VUE 中 Echarts折线堆叠图 线条可以上下拖动 显示实时数据

想要实现的效果： Echarts折线堆叠图中有曲线和一条直线，要求上下拖动这条直线实时显示数据，直线是因为后端返回的接口里数值都是一样的就是直线了，

if (this.analysisModel.amplificationData.amplificationParam.graphType === '1') {
        for (let i = 0; i < thresholdLineData.length; i++) {
          let thresholdArr = thresholdLineData[i].split('|')
          let thr = []
          for (let j = 0; j < this._CycleCount; j++) {
            console.log(this._CycleCount);
            thr.push(thresholdArr[0])
          }
          let color = 'blue'
          if (thresholdArr[1] === '0') {
            color = '#1E90FF'
          } else if (thresholdArr[1] === '1') {
            color = '#FFD700'
          } else if (thresholdArr[1] === '2') {
            color = '#90EE90'
          } else if (thresholdArr[1] === '3') {
            color = '#FF4500'
          }
          let series = {
            name: '阈值线',
            type: 'line',
            data: thr,
            showSymbol: false,
            showAllSymbol: false,
            sampling: 'average',//降采样策略,
            itemStyle : {
              normal : {
                color: color,
                lineStyle:{
                  color: color,
                  width: 2
                }
              }
            },
          }
          seriesData.push(series)
        }
      }