echarts3d饼图实现

一、vue中使用3d饼图

效果图:

二、使用步骤 

1.引入库

安装echarts

在package.json文件中添加

 "dependencies": {
 	"echarts": "^5.1.2"
 	"echarts-gl": "^1.1.0",
 	//  "echarts-gl": "^2.0.8"
 },
npm install [email protected] --save

2.使用

完整代码如下(示例):

HTML代码

<template>
    <div :class="className" :style="{height:height,width:width,backgroundImage:'url(' +  require('@/assets/bigScreen/deviceBg.png')  + ')'}"/>
  </template>

js脚本代码

<script>
    import "echarts-gl";
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme
    export default {
        props: {
            className: {
            type: String,
                default: 'chart'
            },
            width: {
            type: String,
            default: '50%'
            },
            height: {
            type: String,
            default: '300px'
            },
            optionTest:{}
        },
      data() {
        return {
          myChart: null,
          seriesData: [],
        };
      },
      mounted() {
        this.getList();
        window.addEventListener("resize", () => {
          this.reloadChart();
        });
      },
      methods: {
        getList() {
          this.seriesData = [
            {
              name: "canshu1",
              value: 58,
            },
            {
              name: "canshu2",
              value: 3,
            },
            {
              name: "canshu3",
              value: 15,
            },
            {
              name: "canshu4",
              value: 30,
            },
          ];
          this.initChart(this.seriesData);
        },
        initChart(data) {
          if (data.length == 0) return;
        //   this.myChart = this.$echarts.init(this.$refs.myChart);
          this.myChart = echarts.init(this.$el, 'macarons')
          let colors = [
            "RGBA(36, 154, 163, 1)",
            "RGBA(245, 169, 64, 1)",
            "RGBA(240, 136, 64, 1)",
            "RGBA(123, 198, 239, 1)",
            "RGBA(245, 169, 64, 1)",
            "RGBA(240, 136, 64, 1)",
            "RGBA(123, 198, 239, 1)",
          ];
          const getPie3D = (pieData, internalDiameterRatio) => {
            //internalDiameterRatio:透明的空心占比
            let series = [];
            let sumValue = 0;
            let startValue = 0;
            let endValue = 0;
            let k = 1 - internalDiameterRatio;
            pieData.sort((a, b) => {
              return b.value - a.value;
            });
            // 为每一个饼图数据,生成一个 series-surface 配置
            for (let i = 0; i < pieData.length; i++) {
              sumValue += pieData[i].value;
              let seriesItem = {
                name:
                  typeof pieData[i].name === "undefined"
                    ? `series${i}`
                    : pieData[i].name,
                type: "surface",
                parametric: true,
                wireframe: {
                  show: false,
                },
                pieData: pieData[i],
                pieStatus: {
                  selected: false,
                  hovered: false,
                  k: k,
                },
                radius: "20%",
                center: ["10%", "20%"],
              };
              if (typeof colors[i] != "undefined") {
                let itemStyle = {};
                typeof colors[i] != "undefined"
                  ? (itemStyle.color = colors[i])
                  : 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;
            }
            // let boxHeight = getHeight3D(series, 15); //通过传参设定3d饼/环的高度,26代表26px
            // 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: "#7BC0CB",
                },
              },
              legend: {
                orient: "vertical",
                top: "center",
                right: this.fontSize(0.1),
                data: data,
                icon: "circle",
                itemWidth: this.fontSize(0.13), //矩形宽度
                itemHeight: this.fontSize(0.13), //矩形高度
                formatter: (res) => {
                  let str = "";
                  series.forEach((ele) => {
                    if (res == ele.name) {
                      let bfb = (
                        (ele.pieData.endRatio - ele.pieData.startRatio) *
                        100
                      ).toFixed(2);
                      if (bfb == "NaN") {
                        str =
                          "{e|" +
                          ele.pieData.name +
                          "}" +
                          "{a|" +
                          ele.pieData.value +
                          "  " +
                          0 +
                          "%}";
                      } else {
                        str =
                          "{e|" +
                          ele.pieData.name +
                          "} " +
                          "{a| " +
                          ele.pieData.value +
                          "}{b|  " +
                          bfb +
                          "%}";
                      }
                    }
                  });
                  return str;
                },
                textStyle: {
                  color: "#fff",
                  fontSize: this.fontSize(0.35),
                  padding: [5, 0],
                  rich: {
                    a: {
                      fontSize: this.fontSize(0.35),
                      color: "#00DCF6",
                      // width: this.fontSize(0.5),
                    },
                    b: {
                      fontSize: this.fontSize(0.35),
                      color: "#00DCF6",
                      // width: this.fontSize(0.85),
                    },
                    e: {
                      fontSize: this.fontSize(0.35),
                      // width: this.fontSize(1.0),
                    },
                  },
                },
              },
              label: {
                show: false,
                formatter: "",
              },
              tooltip: {
                show: true,
                formatter: (params) => {
                  if (
                    params.seriesName !== "mouseoutSeries" &&
                    params.seriesName !== "pie2d"
                  ) {
                    let bfb = (
                      (option.series[params.seriesIndex].pieData.endRatio -
                        option.series[params.seriesIndex].pieData.startRatio) *
                      100
                    ).toFixed(2);
                    return (
                      `${params.seriesName}<br/>` +
                      `<span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color};"></span>` +
                      `${bfb}%`
                    );
                  }
                },
              },
              xAxis3D: {
                min: -1,
                max: 1,
              },
              yAxis3D: {
                min: -1,
                max: 1,
              },
              zAxis3D: {
                min: -1,
                max: 1,
              },
              grid3D: {
                show: false,
                boxHeight: 10, //圆环的高度
                left: -this.fontSize(2.2),
                top: -this.fontSize(0.1), //3d饼图的位置
                viewControl: {
                  //3d效果可以放大、旋转等,请自己去查看官方配置
                  alpha: 25, //角度
                  distance: 200, //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: series,
            };
            return option;
          };
    
          //获取3d丙图的最高扇区的高度
          // const getHeight3D = (series, height) => {
          //   series.sort((a, b) => {
          //     return b.pieData.value - a.pieData.value;
          //   });
          //   return (height * this.fontSize(1)) / series[0].pieData.value;
          // };
    
          // 生成扇形的曲面参数方程,用于 series-surface.parametricEquation
          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;
              },
            };
          };
          let option = getPie3D(data, 0.8);
          //是否需要label指引线,如果要就添加一个透明的2d饼状图并调整角度使得labelLine和3d的饼状图对齐,并再次setOption
          option.series.push({
            name: "pie2d",
            type: "pie",
            labelLine: {
              show: false,
              length: 15,
              length2: 15,
            },
            startAngle: -this.fontSize(0.3), //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: [this.fontSize(1.3) + "%", this.fontSize(1.4) + "%"],
            center: [this.fontSize(1.5) + "%", this.fontSize(1.8) + "%"], //指示线的位置
            data: data,
            itemStyle: {
              opacity: 0,
            },
          });
          this.myChart.setOption(option);
        },
        // 字体自适应。
        fontSize(res) {
          const clientWidth =
            window.innerWidth ||
            document.documentElement.clientWidth ||
            document.body.clientWidth;
          if (!clientWidth) return;
          const fontSize = 40 * (clientWidth / 1920);
          return res * fontSize;
        },
      },
    
      //重新加载图表
      reloadChart() {
        this.disposeChart();
        this.initChart(this.seriesData);
      },
      //销毁图表以及重置各个数据
      disposeChart() {
        if (this.myChart) {
          this.myChart.dispose();
        }
      },
    
      beforeDestroy() {
        this.disposeChart();
      },
    };
    </script>

三、会旋转的3D饼图

<template>
            <div class="chart" ref="myLineChart" id="charts" :style="{height:height,width:width,border:border,backgroundImage:'url(' + require('@/assets/images/chart_opacity_bg.png') + ')',backgroundRepeat:'no-repeat',backgroundPosition:'center center'}"></div> 
            </div>
	<!-- 饼图 -->
    <!-- <div class="container">
            <div class="chartsGl" id="charts"></div>
             <div class="buttomCharts"></div>
        </div> -->
    
</template>
<script>
 
import "echarts-gl";
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme
export default {
props: {
        className: {
        type: String,
            default: 'chart'
        },
        width: {
        type: String,
        default: '30%'
        },
        height: {
        type: String,
        default: '300px'
        },
        border: {
        type: String,
        default: '1px solid red'
        },
        optionTest:{}
    },
 
data() {
 return {
      myChart: null,
optionData:[
 {
     "name": "病区四",
     "value": 80,
 },
 {
     "name": "病区一",
     "value": 200,
 },
 {
     "name": "病区三",
     "value": 20,
 },
 {
     "name": "病区二",
     "value": 400,
 },
 {
     "name": "病区五",
     "value": 500,
 },
 {
     "name": "病区66",
     "value": 590,
 }
]
 }
},
mounted() {
 this.init()
},
methods: {
 //初始化构建
 init() {
 this.myChart = echarts.init(this.$el, 'macarons')
//  this.myChart = echarts.init(document.getElementById('charts'));
   // 传入数据生成 option ; getPie3D(数据,透明的空心占比(调节中间空心范围的0就是普通饼1就很镂空))
   this.option = this.getPie3D(this.optionData, 0.85);
   //将配置项设置进去
   this.myChart.setOption(this.option);
   //鼠标移动上去特效效果
   this.bindListen(this.myChart);
 },
 // 监听鼠标事件,实现饼图选中效果(单选),近似实现高亮(放大)效果。
 bindListen(myChart) {
   let that = this;
   let selectedIndex = '';
   let hoveredIndex = '';
   // 监听点击事件,实现选中效果(单选)
   myChart.on('click', function (params) {
     // 从 option.series 中读取重新渲染扇形所需的参数,将是否选中取反。
     let isSelected = !that.option.series[params.seriesIndex].pieStatus.selected;
     let isHovered = that.option.series[params.seriesIndex].pieStatus.hovered;
     let k = that.option.series[params.seriesIndex].pieStatus.k;
     let startRatio = that.option.series[params.seriesIndex].pieData.startRatio;
     let endRatio = that.option.series[params.seriesIndex].pieData.endRatio;
     // 如果之前选中过其他扇形,将其取消选中(对 option 更新)
     if (selectedIndex !== '' && selectedIndex !== params.seriesIndex) {
       that.option.series[selectedIndex].parametricEquation = that.getParametricEquation(that.option.series[
           selectedIndex].pieData
           .startRatio, that.option.series[selectedIndex].pieData.endRatio, false, false, k, that.option.series[
           selectedIndex].pieData
           .value);
       that.option.series[selectedIndex].pieStatus.selected = false;
     }
     // 对当前点击的扇形,执行选中/取消选中操作(对 option 更新)
     that.option.series[params.seriesIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
         isSelected,
         isHovered, k, that.option.series[params.seriesIndex].pieData.value);
     that.option.series[params.seriesIndex].pieStatus.selected = isSelected;
     // 如果本次是选中操作,记录上次选中的扇形对应的系列号 seriesIndex
     isSelected ? selectedIndex = params.seriesIndex : null;
     // 使用更新后的 option,渲染图表
     myChart.setOption(that.option);
   });
   // 监听 mouseover,近似实现高亮(放大)效果
   myChart.on('mouseover', function (params) {
     // 准备重新渲染扇形所需的参数
     let isSelected;
     let isHovered;
     let startRatio;
     let endRatio;
     let k;
     // 如果触发 mouseover 的扇形当前已高亮,则不做操作
     if (hoveredIndex === params.seriesIndex) {
       return;
       // 否则进行高亮及必要的取消高亮操作
     } else {
       // 如果当前有高亮的扇形,取消其高亮状态(对 option 更新)
       if (hoveredIndex !== '') {
         // 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 false。
         isSelected = that.option.series[hoveredIndex].pieStatus.selected;
         isHovered = false;
         startRatio = that.option.series[hoveredIndex].pieData.startRatio;
         endRatio = that.option.series[hoveredIndex].pieData.endRatio;
         k = that.option.series[hoveredIndex].pieStatus.k;
         // 对当前点击的扇形,执行取消高亮操作(对 option 更新)
         that.option.series[hoveredIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
             isSelected,
             isHovered, k, that.option.series[hoveredIndex].pieData.value);
         that.option.series[hoveredIndex].pieStatus.hovered = isHovered;
         // 将此前记录的上次选中的扇形对应的系列号 seriesIndex 清空
         hoveredIndex = '';
       }
       // 如果触发 mouseover 的扇形不是透明圆环,将其高亮(对 option 更新)
       if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {
         // 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 true。
         isSelected = that.option.series[params.seriesIndex].pieStatus.selected;
         isHovered = true;
         startRatio = that.option.series[params.seriesIndex].pieData.startRatio;
         endRatio = that.option.series[params.seriesIndex].pieData.endRatio;
         k = that.option.series[params.seriesIndex].pieStatus.k;
         // 对当前点击的扇形,执行高亮操作(对 option 更新)
         that.option.series[params.seriesIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
             isSelected, isHovered, k, that.option.series[params.seriesIndex].pieData.value + 5);
         that.option.series[params.seriesIndex].pieStatus.hovered = isHovered;
         // 记录上次高亮的扇形对应的系列号 seriesIndex
         hoveredIndex = params.seriesIndex;
       }
       // 使用更新后的 option,渲染图表
       myChart.setOption(that.option);
     }
   });
   // 修正取消高亮失败的 bug
   myChart.on('globalout', function () {
     // 准备重新渲染扇形所需的参数
     let isSelected;
     let isHovered;
     let startRatio;
     let endRatio;
     let k;
     if (hoveredIndex !== '') {
       // 从 option.series 中读取重新渲染扇形所需的参数,将是否高亮设置为 true。
       isSelected = that.option.series[hoveredIndex].pieStatus.selected;
       isHovered = false;
       k = that.option.series[hoveredIndex].pieStatus.k;
       startRatio = that.option.series[hoveredIndex].pieData.startRatio;
       endRatio = that.option.series[hoveredIndex].pieData.endRatio;
       // 对当前点击的扇形,执行取消高亮操作(对 option 更新)
       that.option.series[hoveredIndex].parametricEquation = that.getParametricEquation(startRatio, endRatio,
           isSelected,
           isHovered, k, that.option.series[hoveredIndex].pieData.value);
       that.option.series[hoveredIndex].pieStatus.hovered = isHovered;
       // 将此前记录的上次选中的扇形对应的系列号 seriesIndex 清空
       hoveredIndex = '';
     }
     // 使用更新后的 option,渲染图表
     myChart.setOption(that.option);
   });
 },
 getPie3D(pieData, internalDiameterRatio) {
   let that = this;
   let series = [];
   let sumValue = 0;
   let startValue = 0;
   let endValue = 0;
   let legendData = [];
   let legendBfb = [];
   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(参数曲面) 配置
   for (let i = 0; i < pieData.length; i++) {
     sumValue += pieData[i].value;
     let seriesItem = {
       //系统名称
       name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,
       type: 'surface',
       //是否为参数曲面(是)
       parametric: true,
       //曲面图网格线(否)上面一根一根的
       wireframe: {
         show: false
       },
       pieData: pieData[i],
       pieStatus: {
         selected: false,
         hovered: false,
         k: k
       },
     };
     //曲面的颜色、不透明度等样式。
     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。
   legendData = [];
   legendBfb = [];
   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 = this.getParametricEquation(series[i].pieData.startRatio, series[i].pieData.endRatio,
         false, false, k, series[i].pieData.value);
     startValue = endValue;
     let bfb = that.fomatFloat(series[i].pieData.value / sumValue, 4);
     legendData.push({
       name: series[i].name,
       value: bfb
     });
     legendBfb.push({
       name: series[i].name,
       value: bfb
     });
   }
   //(第二个参数可以设置你这个环形的高低程度)
   let boxHeight = this.getHeight3D(series, 15);//通过传参设定3d饼/环的高度
   // 准备待返回的配置项,把准备好的 legendData、series 传入。
   let option = {
     //图例组件
     legend: {
       data: legendData,
       //图例列表的布局朝向。vertical
       orient: 'horizontal',
       type: 'scroll',
       left: '0%',
       bottom:'5%',
       //图例文字每项之间的间隔
       itemGap: 0,
       textStyle: {
         color: 'black',
         fontSize: '0.5rem',
       },
       show: true,
       icon: "circle",
       //格式化图例文本(我是数值什么显示什么)
       formatter: function (name) {
         var target;
         for (var i = 0, l = pieData.length; i < l; i++) {
           if (pieData[i].name == name) {
             target = pieData[i].value;
           }
         }
         return `${name}: ${target}`;
       },
       // 这个可以显示百分比那种(可以根据你想要的来配置)
         formatter: function(param) {
             let item = legendBfb.filter(item => item.name == param)[0];
             let bfs = that.fomatFloat(item.value * 100, 2) + "%";
             console.log(item.name)
             return `${item.name} :${bfs}`;
         }
     },
     //移动上去提示的文本内容
     tooltip: {
       formatter: params => {
         if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {
           let bfb = ((option.series[params.seriesIndex].pieData.endRatio - option.series[params.seriesIndex].pieData.startRatio) *
               100).toFixed(2);
           return `${params.seriesName}<br/>` +
               `<span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color};"></span>` +
               `${bfb}`;
         }
       }
     },
     //这个可以变形
     xAxis3D: {
       min: -0.8,
       max: 1
     },
     yAxis3D: {
       min: -1,
       max: 1
     },
     zAxis3D: {
       min: -1,
       max: 1
     },
     //此处是修改样式的重点
     grid3D: {
       show: false,
       boxHeight: boxHeight, //圆环的高度
       //这是饼图的位置
       top: '-10%',
       viewControl: { //3d效果可以放大、旋转等,请自己去查看官方配置
         alpha: 35, //角度(这个很重要 调节角度的)
         distance: 165,//调整视角到主体的距离,类似调整zoom(这是整体大小)
         rotateSensitivity: 1, //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: series
   };
   return option;
 },
 getHeight3D(series, height) {
   series.sort((a, b) => {
     return (b.pieData.value - a.pieData.value);
   })
   return height * 25 / series[0].pieData.value;
 },
 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 * .1;
       }
       return Math.sin(v) > 0 ? 1 * h * .1 : -1;
     }
   };
 },
 fomatFloat(num, n) {
   var f = parseFloat(num);
   if (isNaN(f)) {
     return false;
   }
   f = Math.round(num * Math.pow(10, n)) / Math.pow(10, n); // n 幂
   var s = f.toString();
   var rs = s.indexOf('.');
   //判定如果是整数,增加小数点再补0
   if (rs < 0) {
     rs = s.length;
     s += '.';
   }
   while (s.length <= rs + n) {
     s += '0';
   }
   return s;
 },
},
}
</script>

<style>

    .chart{
        background-size: 60% 60%;
        /* background:rgba(34,34,34,0.5); */
    }

 
</style>

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转载自blog.csdn.net/askuld/article/details/131831442