How to use CSS to realize the dynamic effect of color rotation animation

This article introduces to you about how to use CSS to realize the dynamic effect of color rotation animation, there is a certain reference value, there is a need for friends to refer to, I hope you have some help.

Effect Preview

Code interpretation

To define the DOM, the container contains 9 elements:

<div class= "Container" >    <span></span>    <span></span>    <span></ span>    <span></span>    <span></span>    <span></span>    < span></span>    <span></span>    <span></span></div>

Center display:

body {    margin:0;    HEIGHT:100VH;    Display:flex;    Align-items:center;    Justify-content:center;    Background-color:black;}

Define Container Dimensions:

. container {    width:30em;    Height:30em;    font-size:12px;}

To set the style of a line in a container:

. container {    color:lime;}. Container span {    position:absolute;    width:5em;    height:5em;    Border-style:solid;    Border-width:1em 1em 0 0;    Border-color:currentcolor Transparent;    border-radius:50%;}

To center a line in a container:

. container {    Display:flex;    Align-items:center;    Justify-content:center;}

Define variables to gradually extend the lines from the center outward:

. container span {    --diameter:calc (5em + (VAR (--n)-1) * 3em);    Width:var (--diameter);    Height:var (--diameter);}. Container Span:nth-child (1) {    --n:1;}. Container Span:nth-child (2) {    --n:2;}. Container Span:nth-child (3) {    --n:3;}. Container Span:nth-child (4) {    --n:4;}. Container Span:nth-child (5) {    --n:5;}. Container Span:nth-child (6) {    --n:6;}. Container Span:nth-child (7) {    --n:7;}. Container Span:nth-child (8) {    --n:8;}. Container Span:nth-child (9) {    --n:9;}

Set the animation effect to rotate the line:

. container span {    animation:rotating linear infinite;    Animation-duration:calc (5s/(9-var (--n) + 1));} @keyframes Rotating {To    {        transform:rotate (1turn);    }}

Defines the animation effect that changes color, with the Hue ring 360 degrees a week to the 100%,--percent variable is where this 100% is located:

@keyframes Change-color {    0, 100% {        --percent:0;    }    10% {        --percent:10;    }    20% {        --percent:20;    }    30% {        --percent:30;    }    40% {        --percent:40;    }    50% {        --percent:50;    }    60% {        --percent:60;    }    70% {        --percent:70;    }    80% {        --percent:80;    }    90% {        --percent:90;    }}

Finally, apply the animated effect of color change to the container:

. container {    --deg:calc (VAR (--percent)/360deg);    COLOR:HSL (Var (--deg), 100%, 50%);    Animation:change-color 5s linear Infinite;}

Done!

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