vue3之echarts3D环柱饼图

vue3之echarts3D环柱饼图

效果：

版本
"echarts": "^5.4.1", "echarts-gl": "^2.0.9"

核心代码：

<template>
    <div class="content">
        <div ref="eCharts" class="chart"></div>
    </div>
</template>

<script setup>
import { onMounted, ref } from "vue";
import * as echarts from "echarts";
import "echarts-gl";

const eCharts = ref(null);
let myChart = null;

let boxHeight;
let optionData = ref([
  {
    name: "林地",
    value: 5,
    itemStyle: {
      color: "#22c4ff",
    },
  },
  {
    name: "草地",
    value: 13,
    itemStyle: {
      color: "#aaff00",
    },
  },
  {
    name: "耕地",
    value: 38,
    itemStyle: {
      color: "#bbaaf1",
    },
  },
]);

const 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;
    },
  };
};

const getPie3D = (pieData, internalDiameterRatio) => {
  // internalDiameterRatio:透明的空心占比
  let series = [];
  let sumValue = 0;
  let startValue = 0;
  let endValue = 0;

  let k = 1 - internalDiameterRatio;
  pieData.sort((a, b) => {
    return b.value - a.value;
  });
  // 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,
      },
      center: ["10%", "50%"],
    };

    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 // 控制各模块高度一致100   控制各模块高度根据value改变
    );
    startValue = endValue;
  }
  boxHeight = getHeight3D(series, 26); //通过传参设定3d饼/环的高度，26代表26PX
  return series;
};

const getHeight3D = (series, height) => {
  series.sort((a, b) => {
    return b.pieData.value - a.pieData.value;
  });
  return (height * 25) / series[0].pieData.value;
};

const initCharts = () => {
  myChart = echarts.init(eCharts.value);
  const series = getPie3D(optionData.value, 0);
  series.push({
    name: "pie2d",
    type: "pie",
    label: {
      opacity: 1,
      fontSize: 28,
      lineHeight: 20,
    },
    labelLine: {
      length: 20,
      length2: 50,
    },
    startAngle: -40, //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: ["50%", "32%"],
    center: ["50%", "50%"],
    data: optionData.value,
    itemStyle: {
      opacity: 0,
    },
  });
  optionData.value.forEach((item) => {
    item.label = {
      color: item.itemStyle.color,
      show: true,
      formatter: (item) => {
        return `{b|${item.name} \n}`;
      },
      rich: {
        b: {
          fontSize: 16,
          lineHeight: 20,
        },
      },
    };
  });
  let option = {
    xAxis3D: {
      min: -1,
      max: 1,
    },
    yAxis3D: {
      min: -1,
      max: 1,
    },
    zAxis3D: {
      min: -1,
      max: 1,
    },
    grid3D: {
      show: false,
      top: 0, // 距离上边的间距
      boxHeight, // 圆环的高度
      viewControl: {
        // 3d效果可以放大、旋转等，请自己去查看官方配置
        alpha: 22, // 角度
        distance: 400, // 调整视角到主体的距离，类似调整zoom
        rotateSensitivity: 0, // 设置为0无法旋转
        zoomSensitivity: 0, // 设置为0无法缩放
        panSensitivity: 0, // 设置为0无法平移
        autoRotate: false, // 自动旋转
      },
    },
    series,
  };
  myChart?.setOption(option);
};

onMounted(() => {
  initCharts();
});
</script>

<style lang="scss" scoped>
.content {
    position: relative;

    .chart {
      position: absolute;
      top: -20px;
      left: -20px;
      width: 500px;
      height: 300px;
    }
}
</style>