CSS折线

// 写在vue项目中的


<template>
  <div id="app">
    <div class="list">
      <div class="item" v-for="(item,index) in list" :key="index">
        <ul :class="`dot_box dot_box${nn + 1}`" v-for="(mm, nn) in [1,2,3]" :key="nn">
          <li :class="`dot dot${nn + 1}`">
            <p class="location"></p>
          </li>
        </ul>
      </div>
      <div class="line_box">
        <p :class="`line line${index}`" v-for="(item,index) in list" :key="item.id"></p>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'App',
  data() {
    return {
      list: [
        {status: 1, id: 2003, location:{}},
        {status: 1, id: 211, location:{}},
        {status: 0, id: 13, location:{}},
        {status: 1, id: 203, location:{}},
        {status: 2, id: 22, location:{}},
        {status: 0, id: 23, location:{}},
        {status: 1, id: 213, location:{}},
        {status: 0, id: 273, location:{}},
        {status: 2, id: 234, location:{}},
        {status: 0, id: 324, location:{}},
        {status: 1, id: 45, location:{}},
        {status: 0, id: 485, location:{}},
        {status: 2, id: 15, location:{}},
        {status: 0, id: 105, location:{}},
        {status: 1, id: 1105, location:{}},
      ]
    }
  },
  created() {
    let vm = this;
  },
  mounted () {
    let vm = this;
    vm.renderLine();
    window.onresize = function () {
      vm.renderLine();
    }
  },
  components: {
  },
  methods: {
    renderLine() {
      let vm = this;
      let dot = document.getElementsByClassName('dot');
      let hight = dot[0].offsetHeight;
      let width = dot[0].offsetWidth;
      vm.list.forEach((m, n) => {
        let location = {};
        location.x = (m.status * width) + (0.5 * width) + m.status + 1;
        location.y = (n * hight) + (0.5 * hight) + n + 1;
        m.location = location;
        if(n != 0 ) {
          let css = vm.lineStyle(vm.list[n-1].location.x, vm.list[n-1].location.y, vm.list[n].location.x,vm.list[n].location.y);
          $(`.line${n - 1}`).attr('style',css);
        }
      })
    },
    lineStyle (x1, y1, x2, y2, lineWidth = 1, color = '#666'){
      let rectX = x1 < x2 ? x1 : x2;
      let rectY = y1 < y2 ? y1 : y2;
      let rectWidth = Math.abs(x1 - x2);
      let rectHeight = Math.abs(y1 - y2);
      //弦长
      let stringWidth = Math.ceil(Math.sqrt((rectWidth * rectWidth) + (rectHeight * rectHeight)));
      let xPad = (rectWidth - stringWidth) / 2;
      let yPad = (rectHeight - lineWidth) / 2;
      let radNum = Math.atan2((y1 - y2), (x1 - x2));
      return `
        position: absolute;
        width: ${ stringWidth }px;
        height: ${ lineWidth }px;
        background-color: ${ color };
        transform: translate(${ rectX + xPad }px, ${ rectY + yPad }px) rotate(${ radNum }rad);`;
    }
  }
}
</script>
<style lang="scss">
html,body {
  width: 100%;
  height: 100%;
}
ol,li {
  list-style: none;
}
* {
  margin: 0;
  padding: 0;
}
#app {
  position: relative;
  width: 100%;
}
  .line_box {
    width: 300px;
    height: 700px;
    // border: 1px solid green;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
  }
  .list {
    border: 1px solid green;
    width: 50%;
    .item {
      display: flex;
      .dot {
        width: 10vw;
        height: 50px;
        border: 1px solid pink;
        box-sizing: border-box;
        position: relative;
        .location {
          position: absolute;
          width: 10px;
          height: 10px;
          border-radius: 100%;
          top: 0;
          left: 0;
          right: 0;
          bottom: 0;
          margin: auto;
          z-index: 10;
          background: green;
        }
      }
    }
    .line {
      position: absolute;
    }
  }
</style>

　效果↓

感谢我牛气轰轰的老大实现了关键部分（划折线函数）