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Pong example.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Gamedev Canvas Workshop</title>
<style>
canvas {
background: black;
display: block;
margin: auto;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="1024" height="720"></canvas>
<script>
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var x = canvas.width / 2;
var y = canvas.height - 30;
var dx = 4;
var dy = -4;
var ballRadius = 10;
// left player paddle
var leftPaddleHeight = 90;
var leftPaddleWidth = 15;
var leftPaddleX = 5;
var leftPaddleY = canvas.height / 2 - leftPaddleHeight / 2;
// Right player paddle
var rightPaddleHeight = 90;
var rightPaddleWidth = 15;
var rightPaddleX = canvas.width - (rightPaddleWidth + 5);
var rightPaddleY = canvas.height / 2 - rightPaddleHeight / 2;
// boolean to handle pressed keys
var leftUpPressed = false;
var leftDownPressed = false;
var rightUpPressed = false;
var rightDownPressed = false;
var leftScore = 0;
var rightScore = 0;
function keyDownHandler(e) {
if (e.keyCode == 90) {
leftUpPressed = true;
} else if (e.keyCode == 83) {
leftDownPressed = true;
}
if (e.keyCode == 38) {
rightUpPressed = true;
} else if (e.keyCode == 40) {
rightDownPressed = true;
}
}
function keyUpHandler(e) {
if (e.keyCode == 90) {
leftUpPressed = false;
} else if (e.keyCode == 83) {
leftDownPressed = false;
}
if (e.keyCode == 38) {
rightUpPressed = false;
} else if (e.keyCode == 40) {
rightDownPressed = false;
}
}
function drawBall() {
ctx.beginPath();
ctx.arc(x, y, ballRadius, 0, Math.PI * 2);
ctx.fillStyle = "white";
ctx.fill();
ctx.closePath();
}
function drawScores() {
ctx.font = "80px Arial";
ctx.fillStyle = "white";
ctx.fillText(leftScore, (canvas.width / 2) - 80, 80);
ctx.fillText(rightScore, (canvas.width / 2) + 40, 80);
}
function collisionsWithLeftPaddle() {
if ((x - ballRadius) <= 5 + leftPaddleWidth) {
if (y > leftPaddleY && y < leftPaddleY + leftPaddleHeight)
dx = -dx;
else if ((x - ballRadius) <= 0) {
rightScore++;
//alert("Game Over");
x = canvas.width / 2;
y = canvas.height / 2;
dx = -dx;
dy = -dy;
// document.location.reload();
}
}
}
function collisionsWithRightPaddle() {
if ((x + ballRadius) >= canvas.width - (rightPaddleWidth + 5)) {
if (y > rightPaddleY && y < rightPaddleY + rightPaddleHeight)
dx = -dx;
else if (x + ballRadius >= canvas.width) {
leftScore++;
//alert("Game Over");
x = canvas.width / 2;
y = canvas.height / 2;
dx = -dx;
dy = -dy;
//document.location.reload();
}
}
}
function computeCollisionsWithWallsAndPaddle() {
collisionsWithLeftPaddle();
collisionsWithRightPaddle();
if (((y - ballRadius) <= 0) || ((y + ballRadius) >= canvas.height)) {
dy = -dy;
}
}
function drawLeftPaddle() {
ctx.beginPath();
ctx.rect(leftPaddleX, leftPaddleY, leftPaddleWidth, leftPaddleHeight);
ctx.fillStyle = "white";
ctx.fill();
ctx.closePath();
if (leftDownPressed && leftPaddleY < canvas.height - leftPaddleHeight) {
leftPaddleY += 7;
} else if (leftUpPressed && leftPaddleY > 0) {
leftPaddleY -= 7;
}
}
function drawRightPaddle() {
ctx.beginPath();
ctx.rect(rightPaddleX, rightPaddleY, rightPaddleWidth, rightPaddleHeight);
ctx.fillStyle = "white";
ctx.fill();
ctx.closePath();
if (rightDownPressed && rightPaddleY < canvas.height - rightPaddleHeight) {
rightPaddleY += 7;
} else if (rightUpPressed && rightPaddleY > 0) {
rightPaddleY -= 7;
}
}
function drawScene() {
ctx.beginPath();
ctx.rect(canvas.width / 2 - 1, 0, 3, canvas.height);
ctx.fillStyle = "white";
ctx.fill();
ctx.closePath();
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawScores();
drawScene();
drawLeftPaddle();
drawRightPaddle();
drawBall();
computeCollisionsWithWallsAndPaddle();
x += dx;
y += dy;
}
setInterval(draw, 10);
document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);
</script>
</body>
</html>