text: import React,  { Component } from 'react';
  import { Chart, Geom, Axis, Tooltip, Coord, Label, Legend, View, Guide, Shape } from 'bizcharts';
  import DataSet from '@antv/data-set';
  
  
  const data = [
    {year: '2001', population: 41.8 },
    {year: '2002', population: 38 },
    {year: '2003', population: 33.7 },
    {year: '2004', population: 30.7 },
    {year: '2005', population: 25.8 },
    {year: '2006', population: 31.7 },
    {year: '2007', population: 33 },
    {year: '2008', population: 46 },
    {year: '2009', population: 38.3 },
    {year: '2010', population: 28 },
    {year: '2011', population: 42.5 },
    {year: '2012', population: 30.3 }
  ];
  
  export default class PieC extends Component {
    
    render() {
      return (
        <Chart height={window.innerHeight} data={data} forceFit>
          <Coord type='polar' />
          <Tooltip />
          <Geom
            type="interval"
            position="year*population"
            style={{lineWidth: 1,stroke: '#fff'}}
            >
          </Geom>
        </Chart>
      );
    }
  }
  