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index.html
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Pong wars | Koen van Gilst</title>
<meta
name="description"
content="The eternal battle between day and night, good and bad. Written in JavaScript with some HTML & CSS in one index.html. Feel free to reuse the code and create your own version."
/>
<link rel="canonical" href="https://pong-wars.koenvangilst.nl/" />
<link rel="author" href="https://koenvangilst.nl" />
<meta name="theme-color" content="#172B36" />
<meta name="creator" content="Koen van Gilst" />
<script defer data-domain="pong-wars.koenvangilst.nl" src="https://plausible.koenvangilst.nl/js/script.js"></script>
<style>
html {
height: 100%;
}
body {
height: 100%;
margin: 0;
padding: 0;
display: flex;
justify-content: center;
align-items: center;
background: linear-gradient(to bottom, #172b36 0%, #d9e8e3 100%);
}
#container {
display: flex;
align-items: center;
flex-direction: column;
width: min(70vh, 80%);
max-width: 600px;
height: 100%;
}
canvas {
display: block;
border-radius: 4px;
overflow: hidden;
width: 100%;
margin-top: auto;
box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
}
#score {
font-family: monospace;
margin-top: 30px;
font-size: 16px;
padding-left: 20px;
color: #172b36;
}
#made {
text-align: center;
line-height: 1.5;
font-family: monospace;
margin-top: auto;
margin-bottom: 20px;
font-size: 10px;
}
#made a {
color: #172b36;
}
</style>
</head>
<body>
<div id="container">
<canvas id="pongCanvas" width="600" height="600"></canvas>
<div id="score"></div>
<p id="made">
made by
<a href="https://koenvangilst.nl/labs/pong-wars">Koen van Gilst</a> | source on
<a href="https://github.com/vnglst/pong-wars">github</a>
</p>
</div>
</body>
<script>
// Source palette: https://twitter.com/AlexCristache/status/1738610343499157872
// Idea for Pong wars: https://twitter.com/nicolasdnl/status/1749715070928433161
const colorPalette = {
ArcticPowder: "#F1F6F4",
MysticMint: "#D9E8E3",
Forsythia: "#FFC801",
DeepSaffron: "#FF9932",
NocturnalExpedition: "#114C5A",
OceanicNoir: "#172B36",
};
const canvas = document.getElementById("pongCanvas");
const ctx = canvas.getContext("2d");
const scoreElement = document.getElementById("score");
const DAY_COLOR = colorPalette.MysticMint;
const DAY_BALL_COLOR = colorPalette.NocturnalExpedition;
const NIGHT_COLOR = colorPalette.NocturnalExpedition;
const NIGHT_BALL_COLOR = colorPalette.MysticMint;
const SQUARE_SIZE = 25;
const MIN_SPEED = 5;
const MAX_SPEED = 10;
const numSquaresX = canvas.width / SQUARE_SIZE;
const numSquaresY = canvas.height / SQUARE_SIZE;
let dayScore = 0;
let nightScore = 0;
const squares = [];
// Populate the fields, one half day, one half night
for (let i = 0; i < numSquaresX; i++) {
squares[i] = [];
for (let j = 0; j < numSquaresY; j++) {
squares[i][j] = i < numSquaresX / 2 ? DAY_COLOR : NIGHT_COLOR;
}
}
const balls = [
{
x: canvas.width / 4,
y: canvas.height / 2,
dx: 8,
dy: -8,
reverseColor: DAY_COLOR,
ballColor: DAY_BALL_COLOR,
},
{
x: (canvas.width / 4) * 3,
y: canvas.height / 2,
dx: -8,
dy: 8,
reverseColor: NIGHT_COLOR,
ballColor: NIGHT_BALL_COLOR,
},
];
let iteration = 0;
function drawBall(ball) {
ctx.beginPath();
ctx.arc(ball.x, ball.y, SQUARE_SIZE / 2, 0, Math.PI * 2, false);
ctx.fillStyle = ball.ballColor;
ctx.fill();
ctx.closePath();
}
function drawSquares() {
dayScore = 0;
nightScore = 0;
for (let i = 0; i < numSquaresX; i++) {
for (let j = 0; j < numSquaresY; j++) {
ctx.fillStyle = squares[i][j];
ctx.fillRect(i * SQUARE_SIZE, j * SQUARE_SIZE, SQUARE_SIZE, SQUARE_SIZE);
// Update scores
if (squares[i][j] === DAY_COLOR) dayScore++;
if (squares[i][j] === NIGHT_COLOR) nightScore++;
}
}
}
function checkSquareCollision(ball) {
// Check multiple points around the ball's circumference
for (let angle = 0; angle < Math.PI * 2; angle += Math.PI / 4) {
const checkX = ball.x + Math.cos(angle) * (SQUARE_SIZE / 2);
const checkY = ball.y + Math.sin(angle) * (SQUARE_SIZE / 2);
const i = Math.floor(checkX / SQUARE_SIZE);
const j = Math.floor(checkY / SQUARE_SIZE);
if (i >= 0 && i < numSquaresX && j >= 0 && j < numSquaresY) {
if (squares[i][j] !== ball.reverseColor) {
// Square hit! Update square color
squares[i][j] = ball.reverseColor;
// Determine bounce direction based on the angle
if (Math.abs(Math.cos(angle)) > Math.abs(Math.sin(angle))) {
ball.dx = -ball.dx;
} else {
ball.dy = -ball.dy;
}
}
}
}
}
function checkBoundaryCollision(ball) {
if (ball.x + ball.dx > canvas.width - SQUARE_SIZE / 2 || ball.x + ball.dx < SQUARE_SIZE / 2) {
ball.dx = -ball.dx;
}
if (ball.y + ball.dy > canvas.height - SQUARE_SIZE / 2 || ball.y + ball.dy < SQUARE_SIZE / 2) {
ball.dy = -ball.dy;
}
}
function addRandomness(ball) {
ball.dx += Math.random() * 0.01 - 0.005;
ball.dy += Math.random() * 0.01 - 0.005;
// Limit the speed of the ball
ball.dx = Math.min(Math.max(ball.dx, -MAX_SPEED), MAX_SPEED);
ball.dy = Math.min(Math.max(ball.dy, -MAX_SPEED), MAX_SPEED);
// Make sure the ball always maintains a minimum speed
if (Math.abs(ball.dx) < MIN_SPEED) ball.dx = ball.dx > 0 ? MIN_SPEED : -MIN_SPEED;
if (Math.abs(ball.dy) < MIN_SPEED) ball.dy = ball.dy > 0 ? MIN_SPEED : -MIN_SPEED;
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawSquares();
scoreElement.textContent = `day ${dayScore} | night ${nightScore}`;
balls.forEach((ball) => {
drawBall(ball);
checkSquareCollision(ball);
checkBoundaryCollision(ball);
ball.x += ball.dx;
ball.y += ball.dy;
addRandomness(ball);
});
iteration++;
if (iteration % 1_000 === 0) console.log("iteration", iteration);
requestAnimationFrame(draw);
}
requestAnimationFrame(draw);
</script>
</html>