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index.js
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index.js
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let inputdir = { x: 0, y: 0 };
const foodSound = new Audio('food.mp3');
const gameOverSound = new Audio('gameover.mp3');
const moveSound = new Audio('move.mp3');
const musicSound = new Audio('music.mp3');
let speed = 8;
let score = 0;
let lastpointtime = 0;
let snakeArr = [{ x: 15, y: 15 }];
let food = { x: 12, y: 10 };
//game functions
function main(ctime) {
window.requestAnimationFrame(main);
if ((ctime - lastpointtime) / 1000 < 1 / speed) {
return;
}
lastpointtime = ctime;
gameEngine();
}
function iscolide(snake) {
//if you bump into yourself
for (let i = 1; i < snake.length; i++) {
if (snake[0].x === snake[i].x && snake[0].y === snake[i].y) {
musicSound.pause();
musicSound.currentTime = 0;
inputdir = { x: 0, y: 0 };
alert("GAME OVER!");
snakeArr = [{ x: 15, y: 15 }];
score = 0;
}
}
//if it bump into wall
if (snake[0].x >= 22 || snake[0].x <= 0 || snake[0].y >= 22 || snake[0].y <= 0) {
return true;
}
return false;
}
function gameEngine() {
//updating snakeArr and Food
if (iscolide(snakeArr)) {
musicSound.pause();
musicSound.currentTime = 0;
inputdir = { x: 0, y: 0 };
gameOverSound.play();
alert("GAME OVER!");
snakeArr = [{ x: 15, y: 15 }];
score = 0;
scoreBox.innerHTML = "Score: " + score;
}
//if you have eaten the food then increment the score and regenerate the food
if (snakeArr[0].x === food.x && snakeArr[0].y === food.y) {
score += 1;
scoreBox.innerHTML = "Score: " + score;
foodSound.play();
snakeArr.unshift({ x: snakeArr[0].x + inputdir.x, y: snakeArr[0].y + inputdir.y });
let a = 2;
let b = 20;
food = { x: Math.round(a + (b - a) * Math.random()), y: Math.round(a + (b - a) * Math.random()) }
}
//moving the snake
for (let i = snakeArr.length - 2; i >= 0; i--) {
snakeArr[i + 1] = { ...snakeArr[i] };
}
snakeArr[0].x += inputdir.x;
snakeArr[0].y += inputdir.y;
//displaying snake and food
//display snake
board.innerHTML = "";
snakeArr.forEach((e, index) => {
snakeElement = document.createElement('div');
snakeElement.style.gridRowStart = e.y;
snakeElement.style.gridColumnStart = e.x;
if (index === 0) {
snakeElement.classList.add('head');
}
else {
snakeElement.classList.add('snakebody');
}
board.appendChild(snakeElement);
});
// display food
foodElement = document.createElement('div');
foodElement.style.gridRowStart = food.y;
foodElement.style.gridColumnStart = food.x;
foodElement.classList.add('food');
board.appendChild(foodElement);
}
//main logic function
window.requestAnimationFrame(main);
window.addEventListener('keydown', e => {
inputdir = { x: 0, y: 0 };
moveSound.play();
switch (e.key) {
case 'ArrowUp':
musicSound.play();
inputdir.x = 0;
inputdir.y = -1;
break;
case 'ArrowDown':
musicSound.play();
inputdir.x = 0;
inputdir.y = 1;
break;
case 'ArrowLeft':
musicSound.play();
inputdir.x = -1;
inputdir.y = 0;
break;
case 'ArrowRight':
musicSound.play();
inputdir.x = 1;
inputdir.y = 0;
break;
default:
break;
}
});