雷达图怎样更改方向？echarts radar配置项内容和展示

该示例中是六边形的角在竖直方向，怎样使其旋转一个角度使边在竖直方向上？在配置项中并没有找到，望告知谢谢！

      // Schema:
// date,AQIindex,PM2.5,PM10,CO,NO2,SO2
var dataBJ = [
 
    [134,96,165,2.76,83,41,29]
  
];

var lineStyle = {
    normal: {
        width: 1,
        opacity: 0.8
    }
};

option = {
    backgroundColor: '#161627',
    radar: {
        indicator: [
            {name: 'AQI', max: 300},
            {name: 'PM2.5', max: 250},
            {name: 'PM10', max: 300},
            {name: 'CO', max: 5},
            {name: 'NO2', max: 200},
            {name: 'SO2', max: 100}
        ],
        shape: 'circle',
        splitNumber: 5,
        name: {
            textStyle: {
                color: 'rgb(238, 197, 102)'
            }
        },
        splitLine: {
            lineStyle: {
                color: [
                    'rgba(238, 197, 102, 0.1)', 'rgba(238, 197, 102, 0.2)',
                    'rgba(238, 197, 102, 0.4)', 'rgba(238, 197, 102, 0.6)',
                    'rgba(238, 197, 102, 0.8)', 'rgba(238, 197, 102, 1)'
                ].reverse()
            }
        },
        splitArea: {
            show: false
        },
        axisLine: {
            lineStyle: {
                color: 'rgba(238, 197, 102, 0.5)'
            }
        }
    },
    series: [
        {
            name: '北京',
            type: 'radar',
            lineStyle: lineStyle,
            data: dataBJ,
            symbol: 'none',
            itemStyle: {
                normal: {
                    color: '#F9713C'
                }
            },
            areaStyle: {
                normal: {
                    opacity: 0.3
                }
            }
        }
  
    ]
};