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index.js
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index.js
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document.addEventListener('DOMContentLoaded', function () {
const board = document.getElementById('game-board');
const scoreDisplay = document.getElementById('score');
const highScoreDisplay = document.getElementById('highScore');
const gridSize = 20;
let snake = [{ x: 10, y: 10 }];
let food = { x: 5, y: 5 };
let direction = 'right';
let score = 0;
let highScore = parseInt(localStorage.getItem('highScore')) || 0;
let gameRunning = false;
function createBoard() {
for (let row = 0; row < gridSize; row++) {
for (let col = 0; col < gridSize; col++) {
const cell = document.createElement('div');
cell.className = 'cell';
cell.id = `${row}-${col}`;
board.appendChild(cell);
}
}
}
function drawSnake() {
snake.forEach(segment => {
const cell = document.getElementById(`${segment.y}-${segment.x}`);
cell.classList.add('snake');
});
}
function drawFood() {
const cell = document.getElementById(`${food.y}-${food.x}`);
cell.classList.add('food');
}
function clearBoard() {
const cells = document.querySelectorAll('.cell');
cells.forEach(cell => {
cell.className = 'cell';
});
}
function update() {
clearBoard();
drawSnake();
drawFood();
updateScore();
}
function moveSnake() {
const head = { ...snake[0] };
switch (direction) {
case 'up':
head.y -= 1;
break;
case 'down':
head.y += 1;
break;
case 'left':
head.x -= 1;
break;
case 'right':
head.x += 1;
break;
}
snake.unshift(head);
if (head.x === food.x && head.y === food.y) {
score++;
updateHighScore();
food = {
x: Math.floor(Math.random() * gridSize),
y: Math.floor(Math.random() * gridSize)
};
} else {
snake.pop();
}
}
function checkCollision() {
const head = snake[0];
return (
head.x < 0 || head.y < 0 || head.x >= gridSize || head.y >= gridSize ||
snake.slice(1).some(segment => segment.x === head.x && segment.y === head.y)
);
}
function handleKeyPress(event) {
if (!gameRunning && event.code === 'Space') {
startGame();
instructions.style.display = 'none';
} else {
switch (event.key) {
case 'ArrowUp':
direction = 'up';
break;
case 'ArrowDown':
direction = 'down';
break;
case 'ArrowLeft':
direction = 'left';
break;
case 'ArrowRight':
direction = 'right';
break;
}
}
}
function gameLoop() {
if (gameRunning) {
moveSnake();
if (checkCollision()) {
endGame();
alert('Game over!');
resetGame();
}
update();
}
}
function resetGame() {
gameRunning = false;
snake = [{ x: 10, y: 10 }];
food = { x: 5, y: 5 };
direction = 'right';
score = 0;
updateScore();
updateHighScore();
}
function updateScore() {
scoreDisplay.innerText = `Score: ${score}`;
}
function updateHighScore() {
if (score > highScore) {
highScore = score;
localStorage.setItem('highScore', highScore);
highScoreDisplay.innerText = `High Score: ${highScore}`;
}
}
function startGame() {
gameRunning = true;
score = 0;
updateScore();
updateHighScore();
}
function endGame() {
gameRunning = false;
}
createBoard();
update();
document.addEventListener('keydown', handleKeyPress);
setInterval(gameLoop, 200);
});