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Deepak Oberoi

How to limit Draggable to a path

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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 Some information, especially the syntax, may be out of date for GSAP 3.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 want to limit a Draggable within a Path given for an AVG Layer. if that's possible?


I read about bounds but it says container or XY cordinates can be passed in bounds if we can pass an SVG path to bounds? something like http://jsfiddle.net/JwkYm/8/

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Hi @Deepak Oberoi


Draggable uses simple axis-aligned bounding box (AABB) collision detection. It can only detect overlap between 2 boxes, like what is returned by Element.getBoundingClientRect().


For other shapes, you will need to handle the collision detection yourself, like inside a liveSnap points function.



For collision detection between circles, lines, and convex polygons, you can use the Separating Axis Theorem (SAT). For concave polygons, you will have to split them up into smaller, convex shapes.


Here are 2 libraries that can help with that.




And here's a thread about using SAT with Draggable. I know that my demo doesn't work as intended in that thread, but I mentioned beforehand that it probably won't because you need to do collision detection while you're dragging.




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