Echart实现3D饼图示例

在可视化项目中，很多地方会遇见图表；echart是最常见的；这个示例就是用Echart， echart-gl实现3D饼图效果，复制即可用

//需要安装，再引用依赖

import * as echarts from "echarts";
import 'echarts-gl';

initUserTypeEchart() {
      let that = this;
      let chartDom = document.getElementById("echart-id");
      let myChart = echarts.init(chartDom);
      function getParametricEquation(startRatio,endRatio,isSelected,isHovered,k,h) {
        const midRatio = (startRatio + endRatio) / 2;
        const startRadian = startRatio * Math.PI * 2;
        const endRadian = endRatio * Math.PI * 2;
        const midRadian = midRatio * Math.PI * 2;
        // 如果只有一个扇形，则不实现选中效果。
        if (startRatio === 0 && endRatio === 1) {
          isSelected = false;
        }
        k = typeof k !== "undefined" ? k : 1 / 3;
        const offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
        const offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;
        // 鼠标滑过时外环放大大小
        const hoverRate = isHovered ? 1.05 : 1;
        // 返回曲面参数方程
        return {
          u: { min: -Math.PI, max: Math.PI * 3, step: Math.PI / 32 },
          v: { min: 0, max: Math.PI * 2, step: Math.PI / 20 },

          x(u, v) {
            if (u < startRadian) {
              return (
                offsetX +
                Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
              );
            }
            if (u > endRadian) {
              return (
                offsetX +
                Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
              );
            }
            return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
          },

          y(u, v) {
            if (u < startRadian) {
              return (
                offsetY +
                Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
              );
            }
            if (u > endRadian) {
              return (
                offsetY +
                Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
              );
            }
            return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
          },

          z(u, v) {
            if (u < -Math.PI * 0.5) {
              return Math.sin(u);
            }
            if (u > Math.PI * 2.5) {
              return Math.sin(u) * h * 0.1;
            }
            // 当前图形的高度是Z根据h（每个value的值决定的）
            return Math.sin(v) > 0 ? 1 * h * 0.1 : -1;
          },
        };
      }
      // 饼图数据
      var optionData = [
        { name: '辣条', value: 100, percentage: 25 },
        { name: '亲嘴烧', value: 100, percentage: 25  },
        { name: '牛奶', value: 100, percentage: 25  },
        { name: '可乐', value: 100, percentage: 25  }
      ]
      function getPie3D(pieData, internalDiameterRatio) {
        const series = [];
        let sumValue = 0;
        let startValue = 0;
        let endValue = 0;
        const legendData = [];
        let colors = ["#FFB82C", "#009EA8", "#2E9CFF", "#BB36DE"];
        const k =
          typeof internalDiameterRatio !== "undefined"
            ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
            : 1 / 3;
        for (let i = 0; i < pieData.length; i += 1) {
          sumValue += pieData[i].value;
          const seriesItem = {
            name:
              typeof pieData[i].name === "undefined"
                ? `series${i}`
                : pieData[i].name,
            radius: ["40%", "60%"],
            type: "surface",
            parametric: true,
            wireframe: { show: false },
            pieData: pieData[i],
            pieStatus: { selected: false, hovered: false, k },
          };
          if (typeof pieData[i].itemStyle !== "undefined") {
            const { itemStyle } = pieData[i];
            // eslint-disable-next-line no-unused-expressions
            typeof pieData[i].itemStyle.color !== "undefined"
              ? (itemStyle.color = pieData[i].itemStyle.color)
              : null;
            // eslint-disable-next-line no-unused-expressions
            typeof pieData[i].itemStyle.opacity !== "undefined"
              ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
              : null;
            seriesItem.itemStyle = itemStyle;
          }
          // series = getPie3D(optionData, 0.3)
          series.push(seriesItem);
        }
        for (let i = 0; i < series.length; i += 1) {
          endValue = startValue + series[i].pieData.value;
          series[i].pieData.startRatio = startValue / sumValue;
          series[i].pieData.endRatio = endValue / sumValue;
          series[i].parametricEquation = getParametricEquation(
            series[i].pieData.startRatio,
            series[i].pieData.endRatio,
            false,
            true,
            k,
            10 // 在此处传入饼图初始高度h
          );
          startValue = endValue;
          legendData.push({
            name: series[i].name,
            textStyle: { color: colors[i] },
          });
        }
        // 准备待返回的配置项，把准备好的series 传入。
        const option = {
          title: {
            show: false,
          },
          //   右边提示文本
          legend: {
            show: true,
            type: "scroll",
            right: 20,
            top: "center",
            orient: "vertical", // 纵向
            icon: "circle", // icon 类型 标记类型包括 'circle'圆, 'rect'方, 'roundRect'圆角, 'triangle'三角形, 'diamond'lin, 'arrow'箭头, 'pin', 'arrow', 'none'
            itemHeight: 12, // icon高度
            itemWidth: 12, // icon 宽度
            itemGap: 10, // 图例间隔 --每个title之间的间隔
            data: legendData,
            formatter: (name) => {
              if (pieData.length) {
                const item = pieData.filter((item) => item.name === name)[0];
                // console.log(item, name)
                var arr = [
                  `{a|${name}}{b|${item.value}户 (${item.percentage}%)}`,
                ];
                return arr;
                // return `${name}：${item.value}`
              }
            },
            textStyle: {
              color: "auto",
              rich: {
                //改样式 和下面formatter一起
                a: {
                  align: "left",
                  color: "#000",
                  width: 80,
                  fontSize: 12, // 字体大小被覆盖了,这里重新定义
                },
                b: {
                  align: "right",
                  // color: '#59e6ed',
                  fontSize: 12,
                },
              },
            },
          },
          //   每一块区域的颜色
          color: ["#009EA8", "#2E9CFF", "#FFB82C", "#BB36DE"],
          tooltip: {
            trigger: "item",
            formatter: (params) => {
              if (params.seriesName !== "mouseoutSeries") {
                return `${params.marker}${params.seriesName}：${
                  pieData[params.seriesIndex].value
                }户`;
              }
              return "";
            },
          },
          xAxis3D: { min: -1, max: 1 },
          yAxis3D: { min: -1, max: 1 },
          zAxis3D: { min: -1, max: 1 },
          grid3D: {
            show: false,
            boxHeight: 30, // 修改三维场景高度
            top: -20,
            width: 200,
            viewControl: {
              // 3d效果可以放大、旋转等，
              alpha: 20, // 上下绕X轴角度
              beta: 0, //左右绕Y轴角度
              // projection: 'perspective',//默认为透视投影'perspective'，也支持设置为正交投影'orthographic'
              rotateSensitivity: 1,
              zoomSensitivity: 0,
              panSensitivity: 0,
              autoRotateSpeed: 50, //物体自传的速度
              autoRotate: false, // 是否自动旋转
              distance: 270, // 距离越小看到的饼图越大
            },
          },
          series,
        };
        return option;
      }
      // 可做为调整内环大小 0为实心圆饼图，大于0 小于1 为圆环
      let option = getPie3D(optionData, 0);
      myChart.setOption(option);
      window.addEventListener("resize", function () {
        myChart.resize();
      });
    },