<template>
  <div ref="echart" class="echartDiv"></div>
</template>
 
<script setup>
import * as echarts from "echarts";
import "echarts-gl";
import { fa } from "element-plus/es/locale.mjs";
import { onMounted, toRefs, ref, reactive } from "vue";
const echart = ref()

// 传入数据生成 option
const optionsData = [
  {
    name: "待办",
    value: 2056,
    itemStyle: {
      // color: "#2A71FF"
      echarts:'rgba(44,44,44,0.8)'
    }
  },
  {
    name: "已办",
    value: 4356,
    itemStyle: {
      color: "#00EDFE"
    }
  },
  {
    name: "未处理",
    value: 3018,
    itemStyle: {
      color: "#FEDB4B"
    }
  },
  {
    name: "忽略",
    value: 1998,
    itemStyle: {
      color: "#FE7C2F"
    }
  }
];

//挂载
onMounted(() => {
  echartInit();
});

const echartInit = () => {
  var myChart = echarts.init(echart.value);
  const series = getPie3D(optionsData, 0.8, 240, 28, 26, 0.5);
  series.push({
    name: "pie2d",
    type: "pie",
    label: {
      // show: false,
      opacity: 1,
      fontSize: 14,
      lineHeight: 20,
      textStyle: {
        fontSize: 14,
        color: "#fff"
      }
    },
    labelLine: {
      // show: false,
      length: 20,
      length2: 25
    },
    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: ["40%", "60%"],
    center: ["40%", "50%"],
    data: optionsData,
    itemStyle: {
      opacity: 0
    }
  });
  // 准备待返回的配置项，把准备好的 legendData、series 传入。
  let option = {
    legend: {
      show: true,
      tooltip: {
        show: true
      },
      orient: "vertical",
      data: ["待办", "已办", "未处理", "忽略"],
      top: "center",
      itemGap: 14,
      itemHeight: 8,
      itemWidth: 17,
      right: "2%",
      textStyle: {
        color: "#fff",
        fontSize: 12
      }
    },
    animation: true,
    tooltip: {
      formatter: (params) => {
        if ( params.seriesName !== "mouseoutSeries" && params.seriesName !== "pie2d") {
          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.value + "人"}`;
        }
      },
      textStyle: {
        fontSize: 14
      }
    },
    title: {
      x: "center",
      top: "20",
      textStyle: {
        color: "#fff",
        fontSize: 22
      }
    },
    backgroundColor: "rgba(0, 29, 75, 0.65)",
    labelLine: {
      show: true,
      lineStyle: {
        color: "#7BC0CB"
      },
      normal: {
        show: false,
        length: 20,
        length2:20
      }
    },
    label: {
      show: true,
      position: "outside",
      formatter: "{b} \n{d}%",
      textStyle: {
        color: "#fff",
        fontSize: "14px"
      }
    },
    xAxis3D: {
      min: -1,
      max: 1
    },
    yAxis3D: {
      min: -1,
      max: 1
    },
    zAxis3D: {
      min: -1,
      max: 1
    },
    grid3D: {
      show: false,
      boxHeight: 0.01,
      bottom: "50%",
      left:'-12%',
      // environment: "rgba(255,255,255,0)",// 环境颜色
      viewControl: {
        distance: 180, //圆环的大小 ,值越大换越小
        alpha: 25, //倾斜的角度
        beta: 0,//旋转的角度
        autoRotate: false // 取消自动旋转
      }
    },
    series: series
  };
  // 使用刚指定的配置项和数据显示图表。
  myChart.setOption(option);
};

function getParametricEquation(startRatio,endRatio,isSelected,isHovered,k,height) {
  // 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);}
      return Math.sin(v) > 0 ? 1 * height : -1;
    }
  };
}
// 生成模拟 3D 饼图的配置项
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,
      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;
    console.log(series[i]);
    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);
  }
  return series;
}
</script>
 
<style lang='scss' scoped>
.echartDiv {
  width: 100%;
  height: 100%;
}
</style>
