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              <link href='//fonts.googleapis.com/css?family=Signika+Negative:300,400,700' rel='stylesheet' type='text/css'>
<div id="demo">
<div id="controls">
	<form id="form">
        <li style="padding-left:16px;">
            Engine:
            <select id="engine" size="1">
                <option value="popmotion">Popmotion (JS)</option>
                <option value="gsap">GSAP (JS)</option>
                <option value="webanimations">Web Animations (JS)</option>
            </select>
        </li>
        <li>
            Properties:
            <select id="properties" size="1">
              <option value="transforms">transform:translate(...) scale(...)</option>
            </select>
        </li>
    	  <li>
            Dots:
            <select id="dotQuantity" size="1">
                <option value="25">25</option>
                <option value="50">50</option>
                <option value="100">100</option>
                <option value="200">200</option>
                <option value="300">300</option>
                <option value="400">400</option>
                <option value="500" selected="selected">500</option>
                <option value="750">750</option>
                <option value="1000">1000</option>
                <option value="1250">1250</option>
                <option value="1500">1500</option>
                <option value="2000">2000</option>
                <option value="2500">2500</option>
                <option value="3000">3000</option>
            </select>
        </li>
        <li><div id="start">START</div></li>
    </form>
</div>
<div id="field">
  <div id="instructions"><h1>GSAP vs Popmotion Animation Speed Test</h1>
    <p>Forked from GreenSock's <a href="https://codepen.io/GreenSock/pen/srfxA">HTML5 Animation Speed Test</a></p>
    <p>Compare the animation performance of GSAP vs Popmotion 6.0 vs Web Animations.</p>
  </div>
</div>
</div>

            
          
!
            
              body {
  background-color: black;
  margin:0;
  padding:0;
  color:#eee;
  font-family: Signika Negative, sans-serif;
  font-weight: 300;
  font-size: 1.15em;
  user-select:none;
  -webkit-user-select:none;
}
html, body {
  height: 100%;
  overflow:hidden;
}
h1 {
  font-weight: 400;
  font-size:2em;
  line-height:1em;
  margin-bottom:0.1em;
  color: white;
}
a, a:hover, a:visited {
  color:#71B200;
}
#controls {
  display:table-row;
  background-color:#555;
  background: linear-gradient(to bottom,  #777 0%,#444 100%);
  padding:10px 10px 10px 5px;
  z-index:1000;
}
#controls form li {
  display:table-cell;
  padding:12px 6px 10px 6px;
  vertical-align:middle;
  text-shadow: 1px 1px 1px #000;
}
#instructions {
  width:82%;
  margin-left:8%;
  padding-top:1em;
  line-height: 1.5em;
  color:#ccc;
  pointer-events: auto;
}
#demo {
  display:table;
  width:100%;
  height:100%;
}
#field {
  position:relative;
  display:table-cell;
  width:100%;
  height: 100%;
  overflow:hidden;
  z-index:-100;
  border-top: 1px solid #777;
  pointer-events:none;
}
#start {
  color: black;
  border-radius: 6px;
  padding: 5px 18px;
  border: 2px solid black;
  background: #9af600;
  background: linear-gradient(to bottom,  #9af600 0%,#71B200 100%);
  cursor: pointer;
  text-shadow: none;
  font-weight: 400;
}
            
          
!
            
              var $start = $("#start"),
    $dotQtyInput = $("#dotQuantity"),
    $engineInput = $("#engine"),
    $propertiesInput = $("#properties"),
    $instructions = $("#instructions"),
    $field = $("#field"),
    $window = $(window),
    $inputs = $("select"),
    inProgress = false,
    tests = {},
    duration, radius, centerX, centerY, dots, rawDots, currentTest,  startingCSS;

/**
 * The goal of this test is to compare how various animation engines perform under pressure, taking relatively common
 * animation tasks and running a lot of them at once to see raw performance. The goal is NOT to figure out the most
 * efficient way to move dots in a starfield pattern.
 *
 * The same code drives everything except the actual tweens themselves. Every test in the "tests"
 * object has 4 properties:
 *
 * 		- milliseconds [boolean] - true if the duration should be defined in milliseconds
 *
 * 		- wrapDot [function] - when each dot <img> is created, it is passed to the wrapDot() method
 * 							   and whatever is returned gets stored in the array of dots to tween. This
 * 							   is useful to improve performance of things like jQuery because
 * 							   instead of passing the dom element to the tween() method (which would require
 * 							   jQuery to then query the dom and wrap the element in an engine-specific object
 * 							   before calling animate() on it), a native object can be used. Basically it lets you
 * 							   cache the dot's wrapper for better performance.
 *
 * 		- tween [function] - This is the core of the whole test. tween() is called for each dot, and the dot is
 * 							 passed as a parameter. The tween() function should set the dot's cssText to the
 * 							 startingCSS value (which just places the dot in the middle of the screen and sets its
 * 							 width/height to 1px) and then after a random delay between 0 and the duration of the tween,
 * 							 it should tween the dot at a random angle, altering either the left/top values or transform
 * 							 translate() values accordingly, and adjust the size to 32px wide/tall using either 
 * 							 width/height or transform:scale(). Then, after the tween is done, it should call the tween()
 * 							 method again for that dot. So the same dot will just continuously tween outward from the
 * 							 center at random angles and at random delay values.
 *
 * 		- stop [function] - This function is called when the user stops the test. The dot is passed as a parameter.
 * 							The function should immediately stop/kill the tween(s) of that dot (or all dots - that's fine too).
 *
 *  - nativeSize [Boolean] - true if the beginning width/height of the image should be its native size
 *                          (typically necessary for transforms, but not when we're animating width/height).
 *
 * I don't claim to be an expert at the various other animation engines out there, so if there are optimizations
 * that could be made to make them run better, please let me know. I tried to keep things as fair as possible.
 **/
var scaleRange = [0.06, 2];
tests.popmotion_transforms = {
  milliseconds:true,
  wrapDot: function (dot) {
    return popmotion.css(dot);
  },
  tween: function (dot) {
   // This function is overly-optimised for day-to-day
   // use - we're not usually animating 1000s of divs!
    
    var angle = Math.random() * Math.PI * 2;
    var mapScaleToX = popmotion.transform.interpolate(scaleRange, [0, Math.cos(angle) * radius]);
    var mapScaleToY = popmotion.transform.interpolate(scaleRange, [0, Math.sin(angle) * radius]);

    // Maintain mutable state to reduce jank - usually we
    // would just call `set` with a new object
    var dotStyles = {
      x: 0,
      y: 0,
      scale: 0
    };
    
    function updateDotStyles(v) {
      dotStyles.x = mapScaleToX(v);
      dotStyles.y = mapScaleToY(v);
      dotStyles.scale = v;
      dot.set(dotStyles);
    }
    
    updateDotStyles(scaleRange[0]);
    
    dot._animation = popmotion.chain([
      popmotion.delay(Math.random() * duration),
      popmotion.tween({
        from: scaleRange[0],
        to: scaleRange[1],
        duration: duration,
        ease: popmotion.easing.easeIn,
        onUpdate: updateDotStyles,
        onComplete: () => tests.popmotion_transforms.tween(dot)
      })
    ]).start();
  },
  stop: function (dot) {
    dot._animation.stop();
  },
  nativeSize: true
};

//GSAP transforms (translate()/scale())
tests.gsap_transforms = {
  milliseconds:false,
  wrapDot:function(dot) {
    return dot; //no wrapping necessary
  },
  tween:function(dot) {
    var angle = Math.random() * Math.PI * 2;
    TweenLite.set(dot, {css:{x:0, y:0, scale:0.06, force3D:true}, overwrite:"none"});
    TweenLite.to(dot, duration, {css:{x:(Math.cos(angle) * radius),
                                      y:(Math.sin(angle) * radius),
                                      scaleX:2,
                                      scaleY:2},
                                 delay:Math.random() * duration,
                                 ease:Cubic.easeIn,
                                 overwrite:"none",
                                 onComplete:tests.gsap_transforms.tween,
                                 onCompleteParams:[dot]});
  },
  stop:function(dot) {
    TweenLite.killTweensOf(dot);
  },
  nativeSize:true
};

//Web Animations (transforms)
tests.webanimations_transforms = {
	milliseconds:true,
	wrapDot:function(dot) {
		return dot; //no wrapping necessary
	},
	tween:function(dot) {
		dot.style.cssText = startingCSS + " transform: scale(0.06); -webkit-transform: scale(0.06);";
		var angle = Math.random() * Math.PI * 2,
			delay = Math.random() * duration,
			anim = dot.anim = dot.animate([{transform:"translate(0px, 0px) scale(0.06)"}, {
					transform:"translate(" + (Math.cos(angle) * radius) + "px, " + (Math.sin(angle) * radius) + "px) scale(2)"
				}], {duration: duration, delay: delay, fill:"forwards", easing:"cubic-bezier(0.550, 0.055, 0.675, 0.190)"});
		anim.onfinish = function() {
			tests.webanimations_transforms.tween(dot);
		};
	},
	stop:function(dot) {
		dot.anim.onfinish = null; //otherwise it'll call the onfinish when cancelled, and the loop will continue.
		dot.anim.cancel();
	},
	nativeSize:true
};

function toggleTest() {
  var i, size;
  inProgress = !inProgress;
  if (inProgress) {
    $inputs.prop("disabled", true);
    $field.css({pointerEvents:"none"}); //improve performance - ignore pointer events during animation
    $start.html(" STOP ");
    $start.css({background:"#C00"});
    TweenLite.to($instructions, 0.7, {autoAlpha:0, overwrite:"all"});
    currentTest = tests[$engineInput.val() + "_" + $propertiesInput.val()];
    size = (currentTest.nativeSize ? "16px" : "1px");
    centerX = $field.width() / 2;
    centerY = $field.height() / 2;
    startingCSS = "position:absolute; left:" + centerX + "px; top:" + centerY + "px; width:" + size + "; height:" + size + ";";
    radius = Math.sqrt(centerX * centerX + centerY * centerY);
    duration = currentTest.milliseconds ? 750 : 0.75;
    //we wait a millisecond before creating the dots and starting to animate them so that the UI renders first (making the "start" button say "stop"), otherwise users could be confused when there's a long pause when you choose Zepto and transforms due to the fact that it can take a while for the browser to put all the dots on their own layers.
    setTimeout(function() {
      createDots();
      i = dots.length;
      while (--i > -1) {
        currentTest.tween(dots[i]);
      }
    }, 1);
    
  } else {
    $start.html(" START ");
    $start.css({backgroundColor:"#9af600", background: "linear-gradient(to bottom, #9af600 0%,#71B200 100%"});
    TweenLite.to($instructions, 0.7, {autoAlpha:1, delay:0.2});
    $inputs.prop("disabled", false);
    calibrateInputs();
    $field.css({pointerEvents:"auto"});
    //stop the tweens and remove the dots.
    i = dots.length;
    while (--i > -1) {
      currentTest.stop(dots[i]);
      $field[0].removeChild(rawDots[i]); //removes dot(s)
    }
    dots = null;
    rawDots = null;
  }
}

function createDots() {
  var i = parseInt($dotQtyInput.val()),
      dot;
  dots = [];
  rawDots = [];
  while (--i > -1) {
    dot = document.createElement("img");
    dot.src = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/dot.png";
    dot.width = 1;
    dot.height = 1;
    dot.id = "dot" + i;
    dot.style.cssText = startingCSS;
    $field[0].appendChild(dot);
    rawDots.push(dot);
    dots.push(currentTest.wrapDot(dot));
  }
}

function calibrateInputs(e) {
  if ($engineInput.val() === "jquery") { //jQuery cannot animate transforms without a 3rd party plugin, so disable that option
    $propertiesInput[0].selectedIndex = 0;
    $propertiesInput.prop("disabled", true);
  } else {
    $propertiesInput.prop("disabled", false);
  }
}

$start.click(toggleTest);
$inputs.change(calibrateInputs);
            
          
!
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