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CSS

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HTML 

              
                
<div class="wrapSVG">
  <svg  id="svg" viewBox="0 0 600 1000">

    <circle class="big" cx="50" cy="50" r="25" />
    <circle class="big" cx="500" cy="200" r="25" />
    <circle class="big" cx="200" cy="500" r="25" />
    <circle class="big" cx="300" cy="800" r="25" />

    <polyline id="greenPath" points="50,50 500,200 200,500 300,800"/>

    <path class="limePath" d="M 50 50 L 500 200"/>
    <path class="limePath" d="M 500 200 L 200 500"/>
    <path class="limePath" d="M 200 500 L 300 800"/>

    <text id="end" x="300" y="840">THE END</text>

    <circle class="limeCircle" cx="50" cy="50" r="5"/>

  </svg>
</div>

<h1 id="line">SCROLL or CLICK</h1>

<nav>
  <button>ONE</button>
  <button>TWO</button>
  <button>THREE</button>
  <button>FOUR</button>
</nav>
!

CSS 

              
                body{
  margin:0;
  background-color:grey;
  height:4000px;
}
.wrapSVG{
  position:absolute;
  width:100vw;
  height:100vh;
  overflow:hidden;
}
#svg{
  margin-top:100px;
  overflow:visible;
  visibility:hidden;
  
}
#greenPath{
  fill:none;
  stroke:green;
  stroke-width:8;
}
.limePath{
  fill:none;
  stroke:lime;
  stroke-width:2;
}
.big{
  fill:green;
  stroke:lime;
  stroke-width:2;
}
.limeCircle{
  fill:lime;
  stroke:none;
}
text{
  font-family:arial;
  font-size:10px;
  text-anchor: middle;
  fill:#155f15;
  font-weight: 800; 
}

nav{
  position:fixed;
  top:0;
  right:0;
}
button{
  font-size: 15px;
  font-weight: 600;
  color: #3a3a3a;
  padding: 5px;
  width: 70px;
  height: 26px;
  background-color: #696868;
  border: none;
  border-radius: 5px;
  margin: 6px;
  outline: none;
  cursor: pointer;
}

#line{
  position:fixed;
  margin: 12px;
  font-family: sans-serif;
  font-size: 16px;
  color: #3a3a3a;
}
!

JS 

              
                console.clear();

let circles = gsap.utils.toArray(".big");
let pathSections = gsap.utils.toArray(".limePath");
let ball = document.querySelector(".limeCircle");

// proper start positions 
gsap.set(circles, {transformOrigin:'center'});
gsap.set(circles[0], {rotation:18});
gsap.set(circles[1], {rotation:197});
gsap.set(circles[2], {rotation:-46});
gsap.set(circles[3], {rotation:-111});

gsap.set('#svg', {autoAlpha:1});
gsap.set('#end', {scale:0, opacity:0})

MotionPathPlugin.convertToPath( "#greenPath" );

const dur = 3;
const tt = 3000; // total scrub time

// animate the limeCircle/diff. paths using params
function limeCircle(path){
let action = gsap.timeline({})
.to(ball, { 
  motionPath: {
    path:path, align:path, 
    alignOrigin: [0.5, 0.5]},
  duration: dur, ease:'none'
});
  return action;
}

// master timeline

let master = gsap.timeline({
  scrollTrigger: {
    trigger: ".wrapSVG",
    pin:true,
    start: 'top top',
    end: "+=" + tt,
    scrub: 0.3,
    onUpdate: ({progress}) => console.log(progress),
  },
  defaults:{duration:dur, ease:'none'},
  onComplete: () =>{
    gsap.to('#end', {scale:1, opacity:1})
  }
})
.from(circles, {drawSVG:"0", stagger:dur*2})
.from(pathSections, {drawSVG:"0", stagger:dur*2},dur)

.add(limeCircle(pathSections[0]), dur)
.add(limeCircle(pathSections[1]), dur*3)
.add(limeCircle(pathSections[2]), dur*5)

.to('#svg', {attr:{viewBox:'0 150 600 1000'}}, dur)
.to('#svg', {attr:{viewBox:'0 450 610 1000'}}, dur*3)
.to('#svg', {attr:{viewBox:'200 780 200 500'}}, dur*5)

.set('#end', {scale:1, opacity:0}, dur*5)

// per button ===================
var stops = [0, 0.428, 0.714, 1.01] // see progress of ST

let lastPos = 0,
    nextPos,
    dist = [lastPos];

gsap.utils.toArray('button').forEach(function(button, i) {
  
  function go(here, speed){
    gsap.to(window, {
      scrollTo: tt*stops[here],
      duration: 3*speed, ease:'power1.inOut'
    });
    dist = [here]; // actual dist
  }

  button.addEventListener('click', () =>{
    
    // same speed per dist (= no. of sections)
    nextPos = i;
    dist.push(nextPos);
    dist.sort((a, b) => b - a);
    let speed = dist[0] - dist[1]
    
    go(i, speed); 
    
    console.log(speed);
    
  })
});
!
999px

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