Snake Game

Play Snake on any webpage by pressing 'S'

Script này sẽ không được không được cài đặt trực tiếp. Nó là một thư viện cho các script khác để bao gồm các chỉ thị meta // @require https://update.greasyfork.org/scripts/491883/1355808/Snake%20Game.js 

// ==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);

})();