How to use CSS to achieve dynamic effects of color-changing rotation animation

This article introduces to you how to use CSS to achieve the dynamic effect of color-changing rotation animation. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Effect preview

Code interpretation

Definition of dom, container Contains 9 elements:

<div>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
</div>

Centered display:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: black;
}

Define the container size:

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

Set the style of the lines in the 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%;
}

Let the lines Display in the center of the container:

.container {
    display: flex;
    align-items: center;
    justify-content: center;
}

Define variables to gradually extend the line from the center to the outside:

.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);
    }
}

Define the color change The animation effect is based on 360 degrees of the hue circle as 100%. The --percent variable refers to the position of 100%:

@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 color-changing animation effect to the container:

.container {
    --deg: calc(var(--percent) / 100 * 360deg);
    color: hsl(var(--deg), 100%, 50%);
    animation: change-color 5s linear infinite;
}

Done!

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