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Draggable - Calculate progress to next snap point

microeinhundert 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 Some information, especially the syntax, may be out of date for GSAP 3.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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Hello everyone, i think this is more of a math related question i struggle finding a solution for.


I have a slider that is draggable and stops at the different slides with a snap point. Now i want to tween a value from 0 to 1 while between the snap points. I need a way to calculate the progress to the next snap point, that means 0 if at one of the snap points and 1 if 1px in front of the next snap point, then back at 0 and again from the beginning. Is there some math magic ?that can give me this value?


Thanks in advance.



Bildschirmfoto 2019-06-14 um 07.53.27.png

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You don't actually want it to be contingent on exactly 1px away, do you? Like...what if it's 0.5px away, what progress (decimal) would you expect? 


My guess is that you'd want something like this:

function getProgress(x) {
  return (x % 200) / 200;


Just feed in an x value and it'll give you a 0-1 progress amount. 


Does that help? 

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