<template>
  <div ref="myEchart" style="width: 100%; height: 180px"></div>
</template>

<script>
import * as echarts from "echarts";
import "echarts-gl";
export default {
  data() {
    return {
      chartData: [
        {
          name: "危运",
          value: 40,
          number: 120,
          itemStyle: {
            // 透明度
            opacity: 0.7,
            // 扇形颜色
            color: "rgba(32,159,237,1)",
          },
        },
        {
          name: "包车",
          value: 30,
          number: 80,
          itemStyle: {
            // 透明度
            opacity: 0.7,
            // 扇形颜色
            color: "rgba(255,159,32,1)",
          },
        },
        {
          name: "班车",
          value: 20,
          number: 60,
          itemStyle: {
            // 透明度
            opacity: 0.7,
            // 扇形颜色
            color: "rgba(159,255,237,1)",
          },
        },
        {
          name: "重货",
          value: 10,
          number: 10,
          itemStyle: {
            // 透明度
            opacity: 0.7,
            // 扇形颜色
            color: "rgba(159,255,32,1)",
          },
        },
      ],
    };
  },
  mounted() {
    this.myMap = echarts.init(this.$refs.myEchart);
    this.myMap.setOption(this.getPie3D(this.chartData, 0.71));
  },
  methods: {
    getParametricEquation(startRatio, endRatio, isSelected, isHovered, k, h) {
      // 计算
      let midRatio = (startRatio + endRatio) / 2;

      let startRadian = startRatio * Math.PI * 2;
      let endRadian = endRatio * Math.PI * 2;
      let 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;
      }

      // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
      k = typeof k !== "undefined" ? k : 1 / 3;

      // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
      let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
      let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;

      // 计算高亮效果的放大比例（未高亮，则比例为 1）
      let 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: function (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: function (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: function (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;
          }
          return Math.sin(v) > 0 ? 1 * h * 0.1 : -1;
        },
      };
    },
    getPie3D(pieData, internalDiameterRatio) {
      let series = [];
      let sumValue = 0;
      let startValue = 0;
      let endValue = 0;
      let legendData = [];
      let k =
        typeof internalDiameterRatio !== "undefined"
          ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
          : 1 / 3;

      // 为每一个饼图数据，生成一个 series-surface 配置
      for (let i = 0; i < pieData.length; i++) {
        sumValue += pieData[i].value;

        let seriesItem = {
          name:
            typeof pieData[i].name === "undefined"
              ? `series${i}`
              : pieData[i].name,
          value:
            typeof pieData[i].value === "undefined"
              ? `series${i}`
              : pieData[i].value,
          type: "surface",
          parametric: true,
          wireframe: {
            show: false,
          },
          pieData: pieData[i],
          pieStatus: {
            selected: false,
            hovered: false,
            k: k,
          },
        };

        if (typeof pieData[i].itemStyle != "undefined") {
          let itemStyle = {};

          typeof pieData[i].itemStyle.color != "undefined"
            ? (itemStyle.color = pieData[i].itemStyle.color)
            : null;
          typeof pieData[i].itemStyle.opacity != "undefined"
            ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
            : null;

          seriesItem.itemStyle = itemStyle;
        }
        seriesItem.label = {
          formatter: "{a|{a}}{abg|}\n{hr|}\n  {b|{b}：}{c}  {per|{d}%}  ",
          backgroundColor: "#eee",
          borderColor: "#aaa",
          borderWidth: 1,
          borderRadius: 4,
          // shadowBlur:3,
          // shadowOffsetX: 2,
          // shadowOffsetY: 2,
          // shadowColor: '#999',
          // padding: [0, 7],
          rich: {
            a: {
              color: "#999",
              lineHeight: 22,
              align: "center",
            },
            // abg: {
            //     backgroundColor: '#333',
            //     width: '100%',
            //     align: 'right',
            //     height: 22,
            //     borderRadius: [4, 4, 0, 0]
            // },
            hr: {
              borderColor: "#aaa",
              width: "100%",
              borderWidth: 0.5,
              height: 0,
            },
            b: {
              fontSize: 16,
              lineHeight: 33,
            },
            per: {
              color: "#eee",
              backgroundColor: "#334455",
              padding: [2, 4],
              borderRadius: 2,
            },
          },
        };
        series.push(seriesItem);
      }
      // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
      // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
      const that = this;
      for (let i = 0; i < series.length; i++) {
        endValue = startValue + series[i].pieData.value;

        series[i].pieData.startRatio = startValue / sumValue;
        series[i].pieData.endRatio = endValue / sumValue;
        series[i].parametricEquation = that.getParametricEquation(
          series[i].pieData.startRatio,
          series[i].pieData.endRatio,
          false,
          false,
          k,
          series[i].pieData.value
        );

        startValue = endValue;
        legendData.push(series[i].name);
      }

      // 补充一个透明的圆环，用于支撑高亮功能的近似实现。
      series.push({
        name: "mouseoutSeries",
        type: "surface",
        parametric: true,
        wireframe: {
          show: false,
        },
        itemStyle: {
          opacity: 0,
        },
        parametricEquation: {
          u: {
            min: 0,
            max: Math.PI * 2,
            step: Math.PI / 20,
          },
          v: {
            min: 0,
            max: Math.PI,
            step: Math.PI / 20,
          },
          x: function (u, v) {
            return Math.sin(v) * Math.sin(u) + Math.sin(u);
          },
          y: function (u, v) {
            return Math.sin(v) * Math.cos(u) + Math.cos(u);
          },
          z: function (u, v) {
            return Math.cos(v) > 0 ? 0.1 : -0.1;
          },
        },
      });
      const data = this.chartData;
      // 准备待返回的配置项，把准备好的 legendData、series 传入。
      let option = {
        //animation: false,

        legend: {
          icon: "circle",
          data: legendData,
          top: 50,
          width: 50,
          itemGap: 20,
          right: 40,
          formatter: function (value) {
            var res = "";
            for (var i = 0; i < data.length; i++) {
              if (data[i].name == value) {
                res = pieData[i].name + data[i].number;
              }
            }
            if (!res) {
              res = value;
            }
            return res;
          },
          textStyle: {
            color: "#fff",
            fontSize: 16,
          },
          rich: {
            align: "center",
            text: {
              fontSize: 14,
              color: "#fff",
              fontWeight: "500",
              padding: [15, 0, 5, 0],
            },
          },
          color: "#fff",
        },
        tooltip: {
          formatter: (params) => {
            if (params.seriesName !== "mouseoutSeries") {
              return `${
                params.seriesName
              }<br/><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${
                params.color
              };"></span>${option.series[params.seriesIndex].pieData.number}`;
            }
          },
        },
        xAxis3D: {
          min: -1,
          max: 1,
        },
        yAxis3D: {
          min: -1,
          max: 1,
        },
        zAxis3D: {
          min: -1,
          max: 1,
        },
        grid3D: {
          left: "-10%",
          top: 20,
          show: false,
          boxHeight: 5,
          viewControl: {
            //3d效果可以放大、旋转等，请自己去查看官方配置
            alpha: 40,
            // beta: 40,
            rotateSensitivity: 0,
            zoomSensitivity: 0,
            panSensitivity: 0,
            autoRotate: false,
          },
          //后处理特效可以为画面添加高光、景深、环境光遮蔽（SSAO）、调色等效果。可以让整个画面更富有质感。
          postEffect: {
            //配置这项会出现锯齿，请自己去查看官方配置有办法解决
            enable: true,
            bloom: {
              enable: true,
              bloomIntensity: 0,
            },
            SSAO: {
              enable: false,
              quality: "medium",
              radius: 2,
            },
          },
        },
        series: series,
      };
      return option;
    },
  },
};
</script>

<style lang="scss" scoped>
</style>