CSS 动画 - div 之间上下移动的动态曲线

Question

我有一些点在CSS动画中上下移动，但我想在它们之间画一条动态曲线，以创建"曲线图"类型的外观(图表不是实际的最终目标，只是视觉效果)。我将如何实现这一点？这是我目前拥有的：

HTML代码：

<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>

CSS代码：

* {
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);
}
}

代码笔：https://codepen.io/anon/pen/JwxJxO

任何帮助都会非常有用，谢谢！

Answer 1

您可以在每个圆之间添加线来模拟这种效果。

这里有一个非完美的例子，我还使用了偏斜变换来使效果看起来更好(调整不同的值以获得你想要的完美结果)

* {
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

您可以通过canvas的动画来实现这一点。

以下是我在codepen上发现的一个示例，它可能对您的问题有用：https://codepen.io/nicolaszamarreno/pen/yXzGgG