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function paintCanvas(){ctx.fillStyle="black",ctx.fillRect(0,0,W,H)}function Paddle(a){this.h=5,this.w=150,this.x=W/2-this.w/2,this.y="top"==a?0:H-this.h}function createParticles(a,b,c){this.x=a||0,this.y=b||0,this.radius=1.2,this.vx=-1.5+3*Math.random(),this.vy=c*Math.random()*1.5}function draw(){paintCanvas();for(var a=0;a<paddles.length;a++)p=paddles[a],ctx.fillStyle="white",ctx.fillRect(p.x,p.y,p.w,p.h);ball.draw(),update()}function increaseSpd(){points%4==0&&Math.abs(ball.vx)<15&&(ball.vx+=ball.vx<0?-1:1,ball.vy+=ball.vy<0?-2:2)}function trackPosition(a){mouse.x=a.pageX,mouse.y=a.pageY}function update(){if(updateScore(),mouse.x&&mouse.y)for(var a=1;a<paddles.length;a++)p=paddles[a],p.x=mouse.x-p.w/2;if(ball.x+=ball.vx,ball.y+=ball.vy,p1=paddles[1],p2=paddles[2],collides(ball,p1)?collideAction(ball,p1):collides(ball,p2)?collideAction(ball,p2):(ball.y+ball.r>H?(ball.y=H-ball.r,gameOver()):ball.y<0&&(ball.y=ball.r,gameOver()),ball.x+ball.r>W?(ball.vx=-ball.vx,ball.x=W-ball.r):ball.x-ball.r<0&&(ball.vx=-ball.vx,ball.x=ball.r)),1==flag)for(var b=0;b<particlesCount;b++)particles.push(new createParticles(particlePos.x,particlePos.y,multiplier));emitParticles(),flag=0}function collides(a,b){return a.x+ball.r>=b.x&&a.x-ball.r<=b.x+b.w?a.y>=b.y-b.h&&b.y>0?(paddleHit=1,!0):a.y<=b.h&&0==b.y?(paddleHit=2,!0):!1:void 0}function collideAction(a,b){a.vy=-a.vy,1==paddleHit?(a.y=b.y-b.h,particlePos.y=a.y+a.r,multiplier=-1):2==paddleHit&&(a.y=b.h+a.r,particlePos.y=a.y-a.r,multiplier=1),points++,increaseSpd(),collision&&(points>0&&collision.pause(),collision.currentTime=0,collision.play()),particlePos.x=a.x,flag=1}function emitParticles(){for(var a=0;a<particles.length;a++)par=particles[a],ctx.beginPath(),ctx.fillStyle="white",par.radius>0&&ctx.arc(par.x,par.y,par.radius,0,2*Math.PI,!1),ctx.fill(),par.x+=par.vx,par.y+=par.vy,par.radius=Math.max(par.radius-.05,0)}function updateScore(){ctx.fillStlye="white",ctx.font="16px Arial, sans-serif",ctx.textAlign="left",ctx.textBaseline="top",ctx.fillText("Score: "+points,20,20)}function gameOver(){ctx.fillStlye="white",ctx.font="20px Arial, sans-serif",ctx.textAlign="center",ctx.textBaseline="middle",ctx.fillText("Game Over - You scored "+points+" points!",W/2,H/2+25),cancelRequestAnimFrame(init),over=1,restartBtn.draw()}function animloop(){init=requestAnimFrame(animloop),draw()}function startScreen(){draw(),startBtn.draw()}function btnClick(a){{var b=a.pageX;a.pageY}b>=startBtn.x&&b<=startBtn.x+startBtn.w&&(animloop(),startBtn={}),1==over&&b>=restartBtn.x&&b<=restartBtn.x+restartBtn.w&&(ball.x=20,ball.y=20,points=0,ball.vx=4,ball.vy=8,animloop(),over=0)}window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){return window.setTimeout(a,1e3/60)}}(),window.cancelRequestAnimFrame=function(){return window.cancelAnimationFrame||window.webkitCancelRequestAnimationFrame||window.mozCancelRequestAnimationFrame||window.oCancelRequestAnimationFrame||window.msCancelRequestAnimationFrame||clearTimeout}();var canvas=document.getElementById("canvas"),ctx=canvas.getContext("2d"),W=window.innerWidth,H=window.innerHeight/1.09,particles=[],ball={},paddles=[2],mouse={},points=0,fps=60,particlesCount=20,flag=0,particlePos={},multipler=1,startBtn={},restartBtn={},over=0,init,paddleHit;canvas.addEventListener("mousemove",trackPosition,!0),canvas.addEventListener("mousedown",btnClick,!0),collision=document.getElementById("collide"),canvas.width=W,canvas.height=H,paddles.push(new Paddle("bottom")),paddles.push(new Paddle("top")),ball={x:50,y:50,r:5,c:"white",vx:4,vy:8,draw:function(){ctx.beginPath(),ctx.fillStyle=this.c,ctx.arc(this.x,this.y,this.r,0,2*Math.PI,!1),ctx.fill()}},startBtn={w:100,h:50,x:W/2-50,y:H/2-25,draw:function(){ctx.strokeStyle="white",ctx.lineWidth="2",ctx.strokeRect(this.x,this.y,this.w,this.h),ctx.font="18px Arial, sans-serif",ctx.textAlign="center",ctx.textBaseline="middle",ctx.fillStlye="white",ctx.fillText("Start",W/2,H/2)}},restartB
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