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Mr Pablo

Odd scale and position behaviour?

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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 Some information, especially the syntax, may be out of date for GSAP 3.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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I am positioning an image via some Tweens, and have set the x & y properties, as well as scaleX and scaleY.

 

Doing so, the image is assigned a transform matrix in CSS, but I don't think it is behaving as it should.

 

E.g. I have a 200x200 square "canvas/stage", I place a 200x200 colured square, positioned 0,0 and scaled by 0.5,0.5. This means I should see a 100x100 square, in the top left corner. BUT what I get is a 100x100 square, in the centre of the canvas/stage area.

 

So it looks like the scaling is working after the positioning, but I need the scaling to happen first, to keep the images transform point at the top left.

 

Is there a way to make sure this is the case?

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CSS transforms use the center of the object as their origin. You can set the transformOrigin as follows:

TweenLite.to(elem, 1, {scale:0.5, transformOrigin:"left top"})

//or use any units
TweenLite.to(elem, 1, {scale:0.5, transformOrigin:"0% 0%"})

Check the CSSPlugin docs for more info on transformOrigin

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