Vue Echarts 3D饼图

pie3d_chart() {
      let chartDom = document.getElementById('political_landscape')
      let myChart = echarts.init(chartDom)
      let color = ['#042bb6', '#00d7e9', '#2dd8f4', '#f61e1e']
      let data = this.data
      data.forEach((item, index) => {
        item.itemStyle = {
          color: color[index],
          opacity: 0.9
        }
      })

      function 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 = 1

        // 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
          }
        }
      }

      function 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
          }
          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。
        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 = 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
              }
            }
          },
          {
            name: 'pie2d',
            type: 'pie',
            labelLine: {
              length: 30,
              length2: 30
            },
            startAngle: -30, //起始角度，支持范围[0, 360]。
            clockwise: false, //饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
            radius: ['60%', '60%'],
            center: ['50%', '50%'], //指示线的位置
            data: data,
            itemStyle: {
              opacity: 0
            }
          }
        )

        // 准备待返回的配置项，把准备好的 legendData、series 传入。
        let option = {
          labelLine: {
            show: true,
            lineStyle: {
              // color: '#fff'
            }
          },
          label: {
            show: true,
            position: 'outside',
            formatter: ['{a|{b}}\n{hr|}\n{c|{c}}'].join('\n'),
            rich: {
              hr: {
                backgroundColor: '#fff',
                borderRadius: 5,
                width: 5,
                height: 5,
                padding: [0, -5],
                opacity: 1
              },
              a: {
                fontSize: 14,
                lineHeight: 30,
                color: '#fff',
                opacity: 1,
                padding: [30, 10, 0, 10]
              },
              c: {
                fontSize: 14,
                color: '#fff',
                opacity: 1,
                padding: [5, 10, 10, 10]
              }
            }
          },
          xAxis3D: {
            min: -1,
            max: 1
          },
          yAxis3D: {
            min: -1,
            max: 1
          },
          zAxis3D: {
            min: -1,
            max: 1
          },
          grid3D: {
            show: false,
            boxHeight: 20,
            //boxWidth: 40,
            viewControl: {
              //3d效果可以放大、旋转等，请自己去查看官方配置
              alpha: 30,
              beta: 40,
              distance: 230,
              rotateSensitivity: 0,
              zoomSensitivity: 0,
              panSensitivity: 0,
              autoRotate: false
            }
          },
          series: series
        }
        return option
      }

      let option = getPie3D(data, 0.71)
      if (option && typeof option === 'object') {
        myChart.setOption(option)
      }
      window.addEventListener('resize', () => {
        myChart.resize()
      })
    }