Initial commit

2023-09-03 01:08:57 +02:00 · 2023-09-03 01:08:57 +02:00 · c448e925f2
commit c448e925f2
3 changed files with 98 additions and 0 deletions
--- a/glider.png
+++ b/glider.png
--- a/index.html
+++ b/index.html
@ -0,0 +1,98 @@
+<!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>
--- a/qrcode.png
+++ b/qrcode.png