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Animate width from left to right

friendlygiraffe test
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Warning: Please note

This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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TweenLite.defaultEase = Power0.easeNone;

TweenMax.set(".mask1", {transformOrigin:"100% 50%"});
TweenMax.set(".mask2", {transformOrigin:"0% 50%"});

TweenMax.fromTo(".mask1", 2.2, {width:"0px"}, {width:"300px",  ease:Power0.easeNone, repeat:-1, repeatDelay:2})

TweenMax.fromTo(".mask2", 2.2, {width:"300px"}, {width:"0px", ease:Power0.easeNone, repeat:-1, repeatDelay:2})


Having different transform origins and using fromTo gets you the result I think you are looking for?

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Just now, mikel said:



And here a proper made to measure ...


See the Pen a83f0373bb538d1745958cfafae88ceb by mikeK (@mikeK) on CodePen


It could be easy.


Happy learning ...




Thanks Mikel, nearly - I need the text be static


Here's a better example of what I mean. Have a look at the red version for what I'm trying to achieve (without having to animated the text):


See the Pen OOeLxW by friendlygiraffe (@friendlygiraffe) on CodePen


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@friendlygiraffe whenever you are animating any element, make sure to set it's position. Otherwise you will see a lot of unexpected behavior.


@craftedbygc When you are animating width, transform origin doesn't really matter. It is only taken in consideration when you are doing any transforms like scaling, animating skewX/skewY etc.


See the Pen ?editors=0010 by Sahil89 (@Sahil89) on CodePen


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Hello @friendlygiraffe, why not just use an SVG clip-path or SVG mask?


Examples of animating the SVG <mask> element using the GSAP AttrPlugin:


See the Pen EbBKOz by jonathan (@jonathan) on CodePen


You want to stay away from animating left, margin-left or width since they trigger layout like @Sahil advised above. which means the browser has to calculate the layout on each render tick, which equals bad janky (lost frames) jitter bug ;)






Happy Tweening! :)


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  • 3 years later...
On 12/7/2017 at 8:13 PM, Carl said:

I haven't looked at all the examples in depth but setting right:0 on the element will make it grow from the right when you increase its width.


.mask2 {


The trick is just putting it in the proper place to begin with.

How to increase the speed of this animation?

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