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TransformOrigin on Height transform?

sorciereus test
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Go to solution Solved by Rodrigo,

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 Some information, especially the syntax, may be out of date for GSAP 3.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 there. This seems rather simple but actually might not be as a simple of a solution as I was hoping for. I'm trying to transform the height of a div:

 

#mountain
{
position: absolute;
top: 175px;
left: 18px; 
width:123px;
height:46px;
background-image:url(mountain.png);
}

Using this GSAP

TweenMax.from('#mountain', .5, {height:0, transformOrigin:"bottom"});

On 

<div id="mountain"></div>

However it does transforms the height, it scales the div from the top down regardless of the transformOrigin setting. What am I missing? I suspect transformOrigin does not cover height? Can you suggest a workaround for what I'm trying to accomplish? 

 

Thanks. 

 

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  • Solution

Hi,

 

The issue is that according to the box model spec, the height and width are considered from the top/left corner of the element. Also keep in mind that the transform origin property is for... you got it!! transforms and not size animations, such as width and height. The transform origin will take effect using scales. So you could scale your element in the Y axis from 0 using that transform origin string:

TweenLite.from(element, 1, {scaleY:0, transformOrigin:"center bottom"});

Another option is the solution Shaun posted in this thread:

 

http://greensock.com/forums/topic/12283-expand-div-from-bottom-to-top/

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