectsAt)
{
// Always ensure an empty Set is returned
objectsAt = new LinkedHashSet<EnvironmentObject>();
objsAtLocation.put(loc, objectsAt);
}
return objectsAt;
}
public void testXYLocationAtributeSettingOnConstruction() {
XYLocation loc = new XYLocation(3, 4);
Assert.AreEqual(3, loc.getXCoOrdinate());
Assert.AreEqual(4, loc.getYCoOrdinate());
}
public void testEquality() {
XYLocation loc1 = new XYLocation(3, 4);
XYLocation loc2 = new XYLocation(3, 4);
Assert.AreEqual(loc1, loc2);
}
public bool isBlocked(XYLocation loc)
{
foreach (EnvironmentObject eo in envState.getObjectsAt(loc))
{
if (eo is Wall)
{
return true;
}
}
return false;
}
public void makePerimeter()
{
for (int i = 0; i < envState.width; i++)
{
XYLocation loc = new XYLocation(i, 0);
XYLocation loc2 = new XYLocation(i, envState.height - 1);
envState.moveObjectToAbsoluteLocation(new Wall(), loc);
envState.moveObjectToAbsoluteLocation(new Wall(), loc2);
}
for (int i = 0; i < envState.height; i++)
{
XYLocation loc = new XYLocation(0, i);
XYLocation loc2 = new XYLocation(envState.width - 1, i);
envState.moveObjectToAbsoluteLocation(new Wall(), loc);
envState.moveObjectToAbsoluteLocation(new Wall(), loc2);
}
}
public int getNumberOfAttacksOn(XYLocation l)
{
int x = l.getXCoOrdinate();
int y = l.getYCoOrdinate();
return numberOfHorizontalAttacksOn(x, y)
+ numberOfVerticalAttacksOn(x, y)
+ numberOfDiagonalAttacksOn(x, y);
}
public HashSet<EnvironmentObject> getObjectsAt(XYLocation loc)
{
return envState.getObjectsAt(loc);
}
public void addQueenAt(XYLocation l)
{
if (!(queenExistsAt(l)))
squares[l.getXCoOrdinate()][l.getYCoOrdinate()] = 1;
}
public bool isSquareUnderAttack(XYLocation l)
{
int x = l.getXCoOrdinate();
int y = l.getYCoOrdinate();
return (isSquareHorizontallyAttacked(x, y)
|| isSquareVerticallyAttacked(x, y) || isSquareDiagonallyAttacked(
x, y));
}
public List<XYLocation> getPositions() {
List<XYLocation> retVal = new List<XYLocation>();
for (int i = 0; i < 9; i++) {
int absPos = getPositionOf(i);
XYLocation loc = new XYLocation(getXCoord(absPos),
getYCoord(absPos));
retVal.Add(loc);
}
return retVal;
}
/**
* Moves the queen in the specified column (x-value of <code>l</code>) to
* the specified row (y-value of <code>l</code>). The action assumes a
* complete-state formulation of the n-queens problem.
*
* @param l
*/
public void moveQueenTo(XYLocation l)
{
for (int i = 0; i < size; i++)
squares[l.getXCoOrdinate()][i] = 0;
squares[l.getXCoOrdinate()][l.getYCoOrdinate()] = 1;
}
public void moveObjectToAbsoluteLocation(EnvironmentObject eo,
XYLocation loc)
{
// Ensure is not already at another location
foreach (Set<EnvironmentObject> eos in objsAtLocation.values())
{
if (eos.remove(eo))
{
break; // Should only every be at 1 location
}
}
// Add it to the location specified
getObjectsAt(loc).Add(eo);
}
public bool queenExistsAt(XYLocation l)
{
return (queenExistsAt(l.getXCoOrdinate(), l.getYCoOrdinate()));
}
public void moveQueen(XYLocation from, XYLocation to)
{
if ((queenExistsAt(from)) && (!(queenExistsAt(to))))
{
removeQueenFrom(from);
addQueenAt(to);
}
}
//
// PRIVATE METHODS
//
private bool withinRadius(int radius, XYLocation agentLocation,
XYLocation objectLocation)
{
int xdifference = agentLocation.getXCoOrdinate()
- objectLocation.getXCoOrdinate();
int ydifference = agentLocation.getYCoOrdinate()
- objectLocation.getYCoOrdinate();
return Math.sqrt((xdifference * xdifference)
+ (ydifference * ydifference)) <= radius;
}
public void addObjectToLocation(EnvironmentObject eo, XYLocation loc)
{
moveObjectToAbsoluteLocation(eo, loc);
}
public int getValueAt(XYLocation loc) {
return getValueAt(loc.getXCoOrdinate(), loc.getYCoOrdinate());
}
public HashSet<Action> actions(Object state)
{
HashSet<Action> actions = new LinkedHashSet<Action>();
NQueensBoard board = (NQueensBoard)state;
for (int i = 0; i < board.getSize(); i++)
for (int j = 0; j < board.getSize(); j++)
{
XYLocation loc = new XYLocation(i, j);
if (!board.queenExistsAt(loc))
actions
.Add(new QueenAction(QueenAction.MOVE_QUEEN,
loc));
}
return actions;
}