qr.js

function byid(id) {
	return document.getElementById(id);
}
function valof(id) {
	return byid(id).checked ? 1 : 0;
}
function text(e) {
	if (e == null) {
		return "";
	}
	var s = e.value;
	return s;
}
 
var lastQ = null
var ticking = false
var ticksSinceChange = 0
 
function update() {
	var q = theImage();
//	byid("xxx").innerHTML = "<img src=\"" + q + "\" />"
//	alert(q)
//	return;

	var req = new XMLHttpRequest()
	req.onreadystatechange = function() {
		if(req.readyState == 4 && req.status == 200) {
			byid("output").innerHTML = req.responseText
		//	if(history && history.replaceState)
		//		history.replaceState(null, null, "?q=" + encodeURIComponent(q))
		}
	}
	req.open("GET", q, true)
	req.send(null)
	
	_gaq.push(['_trackEvent', 'QR', 'Generate', q])
}

function theImage() {
  const u = byid("url").value,
      i = img,
      c = valof("control"),
      r = valof("rand"),
      d = valof("data"),
      t = valof("dither"),
      s = Math.floor(Math.random()*1e9),
      o = rotation,
      x = dx
      y = dy;
  
  return "/qr/draw?" + Object.entries({i, u, m, x, y, v, c, r, d , r, s, z, o})
    .map(([key, value]) => [key, value].map(encodeURIComponent).join("=")).join("&");
  }
   
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-3319603-5']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();

var dx=4
var dy=4
var url="http://research.swtch.com/qart"
var m=2
var v=6
var z=0
var img="pjw"
var cheat=0
var rotation=0

function up() { dy++; update(); }
function down() { dy--; update(); }
function left() { dx++; update(); }
function right() { dx--; update(); }
function bigger() { if(v < 8) { v++; update(); } }
function smaller() { if(v > 1) { v--; update(); } }
function setimg(s) { img=s; update(); }
function togglemask() { if(m>=0) m=-1; else m=2; update(); }
function ibigger() { z++; update(); }
function ismaller() { z--; update(); }
function rotate() { rotation = (rotation+1) & 3; update(); }