385 lines
14 KiB
HTML
385 lines
14 KiB
HTML
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>自动贪吃蛇游戏 - 改进版</title>
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<style>
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body {
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margin: 0;
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padding: 20px;
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display: flex;
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justify-content: center;
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align-items: center;
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min-height: 100vh;
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background-color: #333;
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font-family: Arial, sans-serif;
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}
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.game-container {
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text-align: center;
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}
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canvas {
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border: 2px solid #fff;
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background-color: #111;
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}
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.info {
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color: #fff;
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margin: 10px 0;
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font-size: 18px;
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}
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.controls {
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margin-top: 20px;
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}
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button {
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padding: 10px 20px;
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font-size: 16px;
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background-color: #4CAF50;
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color: white;
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border: none;
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border-radius: 5px;
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cursor: pointer;
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margin: 0 5px;
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}
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button:hover {
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background-color: #45a049;
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}
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button:disabled {
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background-color: #666;
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cursor: not-allowed;
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}
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</style>
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</head>
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<body>
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<div class="game-container">
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<div class="info">
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<div>得分: <span id="score">0</span></div>
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<div>蛇长度: <span id="length">1</span></div>
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<div>游戏状态: <span id="status">准备开始</span></div>
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</div>
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<canvas id="gameCanvas" width="600" height="600"></canvas>
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<div class="controls">
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<button id="startBtn">开始游戏</button>
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<button id="pauseBtn" disabled>暂停</button>
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<button id="resetBtn">重置</button>
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</div>
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</div>
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<script>
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class SnakeGame {
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constructor() {
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this.canvas = document.getElementById('gameCanvas');
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this.ctx = this.canvas.getContext('2d');
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this.gridSize = 20;
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this.tileCount = this.canvas.width / this.gridSize;
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this.reset();
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this.setupEventListeners();
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}
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reset() {
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this.snake = [
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{x: 10, y: 10}
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];
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this.direction = {x: 0, y: 0};
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this.apple = this.generateApple();
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this.score = 0;
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this.gameRunning = false;
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this.gamePaused = false;
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this.gameLoop = null;
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this.speed = 100;
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this.updateUI();
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this.draw();
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}
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generateApple() {
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let apple;
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do {
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apple = {
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x: Math.floor(Math.random() * this.tileCount),
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y: Math.floor(Math.random() * this.tileCount)
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};
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} while (this.snake.some(segment => segment.x === apple.x && segment.y === apple.y));
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return apple;
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}
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setupEventListeners() {
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document.getElementById('startBtn').addEventListener('click', () => this.start());
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document.getElementById('pauseBtn').addEventListener('click', () => this.togglePause());
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document.getElementById('resetBtn').addEventListener('click', () => this.reset());
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}
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start() {
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if (!this.gameRunning) {
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this.gameRunning = true;
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this.gamePaused = false;
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document.getElementById('startBtn').disabled = true;
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document.getElementById('pauseBtn').disabled = false;
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this.gameStep();
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}
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}
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togglePause() {
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if (this.gameRunning) {
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this.gamePaused = !this.gamePaused;
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document.getElementById('pauseBtn').textContent = this.gamePaused ? '继续' : '暂停';
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if (!this.gamePaused) {
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this.gameStep();
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}
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}
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}
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gameStep() {
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if (!this.gameRunning || this.gamePaused) return;
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this.moveSnake();
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if (this.checkCollision()) {
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this.gameOver();
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return;
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}
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this.checkApple();
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this.draw();
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this.updateUI();
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// 使用改进的AI控制蛇的移动
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this.autoMove();
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setTimeout(() => this.gameStep(), this.speed);
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}
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autoMove() {
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// 改进的AI：优先保持直线移动，减少之字形路线
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const head = this.snake[0];
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const dx = this.apple.x - head.x;
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const dy = this.apple.y - head.y;
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// 如果当前方向是安全的且朝着苹果的大致方向，保持当前方向
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const nextX = head.x + this.direction.x;
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const nextY = head.y + this.direction.y;
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if (this.isSafeMove(nextX, nextY) && this.isMovingTowardsApple(this.direction, dx, dy)) {
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return; // 保持当前方向，走直线
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}
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// 否则，寻找最佳新方向
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const directions = this.getPrioritizedDirections(dx, dy);
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for (let dir of directions) {
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const testX = head.x + dir.x;
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const testY = head.y + dir.y;
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if (this.isSafeMove(testX, testY)) {
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this.direction = dir;
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return;
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}
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}
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// 如果没有找到安全方向，使用备用安全方向
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this.findSafeDirection(head);
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}
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isMovingTowardsApple(direction, dx, dy) {
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// 检查当前方向是否朝着苹果的大致方向
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if (dx > 0 && direction.x > 0) return true; // 苹果在右，向右移动
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if (dx < 0 && direction.x < 0) return true; // 苹果在左，向左移动
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if (dy > 0 && direction.y > 0) return true; // 苹果在下，向下移动
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if (dy < 0 && direction.y < 0) return true; // 苹果在上，向上移动
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return false;
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}
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getPrioritizedDirections(dx, dy) {
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// 根据苹果位置，返回优先级排序的方向
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const directions = [];
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// 确定主要方向
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let primaryHorizontal = dx > 0 ? {x: 1, y: 0} : {x: -1, y: 0};
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let primaryVertical = dy > 0 ? {x: 0, y: 1} : {x: 0, y: -1};
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// 根据距离决定优先级，但避免频繁改变方向
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if (Math.abs(dx) > Math.abs(dy)) {
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// 水平距离更大，优先水平移动
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directions.push(primaryHorizontal);
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directions.push(primaryVertical);
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} else if (Math.abs(dy) > Math.abs(dx)) {
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// 垂直距离更大，优先垂直移动
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directions.push(primaryVertical);
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directions.push(primaryHorizontal);
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} else {
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// 距离相等，保持当前方向优先
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if (this.direction.x !== 0) {
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directions.push(primaryHorizontal);
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directions.push(primaryVertical);
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} else {
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directions.push(primaryVertical);
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directions.push(primaryHorizontal);
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}
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}
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// 添加相反方向（最低优先级）
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directions.push({x: -primaryHorizontal.x, y: -primaryHorizontal.y});
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directions.push({x: -primaryVertical.x, y: -primaryVertical.y});
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return directions;
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}
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isSafeMove(x, y) {
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// 检查是否会撞墙
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if (x < 0 || x >= this.tileCount || y < 0 || y >= this.tileCount) {
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return false;
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}
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// 检查是否会撞到自己（除了尾巴）
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for (let i = 0; i < this.snake.length - 1; i++) {
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if (this.snake[i].x === x && this.snake[i].y === y) {
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return false;
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}
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}
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return true;
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}
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findSafeDirection(head) {
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// 尝试四个方向，找到安全的方向
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const directions = [
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{x: 1, y: 0}, // 右
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{x: -1, y: 0}, // 左
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{x: 0, y: 1}, // 下
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{x: 0, y: -1} // 上
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];
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for (let dir of directions) {
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const nextX = head.x + dir.x;
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const nextY = head.y + dir.y;
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if (this.isSafeMove(nextX, nextY)) {
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this.direction = dir;
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return;
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}
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}
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// 如果没有安全方向，保持当前方向（游戏即将结束）
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}
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moveSnake() {
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const head = {x: this.snake[0].x + this.direction.x, y: this.snake[0].y + this.direction.y};
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this.snake.unshift(head);
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// 如果没有吃到苹果，移除尾巴
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if (head.x !== this.apple.x || head.y !== this.apple.y) {
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this.snake.pop();
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}
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}
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checkCollision() {
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const head = this.snake[0];
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// 撞墙检测
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if (head.x < 0 || head.x >= this.tileCount || head.y < 0 || head.y >= this.tileCount) {
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return true;
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}
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// 撞到自己检测
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for (let i = 1; i < this.snake.length; i++) {
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if (head.x === this.snake[i].x && head.y === this.snake[i].y) {
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return true;
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}
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}
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return false;
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}
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checkApple() {
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const head = this.snake[0];
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if (head.x === this.apple.x && head.y === this.apple.y) {
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this.score += 10;
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this.apple = this.generateApple();
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// 检查是否填满整个地图
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if (this.snake.length >= this.tileCount * this.tileCount) {
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this.gameWin();
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}
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}
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}
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gameWin() {
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this.gameRunning = false;
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document.getElementById('status').textContent = '恭喜！蛇已铺满整个地图！';
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document.getElementById('startBtn').disabled = false;
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document.getElementById('pauseBtn').disabled = true;
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}
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gameOver() {
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this.gameRunning = false;
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document.getElementById('status').textContent = '游戏结束';
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document.getElementById('startBtn').disabled = false;
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document.getElementById('pauseBtn').disabled = true;
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}
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draw() {
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// 清空画布
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this.ctx.fillStyle = '#111';
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this.ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);
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// 画蛇
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this.ctx.fillStyle = '#4CAF50';
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for (let i = 0; i < this.snake.length; i++) {
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const segment = this.snake[i];
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this.ctx.fillRect(segment.x * this.gridSize, segment.y * this.gridSize, this.gridSize - 2, this.gridSize - 2);
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// 蛇头用不同颜色
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if (i === 0) {
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this.ctx.fillStyle = '#81C784';
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}
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}
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// 画苹果
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this.ctx.fillStyle = '#FF5722';
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this.ctx.fillRect(this.apple.x * this.gridSize, this.apple.y * this.gridSize, this.gridSize - 2, this.gridSize - 2);
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// 画网格
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this.ctx.strokeStyle = '#333';
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this.ctx.lineWidth = 1;
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for (let i = 0; i <= this.tileCount; i++) {
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this.ctx.beginPath();
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this.ctx.moveTo(i * this.gridSize, 0);
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this.ctx.lineTo(i * this.gridSize, this.canvas.height);
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this.ctx.stroke();
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this.ctx.beginPath();
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this.ctx.moveTo(0, i * this.gridSize);
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this.ctx.lineTo(this.canvas.width, i * this.gridSize);
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this.ctx.stroke();
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}
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}
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updateUI() {
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document.getElementById('score').textContent = this.score;
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document.getElementById('length').textContent = this.snake.length;
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if (this.gameRunning && !this.gamePaused) {
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document.getElementById('status').textContent = '游戏进行中';
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} else if (this.gamePaused) {
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document.getElementById('status').textContent = '游戏暂停';
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} else if (!this.gameRunning && this.snake.length > 1) {
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document.getElementById('status').textContent = '游戏结束';
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}
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}
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}
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// 初始化游戏
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window.addEventListener('DOMContentLoaded', () => {
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new SnakeGame();
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});
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</script>
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</body>
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</html>
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