<template>
  <v-chart class="chart" :option="option" autoresize style="width: 400px; height: 300px;" />
</template>

<script>
import { use } from 'echarts/core';
import { CanvasRenderer } from 'echarts/renderers';
import { PieChart } from 'echarts/charts';
import {
  TitleComponent,
  TooltipComponent,
  LegendComponent,
} from 'echarts/components';
import VChart, { THEME_KEY } from 'vue-echarts';
import { ref } from 'vue';

import { defineComponent } from '@vue/composition-api';


use([
  CanvasRenderer,
  PieChart,
  TitleComponent,
  TooltipComponent,
  LegendComponent,
]);

export default defineComponent({
  name: 'ColumnChart',
  components: {
    VChart,
  },
  provide: {
    [THEME_KEY]: 'dark',
  },
  setup() {
    const option = ref({
      title: {
        text: 'Traffic Sources',
        left: 'center',
      },
      tooltip: {
        trigger: 'item',
        formatter: '{a} <br/>{b} : {c} ({d}%)',
      },
      legend: {
        orient: 'vertical',
        left: 'left',
        data: ['Direct', 'Email', 'Ad Networks', 'Video Ads', 'Search Engines'],
      },
      series: [
        {
          name: 'Traffic Sources',
          type: 'pie',
          radius: '55%',
          center: ['50%', '60%'],
          data: [
            { value: 335, name: 'Direct' },
            { value: 310, name: 'Email' },
            { value: 234, name: 'Ad Networks' },
            { value: 135, name: 'Video Ads' },
            { value: 1548, name: 'Search Engines' },
          ],
          emphasis: {
            itemStyle: {
              shadowBlur: 10,
              shadowOffsetX: 0,
              shadowColor: 'rgba(0, 0, 0, 0.5)',
            },
          },
        },
      ],
    });

    return { option };
  },
});
</script>

<style scoped>
.chart {
  height: 100vh;
}
</style>
