<template>
  <div>
    <div id="main" style="height:350px;width:100%"></div>
  </div>
</template>
<script>
import echarts from 'echarts'
export default {
 data() {
    return {
      ans:[],
      // dayX: [], // 當(dāng)天的 X軸
      weekX: [], // 當(dāng)周的 X軸
      monthX: [], // 當(dāng)月的 X軸
      yearX: [], // 當(dāng)年的 X軸
      timeX:[],//任意時(shí)間段的X軸
      dataY: [] // Y 軸
    }
  },
 created() {
    this.fetchData()
  },
  
methods: {
//獲取數(shù)據(jù)庫(kù)中的數(shù)據(jù)
    fetchData() {
    this.axios({
          method: 'GET',
          url: 'http://localhost:8080/xxxx/xxxx' }).then(function(resp) {
          console.log("oxygen ===>",resp.data)
          let num = resp.data.length //獲取數(shù)組的長(zhǎng)度
          for (let i = 0; i <num; i++) {
            //創(chuàng)建一個(gè)對(duì)象
            let arr = {}
            arr.timeX = resp.data[i].chkDate.slice(5, 10)
            arr.timeY = resp.data[i].oxgnSaturation
            vm.ans.push(arr)

          }

        })
     },
       init(dataX, dataY) {
      this.myChart = echarts.init(document.getElementById('main'))

      let option = {
        legend: {
          icon: 'stack',
          // data: ['當(dāng)天', '當(dāng)月', '當(dāng)年'],
          data: ['當(dāng)周', '當(dāng)月','當(dāng)年','所選時(shí)間段'],
          selectedMode: 'single', // 單選
          selected: {
            當(dāng)周: true,
            當(dāng)月: false,
            當(dāng)年: false,
            所選時(shí)間段: false
          }
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross'
          },
          //自定義顯示標(biāo)簽
          formatter:function(params) {
            return params[0].name + '<br>血氧 : '+params[0].data+' %'
          }
        },
        // 工具欄
        toolbox: {
          feature: {
            saveAsImage: {} //可對(duì)折線圖進(jìn)行截圖保存
          }
        },
        grid: {
          left: 10, //組件距離容器左邊的距離
          right: 10,
          top: 30,
          bottom: 20,
          containLabel: true
        },

        dataZoom: [ //通過(guò)鼠標(biāo)控制折線圖的放大縮小
          {
            show: true,
            type: 'inside',
            filterMode: 'none',
            xAxisIndex: [0]

          },
          {
            show: true,
            type: 'inside',
            filterMode: 'none',
            yAxisIndex: [0]

          }
        ],
        xAxis: {
          type: 'category',
          miniInterval: 3,
          boundaryGap: false,
          axisTick: {
            show: false
          },
          splitLine: {
            // X 軸分隔線樣式
            show: true,
            lineStyle: {
              color: ['#f3f0f0'],
              width: 1,
              type: 'solid'
            }
          },
          data: dataX
        },
        yAxis: [
          {
            name: "血氧趨勢(shì)圖",
            type: 'value',
            splitLine: {
              // Y 軸分隔線樣式
              show: true,
              lineStyle: {
                color: ['#f3f0f0'],
                width: 1,
                type: 'solid'
              }
            }
          }
        ],
        series: dataY

      }
      
  		this.myChart.on('legendselectchanged', obj => {
        var options = this.myChart.getOption()
        //這里是選擇切換什么樣的x軸，那么他會(huì)進(jìn)行對(duì)Y值的切換
        if (obj.name == '當(dāng)周'){
          options.xAxis[0].data = this.weekX
        }else if (obj.name == '當(dāng)月'){
          options.xAxis[0].data = this.monthX
        }else if (obj.name == '當(dāng)年'){
          options.xAxis[0].data = this.yearX
        }else if (obj.name == '所選時(shí)間段'){
          options.xAxis[0].data = this.timeX
        }

        this.myChart.setOption(options, true)
      })

      // 使用剛指定的配置項(xiàng)和數(shù)據(jù)顯示圖表。
      this.myChart.setOption(option)

			
  },
    mounted() {

    setTimeout(() => {
      this.$nextTick(() => {

        this.monthX = (this.res.map(item => item.monthX)).filter(Boolean) //過(guò)濾掉undefined、NaN、null、空串
        this.weekX = (this.res.map(item => item.weekX)).filter(Boolean) //過(guò)濾掉undefined、NaN、null、空串
        this.yearX = (this.res.map(item => item.yearX)).filter(Boolean) //過(guò)濾掉undefined、NaN、null、空串
        this.timeX = (this.ans.map(item => item.timeX)).filter(Boolean) //過(guò)濾掉undefined、NaN、null、空串

        //對(duì)dataY進(jìn)行賦值，如果這里想一個(gè)X軸對(duì)應(yīng)多個(gè)Y值那么可以在加一個(gè){}
        this.dataY.push({
          name: '當(dāng)月',
          type: 'line', // 直線ss
          itemStyle: {
            normal: {
              color: '#2E2E2E',
              lineStyle: {
                color: '#2E2E2E',
                width: 2
              }
            }
          },
          data: this.res.map(item => item.monthY)
        })

        this.dataY.push({ //這邊就可以自定義一個(gè)折線顯示的方式和顏色
          name: '當(dāng)周',
          type: 'line',
          itemStyle: {
            normal: {
              color: '#FF0000',
              lineStyle: {
                color: '#FF0000',
                width: 2
              }
            }
          },
          data: this.res.map(item => item.weekY)
        })


        this.dataY.push({ //這邊就可以自定義一個(gè)折線顯示的方式和顏色
          name: '當(dāng)年', //這個(gè)必須和lengen 那邊的保持一致才行 
          type: 'line',
          itemStyle: {
            normal: {
              color: '#0404B4',
              lineStyle: {
                color: '#0404B4',
                width: 2
              }
            }
          },
          data: this.res.map(item => item.yearY)
        })

        this.dataY.push({ //這邊就可以自定義一個(gè)折線顯示的方式和顏色
          name: '所選時(shí)間段',
          type: 'line',
          itemStyle: {
            normal: {
              color: '#DF01D7',
              lineStyle: {
                color: '#DF01D7',
                width: 2
              }
            }
          },
          data: this.ans.map(item => item.timeY)
        })

        this.init(this.weekX, this.dataY) //初始化的數(shù)據(jù)顯示
        window.onresize = this.myChart.resize //窗口大小圖標(biāo)自適應(yīng)
      })
    }, 1000)
  }
}
</script>