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Problem with skewY

Praney Behl 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 Some information, especially the syntax, may be out of date for GSAP 3.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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Yes indeed. skewY is a tricky one because technically it's a phantom value. To optimize performance, GSAP combines all skewing into the skewX and rotation values (skewY is simply a rotation with the opposite skewX). In other words, visually skewY:30 is the same as rotation:30, skewX:30. The matrix math is faster when we handle it that way instead of trying to manage an extra variable. So keep that in mind when you're analyzing the _gsTransform data. There was a bug that caused the engine not to record the skewY value properly, so each time you skewed to a new value, it was acting as though skewY was 0 (but it had already been applied to skewX and rotation).


I've attached a preview version of CSSPlugin 1.11.8 with a fix in place. Does that work well for you? 


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  • 8 months later...

I just ran into this.  I had set skewY on an object and later rotated it 360 degrees.  I expected, after the rotation, it would look exactly the same as before the rotation but instead looked like a skewX.  It makes sense that skewY is a phantom value for performance, but this was a head-scratcher.  


Perhaps if rotationZ was added to the rotation of skewY instead of replacing it, that would be more obvious.  That might require an extra variable in _gsTransform, though, which is not optimal.

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To be clear, I'm not necessarily suggesting that this should be "fixed." It works fine as implemented.  A user can just manually add the extra rotation.  I'm just pointing out that I ran into the same confusion that the original poster did.  Maybe my comments will help anyone else wondering why skewY turns into skewX.

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