<template>
  <Echart
    ref="chart"
    :options="option"
    height="100%"
    width="100%"/>
</template>
<script>
/**
   * @author 王晓颖
   * @date 2020/08/19
   * @Description 渐变折线图
   * @props 数据格式：{
   *    id: 'traffic_govern_line_id',
      legend:['近一周日均车位占用率','近一周日均车位停车次数'], // 可不传
      xAxisData:['周一','周二','周三','周四','周五','周六','周日'],
      axisData: [
        {name:'近一周日均车位占用率',data:[120, 252, 101, 134, 290, 230, 110],color:'58,55,194'},
        {name:'近一周日均车位停车次数',data:[120, 222, 191, 234, 250, 200, 310],color:'109,202,23'},
      ]
    }
   *
   */
import Echart from '@/common/echart'
import { countSize } from '@/utils/index'
export default {
  name: 'GradientLineChart',
  components: {Echart},
  props: {
    unit: { // 单位
      type: String,
      default: ''
    },
    colors: { // 颜色
      type: Array,
      default: () => { return ['#01b4ff', '#0337ff'] }
    },
    axisLineColor: { // 轴线颜色
      type: String,
      default: '#101d5d'
    },
    fontColor: { // 轴线上文字颜色
      type: String,
      default: '#ffffff'
    },
    labelColor: { // 图形上文本标签颜色
      type: String,
      default: '#47c8b2'
    },
    smooth: {
      type: Boolean,
      default: true
    }, // 平滑
    seriesData: { // 数据
      type: Array,
      default: () => { return [] }
    },
    xAxisData: { // X轴数据
      type: Array,
      default: () => { return [] }
    }
  },
  data () {
    return {
      curWidth: this.width,
      curHeight: this.height,
      option: {
        grid: {
          left: 10,
          right: 30,
          bottom: 5,
          top: 30,
          containLabel: true
        },
        legend: {
          orient: 'horizontal',
          data: [],
          align: 'left',
          right: '5%',
          itemWidth: 12,
          itemHeight: 12,
          icon: 'rect',
          textStyle: {
            width: '300',
            color: '#fff',
            fontSize: 12
          }
        },
        tooltip: {
          trigger: 'axis',
          textStyle: {
            fontSize: '16'
          },
          axisPointer: {
            type: 'cross',
            label: {
              fontSize: '16'
            }
          }
        },
        xAxis: [
          {
            type: 'category',
            boundaryGap: false,
            data: [],
            axisLine: {
              lineStyle: {
                color: this.axisLineColor // 轴线的颜色
              }
            },
            axisLabel: {
              color: this.fontColor, // X轴名称颜色
              fontSize: 14
            }
          }
        ],
        yAxis: [
          {
            name: this.unit,
            type: 'value',
            color: '#fff',
            nameTextStyle: {
              color: '#fff',
              fontSize: 14,
              verticalAlign: 'middle'
            },
            splitLine: {
              lineStyle: {
                color: ['#101641'],
                type: 'dashed'
              }
            },
            axisLine: {
              lineStyle: {
                color: this.axisLineColor
              }
            },
            axisLabel: {
              color: this.fontColor,
              fontSize: 12
            }
          }
        ],

        series: []
      }
    }
  },
  watch: {
    xAxisData (newVal) {
      this.option.xAxis[0].data = newVal
      this.refreshEchart()
    },
    legend (newVal) {
      this.option.legend.data = newVal
      this.refreshEchart()
    },
    unit (newVal) {
      this.option.yAxis[0].name = newVal
      this.refreshEchart()
    },
    seriesData: {
      handler (newVal) {
        let newSeries = []
        for (let item of newVal) {
          let series = {
            name: item.name,
            type: 'line',
            symbol: 'none', // 去掉折线节点
            smooth: this.smooth, // 曲线变平滑
            itemStyle: {
              color: `rgb(${item.color})`
            },
            lineStyle: {
              width: countSize(0.03)
            },
            areaStyle: {
              color: new this.$echarts.graphic.LinearGradient(
                0, 0, 0, 1, // 变化度 //三种由深及浅的颜色
                [
                  {
                    offset: 0.1,
                    color: `rgba(${item.color},.6)`
                  },
                  {
                    offset: 1,
                    color: 'rgba(0,0,0,.0)'
                  }
                ]
              )
            },
            data: item.data
          }
          newSeries.push(series)
        }
        this.$set(this.option, 'series', newSeries)
        this.refreshChart()
      },
      deep: true
    }
  },
  mounted () {
    this.refreshChart()
  },
  methods: {
    refreshChart () {
      this.unit && (this.option.yAxis[0].name = this.unit)
      if (this.xAxisData.length) {
        this.option.legend.data = this.legend
        this.option.xAxis[0].data = this.xAxisData
        let newSeries = []
        for (let item of this.seriesData) {
          let series = {
            name: item.name,
            type: 'line',
            symbol: 'none', // 去掉折线节点
            smooth: this.smooth, // 曲线变平滑
            itemStyle: {
              color: `rgb(${item.color})`
            },
            lineStyle: {
              width: countSize(0.03)
            },
            areaStyle: {
              color: new this.$echarts.graphic.LinearGradient(
                0, 0, 0, 1, // 变化度 //三种由深及浅的颜色
                [
                  {
                    offset: 0.1,
                    color: `rgba(${item.color},.6)`
                  },
                  {
                    offset: 1,
                    color: 'rgba(0,0,0,.0)'
                  }
                ]
              )
            },
            data: item.data
          }
          newSeries.push(series)
        }
        this.$set(this.option, 'series', newSeries)
      }
    }
  }
}
</script>

<style scoped>
</style>