window.onload=function(){ var c; var canvas = document.querySelector("canvas"); c=document.querySelector("canvas"); c.width=innerWidth; c.height=innerHeight; c=c.getContext("2d"); var ballX=innerWidth/2; //x axis start postition var ballY=innerHeight/2;//y axis start postition var ballRadius=4; var dx=1; //x velocity var dy=1; //y velocity var paddle1X=1, paddle1Y=innerHeight/2, paddle1WIDTH=5, paddle1HEIGHT=70; var paddle2X=innerWidth-6, paddle2Y=innerHeight/2, paddle2WIDTH=5, paddle2HEIGHT=70; var score1=0; var score2=0; var AI=0; // AI= 0 for multiplayer //mousemove eventListener controls window.addEventListener("mousemove",function(event) { if (dx < 0) { paddle1Y = event.clientY-paddle1HEIGHT/2; event.preventDefault(); } else { paddle2Y = event.clientY-paddle2HEIGHT/2; event.preventDefault(); } }); //touchmove eventListener controls canvas.addEventListener('touchmove', function(e){ var rect = canvas.getBoundingClientRect(); var root = document.documentElement; var touch = e.changedTouches[0]; var touchY = parseInt(touch.clientY) - rect.top - root.scrollTop ; e.preventDefault(); if (dx < 0) { paddle1Y = touchY - paddle1HEIGHT/2; } else { paddle2Y = touchY - paddle2HEIGHT/2; } }); //keyboard controls function dealWithKeyboard(e) { if (e.keyCode == "81") { //q paddle1Y-=2; } else if (e.keyCode == "65"){ //a paddle1Y+=2; } if (e.keyCode == "38") { //arrow up paddle2Y-=2; } else if (e.keyCode == "40"){ //arrow down paddle2Y+=2; } } //game reset function reset(){ //reset game == center ball ballX=innerWidth/2; //center ballY=innerHeight/2; //center dx = 1; //reset speed dy = 1; //reset speed //AI = 1; //reset AI } //CORE ANIMATE FUNCTION function animate(){ requestAnimationFrame(animate); c.clearRect(0,0,innerWidth,innerHeight); // x, y, innerWidth, innerHeight //clears canvas c.beginPath(); //begin //canvas arc circle == ball c.arc(ballX, ballY, ballRadius, 0, Math.PI*2, false); //c.arc(x,y,r,startAngle,endAngle, drawCounterClockwise) c.fill(); //fill inside c.stroke();//stroke edges //canvas paddle1 == player 1 paddle c.beginPath(); //begin c.fillRect(paddle1X,paddle1Y,paddle1WIDTH,paddle1HEIGHT); //x,y,width,height //canvas paddle2 == player 2 paddle c.beginPath(); //begin c.fillRect(paddle2X,paddle2Y,paddle2WIDTH,paddle2HEIGHT); //x,y,width,height //score text for player 1 and player 2 c.fillText(score1, 100, 20); //score 1 c.fillText(score2, innerWidth-100, 20); //score 2 //game colors + random choice of color var gameColors=['red', 'green', 'blue', 'black', 'brown', '#741a1a', '#121f1f']; var randomColor = gameColors[Math.floor(Math.random() * gameColors.length)]; //index random color //IF BALL TOUCHES RIGHT PADDLE THEN BOUNCE BACK function paddle2Bounce(){ if (ballX+ballRadius > innerWidth){ if (ballY >= paddle2Y && ballY <= paddle2Y + paddle2HEIGHT) { dx = -dx-0.3; //bounce/reverse ball back + make it faster 0.3 //dy = dy-0.1; //AI = AI-0.3; //make AI faster c.fillStyle = randomColor; //c.fillStyle = "#"+Math.random().toString(16).slice(-6); //get random color } else{ score1++; reset(); } } } // END OF RIGHT PADDLE BOUNCE //IF BALL TOUCHES LEFT PADDLE THEN BOUNCE BACK function paddle1Bounce(){ if (ballX-ballRadius < 0){ if (ballY >= paddle1Y && ballY <= paddle1Y + paddle1HEIGHT) { dx = -dx+0.3; //bounce/reverse ball back + make it faster 0.3 //dy = dy+0.1; c.fillStyle = randomColor; //c.fillStyle = "#"+Math.random().toString(16).slice(-6); //get random color } else{ score2++; reset(); } } } //END OF LEFT PADDLE BOUNCE //BOUNCE BALL IF IT TOUCHES TOP OR BOTTOM OF THE SCREEN function topBottomBounce(){ if(ballY+ballRadius > innerHeight || ballY-ballRadius < 0){ dy = -dy; //bounce/reverse ball //c.fillStyle = randomColor; //c.fillStyle = "#"+Math.random().toString(16).slice(-6); //get random color } } //IF PADDLE IS ABOVE OR BELOW CANVAS - GET IT BACK TO CANVAS function stayInCanvas(){ if(paddle1Y+paddle1HEIGHT > innerHeight){ paddle1Y=innerHeight-paddle1HEIGHT; } if(paddle1Y < 0){ paddle1Y=0; } if(paddle2Y+paddle2HEIGHT > innerHeight){ paddle2Y=innerHeight-paddle2HEIGHT; } if(paddle2Y < 0){ paddle2Y=0; } } //AI player function AIPlayer(){ if(paddle2Y+paddle2HEIGHT/2 < ballY){ paddle2Y+=AI; } else{paddle2Y-=AI;} } //move my ball in x and y axis function moveBallXandYaxis(){ ballX+=dx; //run ball in x axis ballY+=dy; //run ball in y axis } /* >>>>>>>>>>CALLING FUNCTIONS<<<<<<<<<< */ moveBallXandYaxis(); //moving ball in x and y axis paddle1Bounce(); //bounce/reverse ball from paddle1 paddle2Bounce(); //bounce/reverse ball from paddle2 topBottomBounce(); //top and bottom bouncing/reversing ball stayInCanvas(); //paddle1 Y axis can be only in canvas.height AIPlayer(); //init AI player } //end of animate(); function animate(); //init animate(); function }; //end of onload function

Ping Pong