CSS Animations - Dynamic Curved Lines Between Divs That Move Up & Down - css

Question

I have dots moving up and down with a CSS animation, however I'd like to draw a dynamic curved line between them to create "Curved Chart" type look (a chart isn't the actual end goal, just the visual effect). How would I achieve this? Here's what I currently have:
The HTML Code:
<ul>
<li><span class="ball1"></span></li>
<li><span class="ball2"></span></li>
<li><span class="ball3"></span></li>
<li><span class="ball4"></span></li>
<li><span class="ball5"></span></li>
<li><span class="ball6"></span></li>
<li><span class="ball7"></span></li>
<li><span class="ball8"></span></li>
<li><span class="ball9"></span></li>
<li><span class="ball10"></span></li>
</ul>
The CSS Code:
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
background: white;
}
ul {
width: 340px;
height: 80px;
display: grid;
grid-template-columns: repeat(10, 1fr);
}
li {
display: flex;
justify-content: center;
position: relative;
}
li:before {
content: '';
width: 6px;
height: 90px;
position: absolute;
top: -5px;
border-radius: 90px;
}
span {
width: 20px;
height: 20px;
background: blue;
border-radius: 50%;
box-shadow: 0 0 20px -5px rgba(0, 0, 0, 0.3);
display: block;
animation: move 3s ease-in-out infinite alternate;
}
span.ball1 {
animation-delay: 0.25s;
}
span.ball2 {
animation-delay: 0.5s;
}
span.ball3 {
animation-delay: 0.75s;
}
span.ball4 {
animation-delay: 1s;
}
span.ball5 {
animation-delay: 1.25s;
}
span.ball6 {
animation-delay: 1.5s;
}
span.ball7 {
animation-delay: 1.75s;
}
span.ball8 {
animation-delay: 2s;
}
span.ball9 {
animation-delay: 2.25s;
}
span.ball10 {
animation-delay: 2.5s;
}
#keyframes move {
100% {
transform: translateY(58px);
}
}
Code Pen:
https://codepen.io/anon/pen/JwxJxO
Any help would be super useful, thank you!

Answer 1

You can add line between each circle to simulate such effect.
Here is a non-perfect example where I also used skew transformation to make the effect looks better (adjust the different value to get a perfect result like you want)
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
background: white;
}
ul {
width: 340px;
height: 80px;
display: grid;
grid-template-columns: repeat(10, 1fr);
}
li {
display: flex;
justify-content: center;
position: relative;
}
span {
width: 20px;
height: 20px;
background: blue;
border-radius: 50%;
box-shadow: 0 0 20px -5px rgba(0, 0, 0, 0.3);
display: block;
animation: move 3s ease-in-out infinite alternate;
position:relative;
transform: translateY(-29px);
}
li:not(:last-child) span::before {
content:"";
position:absolute;
top:50%;
left:100%;
width:20px;
height:2px;
background:blue;
animation-delay:inherit;
animation: skew 3s ease-in-out infinite alternate;
}
span.ball1 {
animation-delay: 0.25s;
}
span.ball2 {
animation-delay: 0.5s;
}
span.ball3 {
animation-delay: 0.75s;
}
span.ball4 {
animation-delay: 1s;
}
span.ball5 {
animation-delay: 1.25s;
}
span.ball6 {
animation-delay: 1.5s;
}
span.ball7 {
animation-delay: 1.75s;
}
span.ball8 {
animation-delay: 2s;
}
span.ball9 {
animation-delay: 2.25s;
}
span.ball10 {
animation-delay: 2.5s;
}
#keyframes move {
0% {
transform: translateY(-29px);
}
100% {
transform: translateY(29px);
}
}
#keyframes skew {
0% {
transform: skewY(13deg);
}
30% {
transform: skewY(10deg);
}
70% {
transform: skewY(-10deg);
}
100% {
transform: skewY(-13deg);
}
}
<ul>
<li><span class="ball1"></span></li>
<li><span class="ball2"></span></li>
<li><span class="ball3"></span></li>
<li><span class="ball4"></span></li>
<li><span class="ball5"></span></li>
<li><span class="ball6"></span></li>
<li><span class="ball7"></span></li>
<li><span class="ball8"></span></li>
<li><span class="ball9"></span></li>
<li><span class="ball10"></span></li>
</ul>

Answer 2

You can achieve this with kind of animations with canvas.
here's an example I found on codepen, which might be useful for your problem: https://codepen.io/nicolaszamarreno/pen/yXzGgG