旋转的错觉

像这种旋转动画怎么实现呢？

1. 首先先实现布局：布局的话可以采用 Grid 布局，通过给不同元素设置不同的分区实现下图

.container {
  width: 300px;
  height: 300px;
  margin: 0 auto;
  margin-top: 100px;
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  grid-template-columns: repeat(3, 1fr);
  grid-template:
    'a a b'
    'c e b'
    'c d d';
  gap: 5px;

  .item {
    overflow: hidden;
    border: 1px solid #ddd;
    
    img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    &:nth-of-type(1) {
      grid-area: a;
    }

    &:nth-of-type(2) {
      grid-area: b;
    }

    &:nth-of-type(3) {
      grid-area: c;
    }

    &:nth-of-type(4) {
      grid-area: d;
    }

    &:nth-of-type(5) {
      grid-area: e;
    }
  }
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

2. 再进行动画处理，这里动画分两部分处理
   1. 一是外层容器顺时针旋转
   2. 二是里层的图片逆时针旋转

.container {
  animation: rotation 10s infinite linear;
  .item { 
    img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      animation: rotation 10s infinite linear reverse;
    }
  }
}
@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

经过上面两步会发现图片旋转是实现了，是会有白边。这是因为图片太小，在旋转过程中不够铺满外层容器，处理方法就是放大图片就行喽。

img {
  width: 210%;
  height: 210%;
  object-fit: cover;
  animation: rotation 10s infinite linear reverse;
}

完整代码如下：

import React from 'react';
import img1 from './image/3.jpg';
import img2 from './image/5.jpg';
import img3 from './image/2.jpg';
import img4 from './image/4.jpg';
import img5 from './image/1.jpg';
import './index.less'

export default function index() {
  return (
    <div className="container">
      <div className="item">
        <img src={img1} alt="" />
      </div>
      <div className="item">
        <img src={img2} alt="" />
      </div>
      <div className="item">
        <img src={img3} alt="" />
      </div>
      <div className="item">
        <img src={img4} alt="" />
      </div>
      <div className="item">
        <img src={img5} alt="" />
      </div>
    </div>
  );
}

.container {
  width: 300px;
  height: 300px;
  margin: 0 auto;
  margin-top: 100px;
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  grid-template-columns: repeat(3, 1fr);
  grid-template:
    'a a b'
    'c e b'
    'c d d';
  gap: 5px;
  animation: rotation 10s infinite linear;

  .item {
    overflow: hidden;
    border: 1px solid #ddd;
    display: flex;
    justify-content: center;
    align-items: center;
    
    img {
      width: 210%;
      height: 210%;
      object-fit: cover;
      animation: rotation 10s infinite linear reverse;
    }

    &:nth-of-type(1) {
      grid-area: a;
    }

    &:nth-of-type(2) {
      grid-area: b;
    }

    &:nth-of-type(3) {
      grid-area: c;
    }

    &:nth-of-type(4) {
      grid-area: d;
    }

    &:nth-of-type(5) {
      grid-area: e;
    }
  }
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}