| <!DOCTYPE html> |
| <html lang="zh"> |
| <head> |
| <meta charset="UTF-8"> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| <title>贪吃蛇</title> |
| <link href="https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap" rel="stylesheet"> |
| <script src="https://cdn.tailwindcss.com"></script> |
| <style> |
| body { |
| font-family: 'Press Start 2P', cursive; |
| display: flex; |
| justify-content: center; |
| align-items: center; |
| min-height: 100vh; |
| background-color: #1a1a1a; |
| color: #ffffff; |
| flex-direction: column; |
| padding: 20px; |
| box-sizing: border-box; |
| } |
| #gameCanvas { |
| background-color: #000000; |
| border: 5px solid #33ff33; |
| display: block; |
| max-width: 100%; |
| height: auto; |
| aspect-ratio: 1 / 1; |
| image-rendering: pixelated; |
| box-shadow: 0 0 20px #33ff33; |
| margin-bottom: 20px; |
| } |
| .game-controls { |
| text-align: center; |
| margin-top: 15px; |
| } |
| .game-button { |
| font-family: 'Press Start 2P', cursive; |
| background-color: #33ff33; |
| color: #000000; |
| border: 2px solid #000000; |
| padding: 10px 20px; |
| margin: 5px; |
| cursor: pointer; |
| text-transform: uppercase; |
| transition: background-color 0.3s, transform 0.1s; |
| box-shadow: 3px 3px 0 #118811; |
| } |
| .game-button:hover { |
| background-color: #11cc11; |
| } |
| .game-button:active { |
| transform: translate(2px, 2px); |
| box-shadow: 1px 1px 0 #118811; |
| } |
| #messageBox { |
| position: absolute; |
| top: 50%; |
| left: 50%; |
| transform: translate(-50%, -50%); |
| background-color: rgba(0, 0, 0, 0.8); |
| color: #ff3333; |
| padding: 30px; |
| border: 3px solid #ff3333; |
| border-radius: 10px; |
| display: none; |
| text-align: center; |
| z-index: 10; |
| box-shadow: 0 0 15px #ff3333; |
| } |
| #messageText { |
| margin-bottom: 15px; |
| } |
| |
| @media (max-width: 600px) { |
| body { |
| padding: 10px; |
| } |
| #gameCanvas { |
| margin-bottom: 15px; |
| } |
| .game-button { |
| padding: 8px 15px; |
| font-size: 0.8em; |
| } |
| #messageBox { |
| padding: 20px; |
| font-size: 0.9em; |
| } |
| } |
| </style> |
| </head> |
| <body> |
|
|
| <h1 class="text-2xl mb-4 text-center">贪吃蛇</h1> |
| <div id="score" class="text-lg mb-2">分数: 0</div> |
|
|
| <canvas id="gameCanvas"></canvas> |
|
|
| <div class="game-controls"> |
| <button id="resetButton" class="game-button">重新开始</button> |
| </div> |
|
|
| <div id="messageBox"> |
| <div id="messageText">游戏结束!</div> |
| <button id="closeMessageButton" class="game-button" style="background-color: #ff3333; color: #000;">关闭</button> |
| </div> |
|
|
| <script> |
| const canvas = document.getElementById('gameCanvas'); |
| const ctx = canvas.getContext('2d'); |
| const scoreElement = document.getElementById('score'); |
| const resetButton = document.getElementById('resetButton'); |
| const messageBox = document.getElementById('messageBox'); |
| const messageText = document.getElementById('messageText'); |
| const closeMessageButton = document.getElementById('closeMessageButton'); |
| |
| |
| const grid = 20; |
| const canvasSize = 400; |
| canvas.width = canvasSize; |
| canvas.height = canvasSize; |
| |
| |
| let snake; |
| let food; |
| let score; |
| let direction; |
| let nextDirection; |
| let bufferedDirection; |
| let isAligned; |
| let gameLoopTimeout; |
| let isGameOver; |
| |
| |
| function initGame() { |
| clearTimeout(gameLoopTimeout); |
| hideMessage(); |
| isGameOver = false; |
| |
| |
| snake = [ |
| { x: Math.floor(canvasSize / grid / 2) * grid, y: Math.floor(canvasSize / grid / 2) * grid } |
| ]; |
| direction = 'right'; |
| nextDirection = null; |
| bufferedDirection = null; |
| isAligned = false; |
| |
| |
| score = 0; |
| scoreElement.textContent = `分数: ${score}`; |
| |
| |
| placeFood(); |
| |
| |
| gameLoop(); |
| } |
| |
| |
| function placeFood() { |
| let newFoodPosition; |
| do { |
| newFoodPosition = { |
| x: Math.floor(Math.random() * (canvasSize / grid)) * grid, |
| y: Math.floor(Math.random() * (canvasSize / grid)) * grid |
| }; |
| } while (isFoodOnSnake(newFoodPosition)); |
| food = newFoodPosition; |
| } |
| |
| |
| function isFoodOnSnake(position) { |
| for (let i = 0; i < snake.length; i++) { |
| if (snake[i].x === position.x && snake[i].y === position.y) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| |
| function gameLoop() { |
| if (isGameOver) { |
| return; |
| } |
| |
| |
| const speed = 150; |
| |
| gameLoopTimeout = setTimeout(() => { |
| |
| ctx.clearRect(0, 0, canvasSize, canvasSize); |
| |
| |
| update(); |
| |
| |
| draw(); |
| |
| |
| requestAnimationFrame(gameLoop); |
| }, speed); |
| } |
| |
| |
| function update() { |
| |
| const head = snake[0]; |
| isAligned = (head.x === food.x || head.y === food.y); |
| |
| |
| if (isAligned) { |
| |
| if (nextDirection) { |
| |
| if (!isOppositeDirection(nextDirection, direction)) { |
| bufferedDirection = nextDirection; |
| } |
| nextDirection = null; |
| } |
| |
| } else { |
| |
| |
| if (bufferedDirection) { |
| |
| if (!isOppositeDirection(bufferedDirection, direction)) { |
| direction = bufferedDirection; |
| } |
| bufferedDirection = null; |
| nextDirection = null; |
| } |
| |
| else if (nextDirection) { |
| |
| if (!isOppositeDirection(nextDirection, direction)) { |
| direction = nextDirection; |
| } |
| nextDirection = null; |
| } |
| } |
| |
| |
| let newHead = { x: head.x, y: head.y }; |
| switch (direction) { |
| case 'up': newHead.y -= grid; break; |
| case 'down': newHead.y += grid; break; |
| case 'left': newHead.x -= grid; break; |
| case 'right': newHead.x += grid; break; |
| } |
| |
| |
| |
| if (newHead.x < 0 || newHead.x >= canvasSize || newHead.y < 0 || newHead.y >= canvasSize) { |
| gameOver("撞到墙了!"); |
| return; |
| } |
| |
| for (let i = 1; i < snake.length; i++) { |
| if (newHead.x === snake[i].x && newHead.y === snake[i].y) { |
| gameOver("撞到自己了!"); |
| return; |
| } |
| } |
| |
| |
| snake.unshift(newHead); |
| |
| |
| |
| if (newHead.x === food.x && newHead.y === food.y) { |
| score++; |
| scoreElement.textContent = `分数: ${score}`; |
| placeFood(); |
| |
| } else { |
| |
| |
| |
| } |
| |
| |
| |
| |
| |
| |
| if (!(newHead.x === food.x && newHead.y === food.y)) { |
| snake.pop(); |
| } |
| |
| |
| } |
| |
| |
| function draw() { |
| |
| ctx.fillStyle = '#33ff33'; |
| snake.forEach(segment => { |
| ctx.fillRect(segment.x, segment.y, grid, grid); |
| ctx.strokeStyle = '#000000'; |
| ctx.strokeRect(segment.x, segment.y, grid, grid); |
| }); |
| |
| |
| ctx.fillStyle = '#ff3333'; |
| ctx.fillRect(food.x, food.y, grid, grid); |
| ctx.strokeStyle = '#ffffff'; |
| ctx.strokeRect(food.x, food.y, grid, grid); |
| |
| |
| if (isAligned) { |
| ctx.fillStyle = 'rgba(255, 255, 0, 0.3)'; |
| |
| |
| |
| |
| ctx.fillStyle = 'yellow'; |
| ctx.fillRect(snake[0].x, snake[0].y, grid, grid); |
| } |
| } |
| |
| |
| function isOppositeDirection(dir1, dir2) { |
| return (dir1 === 'up' && dir2 === 'down') || |
| (dir1 === 'down' && dir2 === 'up') || |
| (dir1 === 'left' && dir2 === 'right') || |
| (dir1 === 'right' && dir2 === 'left'); |
| } |
| |
| |
| |
| document.addEventListener('keydown', (e) => { |
| if (isGameOver) return; |
| |
| let requestedDir = null; |
| switch (e.key) { |
| case 'ArrowUp': |
| case 'w': |
| requestedDir = 'up'; |
| break; |
| case 'ArrowDown': |
| case 's': |
| requestedDir = 'down'; |
| break; |
| case 'ArrowLeft': |
| case 'a': |
| requestedDir = 'left'; |
| break; |
| case 'ArrowRight': |
| case 'd': |
| requestedDir = 'right'; |
| break; |
| } |
| |
| |
| |
| const effectiveCurrentDirection = bufferedDirection || direction; |
| if (requestedDir && |
| !isOppositeDirection(requestedDir, effectiveCurrentDirection) && |
| (!nextDirection || !isOppositeDirection(requestedDir, nextDirection))) |
| { |
| nextDirection = requestedDir; |
| } |
| |
| if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight'].includes(e.key)) { |
| e.preventDefault(); |
| } |
| }); |
| |
| |
| function gameOver(reason) { |
| isGameOver = true; |
| clearTimeout(gameLoopTimeout); |
| showMessage(`游戏结束! ${reason}<br>最终分数: ${score}`); |
| } |
| |
| |
| function showMessage(msg) { |
| messageText.innerHTML = msg; |
| messageBox.style.display = 'block'; |
| } |
| |
| |
| function hideMessage() { |
| messageBox.style.display = 'none'; |
| } |
| |
| |
| resetButton.addEventListener('click', initGame); |
| closeMessageButton.addEventListener('click', hideMessage); |
| |
| |
| initGame(); |
| |
| </script> |
|
|
| </body> |
| </html> |
|
|