/** * @param options Parameters * @param options.elem DOM element for component * @param options.width Width of game field * @param options.height Height of game field */ function Tetris(options) { var elem = options.elem; var width = (+options.width < 10) ? 10 : ~~(+options.width); var height = (+options.height < 20) ? 21 : ~~(+options.height + 1); var controlTimeoutHandle; var fallingTimeoutHandle; var predictionField; var scoreField; var gameField; var tetraminoForms = [ [ ['i', 'i', 'i', 'i'] ], [ ['j', '.', '.'], ['j', 'j', 'j'] ], [ ['.', '.', 'l'], ['l', 'l', 'l'] ], [ ['o', 'o'], ['o', 'o'] ], [ ['.', 's', 's'], ['s', 's', '.'] ], [ ['.', 't', '.'], ['t', 't', 't'] ], [ ['z', 'z', '.'], ['.', 'z', 'z'] ] ]; var fieldArray = []; var currentTetramino; var nextTetramino; var coordsToMove = [0, 0]; var fallSpeed = 1000; function generateComponent() { function generateUI() { var divUi = document.createElement('div'); predictionField = document.createElement('table'); for (var i = 0; i < 4; i++) { var tr = document.createElement('tr'); for (var j = 0; j < 4; j++) { var td = document.createElement('td'); tr.appendChild(td); } predictionField.appendChild(tr); } scoreField = document.createElement('div'); scoreField.classList.add('score-field'); scoreField.innerHTML = 0; divUi.appendChild(predictionField); divUi.appendChild(scoreField); divUi.classList.add('ui'); elem.appendChild(divUi); } function generateGlassUI() { var divGameField = document.createElement('div'); gameField = document.createElement('table'); gameField.classList.add('glass') for (var i = 0; i < height; i++) { var tr = document.createElement('tr'); for (var j = 0; j < width; j++) { var td = document.createElement('td'); tr.appendChild(td); } gameField.appendChild(tr); } divGameField.appendChild(gameField); divGameField.classList.add('game'); elem.appendChild(divGameField); } function generateFieldArray() { for (var i = 0; i < height; i++) { fieldArray.push([]); for (var j = 0; j < width; j++) { fieldArray[i].push('.'); } } } generateUI(); generateGlassUI(); generateFieldArray(); } // ------------- Tetramino Class ------------------ function Tetramino(type) { this.form = tetraminoForms[type].slice(0); this.coords = [~~(width / 2) - ~~(tetraminoForms[type][0].length / 2), 0]; this.prevCoords; } Tetramino.prototype.rotate = function() { var temp = new Array(this.form[0].length); for (var i = 0; i < temp.length; i++) { temp[i] = new Array(this.form.length); for (var j = 0; j < temp[i].length; j++) { temp[i][j] = this.form[temp[i].length - j - 1][i]; } } for (var i = 0; i < temp.length; i++) { for (var j = 0; j < temp[i].length; j++) { if (fieldArray[this.coords[1] + i] !== undefined && fieldArray[this.coords[1] + i][this.coords[0] + j] !== undefined && fieldArray[this.coords[1] + i][this.coords[0] + j] === '.') { continue; } else { return; } } } this.form = temp; }; Tetramino.prototype.control = function(coords) { if (coords[0] === 0 && coords[1] === -1) { this.rotate(); return; } if (this.coords[0] + coords[0] >= 0 && this.coords[0] + coords[0] + this.form[0].length <= fieldArray[0].length) { if (checkSideCoords(this.coords[0] + coords[0], coords[0])) { this.coords[0] += coords[0]; } } if (this.coords[1] + coords[1] >= 0 && this.coords[1] + coords[1] + this.form.length <= fieldArray.length) { this.coords[1] += coords[1]; } }; // ----------- Tetramino Class End --------------- function drawField() { for (var i = 0; i < fieldArray.length; i++) { for (var j = 0; j < fieldArray[i].length; j++) { gameField.rows[i].cells[j].className = ''; gameField.rows[i].cells[j].classList.add(fieldArray[i][j]); } } } function drawNextTetramino() { for (var i = 0; i < 4; i++) { for (var j = 0; j < 4; j++) { predictionField.rows[i].cells[j].className = ''; } } for (var i = 0; i < nextTetramino.form.length; i++) { for (var j = 0; j < nextTetramino.form[i].length; j++) { predictionField.rows[i].cells[j].classList.add(nextTetramino.form[i][j]); } } } function controlTetramino(event) { var code = event.keyCode; if (code === 37) coordsToMove = [-1, 0]; if (code === 38) coordsToMove = [0, -1]; if (code === 39) coordsToMove = [1, 0]; if (code === 40) coordsToMove = [0, 1]; } function runTetris() { currentTetramino = new Tetramino(Math.floor(Math.random() * (6 + 1))); nextTetramino = new Tetramino(Math.floor(Math.random() * (6 + 1))); drawNextTetramino(); moveTetramino(); fallTetramino(); } function moveTetramino() { controlTimeoutHandle = setTimeout(function() { if (currentTetramino.prevCoords) { for (var i = 0; i < currentTetramino.form.length; i++) { for (var j = 0; j < currentTetramino.form[i].length; j++) { if (currentTetramino.form[i][j] == '.') continue; fieldArray[i + currentTetramino.prevCoords[1]][j + currentTetramino.prevCoords[0]] = '.'; } } } currentTetramino.control(coordsToMove); for (var i = 0; i < currentTetramino.form.length; i++) { for (var j = 0; j < currentTetramino.form[i].length; j++) { if (currentTetramino.form[i][j] == '.') continue; fieldArray[i + currentTetramino.coords[1]][j + currentTetramino.coords[0]] = currentTetramino.form[i][j]; } } currentTetramino.prevCoords = currentTetramino.coords.slice(0); coordsToMove = [0, 0]; drawField(); checkBlocksUnderTetramino(); moveTetramino(); }, 0); } function fallTetramino() { fallingTimeoutHandle = setTimeout(function() { coordsToMove = [0, 1]; fallTetramino(); }, fallSpeed); } function checkBlocksUnderTetramino() { if (currentTetramino.coords[1] + currentTetramino.form.length === fieldArray.length) { changeTetramino(); return; } for (var i = currentTetramino.form.length - 1; i >= 0; i--) { for (var j = currentTetramino.form[i].length - 1; j >= 0; j--) { if (currentTetramino.form[i][j] === '.') continue; if (fieldArray[currentTetramino.coords[1] + i + 1][currentTetramino.coords[0] + j] !== '.' && fieldArray[currentTetramino.coords[1] + i][currentTetramino.coords[0] + j] !== '.' && (currentTetramino.form[i + 1] === undefined || currentTetramino.form[i + 1][j] === '.')) { changeTetramino(); return; } } } } function checkSideCoords(coords, side) { if (coords === 0 && coords === fieldArray[0].length) { return false; } var side = (side === -1) ? -1 : currentTetramino.form[0].length; for (var i = 0; i < currentTetramino.form.length; i++) { if (fieldArray[currentTetramino.coords[1] + i][currentTetramino.coords[0] + side] !== '.' && currentTetramino.form[i][(side === -1) ? 0 : currentTetramino.form[0].length - 1] !== '.') { return false; } } return true; } function changeTetramino() { checkAndRemoveFilledRow(); isGameOver(); currentTetramino = nextTetramino; nextTetramino = new Tetramino(Math.floor(Math.random() * (6 + 1))); drawNextTetramino(); scoreField.innerHTML++; } function checkAndRemoveFilledRow() { for (var i = 0; i < fieldArray.length; i++) { var toClean = true; for (var j = 0; j < fieldArray[i].length; j++) { if (fieldArray[i][j] === '.') { toClean = false; break; } } if (toClean) { fieldArray.splice(i, 1); fieldArray.unshift([]); for (var j = 0; j < width; j++) { fieldArray[0].push('.'); } scoreField.innerHTML = +scoreField.innerHTML + width; fallSpeed = (fallSpeed > 300) ? fallSpeed - 50 : fallSpeed; } } } function isGameOver() { if (currentTetramino.coords[1] <= 1) { alert('game over'); resetGame(); } } function resetGame() { for (var i = 0; i < fieldArray.length; i++) { for (var j = 0; j < fieldArray[i].length; j++) { fieldArray[i][j] = '.'; } } scoreField.innerHTML = 0; fallSpeed = 1000; } generateComponent(); drawField(); document.body.addEventListener('keydown', controlTetramino, false); runTetris(); } var tetris = new Tetris({ elem: document.getElementById('tetris'), width: 10, height: 20 });

作品「俄罗斯方块小游戏」预览