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gameofqr
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Luca 2023-09-03 01:08:57 +02:00
commit c448e925f2
3 changed files with 98 additions and 0 deletions
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Game of QR</title>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
const canvas = document.getElementById('canvas');
function get(data, x, y) {
if (x < 0) x = data.width + x;
if (y < 0) y = data.height + y;
if (x >= data.width) x %= data.width;
if (y >= data.height) y %= data.height;
return data.data[y * data.width * 4 + x * 4] === 0 ? 1 : 0;
}
class GameOfQR {
init(src) {
if (this.interval) {
clearInterval(this.interval);
}
canvas.width = src.width * 16;
canvas.height = src.height * 16;
const tmp = new OffscreenCanvas(src.width, src.height);
const tmpCtx = tmp.getContext('2d');
tmpCtx.drawImage(src, 0, 0);
this.data = tmpCtx.getImageData(0, 0, tmp.width, tmp.height);
this.ctx = canvas.getContext('2d');
this.ctx.imageSmoothingEnabled = false;
this.ctx.drawImage(tmp, 0, 0, src.width, src.height, 0, 0, canvas.width, canvas.height);
setTimeout(() => {
setInterval(() => {
this.step();
}, 100);
}, 5000);
}
step() {
const prev = this.ctx.createImageData(this.data);
for (let i = 0; i < this.data.data.length; ++i) {
prev.data[i] = this.data.data[i];
}
for (let i = 0; i < this.data.height; ++i) {
for (let j = 0; j < this.data.width; ++j) {
const liveNeighbors = [
[ 1, 0],
[ 1, -1],
[ 0, -1],
[-1, -1],
[-1, 0],
[-1, 1],
[ 0, 1],
[ 1, 1]
].reduce((acc, [dx, dy]) => acc + get(prev, j+dx, i+dy), 0);
const k = i * this.data.width * 4 + j * 4;
const state = liveNeighbors > 3 || liveNeighbors < 2 ? 0 : liveNeighbors === 3 ? 1 : prev.data[k] === 0 ? 1 : 0;
this.data.data[k ] = (1-state) * 255;
this.data.data[k+1] = (1-state) * 255;
this.data.data[k+2] = (1-state) * 255;
this.data.data[k+3] = 255;
}
}
const tmp = new OffscreenCanvas(this.data.width, this.data.height);
const tmpCtx = tmp.getContext('2d');
tmpCtx.putImageData(this.data, 0, 0);
this.ctx.drawImage(tmp, 0, 0, this.data.width, this.data.height, 0, 0, canvas.width, canvas.height);
}
}
const app = new GameOfQR();
function hashchange() {
if (window.location.hash) {
const src = document.createElement('img');
src.src = window.location.hash.substring(1);
src.decode().then(() => {
app.init(src);
});
}
}
window.addEventListener('hashchange', hashchange);
hashchange();
</script>
</body>
</html>

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