玫瑰图lable的位置不居中echarts 饼配置项内容和展示

如何才能让lable文字相对每一扇区居中显示，或是用别的方法实现这个效果

      var data = [{
            name: '东城区',
            value: 123
        }, {
            name: '西城区',
            value: 234
        }, {
            name: '朝阳区',
            value: '345'
        }, {
            name: '海淀区',
            value: '456'
        }, {
            name: '通州区',
            value: '567'
        }, {
            name: '顺义区',
            value: '678'
        }, {
            name: '房山区',
            value: '789'
        }, {
            name: '大兴区',
            value: '890'
        }, {
            name: '昌平区',
            value: '901'
        }, {
            name: '平谷区',
            value: '102'
        }, {
            name: '延庆区',
            value: '234'
        }, {
            name: '门头沟',
            value: '234'
        }, {
            name: '密云区',
            value: '234'
        }, {
            name: '怀柔区',
            value: '234'
        }, {
            name: '丰台区',
            value: '234'
        }, {
            name: '石景山区',
            value: '234'
        }];

        var legendData = (function () {
            var ret = [];
            for (var i = 0; i < data.length; i++) {
                ret.push(data[i].name);
            }
            return ret;
        })();

        var pose = ['50%', '50%'];

        option = {
            backgroundColor: '#fff',
            title: {
                text: 'test',

                //subtext: '2016年1月',
                //x: 'center',
                //y: '37%',
                textStyle: {
                    fontWeight: 'normal',
                    fontSize: 12
                }
            },
            
            toolbox: {
                feature: {
                    dataView: {
                        show: true,
                        readOnly: false
                    },
                    restore: {
                        show: true
                    },
                    saveAsImage: {
                        show: true
                    }
                }
            },
            legend: {
               // orient: 'horizontal',
           
                top:'5%',
                 orient: 'vertical',
                x: 'left',
                data: legendData
            },
            

            series: [{
                type: 'pie',
                selectedMode: false,//点击选择模式
                hoverAnimation:false,//hover放大扇区
                animationDuration:500,//动画时间
                radius: ['6%', '60%'],
                //radius: '60%',
                roseType: 'area',
                //color: ['#86D560', '#AF89D6', '#59ADF3', '#FF999A', '#FFCC67'],
                center: pose,
                avoidLabelOverlap:false,//标签防重叠
                label: {
                    normal: {
                        show:true,
                        formatter:'{d}%',
                        textStyle:{
                            color:"#fff"
                        },
                        position: 'inside'
                    }
                },
                markPoint:{
                    
                },
                labelLine: {
                    normal: {
                        show: false
                    }
                },
                data: data
            },



                //外圈
                {
                    type: 'pie',
                    center: pose,
                    hoverAnimation:false,//hover放大扇区
                    avoidLabelOverlap:false,
                    animationDuration:800,//动画时间
                    radius: ['65%', '80%'],
                    roseType: 'area',
                    axisLabel:{
                        "distance": -80,
                        "textStyle": {
                        "color": "#fff"
                        }
                    },
                    
                    labelLine: {
                        normal: {
                            show: true
                        }
                    },
                    label: {
                        normal: {
                            show: true,
                            position: 'outside',
                            formatter: '{b}',
                            
                            textStyle: {
                                color: '#000',
                                fontWeight: 'bold',
                                fontSize: 12
                            }
                        }
                    },
                    data: [{
                        name: '东城区',
                        value: 200
                    }, {
                        name: '西城区',
                        value: 200
                    }, {
                        name: '朝阳区',
                        value: '200'
                    }, {
                        name: '海淀区',
                        value: '200'
                    }, {
                        name: '通州区',
                        value: '200'
                    }, {
                        name: '顺义区',
                        value: '200'
                    }, {
                        name: '房山区',
                        value: '200'
                    }, {
                        name: '大兴区',
                        value: '200'
                    }, {
                        name: '昌平区',
                        value: '200'
                    }, {
                        name: '平谷区',
                        value: '200'
                    }, {
                        name: '延庆区',
                        value: '200'
                    }, {
                        name: '门头沟',
                        value: '200'
                    }, {
                        name: '密云区',
                        value: '200'
                    }, {
                        name: '怀柔区',
                        value: '200'
                    }, {
                        name: '丰台区',
                        value: '200'
                    }, {
                        name: '石景山区',
                        value: '200'
                    }]
                },
            ]
        };