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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('./voice/food.mp3');
// const gameOverSound=new Audio('./voice/gameover.mp3');
const moveSound=new Audio('');
const musicSound=new Audio('./voice/music.mp3');
let speed=5;
let score=0;
let highscore=localStorage.getItem("score")||score
let lastPaintTime=0;
let snakeArr=[
{x:13, y:15}
]
food={x:6, y:7};
// function for manual speed
speedfun()
function speedfun(){
let sp=document.getElementById("speed").value
speed=+sp
}
//game function
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>=20||snake[0].x<=0 || snake[0].y>=20||snake[0].y<=0){
return true;
}
}
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!");
if(highscore<=score){
localStorage.setItem("score",score)
let highscoreBox=document.getElementById("highscoreBox")
highscoreBox.innerHTML="High Score: "+ score;
}
window.location.reload()
snakeArr=[{x:13,y:15}];
//musicSound.play();
score=0;
}
let highscoreBox=document.getElementById("highscoreBox")
highscoreBox.innerHTML="High Score: "+ highscore;
//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
scoreBox.innerHTML="Score: "+ score;
snakeArr.unshift({x: snakeArr[0].x+inputDir.x,y: snakeArr[0].y+inputDir.y});
let a= 2;
let b= 18;
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--){
//const element = array[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;
snakeElement.classList.add('snake');
if(index===0){
snakeElement.classList.add('head');
}
else{
snakeElement.classList.add('snake');
}
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 starts here
window.requestAnimationFrame(main);
window.addEventListener('keydown', e=>{
inputDir={x:0, y:1}
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;
}
});
function buttonup(){
inputDir.x= 0;
inputDir.y= -1;
}
function buttondown(){
inputDir.x= 0;
inputDir.y= 1;
}
function buttonleft(){
inputDir.x= -1;
inputDir.y= 0;
}
function buttonright(){
inputDir.x= 1;
inputDir.y= 0;
}