[GitHub] [incubator-echarts] xianxianya opened issue #9004: 桑葚图visualMap设置图形无效果，桑葚图是否支持将矩形图形设置为圆形？

[GitHub]

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### One-line summary [问题简述]
桑葚图visualMap设置图形无效果，桑葚图是否支持将矩形图形设置为圆形？




### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]:3.0&4.0
+ Browser version [浏览器类型和版本]:chrome
+ OS Version [操作系统类型和版本]:windows





### Expected behaviour [期望结果]
将桑葚图sankey矩形设置为圆形




### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
option = {

}

```
myChart.setOption(option = {
        title: {
            text: 'Sankey Diagram'
        },
        tooltip: {
            trigger: 'item',
            triggerOn: 'mousemove'
        },
        visualMap:{
            type:'piecewise',
            dimension:0,
            categories:['成功','失败'],
            inRange:{
                color:['green','red'],
                symbol:'circle',
                symbolSize:30
            }
        },
        series: [
            {
                type: 'sankey',
                layout: 'none',
                data: 
[{name:'1',value:['成功']},{name:'2',value:['失败']},{name:'3',value:['成功']},{name:'4',value:['失败']}],
                links: 
[{source:'1',target:'2',value:1},{source:'1',target:'3',value:1},{source:'3',target:'4',value:1}],
                itemStyle: {
                    normal: {
                        borderWidth: 1,
                        borderColor: '#aaa'
                    }
                },
                lineStyle: {
                    normal: {
                        color: 'source',
                        curveness: 0.5
                    }
                }
            }
        ]
    });



### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->



[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9004 ]
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