39、3D饼图

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3.png

4.png 1、饼图封装

  <div>
    <div class="pie" ref="3dpie"></div>
  </div>
</template>
<script>
import "./echarts-gl.min";
export default {
  data() {
    return {
      myChart: null
    };
  },
  created() {},
  computed: {},
  mounted() {
    this.$nextTick(() => {
      this.echartsPie();
    });
  },
  methods: {
    echartsPie() {
      let chartDom = this.$refs["3dpie"];
      this.myChart = this.$echarts.init(chartDom);

      function getParametricEquation(
        startRatio,
        endRatio,
        isSelected,
        isHovered,
        k,
        h,
        i
      ) {
        // 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) * 0.3 : 0;
        let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;
        let offsetZ = i == 1 ? 2 : 0;
        console.log("offsetX", i, offsetX, offsetY);
        // 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 offsetZ + Math.sin(u);
            }
            if (u > Math.PI * 2.5) {
              return offsetZ + Math.sin(u);
            }
            // 调整扇形高度
            return offsetZ + (Math.sin(v) > 0 ? 0.1 * h : -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;

          series[i].pieData.startRatio = startValue / sumValue;
          series[i].pieData.endRatio = endValue / sumValue;
          series[i].parametricEquation = getParametricEquation(
            series[i].pieData.startRatio,
            series[i].pieData.endRatio,
            true,
            false,
            k,
            // 调整扇形高度
            i === 0 ? 10 : 10,
            i
          );

          startValue = endValue;

          legendData.push(series[i].name);
        }


        let values = []
        pieData.forEach(item=>{
            values.push(item.value)
        })
        // 是否需要label指引线。
        series.push({
        name: "pie3d",
        type: "pie",
        label: {
          opacity: 1,
          fontSize: 12,
          lineHeight: 5,
          color: "#000"
        },
        labelLine: {
          length: 20,
          length2: 45
        },
        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: ["15%", "24%"],
        center: ["58%", "52%"], //指示线的位置
        data: values,
        itemStyle: {
          opacity: 0
        }
      });

        // 准备待返回的配置项,把准备好的 legendData、series 传入。
       let option = {
          //animation: false,
          legend: {
            show: false,
            data: legendData
          },
          // 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}`;
          //         }
          //     }
          // },
           labelLine: {
            show: true,
            lineStyle: {
              color: "#000"
            }
          },
          label: {
            show: true,
            position: "outside",
            formatter: "{b} \n{c} {d}%"
          },
          xAxis3D: {
            min: -1,
            max: 1
          },
          yAxis3D: {
            min: -1,
            max: 1
          },
          zAxis3D: {
            min: -1,
            max: 1
          },
          grid3D: {
            show: false,
            boxHeight: 16,
            left: "5%",
            bottom: "0%",
            viewControl: {
              //3d效果可以放大、旋转等,请自己去查看官方配置
              alpha: 20,
              // 饼块开始得角度
              beta: -10,
              rotateSensitivity: 1,
              zoomSensitivity: 0,
              panSensitivity: 0,
              autoRotate: false,
              distance: 300
              //   autoRotateSpeed: 5,
              //   autoRotateAfterStill: 10
            }
          },
          series: series
        };
        return option;
      }

      // 传入数据生成 option
      let option = getPie3D(
        [
          {
            name: "a",
            value: 5,
            itemStyle: {
              opacity: 0.8,
              color: "rgb(19,176,255)"
            }
          },
          {
            name: "b",
            value: 2,
            itemStyle: {
              opacity: 0.8,
              color: "rgb(255,175,2)"
            }
          }
        ],
        0
      );
      option && this.myChart.setOption(option);
    }
  }
};
</script>
<style lang="less" scoped>
.pie{
  //  style="width: 480px; height: 210px;"
    .px2vw(width, 340);
    .px2vh(height, 180);
    // background-color: rgba(55, 143, 226,.5)
}

</style>

2、使用

 <pie3D></pie3D>