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How to do collision detection with CSS plugin?

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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 Some information, especially the syntax, may be out of date for GSAP 3.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 trying to figure out how to do collision detection with greensock and the CSS plugin.

My CSS elements all have "position: absolute" and they are moved across the screen setting their x and y positions with TweenLite.


Normally you could use the DOM elements' position to calculate if their boundaries intersect, but how can you do this with css transforms?



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Use Element.getBoundingClientRect(). It reports back is bounding box with transforms.



If you're using Draggable, it can do this for you. There's a static method where you can pass in 2 elements and an optional threshold.


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