<template>
    <div class="mod-demo-echarts">
      <div id="J_chartPieBox" class="chart-box"></div>
    </div>
</template>

<script>
  import * as echarts from 'echarts'
  export default {
    data () {
      return {
        chartPie: null
      }
    },
    mounted () {
      this.initChartPie()
    },
    activated () {
      // 由于给echart添加了resize事件, 在组件激活时需要重新resize绘画一次, 否则出现空白bug
      if (this.chartPie) {
        this.chartPie.resize()
      }
    },
    methods: {
      // 饼状图
      initChartPie () {
        var option = {
          backgroundColor: '#2c343c',
          title: {
            text: 'Customized Pie',
            left: 'center',
            top: 20,
            textStyle: {
              color: '#ccc'
            }
          },
          tooltip: {
            trigger: 'item',
            formatter: '{a} <br/>{b} : {c} ({d}%)'
          },
          visualMap: {
            show: false,
            min: 80,
            max: 600,
            inRange: {
              colorLightness: [0, 1]
            }
          },
          series: [
            {
              name: '访问来源',
              type: 'pie',
              radius: '55%',
              center: ['50%', '50%'],
              data: [
                { value: 335, name: '直接访问' },
                { value: 310, name: '邮件营销' },
                { value: 274, name: '联盟广告' },
                { value: 235, name: '视频广告' },
                { value: 400, name: '搜索引擎' }
              ].sort(function (a, b) { return a.value - b.value }),
              roseType: 'radius',
              label: {
                normal: {
                  textStyle: {
                    color: 'rgba(255, 255, 255, 0.3)'
                  }
                }
              },
              labelLine: {
                normal: {
                  lineStyle: {
                    color: 'rgba(255, 255, 255, 0.3)'
                  },
                  smooth: 0.2,
                  length: 10,
                  length2: 20
                }
              },
              itemStyle: {
                normal: {
                  color: '#c23531',
                  shadowBlur: 200,
                  shadowColor: 'rgba(0, 0, 0, 0.5)'
                }
              },
              animationType: 'scale',
              animationEasing: 'elasticOut',
              animationDelay: function (idx) {
                return Math.random() * 200
              }
            }
          ]
        }
        this.chartPie = echarts.init(document.getElementById('J_chartPieBox'))
        this.chartPie.setOption(option)
        window.addEventListener('resize', () => {
          this.chartPie.resize()
        })
      }
    }
  }
</script>

<style lang="scss">
  .mod-demo-echarts {
    > .el-alert {
      margin-bottom: 10px;
    }
    > .el-row {
      margin-top: -10px;
      margin-bottom: -10px;
      .el-col {
        padding-top: 10px;
        padding-bottom: 10px;
      }
    }
    .chart-box {
      min-height: 120px;
    }
  }
</style>
