echarts可以轮播的横向柱状图

<template>
  <div class="com-container">
    <div class="com-chart" ref="seller_ref"></div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      chartInstance: null, // echarts实例对象
      allData: [], // 服务器获取的所有数据
      currentPage: 1, // 当前页数
      totalPage: 0, // 总页数
      timerId: null // 定时器标识
    }
  },
  mounted () {
    this.initChart()
    this.getData()
    this.screenAdapter()
    window.addEventListener('resize', this.screenAdapter)
  },
  destroyed () {
    clearInterval(this.timerId)
    window.removeEventListener('resize', this.screenAdapter)
  },
  methods: {
    initChart () {
      // 初始化echarts实例对象
      this.chartInstance = this.$echarts.init(this.$refs.seller_ref, 'dark')
      // this.chartInstance = this.$echarts.init(this.$refs.seller_ref, 'vintage')
      const option = {
        xAxis: {
          type: 'value'
        },
        yAxis: {
          type: 'category'
        },
        title: {
          text: '▎ 商家销量排行',
          left: 20,
          top: 20,
          textStyle: {
            color: '#fff',
            fontSize: 66
          }
        },
        grid: {
          top: '20%',
          left: '3%',
          right: '6%',
          bottom: '3%',
          containLabel: true
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'line',
            z: 1,
            lineStyle: {
              width: 66,
              color: '#2D3443'
            }
          }
        },
        series: [{
          type: 'bar',
          label: {
            show: true,
            position: 'right',
            textStyle: {
              color: '#fff'
            }
          },
          barWidth: 66,
          itemStyle: {
            barBorderRadius: [0, 33, 33, 0],
            color: new this.$echarts.graphic.LinearGradient(0, 0, 1, 0, [
              {
                offset: 0,
                color: '#5052EE'
              }, {
                offset: 1,
                color: '#AB6EE5'
              }
            ])
          }

        }]
      }
      this.chartInstance.setOption(option)
      this.chartInstance.on('mouseover', () => {
        clearInterval(this.timerId)
      })
      this.chartInstance.on('mouseout', () => {
        this.startInterval()
      })
    },
    async getData () {
      // 获取数据
      const {
        data: res
      } = await this.$http.get('seller')
      console.log(res)
      this.allData = res
      // 从大道小的排序
      this.allData.sort((a, b) => {
        return a.value - b.value
      })
      // 计算总页数
      this.totalPage = this.allData.length % 5 ? this.allData.length / 5 : this.allData.length / 5 + 1
      this.updateChart()
      // 开启轮播
      this.startInterval()
    },
    updateChart () {
      const start = (this.currentPage - 1) * 5
      const end = this.currentPage * 5
      const showData = this.allData.slice(start, end)
      // 处理数据并且更新界面图表
      const sellerNames = showData.map(item => item.name)
      const sellerValues = showData.map(item => item.value)
      const option = {
        xAxis: {
          // 设置最大值
          max: this.allData[this.allData.length - 1].value
        },
        yAxis: {
          data: sellerNames
        },
        series: [{
          data: sellerValues
        }]
      }
      this.chartInstance.setOption(option)
    },
    startInterval () {
      if (this.timerId) {
        clearInterval(this.timerId)
      }
      this.timerId = setInterval(() => {
        this.currentPage++
        if (this.currentPage > this.totalPage) {
          this.currentPage = 1
        }
        this.updateChart()
      }, 3000)
    },
    screenAdapter () {
      const titleFontSize = this.$refs.seller_ref.offsetWidth / 100 * 3.6
      const option = {
        title: {
          textStyle: {
            fontSize: titleFontSize
          }
        },
        tooltip: {
          axisPointer: {
            lineStyle: {
              width: titleFontSize
            }
          }
        },
        series: [
          {
            barWidth: titleFontSize,
            itemStyle: {
              barBorderRadius: [0, titleFontSize / 2,
                titleFontSize / 2, 0]
            }
          }
        ]
      }
      this.chartInstance.setOption(option)
      this.chartInstance.resize()
    }

  }
}

</script>

<style scoped>

</style>

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