trying qrcode libraries for ubg

demos/stefan/webxr/qrcodegen.md

@@ -0,0 +1,29 @@
+
+<canvas id='canvasOutput' style='border: red 1px solid;'></canvas>
+
+<script>
+import qrgen from 'https://lively-kernel.org/lively4/aexpr/src/external/qrcodegen.js'
+  const get = id => lively.query(this, '#' + id)
+Object.getOwnPropertyNames(qrgen)
+const { QrCode } = qrgen
+QrCode
+var qr = QrCode.encodeText("1234", QrCode.Ecc.HIGH);
+
+
+	function drawCanvas(qr, scale, border, lightColor, darkColor, canvas) {
+		if (scale <= 0 || border < 0)
+			throw new RangeError("Value out of range");
+		const width = (qr.size + border * 2) * scale;
+		canvas.width = width;
+		canvas.height = width;
+		let ctx = canvas.getContext("2d");
+		for (let y = -border; y < qr.size + border; y++) {
+			for (let x = -border; x < qr.size + border; x++) {
+				ctx.fillStyle = qr.getModule(x, y) ? darkColor : lightColor;
+				ctx.fillRect((x + border) * scale, (y + border) * scale, scale, scale);
+			}
+		}
+	}
+
+drawCanvas(qr, 8, 1, "#FFFFFF", "#000000", get("canvasOutput"));
+</script>