// Created by Madhav var aiLevel = 0.03; var run ; function init() { //for sound effects var music = document.getElementById("music"); var win = document.getElementById("win"); var lose = document.getElementById("lose"); win.volume=0; lose.volume=0; music.play(); document.getElementsByClassName('tab')[0].style.transform='scale(0)'; document.getElementsByClassName('tab')[0].style.animation='' ; //Just some canvas setup stuff var canvas = document.getElementById("canvas"); var ctx = canvas.getContext('2d'); var h = canvas.height = 450; var w = canvas.width = 284; var fps = 40 ; //ball object const ball = { x : w/2 , y : h/2 , r : 10 , speed : 7.5, maxSpeed : 34, dx : 3, dy : 5, color : "red" , } //user paddle const user = { x : 95 , y : h - 30, height : 10 , width : 100 , point : 00, color : "cyan" , } //AI paddle const ai = { x : 95, y : 20, height : 10 , width : 100 , point : 00, color : "WHITE" , } //The net const net = { x : 2, y : h/2, height : 5 , width : 10 , point : 0, color : "white" , } // draw a rectangle, will be used to draw paddles function drawRect(x, y, w, h, color){ ctx.fillStyle = color; ctx.fillRect(x, y, w, h); } // draw circle, will be used to draw the ball function drawArc(x, y, r, color){ ctx.fillStyle = color; ctx.beginPath(); ctx.arc(x,y,r,0,Math.PI*2,true); ctx.closePath(); ctx.fill(); } //to draw net function drawNet() { for(let i = 0; i<19;i ++) { drawRect(net.x + 15*i, net.y, net.width, net.height, net.color); } } //to draw text i.e points function drawText(text,x,y) { ctx.fillStyle = "#FFF"; ctx.font = "30px Sarabun"; ctx.fillText(text, x, y); } // when ai or user scores, we reset the ball function resetBall(){ ball.x = canvas.width/2; ball.y = canvas.height/2; ball.speed = 7.5; ball.dy=-ball.dy; } // collision detection function collision(b,p,dir){ p.top = p.y - dir*p.height; p.left = p.x - p.width/5; p.right = p.x + p.width + 20 ; b.top = b.y + dir*b.r; b.left = b.x - b.r ; b.right = b.x + b.r ; var hitX = b.left > p.left && b.right < p.right; var hitY = false; if(dir === 1){ hitY = b.dy > 0 && b.y >= p.top; } if(dir === -1){ hitY = b.dy < 0 && b.y <= p.top + p.width/7; } return hitY && hitX; } //mousemove eventListener controls window.addEventListener("mousemove",function(evt) { user.x = evt.x - user.width ; evt.preventDefault(); }); //touchmove eventListener controls canvas.addEventListener("touchmove", function(e){ var rect = canvas.getBoundingClientRect(); var root = document.documentElement; var touch = e.changedTouches[0]; var touchX = parseInt(touch.clientX) - rect.top - root.scrollTop ; e.preventDefault(); user.x = touchX - (user.width/2);}); //keyboard controls window.addEventListener("keydown", function(e) { console.log(e); //arrow left if (e.key == "ArrowLeft") { user.x-=10; } //arrow right else if (e.key =="ArrowRight") { user.x+=10; } }); //to update everything function update () { //to change points if( ball.y - ball.r < 0 ) { user.point++; resetBall(); }else if( ball.y + ball.r >h ){ ai.point++; resetBall(); } //moving the ball ball.x += ball.dx; ball.y += ball.dy; //to bounce off the ball from the edge if(ball.x - ball.r - 2 < 0 || ball.x + ball.r + 2> w){ ball.dx = -ball.dx; } // we check if the paddle hit the user or the ai paddle var player = (ball.y + ball.r < h/2)?ai:user; var dir = (ball.y + ball.r < h/2)?-1:1; //After collision effect if(collision(ball,player,dir)&&(ball.x+ball.r+20)) { // we check where the ball hits the paddle let collidePoint =ball.x - (player.x+player.width/2); collidePoint = collidePoint / (player.width/2); //angle let angleRad = -(Math.PI/4) * collidePoint; ball.dy = -dir*ball.speed * Math.cos(angleRad); ball.dx = -dir*dir*ball.speed * Math.sin(angleRad); // speed up the ball everytime a paddle hits it. if(ball.speed

pong