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Change transformOrigin AFTER a scale animation

daweed31 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 Some information, especially the syntax, may be out of date for GSAP 3.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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Hi,

I would like to change the transformOrigin after a first animation of the scale (for make in the future another animation with a différent origin). The problem is that there is a jump. Is there a solution for avoid it ? Thanks you in advance ! :)

PS : I made a codepen with minimal code (https://codepen.io/daweed31/pen/WBPMaQ). The real project is more complexe : scale a grid of picture with a vertical transformOrigin equal of the scroll, and when the user decides reverse the scale with a different transformOrigin. You can see a gif of the real project here (10Mb) : felixfaure.fr/images/gsap_transform_origin.gif

See the Pen WBPMaQ by daweed31 (@daweed31) on CodePen

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The jump is completely normal because of the way transforms work (totally unrelated to GSAP). If you scale something from its bottom left corner, it ends up at a completely different place than if you scale it from its upper right corner. 

 

If you want to change it dynamically without the jump, you'd need to compensate its translation (x/y). Here's a fork of your codepen that uses a function I whipped together for that purpose: 

See the Pen ffd4d338f911617756aa1daaa96d8c5d?editors=0010 by GreenSock (@GreenSock) on CodePen

 

The function is: 

function smoothOriginChange(element, transformOrigin) {
  if (typeof(element) === "string") {
    element = document.querySelector(element);
  }
  var before = element.getBoundingClientRect();
  element.style.transformOrigin = transformOrigin;
  var after = element.getBoundingClientRect();
  TweenLite.set(element, {x:"+=" + (before.left - after.left), y:"+=" + (before.top - after.top)});
}

 

Does that help? 

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