【vue2绘制echarts环状图】vue2使用echarts绘制环状图

效果图：
在这里插入图片描述

鼠标悬浮的效果图：
在这里插入图片描述

1：安装echarts

yarn add echarts@5.3.2
或
npm install echarts@5.3.2 --save

在这里插入图片描述

2.局部引入使用

在vue页面引入

<template>
  <div>
    <div
      ref="myChart"
      style="
         {
          width: 400px;
          height: 350px;
        }
      "
    ></div>
  </div>
</template>

<script>
import * as echarts from "echarts";

export default {
  name: "Home",
  data() {
    return {
      // 总数
      countCharData: 0,
      // 存放echarts组装的数据
      echartsData: [],
      // 模拟的数据
      data: [
        {
          rankNo: 1,
          companyCode: "1",
          companyName: "test1",
          companyNickName: "test1",
          count: 7921,
          percentage: 63.79,
        },
        {
          rankNo: 2,
          companyCode: "142",
          companyName: "test12",
          companyNickName: "test12",
          count: 1759,
          percentage: 14.16,
        },
        {
          rankNo: 3,
          companyCode: "24",
          companyName: "test13",
          companyNickName: "test13",
          count: 1106,
          percentage: 8.91,
        },
        {
          rankNo: 4,
          companyCode: "8",
          companyName: "test14",
          companyNickName: "test14",
          count: 899,
          percentage: 7.24,
        },
        {
          rankNo: 5,
          companyCode: "21",
          companyName: "test15",
          companyNickName: "test15",
          count: 422,
          percentage: 3.4,
        },
        {
          rankNo: 6,
          companyCode: "other",
          companyName: "其他",
          companyNickName: "其他",
          count: 311,
          percentage: 2.5,
        },
      ],
    }
  },
  created() {
    this.init_load();
  },
  // 销毁实例
  disposeChart() {
    echarts.dispose(this.$refs.myChart);
  },
  methods: {
    // 初始化
    async init_load() {
      // 这里this.data原本是请求接口的数据，现在写dom我直接把data数据写死
      this.data.forEach((item, i) => {
        this.countCharData += item.count;
        this.echartsData.push({
          value: item.count,
          name: item.companyNickName,
          itemStyle: {
            color: this.handChartColor(i),
          },
        });
      });
      await this.drawChart();
    },
    drawChart() {
      // 基于准备好的dom，初始化echarts实例  这个和上面的main对应
      echarts.init(this.$refs.myChart).setOption({
        title: {
          text: this.formatNumber(this.countCharData), //环状图中间显示数量的主标题
          subtext: "资源总数", //副标题
          left: "38%",
          top: "28%",
          textAlign: "center",
          // 主标题的颜色
          textStyle: { 
            color: "#000",
            fontSize: 22,
            align: "center",
          },
          // 副标题的颜色
          subtextStyle: {
            color: "#86909C",
            fontSize: 16,
            align: "center",
          },
        },
        tooltip: {
          trigger: "item",
        },

        series: [
          {
            name: "资源数",
            type: "pie",
            radius: ["45%", "55%"],// 环状的环粗细
            center: ["40%", "35%"],
            data: this.echartsData, //数据
            // 这里是不显示环状图外面的线
            label: {
              show: false,
              position: "center",
            },
            labelLine: {
              length: 5,
              length2: 0,
              maxSurfaceAngle: 80,
            },
          },
        ],
      });
    },
    //数字每三位加逗号的方法
    formatNumber(num) {
      return Number(num).toLocaleString();
    },
    // 我这里只展示前六条数据，所有只给六个颜色
    handChartColor(i) {
      let color = "";
      switch (i) {
        case 0:
          color = "#B4ADF3";
          break;
        case 1:
          color = "#FFA58A";
          break;
        case 2:
          color = "#D91A45";
          break;
        case 3:
          color = "#FE59A5";
          break;
        case 4:
          color = "#FEB028";
          break;
        default:
          color = "#737CCB";
          break;
      }
      return color;
    },
  },
};
</script>