zyckk4.github.io/greedy_snake.html at main · zyckk4/zyckk4.github.io · GitHub

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<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <title>贪吃蛇小游戏</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background-color: #222;
            margin: 0;
            color: #fff;
        }

        canvas {
            border: 1px solid #fff;
            margin-bottom: 1rem;
        }

        .controls {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 1rem;
        }

        button {
            background-color: #4CAF50;
            border: none;
            color: white;
            padding: 8px 16px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            border-radius: 4px;
            cursor: pointer;
        }

        button:hover {
            background-color: #45a049;
        }
    </style>
</head>

<body>
    <canvas id="game" width="320" height="320"></canvas>
    <div class="controls">
        <div>
            <label for="speed">速度：</label>
            <input type="range" id="speed" min="50" max="500" value="100" style="width: 50%;">
        </div>
        <button id="pause">暂停</button>
    </div>
    <script>
        const canvas = document.getElementById('game');
        const context = canvas.getContext('2d');
        const gridSize = 20;
        let snakeSpeed = 100;
        let snake = [{ x: 160, y: 160 }];
        let food;
        let velocity = { x: 0, y: -gridSize };
        let lastTime = 0;
        let paused = false;
        let score = 0;

        function main(currentTime) {
            if (!paused && currentTime - lastTime > snakeSpeed) {
                lastTime = currentTime;
                update();
                draw();
            }
            requestAnimationFrame(main);
        }

        let highScore = 0;

        function update() {
            const head = { x: snake[0].x + velocity.x, y: snake[0].y + velocity.y };
            snake.unshift(head);

            if (head.x === food.x && head.y === food.y) {
                food = generateFood();
                score += 10;
            } else {
                snake.pop();
            }

            if (head.x < 0 || head.x >= canvas.width || head.y < 0 || head.y >= canvas.height || checkCollision(head)) {
                // 更新历史最高分数
                if (score > highScore) {
                    highScore = score;
                }
                snake = [{ x: 160, y: 160 }];
                velocity = { x: 0, y: -gridSize };
                score = 0;
            }
        }

        function drawSnakePart(part, isHead) {
            if (isHead) {
                context.fillStyle = 'darkgreen';
                context.beginPath();
                context.arc(part.x + gridSize / 2, part.y + gridSize / 2, gridSize / 2, 0, 2 * Math.PI);
                context.fill();

                context.fillStyle = 'black';
                let eyeSize = gridSize / 4;
                let eyeOffsetX = gridSize / 4;
                let eyeOffsetY = gridSize / 4;

                if (velocity.x === gridSize) {
                    // 向右
                    context.beginPath();
                    context.arc(part.x + gridSize - eyeOffsetX, part.y + eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                    context.beginPath();
                    context.arc(part.x + gridSize - eyeOffsetX, part.y + gridSize - eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                } else if (velocity.x === -gridSize) {
                    // 向左
                    context.beginPath();
                    context.arc(part.x + eyeOffsetX, part.y + eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                    context.beginPath();
                    context.arc(part.x + eyeOffsetX, part.y + gridSize - eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                } else if (velocity.y === gridSize) {
                    // 向下
                    context.beginPath();
                    context.arc(part.x + eyeOffsetX, part.y + gridSize - eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                    context.beginPath();
                    context.arc(part.x + gridSize - eyeOffsetX, part.y + gridSize - eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                } else {
                    // 向上
                    context.beginPath();
                    context.arc(part.x + eyeOffsetX, part.y + eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                    context.beginPath();
                    context.arc(part.x + gridSize - eyeOffsetX, part.y + eyeOffsetY, eyeSize / 2, 0, 2 * Math.PI);
                    context.fill();
                }
            } else {
                context.fillStyle = 'lime';
                context.fillRect(part.x, part.y, gridSize, gridSize);
            }
        }

        function draw() {
            context.clearRect(0, 0, canvas.width, canvas.height);

            // 绘制蛇
            for (let i = 0; i < snake.length; i++) {
                drawSnakePart(snake[i], i === 0);
            }

            // 绘制食物
            context.fillStyle = 'red';
            context.fillRect(food.x, food.y, gridSize, gridSize);

            // 绘制当前得分
            context.fillStyle = 'white';
            context.font = '16px Arial';
            context.fillText(`分数: ${score}`, 10, 20);

            // 绘制历史最高分数
            context.fillText(`历史最高分数: ${highScore}`, 10, 40);
        }

        window.addEventListener('keydown', (event) => {
            if (event.key === 'p') {
                paused = !paused;
                document.getElementById('pause').textContent = paused ? '继续' : '暂停';
            }

            if (paused) return; // 暂停时禁止调整蛇头方向

            if ((event.key === 'ArrowUp' || event.key === 'w') && velocity.y === 0) velocity = { x: 0, y: -gridSize };
            if ((event.key === 'ArrowDown' || event.key === 's') && velocity.y === 0) velocity = { x: 0, y: gridSize };
            if ((event.key === 'ArrowLeft' || event.key === 'a') && velocity.x === 0) velocity = { x: -gridSize, y: 0 };
            if ((event.key === 'ArrowRight' || event.key === 'd') && velocity.x === 0) velocity = { x: gridSize, y: 0 };
        });

        document.getElementById('speed').addEventListener('input', (event) => {
            snakeSpeed = 600 - event.target.value;
        });

        // 初始化速度滑块位置以匹配初始速度
        document.getElementById('speed').value = 600 - snakeSpeed;

        function generateFood() {
            let newFood = {
                x: Math.floor(Math.random() * canvas.width / gridSize) * gridSize,
                y: Math.floor(Math.random() * canvas.height / gridSize) * gridSize,
            };

            // 检查食物是否在蛇身上
            for (const part of snake) {
                if (part.x === newFood.x && part.y === newFood.y) {
                    return generateFood(); // 重新生成食物
                }
            }

            return newFood;
        }

        function checkCollision(head) {
            for (let i = 1; i < snake.length; i++) {
                if (head.x === snake[i].x && head.y === snake[i].y) {
                    return true;
                }
            }
            return false;
        }

        document.getElementById('pause').addEventListener('click', () => {
            paused = !paused;
            document.getElementById('pause').textContent = paused ? '继续' : '暂停';
        });

        canvas.addEventListener('touchstart', (event) => {
            event.preventDefault();
            touchStartX = event.touches[0].clientX;
            touchStartY = event.touches[0].clientY;
        });

        canvas.addEventListener('touchmove', (event) => {
            event.preventDefault();
            let touchEndX = event.touches[0].clientX;
            let touchEndY = event.touches[0].clientY;
            let deltaX = touchEndX - touchStartX;
            let deltaY = touchEndY - touchStartY;

            if (Math.abs(deltaX) > Math.abs(deltaY)) {
                if (deltaX > 0 && velocity.x === 0) {
                    velocity = { x: gridSize, y: 0 };
                } else if (deltaX < 0 && velocity.x === 0) {
                    velocity = { x: -gridSize, y: 0 };
                }
            } else {
                if (deltaY > 0 && velocity.y === 0) {
                    velocity = { x: 0, y: gridSize };
                } else if (deltaY < 0 && velocity.y === 0) {
                    velocity = { x: 0, y: -gridSize };
                }
            }

            touchStartX = touchEndX;
            touchStartY = touchEndY;
        });

        food = generateFood(); // 生成初始食物
        main();
    </script>
</body>

</html>