snake-game/snake.htm at master · pe-cloud/snake-game · GitHub

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<!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Snake-Spiel</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #f0f0f0;
            font-family: Arial, sans-serif;
        }
        #game-container {
            text-align: center;
        }
        #game-board {
            border: 2px solid #333;
        }
        #score {
            font-size: 24px;
            margin-top: 10px;
        }
    </style>
</head>
<body>
    <div id="game-container">
        <canvas id="game-board" width="400" height="400"></canvas>
        <div id="score">Punkte: 0</div>
    </div>

    <script>
        const canvas = document.getElementById('game-board');
        const ctx = canvas.getContext('2d');
        const scoreElement = document.getElementById('score');

        const gridSize = 20;
        const tileCount = canvas.width / gridSize;

        let snake = [
            {x: 10, y: 10},
        ];
        let food = {x: 15, y: 15};
        let dx = 0;
        let dy = 0;
        let score = 0;

        function drawGame() {
            clearCanvas();
            moveSnake();
            drawSnake();
            drawFood();
            checkCollision();
            updateScore();
        }

        function clearCanvas() {
            ctx.fillStyle = 'white';
            ctx.fillRect(0, 0, canvas.width, canvas.height);
        }

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

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

        function drawSnake() {
            ctx.fillStyle = 'green';
            snake.forEach(segment => {
                ctx.fillRect(segment.x * gridSize, segment.y * gridSize, gridSize - 2, gridSize - 2);
            });
        }

        function drawFood() {
            ctx.fillStyle = 'red';
            ctx.fillRect(food.x * gridSize, food.y * gridSize, gridSize - 2, gridSize - 2);
        }

        function generateFood() {
            food.x = Math.floor(Math.random() * tileCount);
            food.y = Math.floor(Math.random() * tileCount);
        }

        function checkCollision() {
            const head = snake[0];

            if (head.x < 0 || head.x >= tileCount || head.y < 0 || head.y >= tileCount) {
                resetGame();
            }

            for (let i = 1; i < snake.length; i++) {
                if (head.x === snake[i].x && head.y === snake[i].y) {
                    resetGame();
                }
            }
        }

        function resetGame() {
            snake = [{x: 10, y: 10}];
            food = {x: 15, y: 15};
            dx = 0;
            dy = 0;
            score = 0;
        }

        function updateScore() {
            scoreElement.textContent = `Punkte: ${score}`;
        }

        document.addEventListener('keydown', changeDirection);

        function changeDirection(event) {
            const LEFT_KEY = 37;
            const RIGHT_KEY = 39;
            const UP_KEY = 38;
            const DOWN_KEY = 40;

            const keyPressed = event.keyCode;
            const goingUp = dy === -1;
            const goingDown = dy === 1;
            const goingRight = dx === 1;
            const goingLeft = dx === -1;

            if (keyPressed === LEFT_KEY && !goingRight) {
                dx = -1;
                dy = 0;
            }
            if (keyPressed === UP_KEY && !goingDown) {
                dx = 0;
                dy = -1;
            }
            if (keyPressed === RIGHT_KEY && !goingLeft) {
                dx = 1;
                dy = 0;
            }
            if (keyPressed === DOWN_KEY && !goingUp) {
                dx = 0;
                dy = 1;
            }
        }

        setInterval(drawGame, 100);
    </script>
</body>
</html>