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script.js
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script.js
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// getting the caption element
const canvas=document.getElementById("canvas");
// getting the context without context we can't draw on the canvas and it contains varout methods and properties to which helps to draw on the canvas
const ctx=canvas.getContext("2d");
canvas.height=745;
canvas.width=1000;
const canvasHeight=canvas.height;
const canvasWidth=canvas.width;
const paddleHeight=10;
const paddleWidth=180;
const netHeight=2;
const netWidth=6;
let leftArrowKeyPressed=false;
let rightArrowKeyPressed=false;
// sounds
let hitSound=new Audio("../sounds/sounds_hitSound.wav");
let scoreSound=new Audio("../sounds/sounds_scoreSound.wav");
let wallHitSound=new Audio("../sounds/sounds_wallHitSound.wav");
// objects
// user
const user={
x:(canvasWidth/2)-(paddleWidth/2),
y:10,
height:paddleHeight,
width:paddleWidth,
color:"blue",
score:0
}
// computer
const computer={
x:(canvasWidth/2)-(paddleWidth/2),
y:canvasHeight-(paddleHeight + 10),
height:paddleHeight,
width:paddleWidth,
color:"purple",
score:0
}
//net
const net={
x:0,
y:(canvasHeight/2)-(netHeight/2),
height:netHeight,
width:netWidth,
color:"white"
}
//ball
const ball={
x:canvasWidth/2,
y:canvasHeight/2,
radius:10,
speed:5,
velocityX:5,
velocityY:5,
color:'red'
}
// functions
// draw board
function drawBoard(){
ctx.fillStyle="black";
ctx.fillRect(0 , 0 , canvasWidth , canvasHeight);
}
// draw net
function drawNet(){
for(let i=0 ; i<canvasWidth ; i+=15){
ctx.fillStyle=net.color;
ctx.fillRect(net.x+i , net.y , net.width , net.height);
}
}
// draw score
function drawScore(x , y , score){
ctx.fillStyle="white";
ctx.font="35px monospace";
ctx.fillText(score , x , y);
}
// draw paddle
function drawPaddle(x , y , width , height , color){
ctx.fillStyle=color;
ctx.fillRect(x , y , width , height);
}
// draw ball
function drawBall(x , y , radius , color){
ctx.fillStyle=color;
ctx.beginPath();
ctx.arc(x , y , radius , 0 , Math.PI*2 ,false);
ctx.closePath();
ctx.fill();
}
// key movement handler
window.addEventListener("keydown" , keyDownHandler);
window.addEventListener("keyup" , keyUpHandler);
function keyDownHandler(event){
switch(event.key){
case 'a':
leftArrowKeyPressed=true;
break;
case 'd':
rightArrowKeyPressed=true;
break;
}
}
function keyUpHandler(event){
switch(event.key){
case 'a':
leftArrowKeyPressed=false;
break;
case 'd':
rightArrowKeyPressed=false;
break;
}
}
// reset function
function reset(){
ball.x=(canvasWidth/2);
ball.y=(canvasHeight/2);
ball.speed=5;
// changing the direction of the ball
ball.velocityX=0;
ball.velocityY=-ball.velocityY;
}
// collision function
function collision(ball , player){
player.left=player.x;
player.top=player.y;
player.right=player.x + player.width;
player.bottom=player.y + player.height;
ball.left=ball.x-ball.radius;
ball.top=ball.y-ball.radius;
ball.right=ball.x + ball.radius;
ball.bottom=ball.y + ball.radius;
return (ball.left < player.right && ball.top < player.bottom && ball.right > player.left && ball.bottom > player.top);
}
// update function
function update(){
// move the user paddle
if(leftArrowKeyPressed && user.x > 0){
user.x-=10;
computer.x-=10;
}
else if(rightArrowKeyPressed && user.x < canvasWidth-user.width){
user.x+=10;
computer.x+=10;
}
// checking if balll hits the left and right ball
if(ball.x - ball.radius <= 0 || ball.x + ball.radius >= canvas.width){
wallHitSound.play();
ball.velocityX=-ball.velocityX;
}
// if ball hit on the down wall
if(ball.y + ball.radius >= canvas.height){
scoreSound.play();
user.score+=10;
reset("user");
}
if(ball.y - ball.radius <= 0){
scoreSound.play();
computer.score+=10;
reset("computer");
}
// move the ball
ball.x+=ball.velocityX;
ball.y+=ball.velocityY;
// move computer paddle
// computer.x += ((ball.x - (computer.x + computer.width/2))) * 0.9;
// detecting ball hit to which paddle
let player=(ball.y < (canvasHeight/2)) ? user : computer;
if(collision(ball , player)){
// sound plays
hitSound.play();
let angle=0;
// if ball hit on the upper half left side then it should deflect back at an angle of -45 deg
if(ball.x < (player.x + player.width/2)){
angle = -1 * Math.PI / 4;
}
// if ball hit on the lower half right side then it should deflect back at an angle of 45 deg
else if(ball.x > (player.x + player.width/2)){
angle = Math.PI/ 4;
}
// if ball hit at the center of the paddle than it should deflect back at an angle of 0 deg
else{
angle=0;
}
// change the velocity of the ball which paddle hit the ball
let sign=(player===user) ? 1 : -1;
ball.velocityX=ball.speed * Math.sin(angle);
ball.velocityY=sign * ball.speed * Math.cos(angle);
// increasing the ball speed
ball.speed+=0.4;
}
}
// render function draws everything on the function
function render(){
//drawing the canvas
drawBoard();
// drewing the net on the canvas
drawNet();
// drawing the score on the canvas
// user score
drawScore(canvasWidth/15 , canvasHeight/4 , user.score);
// computer score
drawScore(canvasWidth/15 , (3*canvasHeight)/4 , computer.score);
// player -1
drawScore(canvasWidth/60 , (canvasHeight/2)-30 , "Player-1")
drawScore(canvasWidth/60 , (canvasHeight/2)+45 , "Player-2")
// draw paddle
// user paddle
drawPaddle(user.x , user.y , user.width , user.height , user.color);
// computer paddle
drawPaddle(computer.x , computer.y , computer.width , computer.height , computer.color);
//drawing the ball
drawBall(ball.x , ball.y , ball.radius , ball.color);
}
function gameLoop(){
update();
render();
}
function initalDisplay(){
//drawing the canvas
drawBoard();
// user paddle
drawPaddle(user.x , user.y , user.width , user.height , user.color);
// computer paddle
drawPaddle(computer.x , computer.y , computer.width , computer.height , computer.color);
}
initalDisplay();
window.addEventListener("keypress" , function(e){
if(e.key=="Enter"){
var interval=setInterval(function(){
gameLoop();
} , 1000/60);
document.querySelector(".strip").style.display="none";
}
})