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GSAP always had the tried-and-true "bounce" ease, but there was no way to customize how "bouncy" it was, nor could you get a synchronized squash and stretch effect during the bounce because: The "bounce" ease needs to stick to the ground momentarily at the point of the bounce while the squashing occurs. Bounce.easeOut offers no such customization. There was no way to create the corresponding [synchronized] scaleX/scaleY ease for the squashing/stretching. CustomEase solves this now, but it'd still be very difficult to manually draw that ease with all the points lined up in the right spots to match up with the bounces. With CustomBounce, you can set a few parameters and it'll create BOTH CustomEases for you (one for the bounce, and one [optionally] for the squash/stretch). Think of CustomBounce like a wrapper that creates a CustomEase under the hood based on the variables you pass in. Note that this video uses GSAP 2's format. Options strength (Number) - A number between 0 and 1 that determines how "bouncy" the ease is, so 0.9 will have a lot more bounces than 0.3. Default: 0.7 endAtStart (Boolean) - If true, the ease will end back where it started, allowing you to get an effect like an object sitting on the ground, leaping into the air, and bouncing back down to a stop. Default: false squash (Number) - Controls how long the squash should last (the gap between bounces, when it appears "stuck"). Typically 2 is a good number, but 4 (as an example) would make the squash longer in relation to the rest of the ease. Default: 0 squashID (String) - The ID that should be assigned to the squash ease. The default is whatever the ID of the bounce is plus "-squash" appended to the end. For example, CustomBounce.create("hop", {strength:0.6, squash:2}) would default to a squash ease ID of "hop-squash". How do you get the bounce and the squash/stretch to work together? You'd use two tweens; one for the position ("y"), and the other for the scaleX/scaleY, with both running at the same time: //Create a custom bounce ease: CustomBounce.create("myBounce", {strength:0.6, squash:3, squashID:"myBounce-squash"}); //do the bounce by affecting the "y" property. gsap.from(".class", {duration: 2, y:-200, ease:"myBounce"}); //and do the squash/stretch at the same time: gsap.to(".class", {duration: 2, scaleX:140, scaleY:60, ease:"myBounce-squash", transformOrigin:"center bottom"}); How to get CustomBounce CustomBounce is a membership benefit of Club GreenSock. Once you're a member, you can simply log in and download it from your Account Dashboard anytime, or use our private NPM repository. See the install page for details. Also note that CustomBounce requires CustomEase. Demos 
 CustomBounce Demos

Note: This page was created for GSAP version 2. We have since released GSAP 3 with many improvements. This includes replacing accessing _gsTransform with gsap.getProperty(). Please see the GSAP 3 release notes for details. Have you ever wondered how to get the position, rotation or other transform-related properties that were animated with GSAP? It's actually quite simple: they're all neatly organized and updated in the _gsTransform object which GSAP attaches directly to the target element! Watch the video Let's set the rotation of the logo to 20 degrees. var logo = document.querySelector("#logo"); TweenMax.set(logo, {rotation:20}); GSAP applies that rotation via an inline style using a transform matrix (2d or 3d). If you were to inspect the element after the rotation was set you would see: <img style="transform: matrix(0.93969, 0.34202, -0.34202, 0.93969, 0, 0);" id="logo" src="..." > Not many humans would be able to discern the rotation from those values. Don't worry - the _gsTransform object has all the discrete values in human-readable form! console.log(logo._gsTransform); The console will show you an Object with the following properties and values: Object { force3D: "auto", perspective: 0, rotation: 20, rotationX: 0, rotationY: 0, scaleX: 1, scaleY: 1, scaleZ: 1, skewType: "compensated", skewX: 0, skewY: 0, svg: false, x: 0, xOffset: 0, xPercent: 0, y: 0, yOffset: 0, yPercent: 0, z: 0, zOrigin: 0 } To grab the rotation of the logo you would simply use: logo._gsTransform.rotation Click "Edit on CodePen" and open the console to see how it works See the Pen _gsTransform demo by GreenSock (@GreenSock) on CodePen. Get transform values during an animation Use an onUpdate callback to read the values during an animation: var logo = document.querySelector("#logo"); var output = document.querySelector("#output"); TweenMax.to(logo, 4, {rotationY:360, x:600, transformPerspective:800, transformOrigin:"50% 50%", onUpdate:showValues, ease:Linear.easeNone}); function showValues() { output.innerHTML = "x: " + parseInt(logo._gsTransform.x) + " rotation: " + parseInt(logo._gsTransform.rotationY); //you can also target the element being tweened using this.target //console.log(this.target.x); } The demo below illustrates how to read transform values during an animation. See the Pen _gsTransform demo: animation by GreenSock (@GreenSock) on CodePen. We strongly recommend always setting transform data through GSAP for optimized for performance (GSAP can cache values). Unfortunately, the browser doesn't always make it clear how certain values should be applied. Browsers report computed values as matrices which contain ambiguous rotational/scale data; the matrix for 90 and 450 degrees is the same and a rotation of 180 degrees has the same matrix as a scaleX of -1 (there are many examples). However, when you set the values directly through GSAP, it's crystal clear. Happy tweening!

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