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Path animation on scroll

Can we make this path animation on scroll similar to this


Basically, you will need to write a piece of script to control the animation as I mentioned in this thread: Fast vs. Slow scroll of objects
However, to make the content scroll horizontally as in your sample, you must set fixed position for your scene and handle scroll event on window object.

  1. Add an additional timeline, then add your own animations to that timeline.
  2. Set scene Overflow: Hidden in Properties pane because we must handle scroll in document level.
  3. Add script to Scene Activate event to set its position to fixed:
    function onSceneActivated(doc, e) { = 'fixed';
  1. Add script to Document Ready event to make the content overflow vertically, and to control timeline in step 1 when scrolling:
    function onDocReady(doc, e) {
      // make content overflow vertically = '3000px'; // you can change this number
      // control timeline when scrolling
      window.addEventListener('scroll', function() {
        var htmlElem = document.documentElement;
         // replace Timeline_2 by the name of the timeline in step 1
        var timeline = doc.getTimeline('Timeline_2');
        // map scroll position to timeline timestamp
        // scroll 0 => timeline 0, scroll max (scrollHeight - clientHeight) => timeline duration
        // Note: htmlElem.scrollTop doesn't work on iOS
        // window.scrollY doesn't work on IE
        // => use window.pageYOffset / (htmlElem.scrollHeight - htmlElem.clientHeight) * timeline.getDuration());
      }, false);

Sample project: horizontal scroll.saolapack (92.3 KB)


Hi Toan

This is awesome. :slight_smile: Thanks for the code. Also let me how do i make shape path animation as given in the example link. I don’t think saola currently supports shape morphing (tweening) feature. Screenshot for same is enclosed.




I’ve just updated the sample project above with path drawing animation, please check it again.
In that sample, onTimelineUpdated function is added to Timeline_2 Update event, this function in turn calls drawPath function to draw the freeform path.

Here is another sample that draws a shape automatically (without using scroll event):
line drawing.saolapack (2.0 KB)

FYI, we’ve planned to support shape drawing and morphing animations in version 3.


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