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pong.html
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pong.html
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<!--A Pong clone craeated in canvas
--Author: Siddhant Majumder
--
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Pong</title>
<style>
*{padding: 0; margin: 0}
canvas{background: #eee;display: block;margin: 0 auto;}
</style>
</head>
<body>
<canvas id="myCanvas" width="480" height="320"></canvas>
<script>
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var x = canvas.width/2;
var y = canvas.height/2;
var ballRadius = 5;
var dx = 4;
var dy = -4;
var paddleHeight = 10;
var paddleWidth = 75;
var paddleX = (canvas.width - paddleWidth)/2;
var cpuX = (canvas.width - paddleWidth) / 2;
var pScore = 0;
var cScore = 0;
var k=1;//Lower Cpu speed to give player chance to score
function drawBall(){
ctx.beginPath();
ctx.arc(x,y,ballRadius,0,Math.PI*2,false);
ctx.fillStyle = "green";
ctx.fill();
ctx.closePath();
}
function drawPlayer(){
ctx.beginPath();
ctx.rect(paddleX,canvas.height-paddleHeight,paddleWidth,paddleHeight);
ctx.fillStyle = "blue";
ctx.fill();
ctx.closePath();
}
function drawPScore(){
ctx.font = "16px Cursive";
ctx.fillStyle = "darkblue";
ctx.fillText("P: "+pScore,450,canvas.height - paddleHeight - 10);
}
function drawCScore(){
ctx.font = "16px Cursive";
ctx.fillStyle = "red";
ctx.fillText("C: "+cScore,20,20+paddleHeight);
}
function drawCPU(){
ctx.beginPath();
ctx.rect(cpuX,0,paddleWidth,paddleHeight);
ctx.fillStyle = "red";
ctx.fill();
ctx.closePath();
}
function getSpeed(min,max){
return Math.random() * (max - min) + min;
}
function moveCpu(){
if(cpuX < x - ballRadius){
cpuX+=getSpeed(2.7,4.3);
}
if(cpuX > x - ballRadius){
if(k%6==0){
cpuX -= getSpeed(2.5,3.0);
}
else{
cpuX -= 4.3;
}
if (k == 90) {
k = 1;
}
}
}
function collisionDetection(){
if(x +dx + ballRadius > canvas.width || x + dx - ballRadius < 0 ){
dx=-dx;
k++;
}
if(x + dx >= cpuX && x + dx<=cpuX + paddleWidth && y+dy - ballRadius <= paddleHeight){
dy=-dy;
}
if(x+dx >= paddleX && x+dx<=paddleX + paddleWidth && y+dy + ballRadius == canvas.height - paddleHeight){
dy=-dy;
}
if(y+dy - ballRadius<= paddleHeight){
if(x + dx >=cpuX && x + dx <= cpuX){
dy = -dy;
}
else{
pScore++;
x = canvas.width / 2;
y = canvas.height/2;;
dy = -dy;
}
}
if(y + dy + ballRadius > canvas.height - paddleHeight){
if(x + dx >= paddleX && x + dx <= paddleX + paddleWidth){
dy = -dy;
}
else{
cScore++;
x = canvas.width / 2;
y = canvas.height /2;
dy = -dy;
}
}
}
function checkGame(){
if(cScore == 10){
alert("You loose!");
document.location.reload();
cScore =0;
pScore =0;
}
if(pScore == 10){
alert("You Win.Congratulations!!");
document.location.reload();
cScore = 0;
pScore = 0;
}
}
function draw(){
ctx.clearRect(0,0,canvas.width,canvas.height);
drawCPU();
drawPlayer();
drawBall();
drawPScore();
drawCScore();
checkGame();
moveCpu();
collisionDetection();
x += dx;
y += dy;
requestAnimationFrame(draw);
}
draw();
document.addEventListener("mousemove",mouseMoveHandler,false);
function mouseMoveHandler(e){
var relativeX = e.clientX - canvas.offsetLeft;
if(relativeX>0 && relativeX<canvas.width)
{
paddleX = relativeX - paddleWidth;
}
}
</script>
</body>
</html>