const spec = {
  type: 'line',
  data: {
    values: [
      {
        medalType: 'Gold Medals',
        count: 40,
        year: '1952'
      },
      {
        medalType: 'Gold Medals',
        count: 32,
        year: '1956'
      },
      {
        medalType: 'Gold Medals',
        count: 34,
        year: '1960'
      },
      {
        medalType: 'Gold Medals',
        count: 36,
        year: '1964'
      },
      {
        medalType: 'Gold Medals',
        count: 45,
        year: '1968'
      },
      {
        medalType: 'Gold Medals',
        count: 33,
        year: '1972'
      },
      {
        medalType: 'Gold Medals',
        count: 34,
        year: '1976'
      },
      {
        medalType: 'Gold Medals',
        count: null,
        year: '1980'
      },
      {
        medalType: 'Gold Medals',
        count: 83,
        year: '1984'
      },
      {
        medalType: 'Gold Medals',
        count: 36,
        year: '1988'
      },
      {
        medalType: 'Gold Medals',
        count: 37,
        year: '1992'
      },
      {
        medalType: 'Gold Medals',
        count: 44,
        year: '1996'
      },
      {
        medalType: 'Gold Medals',
        count: 37,
        year: '2000'
      },
      {
        medalType: 'Gold Medals',
        count: 35,
        year: '2004'
      },
      {
        medalType: 'Gold Medals',
        count: 36,
        year: '2008'
      },
      {
        medalType: 'Gold Medals',
        count: 46,
        year: '2012'
      },
      {
        medalType: 'Silver Medals',
        count: 19,
        year: '1952'
      },
      {
        medalType: 'Silver Medals',
        count: 25,
        year: '1956'
      },
      {
        medalType: 'Silver Medals',
        count: 21,
        year: '1960'
      },
      {
        medalType: 'Silver Medals',
        count: 26,
        year: '1964'
      },
      {
        medalType: 'Silver Medals',
        count: 28,
        year: '1968'
      },
      {
        medalType: 'Silver Medals',
        count: 31,
        year: '1972'
      },
      {
        medalType: 'Silver Medals',
        count: 35,
        year: '1976'
      },
      {
        medalType: 'Silver Medals',
        count: null,
        year: '1980'
      },
      {
        medalType: 'Silver Medals',
        count: 60,
        year: '1984'
      },
      {
        medalType: 'Silver Medals',
        count: 31,
        year: '1988'
      },
      {
        medalType: 'Silver Medals',
        count: 34,
        year: '1992'
      },
      {
        medalType: 'Silver Medals',
        count: 32,
        year: '1996'
      },
      {
        medalType: 'Silver Medals',
        count: 24,
        year: '2000'
      },
      {
        medalType: 'Silver Medals',
        count: 40,
        year: '2004'
      },
      {
        medalType: 'Silver Medals',
        count: 38,
        year: '2008'
      },
      {
        medalType: 'Silver Medals',
        count: 29,
        year: '2012'
      },
      {
        medalType: 'Bronze Medals',
        count: 17,
        year: '1952'
      },
      {
        medalType: 'Bronze Medals',
        count: 17,
        year: '1956'
      },
      {
        medalType: 'Bronze Medals',
        count: 16,
        year: '1960'
      },
      {
        medalType: 'Bronze Medals',
        count: 28,
        year: '1964'
      },
      {
        medalType: 'Bronze Medals',
        count: 34,
        year: '1968'
      },
      {
        medalType: 'Bronze Medals',
        count: 30,
        year: '1972'
      },
      {
        medalType: 'Bronze Medals',
        count: 25,
        year: '1976'
      },
      {
        medalType: 'Bronze Medals',
        count: null,
        year: '1980'
      },
      {
        medalType: 'Bronze Medals',
        count: 30,
        year: '1984'
      },
      {
        medalType: 'Bronze Medals',
        count: 27,
        year: '1988'
      },
      {
        medalType: 'Bronze Medals',
        count: 37,
        year: '1992'
      },
      {
        medalType: 'Bronze Medals',
        count: 25,
        year: '1996'
      },
      {
        medalType: 'Bronze Medals',
        count: 33,
        year: '2000'
      },
      {
        medalType: 'Bronze Medals',
        count: 26,
        year: '2004'
      },
      {
        medalType: 'Bronze Medals',
        count: 36,
        year: '2008'
      },
      {
        medalType: 'Bronze Medals',
        count: 29,
        year: '2012',
        latest: true
      }
    ]
  },
  xField: 'year',
  yField: 'count',
  seriesField: 'medalType',
  invalidType: 'link',
  legends:{},
  line:{
    style:{
      lineDash:(datum) =>{
        if(datum.latest){
          return [5,5]
        }
        return[0,0]
      }
    }
  }
};

const vchart = new VChart(spec, { dom: CONTAINER_ID });
vchart.renderSync();

// Just for the convenience of console debugging, DO NOT COPY!
window['vchart'] = vchart;