/**** * Classes ****/ var ActionButton = Container.expand(function (text, color, callback) { var self = Container.call(this); var bg = self.attachAsset(color === 'green' ? 'copyButtonBg' : 'resetButtonBg', { anchorX: 0.5, anchorY: 0.5 }); var buttonText = new Text2(text, { size: 28, fill: 0xFFFFFF }); buttonText.anchor.set(0.5, 0.5); buttonText.y = -10; self.addChild(buttonText); self.callback = callback; self.down = function (x, y, obj) { if (self.callback) { self.callback(); } }; return self; }); var ChessSquare = Container.expand(function (isLight, x, y) { var self = Container.call(this); var square = self.attachAsset(isLight ? 'chessSquareLight' : 'chessSquareDark', { anchorX: 0, anchorY: 0 }); self.squareX = x; self.squareY = y; self.isLight = isLight; self.piece = null; self.pieceText = null; self.setPiece = function (pieceSymbol) { if (self.pieceText) { self.removeChild(self.pieceText); } if (pieceSymbol) { self.piece = pieceSymbol; self.pieceText = new Text2(pieceSymbol, { size: 120, fill: 0x000000 }); self.pieceText.anchor.set(0.5, 0.5); self.pieceText.x = square.width / 2; self.pieceText.y = square.height / 2; self.addChild(self.pieceText); } else { self.piece = null; self.pieceText = null; } }; return self; }); var GenerateButton = Container.expand(function (callback) { var self = Container.call(this); var bg = self.attachAsset('buttonBg', { anchorX: 0.5, anchorY: 0.5 }); var text = new Text2('Generate New Position', { size: 36, fill: 0xFFFFFF }); text.anchor.set(0.5, 0.5); self.addChild(text); self.callback = callback; self.down = function (x, y, obj) { if (self.callback) { self.callback(); } }; return self; }); /**** * Initialize Game ****/ var game = new LK.Game({ backgroundColor: 0x2c3e50 }); /**** * Game Code ****/ var boardSquares = []; var currentPosition = ''; var positionText = null; // Chess piece symbols var pieceSymbols = { 'K': '♔', // King 'Q': '♕', // Queen 'R': '♖', // Rook 'B': '♗', // Bishop 'N': '♘' // Knight }; // Standard Chess960 pieces that need to be placed var piecesToPlace = ['R', 'N', 'B', 'Q', 'K', 'B', 'N', 'R']; function initializeBoard() { var boardSize = 1600; // 8 squares * 200px each var startX = (2048 - boardSize) / 2; var startY = 400; // Create 2 ranks: 8 and 2 (back rank and pawn rank) for (var rank = 0; rank < 2; rank++) { // Show ranks 8 and 2 for (var file = 0; file < 8; file++) { var isLight = (rank + file) % 2 === 0; var square = new ChessSquare(isLight, file, rank); square.x = startX + file * 200; square.y = startY + rank * 200; game.addChild(square); if (rank === 0) { // Only store rank 8 squares for piece placement boardSquares.push(square); } // Add pawns to rank 2 (white pawns) only if (rank === 1) { // Rank 2 - white pawns (one rank in front of pieces) square.setPiece('♙'); } } } } function generateChess960Position() { // Clear current pieces for (var i = 0; i < boardSquares.length; i++) { boardSquares[i].setPiece(null); } var position = new Array(8); var availableSquares = [0, 1, 2, 3, 4, 5, 6, 7]; // Step 1: Place bishops on opposite colored squares var lightSquares = [1, 3, 5, 7]; // Light squares var darkSquares = [0, 2, 4, 6]; // Dark squares // Place first bishop on light square var lightBishopPos = lightSquares[Math.floor(Math.random() * lightSquares.length)]; position[lightBishopPos] = 'B'; availableSquares.splice(availableSquares.indexOf(lightBishopPos), 1); // Place second bishop on dark square var darkBishopPos = darkSquares[Math.floor(Math.random() * darkSquares.length)]; position[darkBishopPos] = 'B'; availableSquares.splice(availableSquares.indexOf(darkBishopPos), 1); // Step 2: Place queen randomly in remaining squares var queenPos = availableSquares[Math.floor(Math.random() * availableSquares.length)]; position[queenPos] = 'Q'; availableSquares.splice(availableSquares.indexOf(queenPos), 1); // Step 3: Place knights randomly in remaining squares var knight1Pos = availableSquares[Math.floor(Math.random() * availableSquares.length)]; position[knight1Pos] = 'N'; availableSquares.splice(availableSquares.indexOf(knight1Pos), 1); var knight2Pos = availableSquares[Math.floor(Math.random() * availableSquares.length)]; position[knight2Pos] = 'N'; availableSquares.splice(availableSquares.indexOf(knight2Pos), 1); // Step 4: Place king and rooks (king must be between rooks) // Sort remaining squares to ensure proper rook-king-rook placement availableSquares.sort(function (a, b) { return a - b; }); position[availableSquares[0]] = 'R'; // First rook position[availableSquares[1]] = 'K'; // King position[availableSquares[2]] = 'R'; // Second rook // Update board display for (var i = 0; i < 8; i++) { boardSquares[i].setPiece(pieceSymbols[position[i]]); } // Generate position notation currentPosition = position.join(''); updatePositionText(); } function calculatePositionNumber(position) { // Calculate Chess960 position number (0-959) var n = 0; var pieces = position.split(''); // Find king position var kingPos = pieces.indexOf('K'); var leftRook = pieces.indexOf('R'); var rightRook = pieces.lastIndexOf('R'); // N1: King position relative to rooks (0-3) var rookPairs = [[0, 1], [0, 2], [0, 3], [0, 4], [0, 5], [0, 6], [0, 7], [1, 2], [1, 3], [1, 4], [1, 5], [1, 6], [1, 7], [2, 3], [2, 4], [2, 5], [2, 6], [2, 7], [3, 4], [3, 5], [3, 6], [3, 7], [4, 5], [4, 6], [4, 7], [5, 6], [5, 7], [6, 7]]; var rookPairIndex = -1; for (var i = 0; i < rookPairs.length; i++) { if (rookPairs[i][0] === leftRook && rookPairs[i][1] === rightRook) { rookPairIndex = i; break; } } var n1 = 0; for (var pos = leftRook + 1; pos < rightRook; pos++) { if (pieces[pos] === 'K') break; n1++; } // N2: Queen position (0-5) var queenPos = pieces.indexOf('Q'); var emptySquares = []; for (var i = 0; i < 8; i++) { if (pieces[i] !== 'R' && pieces[i] !== 'K') { emptySquares.push(i); } } var n2 = emptySquares.indexOf(queenPos); // N3: Light bishop position (0-3) var lightSquares = [1, 3, 5, 7]; var lightBishopPos = -1; for (var i = 0; i < lightSquares.length; i++) { if (pieces[lightSquares[i]] === 'B') { lightBishopPos = i; break; } } var n3 = lightBishopPos; // N4: Dark bishop position (0-3) var darkSquares = [0, 2, 4, 6]; var darkBishopPos = -1; for (var i = 0; i < darkSquares.length; i++) { if (pieces[darkSquares[i]] === 'B') { darkBishopPos = i; break; } } var n4 = darkBishopPos; // N5: Knight positions (0-9) var knights = []; for (var i = 0; i < 8; i++) { if (pieces[i] === 'N') { knights.push(i); } } var availableForKnights = []; for (var i = 0; i < 8; i++) { if (pieces[i] !== 'R' && pieces[i] !== 'K' && pieces[i] !== 'Q' && pieces[i] !== 'B') { availableForKnights.push(i); } } var n5 = 0; if (availableForKnights.length >= 2) { var first = availableForKnights.indexOf(knights[0]); var second = availableForKnights.indexOf(knights[1]); if (first < second) { n5 = first * (availableForKnights.length - 1) + second - 1; } else { n5 = second * (availableForKnights.length - 1) + first; } } return n4 + 4 * n3 + 16 * n5 + 96 * n2 + 576 * n1; } function updatePositionText() { if (positionText) { positionText.setText('Position: ' + currentPosition); } if (numericalText) { var posNumber = calculatePositionNumber(currentPosition); numericalText.setText('Position #' + posNumber); } } function copyPosition() { // Flash effect to show copy action LK.effects.flashScreen(0x27ae60, 300); } function resetToStandard() { var standardPosition = ['R', 'N', 'B', 'Q', 'K', 'B', 'N', 'R']; for (var i = 0; i < 8; i++) { boardSquares[i].setPiece(pieceSymbols[standardPosition[i]]); } currentPosition = standardPosition.join(''); updatePositionText(); } // Initialize board initializeBoard(); // Create title var titleText = new Text2('Chess960 Position Generator', { size: 60, fill: 0xFFFFFF }); titleText.anchor.set(0.5, 0); titleText.x = 2048 / 2; titleText.y = 100; game.addChild(titleText); // Create subtitle for ranks var rankLabel = new Text2('Ranks 8 (Black) and 2 (White)', { size: 32, fill: 0xBDC3C7 }); rankLabel.anchor.set(0.5, 1); rankLabel.x = 2048 / 2; rankLabel.y = 380; game.addChild(rankLabel); // Create position display text positionText = new Text2('Position: RNBQKBNR', { size: 48, fill: 0xFFFFFF }); positionText.anchor.set(0.5, 0); positionText.x = 2048 / 2; positionText.y = 1000; game.addChild(positionText); // Create numerical position display var numericalText = new Text2('Position #518', { size: 40, fill: 0xE8C547 }); numericalText.anchor.set(0.5, 0); numericalText.x = 2048 / 2; numericalText.y = 1060; game.addChild(numericalText); // Create generate button var generateBtn = new GenerateButton(generateChess960Position); generateBtn.x = 2048 / 2; generateBtn.y = 1200; game.addChild(generateBtn); // Create copy button var copyBtn = new ActionButton('Copy Position', 'green', copyPosition); copyBtn.x = 2048 / 2 - 200; copyBtn.y = 1400; game.addChild(copyBtn); // Create reset button var resetBtn = new ActionButton('Standard Setup', 'red', resetToStandard); resetBtn.x = 2048 / 2 + 200; resetBtn.y = 1380; game.addChild(resetBtn); // Create rules title var rulesText = new Text2('Rules', { size: 36, fill: 0xFFFFFF }); rulesText.anchor.set(0.5, 0); rulesText.x = 2048 / 2; rulesText.y = 1420; game.addChild(rulesText); // Create instructions var instructionText = new Text2('Bishops on opposite colors, King between Rooks', { size: 28, fill: 0x95A5A6 }); instructionText.anchor.set(0.5, 0); instructionText.x = 2048 / 2; instructionText.y = 1460; game.addChild(instructionText); // Set initial standard position currentPosition = 'RNBQKBNR'; resetToStandard();