漏斗图echarts funnel配置项内容和展示

如图所示，还需要修改哪个参数让漏斗图底部（最大值部分）变成平边，而不是一个尖角

      option = {
    title: {
        text: '漏斗图',
        subtext: '纯属虚构'
    },
    tooltip: {
        trigger: 'item',
        formatter: "{a} <br/>{b} : {c}%"
    },
    toolbox: {
        feature: {
            dataView: {readOnly: false},
            restore: {},
            saveAsImage: {}
        }
    },
    legend: {
        data: ['展现','点击','访问','咨询','订单']
    },
    calculable: true,
    series: [
        {
            name:'漏斗图',
            type:'funnel',
            left: '10%',
            top: 60,
            //x2: 80,
            bottom: 60,
            width: '80%',
            // height: {totalHeight} - y - y2,
            min: -100,
            max: -20,
            minSize: '-100%',
            maxSize: '0%',
            sort: 'decending',
            gap: 3,
            label: {
                normal: {
                    show: true,
                    position: 'inside'
                },
                emphasis: {
                    textStyle: {
                        fontSize: 20
                    }
                }
            },
            labelLine: {
                normal: {
                    length: 10,
                    lineStyle: {
                        width: 1,
                        type: 'solid'
                    }
                }
            },
            itemStyle: {
                normal: {
                    borderColor: '#fff',
                    borderWidth: 1
                }
            },
            data: [
                {value: -60, name: '访问'},
                {value: -40, name: '咨询'},
                {value: -20, name: '订单'},
                {value: -80, name: '点击'},
                {value: -100, name: '展现'}
            ]
        }
    ]
};