Snake Game

Play Snake on any webpage by pressing 'S'

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/491883/1355808/Snake%20Game.js

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// ==UserScript==
// @name         Snake Game
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Play Snake on any webpage by pressing 'S'
// @author       You
// @match        https://*/*
// @match        http://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    let snakeInterval;
    let snake;
    let food;
    let direction;
    let score;

    function initSnake() {
        snake = [{x: 10, y: 10}];
        food = getRandomPosition();
        direction = 'right';
        score = 0;
        snakeInterval = setInterval(moveSnake, 100);
    }

    function getRandomPosition() {
        return {
            x: Math.floor(Math.random() * 20),
            y: Math.floor(Math.random() * 20)
        };
    }

    function moveSnake() {
        const head = { ...snake[0] };

        switch (direction) {
            case 'up':
                head.y--;
                break;
            case 'down':
                head.y++;
                break;
            case 'left':
                head.x--;
                break;
            case 'right':
                head.x++;
                break;
        }

        if (head.x < 0 || head.x >= 20 || head.y < 0 || head.y >= 20 || isSnakeCollided(head)) {
            clearInterval(snakeInterval);
            alert('Game Over! Score: ' + score);
            initSnake();
            return;
        }

        snake.unshift(head);

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

        drawSnake();
    }

    function isSnakeCollided(head) {
        return snake.some(segment => segment.x === head.x && segment.y === head.y);
    }

    function drawSnake() {
        const canvas = document.getElementById('snakeCanvas');
        const ctx = canvas.getContext('2d');

        ctx.clearRect(0, 0, canvas.width, canvas.height);

        snake.forEach(segment => {
            ctx.fillStyle = 'green';
            ctx.fillRect(segment.x * 20, segment.y * 20, 20, 20);
        });

        ctx.fillStyle = 'red';
        ctx.fillRect(food.x * 20, food.y * 20, 20, 20);
    }

    function handleKeydown(event) {
        switch (event.key) {
            case 'ArrowUp':
                direction = 'up';
                break;
            case 'ArrowDown':
                direction = 'down';
                break;
            case 'ArrowLeft':
                direction = 'left';
                break;
            case 'ArrowRight':
                direction = 'right';
                break;
            case 's':
            case 'S':
                if (!snakeInterval) {
                    initSnake();
                }
                break;
        }
    }

    function createCanvas() {
        const canvas = document.createElement('canvas');
        canvas.id = 'snakeCanvas';
        canvas.width = 400;
        canvas.height = 400;
        canvas.style.border = '1px solid black';
        canvas.style.position = 'fixed';
        canvas.style.top = '50%';
        canvas.style.left = '50%';
        canvas.style.transform = 'translate(-50%, -50%)';
        canvas.style.zIndex = '9999';
        document.body.appendChild(canvas);
    }

    createCanvas();
    document.addEventListener('keydown', handleKeydown);

})();