<template>
  <div class="tslyqk_constituent_3d">
    <div class="echarts3D" ref="echarts3D"></div>
    <div class="bg-nopx"></div>
  </div>
</template>

<script setup>
import * as echarts from 'echarts';
const { proxy } = getCurrentInstance();

const myChart = ref(null);

// 生成扇形的曲面参数方程，用于 series-surface.parametricEquation
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;
  // }
  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.sin(midRadian) * 0.1 : 0;
  let offsetY = isSelected ? Math.cos(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;
    },
  };
}
// 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: 1 / 10,
      },
    };

    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: 0.9,
      color: '#296E99',
    },
    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)) / Math.PI) * 2;
      },
      y: function (u, v) {
        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2;
      },
      z: function (u, v) {
        return Math.cos(v) > 0 ? -0.5 : -5;
      },
    },
  });

  // // 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: 0.2,
      color: '#215983',
    },
    parametricEquation: {
      u: {
        min: 0,
        max: Math.PI * 3,
        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)) / Math.PI) * 3;
      },
      y: function (u, v) {
        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 3;
      },
      z: function (u, v) {
        return Math.cos(v) > 0 ? -5 : -7;
      },
    },
  });
  series.push({
    name: 'mouseoutSeries',
    type: 'surface',
    parametric: true,
    wireframe: {
      show: false,
    },
    itemStyle: {
      opacity: 1,
      color: '#25719D',
    },
    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)) / Math.PI) * 2.5;
      },
      y: function (u, v) {
        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2.5;
      },
      z: function (u, v) {
        return Math.cos(v) > 0 ? -7 : -7;
      },
    },
  });

  // 准备待返回的配置项，把准备好的 legendData、series 传入。
  let option = {
    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.value}`;
        }
      },
    },
    //animation: false,
    legend: {
      orient: 'vertical',
      icon: 'circle',
      right: '3%',
      y: 'center',
      show: true,
      itemGap: 15,
      textStyle: {
        color: '#A1E2FF',
        fontSize: 13,
      },
      data: legendData,
      formatter: params => {
        return params;
      },
    },
    xAxis3D: {
      min: -1,
      max: 1,
    },
    yAxis3D: {
      min: -1,
      max: 1,
    },
    zAxis3D: {},
    grid3D: {
      viewControl: {
        autoRotate: true,
        //3d效果可以放大、旋转等，请自己去查看官方配置
        // alpha: 0,
        // beta: 100,
        // rotateSensitivity: 100,
        // zoomSensitivity: 100,
        // panSensitivity: 100,
      },
      top: '-10%',
      left: 'left',
      width: '60%',
      show: false,
      boxHeight: 50,
    },
    series: series,
  };
  return option;
}
// 传入数据生成 option

const initEcharts = () => {
  const optionData = [
    {
      name: '草(17.4k㎡,0.4%)',
      value: 17.4,
      itemStyle: {
        color: '#E7EA39',
      },
    },
    {
      name: '田 (4051.55k㎡,83.3%)',
      value: 4051.55,
      itemStyle: {
        color: '#E89668',
      },
    },
    {
      name: '林 (553.89k㎡,11.4%)',
      value: 553.89,
      itemStyle: {
        color: '#D863F4',
      },
    },
    {
      name: '湖 (78.54k㎡,1.6%)',
      value: 78.54,
      itemStyle: {
        color: '#03BABB',
      },
    },
    {
      name: '水 (165.05k㎡,3.4%)',
      value: 165.05,
      itemStyle: {
        color: '#3EB4F1',
      },
    },
  ];
  // 生成配置选项
  const option = getPie3D(optionData, 0.59);
  myChart.value = echarts.init(proxy.$refs.echarts3D);

  // 绘制图形
  myChart.value.setOption(option);
};

//自适应
function resizeTheChart() {
  if (myChart.value) {
    myChart.value.resize();
  }
}

onMounted(() => {
  initEcharts();
  window.addEventListener('resize', resizeTheChart);
});
</script>

<style lang="scss" scoped>
.tslyqk_constituent_3d {
  width: 100%;
  height: 190px;
  position: relative;
  top: 30px;
  .echarts3D {
    height: 100%;
    height: 190px;
    position: relative;
  }
}
</style>