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index.js
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index.js
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// Game Constants & Variables
let inputDir = {x: 0, y: 0};
const foodSound = new Audio('bite.mp3');
const gameOverSound = new Audio('out.wav');
const moveSound = new Audio('move.mp3');
const musicSound = new Audio('bg.mp3');
let speed = 15;
let score = 0;
let lastPaintTime = 0;
let snakeArr = [
{x: 13, y: 15}
];
food = {x: 6, y: 7};
// Game Functions
function main(ctime) {
window.requestAnimationFrame(main);
// console.log(ctime)
if((ctime - lastPaintTime)/1000 < 1/speed){
return;
}
lastPaintTime = ctime;
gameEngine();
}
function isCollide(snake) {
// If you bump into yourself
for (let i = 1; i < snakeArr.length; i++) {
if(snake[i].x === snake[0].x && snake[i].y === snake[0].y){
return true;
}
}
// If you bump into the wall
if(snake[0].x >= 18 || snake[0].x <=0 || snake[0].y >= 18 || snake[0].y <=0){
return true;
}
return false;
}
function gameEngine(){
// Part 1: Updating the snake array & Food
if(isCollide(snakeArr)){
gameOverSound.play();
musicSound.pause();
inputDir = {x: 0, y: 0};
alert("Game Over. Press any key to play again!");
snakeArr = [{x: 13, y: 15}];
musicSound.play();
score = 0;
}
// If you have eaten the food, increment the score and regenerate the food
if(snakeArr[0].y === food.y && snakeArr[0].x ===food.x){
foodSound.play();
score += 1;
if(score>hiscoreval){
hiscoreval = score;
localStorage.setItem("hiscore", JSON.stringify(hiscoreval));
hiscoreBox.innerHTML = "HiScore: " + hiscoreval;
}
scoreBox.innerHTML = "Score: " + score;
snakeArr.unshift({x: snakeArr[0].x + inputDir.x, y: snakeArr[0].y + inputDir.y});
let a = 2;
let b = 16;
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;
// Part 2: Display the snake and Food
// Display the 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('snake');
}
board.appendChild(snakeElement);
});
// Display the food
foodElement = document.createElement('div');
foodElement.style.gridRowStart = food.y;
foodElement.style.gridColumnStart = food.x;
foodElement.classList.add('food')
board.appendChild(foodElement);
}
// Main logic starts here
musicSound.play();
let hiscore = localStorage.getItem("hiscore");
if(hiscore === null){
hiscoreval = 0;
localStorage.setItem("hiscore", JSON.stringify(hiscoreval))
}
else{
hiscoreval = JSON.parse(hiscore);
hiscoreBox.innerHTML = "HiScore: " + hiscore;
}
window.requestAnimationFrame(main);
window.addEventListener('keydown', e =>{
inputDir = {x: 0, y: 1} // Start the game
moveSound.play();
switch (e.key) {
case "ArrowUp":
console.log("ArrowUp");
inputDir.x = 0;
inputDir.y = -1;
break;
case "ArrowDown":
console.log("ArrowDown");
inputDir.x = 0;
inputDir.y = 1;
break;
case "ArrowLeft":
console.log("ArrowLeft");
inputDir.x = -1;
inputDir.y = 0;
break;
case "ArrowRight":
console.log("ArrowRight");
inputDir.x = 1;
inputDir.y = 0;
break;
default:
break;
}
});