feat: highlight legal moves on chess board interaction
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@@ -212,6 +212,16 @@ class GameEngine(
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notifyObservers(InvalidMoveEvent(currentBoard, currentHistory, currentTurn, "Error completing promotion."))
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}
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/** Load an arbitrary board position, clearing all history and undo/redo state. */
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def loadPosition(board: Board, history: GameHistory, turn: Color): Unit = synchronized {
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currentBoard = board
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currentHistory = history
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currentTurn = turn
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pendingPromotion = None
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invoker.clear()
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notifyObservers(BoardResetEvent(currentBoard, currentHistory, currentTurn))
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}
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/** Reset the board to initial position. */
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def reset(): Unit = synchronized {
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currentBoard = Board.initial
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@@ -10,9 +10,11 @@ import scalafx.scene.shape.Rectangle
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import scalafx.scene.text.{Font, Text}
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import scalafx.stage.Stage
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import de.nowchess.api.board.{Board, Color, Piece, PieceType, Square, File, Rank}
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import de.nowchess.api.game.{CastlingRights, GameState, GameStatus}
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import de.nowchess.api.move.PromotionPiece
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import de.nowchess.chess.engine.GameEngine
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import de.nowchess.chess.logic.GameRules
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import de.nowchess.chess.logic.{CastlingRightsCalculator, EnPassantCalculator, GameHistory, GameRules, withCastle}
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import de.nowchess.chess.notation.{FenExporter, FenParser, PgnExporter, PgnParser}
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/** ScalaFX chess board view that displays the game state.
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* Uses chess sprites and color palette.
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@@ -57,25 +59,57 @@ class ChessBoardView(val stage: Stage, private val engine: GameEngine) extends B
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children = boardGrid
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}
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bottom = new HBox {
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bottom = new VBox {
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padding = Insets(10)
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spacing = 10
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spacing = 8
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alignment = Pos.Center
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children = Seq(
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new Button("Undo") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => if engine.canUndo then engine.undo()
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style = "-fx-background-radius: 8; -fx-background-color: #B9DAD1;"
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new HBox {
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spacing = 10
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alignment = Pos.Center
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children = Seq(
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new Button("Undo") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => if engine.canUndo then engine.undo()
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style = "-fx-background-radius: 8; -fx-background-color: #B9DAD1;"
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},
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new Button("Redo") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => if engine.canRedo then engine.redo()
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style = "-fx-background-radius: 8; -fx-background-color: #B9C2DA;"
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},
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new Button("Reset") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => engine.reset()
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style = "-fx-background-radius: 8; -fx-background-color: #E1EAA9;"
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}
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)
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},
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new Button("Redo") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => if engine.canRedo then engine.redo()
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style = "-fx-background-radius: 8; -fx-background-color: #B9C2DA;"
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},
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new Button("Reset") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => engine.reset()
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style = "-fx-background-radius: 8; -fx-background-color: #E1EAA9;"
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new HBox {
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spacing = 10
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alignment = Pos.Center
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children = Seq(
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new Button("FEN Export") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => doFenExport()
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style = "-fx-background-radius: 8; -fx-background-color: #DAC4B9;"
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},
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new Button("FEN Import") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => doFenImport()
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style = "-fx-background-radius: 8; -fx-background-color: #DAD4B9;"
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},
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new Button("PGN Export") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => doPgnExport()
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style = "-fx-background-radius: 8; -fx-background-color: #C4DAB9;"
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},
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new Button("PGN Import") {
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font = Font.font("Comic Sans MS", 12)
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onAction = _ => doPgnImport()
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style = "-fx-background-radius: 8; -fx-background-color: #B9DAC4;"
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}
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)
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}
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)
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}
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@@ -221,3 +255,86 @@ class ChessBoardView(val stage: Stage, private val engine: GameEngine) extends B
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case Some("Bishop") => engine.completePromotion(PromotionPiece.Bishop)
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case Some("Knight") => engine.completePromotion(PromotionPiece.Knight)
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case _ => engine.completePromotion(PromotionPiece.Queen) // Default
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private def doFenExport(): Unit =
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val state = GameState(
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piecePlacement = FenExporter.boardToFen(currentBoard),
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activeColor = currentTurn,
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castlingWhite = CastlingRightsCalculator.deriveCastlingRights(engine.history, Color.White),
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castlingBlack = CastlingRightsCalculator.deriveCastlingRights(engine.history, Color.Black),
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enPassantTarget = EnPassantCalculator.enPassantTarget(currentBoard, engine.history),
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halfMoveClock = 0,
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fullMoveNumber = engine.history.moves.size / 2 + 1,
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status = GameStatus.InProgress
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)
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showCopyDialog("FEN Export", FenExporter.gameStateToFen(state))
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private def doFenImport(): Unit =
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showInputDialog("FEN Import", rows = 1).foreach { fen =>
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FenParser.parseFen(fen) match
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case None => showMessage("Invalid FEN")
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case Some(state) =>
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FenParser.parseBoard(state.piecePlacement) match
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case None => showMessage("Invalid FEN board")
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case Some(board) => engine.loadPosition(board, GameHistory.empty, state.activeColor)
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}
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private def doPgnExport(): Unit =
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showCopyDialog("PGN Export", PgnExporter.exportGame(Map.empty, engine.history))
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private def doPgnImport(): Unit =
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showInputDialog("PGN Import", rows = 6).foreach { pgn =>
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PgnParser.parsePgn(pgn) match
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case None => showMessage("Invalid PGN")
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case Some(pgnGame) =>
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val (finalBoard, finalHistory) = pgnGame.moves.foldLeft((Board.initial, GameHistory.empty)):
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case ((board, history), move) =>
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val color = if history.moves.size % 2 == 0 then Color.White else Color.Black
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val newBoard = move.castleSide match
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case Some(side) => board.withCastle(color, side)
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case None =>
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val (b, _) = board.withMove(move.from, move.to)
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move.promotionPiece match
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case Some(pp) =>
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val pt = pp match
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case PromotionPiece.Queen => PieceType.Queen
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case PromotionPiece.Rook => PieceType.Rook
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case PromotionPiece.Bishop => PieceType.Bishop
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case PromotionPiece.Knight => PieceType.Knight
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b.updated(move.to, Piece(color, pt))
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case None => b
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(newBoard, history.addMove(move))
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val finalTurn = if finalHistory.moves.size % 2 == 0 then Color.White else Color.Black
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engine.loadPosition(finalBoard, finalHistory, finalTurn)
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}
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private def showCopyDialog(title: String, content: String): Unit =
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val area = new javafx.scene.control.TextArea(content)
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area.setEditable(false)
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area.setWrapText(true)
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area.setPrefRowCount(4)
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val alert = new javafx.scene.control.Alert(javafx.scene.control.Alert.AlertType.INFORMATION)
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alert.setTitle(title)
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alert.setHeaderText(null)
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alert.getDialogPane.setContent(area)
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alert.getDialogPane.setPrefWidth(500)
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alert.initOwner(stage.delegate)
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alert.showAndWait()
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private def showInputDialog(title: String, rows: Int = 2): Option[String] =
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val area = new javafx.scene.control.TextArea()
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area.setWrapText(true)
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area.setPrefRowCount(rows)
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val dialog = new javafx.scene.control.Dialog[String]()
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dialog.setTitle(title)
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dialog.getDialogPane.setContent(area)
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dialog.getDialogPane.getButtonTypes.addAll(
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javafx.scene.control.ButtonType.OK,
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javafx.scene.control.ButtonType.CANCEL
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)
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dialog.setResultConverter { bt =>
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if bt == javafx.scene.control.ButtonType.OK then area.getText else null
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}
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dialog.initOwner(stage.delegate)
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val result = dialog.showAndWait()
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if result.isPresent && result.get != null && result.get.nonEmpty then Some(result.get) else None
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@@ -19,7 +19,7 @@ class ChessGUIApp extends JFXApplication:
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stage.title = "Chess"
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stage.width = 700
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stage.height = 800
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stage.height = 1000
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stage.resizable = false
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val boardView = new ChessBoardView(stage, engine)
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