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Implemented checkmate and stalemate detection

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This commit is contained in:
Kai S. K. Engelbart 2019-07-06 17:37:55 +02:00
parent 612fb5fc9a
commit 3edcae660b
3 changed files with 14 additions and 12 deletions
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21
src/dev/kske/chess/Board.java
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@ -55,14 +55,14 @@ public class Board {
Piece capturePiece = move(move); Piece capturePiece = move(move);
// Revert move if it caused a check for its team // Revert move if it caused a check for its team
if (checkCheck(piece.getColor()) != GameEventType.NONE) { if (checkCheck(piece.getColor())) {
revert(move, capturePiece); revert(move, capturePiece);
return false; return false;
} }
// Detect check on the opposite team // Detect check and stalemate on the opposite team
Color oppositeColor = piece.getColor().opposite(); Color oppositeColor = piece.getColor().opposite();
GameEventType eventType = checkCheck(oppositeColor); GameEventType eventType = getGameEventType(oppositeColor);
if (eventType != GameEventType.NONE) notifyListeners(new GameEvent(this, eventType, oppositeColor)); if (eventType != GameEventType.NONE) notifyListeners(new GameEvent(this, eventType, oppositeColor));
return true; return true;
@ -121,18 +121,21 @@ public class Board {
return get(pos).getMoves(pos); return get(pos).getMoves(pos);
} }
public GameEventType checkCheck(Color color) { public boolean checkCheck(Color color) {
for (int i = 0; i < 8; i++) for (int i = 0; i < 8; i++)
for (int j = 0; j < 8; j++) { for (int j = 0; j < 8; j++) {
Position pos = new Position(i, j); Position pos = new Position(i, j);
if (get(pos) != null && get(pos).getColor() != color if (get(pos) != null && get(pos).getColor() != color
&& get(pos).isValidMove(new Move(pos, kingPos.get(color)))) && get(pos).isValidMove(new Move(pos, kingPos.get(color))))
return GameEventType.CHECK; return true;
// TOOD: Checkmate detection
// return getMoves(kingPos.get(color)).isEmpty() ? GameEventType.CHECKMATE :
// GameEventType.CHECK;
} }
return GameEventType.NONE; return false;
}
public GameEventType getGameEventType(Color color) {
return checkCheck(color)
? getMoves(kingPos.get(color)).isEmpty() ? GameEventType.CHECKMATE : GameEventType.CHECK
: getMoves(color).isEmpty() ? GameEventType.STALEMATE : GameEventType.NONE;
} }
public void registerGameEventListener(GameEventListener listener) { public void registerGameEventListener(GameEventListener listener) {

2
src/dev/kske/chess/event/GameEvent.java
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@ -33,6 +33,6 @@ public class GameEvent extends EventObject {
public Color getColor() { return color; } public Color getColor() { return color; }
public static enum GameEventType { public static enum GameEventType {
CHECK, CHECKMATE, STALEMENT, NONE; CHECK, CHECKMATE, STALEMATE, NONE;
} }
} }

3
src/dev/kske/chess/piece/Piece.java
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@ -6,7 +6,6 @@ import java.util.List;
import dev.kske.chess.Board; import dev.kske.chess.Board;
import dev.kske.chess.Move; import dev.kske.chess.Move;
import dev.kske.chess.Position; import dev.kske.chess.Position;
import dev.kske.chess.event.GameEvent.GameEventType;
/** /**
* Project: <strong>Chess</strong><br> * Project: <strong>Chess</strong><br>
@ -29,7 +28,7 @@ public abstract class Piece {
for (Iterator<Move> iterator = moves.iterator(); iterator.hasNext();) { for (Iterator<Move> iterator = moves.iterator(); iterator.hasNext();) {
Move move = iterator.next(); Move move = iterator.next();
Piece capturePiece = board.move(move); Piece capturePiece = board.move(move);
if (board.checkCheck(getColor()) != GameEventType.NONE) if (board.checkCheck(getColor()))
iterator.remove(); iterator.remove();
board.revert(move, capturePiece); board.revert(move, capturePiece);
} }