Topic: If anyone wants it, here is the source code for "pong" in HTML5.

+Lalotax !IVGhnqIAoQ — 5.3 years ago #56,910

<!DOCTYPE html>
<html>
<head>
<title>Basic Pong HTML Game</title>
<meta charset="UTF-8">
<style>
html, body {
height: 100%;
margin: 0;
}

body {
background: black;
display: flex;
align-items: center;
justify-content: center;
}
</style>
</head>
<body>
<canvas width="750" height="585" id="game"></canvas>
<script>
const canvas = document.getElementById('game');
const context = canvas.getContext('2d');
const grid = 15;
const paddleHeight = grid * 5; // 80
const maxPaddleY = canvas.height - grid - paddleHeight;

var paddleSpeed = 6;
var ballSpeed = 5;

const leftPaddle = {
// start in the middle of the game on the left side
x: grid * 2,
y: canvas.height / 2 - paddleHeight / 2,
width: grid,
height: paddleHeight,

// paddle velocity
dy: 0
};
const rightPaddle = {
// start in the middle of the game on the right side
x: canvas.width - grid * 3,
y: canvas.height / 2 - paddleHeight / 2,
width: grid,
height: paddleHeight,

// paddle velocity
dy: 0
};
const ball = {
// start in the middle of the game
x: canvas.width / 2,
y: canvas.height / 2,
width: grid,
height: grid,

// keep track of when need to reset the ball position
resetting: false,

// ball velocity (start going to the top-right corner)
dx: ballSpeed,
dy: -ballSpeed
};

// check for collision between two objects using axis-aligned bounding box (AABB)
// @see https://developer.mozilla.org/en-US/docs/Games/Techniques/2D_collision_detection
function collides(obj1, obj2) {
return obj1.x < obj2.x + obj2.width &&
obj1.x + obj1.width > obj2.x &&
obj1.y < obj2.y + obj2.height &&
obj1.y + obj1.height > obj2.y;
}

// game loop
function loop() {
requestAnimationFrame(loop);
context.clearRect(0,0,canvas.width,canvas.height);

// move paddles by their velocity
leftPaddle.y += leftPaddle.dy;
rightPaddle.y += rightPaddle.dy;

// prevent paddles from going through walls
if (leftPaddle.y < grid) {
leftPaddle.y = grid;
}
else if (leftPaddle.y > maxPaddleY) {
leftPaddle.y = maxPaddleY;
}

if (rightPaddle.y < grid) {
rightPaddle.y = grid;
}
else if (rightPaddle.y > maxPaddleY) {
rightPaddle.y = maxPaddleY;
}

// draw paddles
context.fillStyle = 'white';
context.fillRect(leftPaddle.x, leftPaddle.y, leftPaddle.width, leftPaddle.height);
context.fillRect(rightPaddle.x, rightPaddle.y, rightPaddle.width, rightPaddle.height);

// move ball by its velocity
ball.x += ball.dx;
ball.y += ball.dy;

// prevent ball from going through walls by changing its velocity
if (ball.y < grid) {
ball.y = grid;
ball.dy *= -1;
}
else if (ball.y + grid > canvas.height - grid) {
ball.y = canvas.height - grid * 2;
ball.dy *= -1;
}

// reset ball if it goes past paddle (but only if we haven't already done so)
if ( (ball.x < 0 || ball.x > canvas.width) && !ball.resetting) {
ball.resetting = true;

// give some time for the player to recover before launching the ball again
setTimeout(() => {
ball.resetting = false;
ball.x = canvas.width / 2;
ball.y = canvas.height / 2;
}, 400);
}

// check to see if ball collides with paddle. if they do change x velocity
if (collides(ball, leftPaddle)) {
ball.dx *= -1;

// move ball next to the paddle otherwise the collision will happen again
// in the next frame
ball.x = leftPaddle.x + leftPaddle.width;
}
else if (collides(ball, rightPaddle)) {
ball.dx *= -1;

// move ball next to the paddle otherwise the collision will happen again
// in the next frame
ball.x = rightPaddle.x - ball.width;
}

// draw ball
context.fillRect(ball.x, ball.y, ball.width, ball.height);

// draw walls
context.fillStyle = 'lightgrey';
context.fillRect(0, 0, canvas.width, grid);
context.fillRect(0, canvas.height - grid, canvas.width, canvas.height);

// draw dotted line down the middle
for (let i = grid; i < canvas.height - grid; i += grid * 2) {
context.fillRect(canvas.width / 2 - grid / 2, i, grid, grid);
}
}

// listen to keyboard events to move the paddles
document.addEventListener('keydown', function(e) {

// up arrow key
if (e.which === 38) {
rightPaddle.dy = -paddleSpeed;
}
// down arrow key
else if (e.which === 40) {
rightPaddle.dy = paddleSpeed;
}

// w key
if (e.which === 87) {
leftPaddle.dy = -paddleSpeed;
}
// a key
else if (e.which === 83) {
leftPaddle.dy = paddleSpeed;
}
});

// listen to keyboard events to stop the paddle if key is released
document.addEventListener('keyup', function(e) {
if (e.which

= 38 || e.which

= 40) {
rightPaddle.dy = 0;
}

if (e.which

= 83 || e.which

= 87) {
leftPaddle.dy = 0;
}
});

// start the game
requestAnimationFrame(loop);
</script>
</body>
</html>

(Edited 6 minutes later.)

+Anonymous B — 5.3 years ago, 45 minutes later[T] [B] #594,695

delete system 32

+Anonymous C — 5.3 years ago, 22 minutes later, 1 hour after the original post[T] [B] #594,696

youarefag = true

·Lalotax !IVGhnqIAoQ (OP) — 5.3 years ago, 23 minutes later, 1 hour after the original post[T] [B] #594,698

@594,695 (B)
Im using mac

·Lalotax !IVGhnqIAoQ (OP) — 5.3 years ago, 28 seconds later, 1 hour after the original post[T] [B] #594,699

@594,696 (C)
You didn't even declare what programming language you are using. Python? Javascript? HTML???

·Anonymous C — 5.3 years ago, 1 hour later, 3 hours after the original post[T] [B] #594,703

@previous (Lalotax !IVGhnqIAoQ)
> You didn't even declare what programming language you are using. Python? Javascript? HTML???

Kill yourself

·Anonymous C — 5.3 years ago, 6 minutes later, 3 hours after the original post[T] [B] #594,704

Shoot a bullet through your mouth

·Lalotax !IVGhnqIAoQ (OP) — 5.3 years ago, 7 hours later, 11 hours after the original post[T] [B] #594,711

@594,703 (C)

not a programming language dude

·Lalotax !IVGhnqIAoQ (OP) — 5.3 years ago, 13 seconds later, 11 hours after the original post[T] [B] #594,712

@594,704 (C)
no

·Anonymous C — 5.3 years ago, 4 hours later, 15 hours after the original post[T] [B] #594,731

@594,711 (Lalotax !IVGhnqIAoQ)
> not a programming language dude

die

·Lalotax !IVGhnqIAoQ (OP) — 5.3 years ago, 26 minutes later, 15 hours after the original post[T] [B] #594,732

@previous (C)

I take it you cant program?

+Syntax — 5.3 years ago, 6 minutes later, 15 hours after the original post[T] [B] #594,733

@OP

·Lalotax !IVGhnqIAoQ (OP) — 5.3 years ago, 3 minutes later, 15 hours after the original post[T] [B] #594,734

@previous (Syntax)

HOP IN
WERE GOING TO FIND OUT WHO ASKED

+Syntax — 5.3 years ago, 3 minutes later, 15 hours after the original post[T] [B] #594,735

@594,733 (Syntax)

·Anonymous C — 5.3 years ago, 19 hours later, 1 day after the original post[T] [B] #594,789

@594,732 (Lalotax !IVGhnqIAoQ)
> I take it you cant program?
Shoot yourself

·Lalotax !IVGhnqIAoQ (OP) — 5.3 years ago, 6 minutes later, 1 day after the original post[T] [B] #594,790

@previous (C)

oh so you're an idiot thats desperately trying to act smarter than me, huh.

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