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Make path given by motionPath responsive

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Hello, sorry if my English is not good.


A few weeks ago, I started studying GSAP, and I am delighted with this library. I am making the circles rotate aligned on the white line, I base myself on the example provided by GSAP:

See the Pen mdrmZYY. by creativeocean (@creativeocean) on CodePen

I made the circles responsive, although I don't know if it is the best way to do it, the problem occurs when the size of the lines of the circles changes, I can't make the circles stay aligned to the white line. I don't know if the problem is related to the way I use svg or gsap.


I hope I have explained myself well.

See the Pen XWaGYda by -Jose- (@-Jose-) on CodePen

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That's because you're trying to use a motionPath that doesn't exist in the DOM. MotionPathPlugin needs to plot the element's location in the viewport, but it can't do that if it's not in the DOM :)


So you can just remove the parameter that is telling the convertToPath() not to swap the element in (I'm curious why you were doing that):

// BAD
MotionPathPlugin.convertToPath('.circle_line2', false)[0]


Does that clear things up? 

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Hi @GreenSock

I have modified that part, but I still have the problem of making it responsive, in the example I try to define the motionPath and change the radius of the circular lines every time the window changes size.

      window.onresize = window.onload = function(){
        gsap.set('.stage', {x:'95%', y:'50%', opacity:1})

        let viewportH = window.innerHeight;
        let viewportW = window.innerWidth;
        let size = (viewportW/2) / $(".circle_line").length;
        $( ".circle_line" ).each(function( index ) {
          gsap.set(this, {r: size*(index+1) + 'px'});
        let t1 = gsap.timeline();

        t1.to('.e1',  {
            path: function(index, element){
              return MotionPathPlugin.convertToPath('.circle_line2')[0];
            start: function(index){
              let pos = .5/5;
              return pos * index;
            end: function(index){
              let end = ((.5/5)*index) + .5;
              return end;
          yoyo: true
        }, 'orbs')

I made motionPath not swap the elements for two reasons:

  • when trying to define the radius in percentage, motionPath doesn’t work.
  • When resizing the radius, it didn’t resize.

The truth is that I am somewhat confused, if my problem is related to svg or motionPath.

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If you're changing the radius, then of course you'd need to re-convert that newly updated <circle> into a <path> so that MotionPathPlugin can use it. So you could keep an invisible copy of that <circle> on the stage and just re-convert that each time you update the radius (and don't swap, like you originally had it). Once you convert a <circle> to a <path>, it obviously bakes all those values into the path so you can't alter the radius. 

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