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  1. GreenSock

    CustomBounce

    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
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