vue2 css3 实现椭圆轨迹自定义旋转

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最近有个需求是实现围绕旋转的css特效,但是网上找的大部分是写死的,没办法只改变内容,个数的情况下自动算出css参数,所以有了这个需求

效果图

2022-8-12.gif

  <div>
    <h1>CSS Swiper</h1>
    <div v-for="item in imageList" :key="item.id" class="ball" :style="item.style">
      <img :src="item.img" />
    </div>
  </div>
</template>


<script>
export default {
  name: "cssSwiper",
  data() {
    return {
      imageList: [          //图片列表
        {
          img: "https://picsum.photos/200/200?random=1",
          style: {},
        },
        {
          img: "https://picsum.photos/200/200?random=2",
          style: {},
        },
        {
          img: "https://picsum.photos/200/200?random=3",
          style: {},
        },

      ],
      ballCount: 0,
      aniSec: 20,//循环时长
    };
  },
  mounted() {
    this.ballCount = this.imageList.length;

    this.imageList.forEach((element, index) => {
      // 获取每个球的动画时间
      let base = this.aniSec / this.ballCount;

      // 获取每个球的动画延迟时间(这里要从动画的四分之一开始,要不然动画会有一个起始位置)
      let delBase = this.aniSec / 4;

      element.style = {
        animation:
          `animX ${this.aniSec / 2}s cubic-bezier(0.36, 0, 0.64, 1) -${
            base * index + delBase
          }s infinite alternate, ` +
          `animY ${this.aniSec / 2}s cubic-bezier(0.36, 0, 0.64, 1) -${
            base * index
          }s infinite alternate, ` +
          `scale ${this.aniSec}s cubic-bezier(0.36, 0, 0.64, 1) -${
            base * index
          }s infinite alternate`,
      };
    });
  },
  methods: {},
};
</script>

<style lang="scss">
@keyframes animX {
  0% {
    left: 0px;
  }

  100% {
    left: 1000px;
  }
}

@keyframes animY {
  0% {
    top: 0px;
  }

  100% {
    top: 600px;
  }
}

@keyframes scale {
  0% {
    transform: scale(0.7);
  }

  50% {
    transform: scale(1);
  }

  100% {
    transform: scale(0.7);
  }
}

.ball {
  width: 200px;
  height: 200px;
  background-color: #f66;
  border-radius: 50%;
  position: absolute;
  color: #fff;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#lopp {
  width: 1000px;
  height: 600px;
  border: 2px solid #999;
  border-radius: 50%;
  position: relative;
  left: 50px;
  top: 100px;
}
</style>

参考代码:juejin.cn/post/684490…

23/12/15更新: 49年入国军,google在Chrome 111 增加了对三角函数 sin()cos()tan()asin()acos()atan() 和 atan2(),不需要复杂计算即可实现。

DEMO:codepen.io/web-dot-dev…