[Feature] 折线图展示左右两边都为null的孤点

[akiozhang]

What problem does this feature solve?

这种点，配置项该如何配置呢
设置symbol似乎无法完成想要的效果

What does the proposed API look like?

[echarts-bot]

@gladcome It seems you are not using English, I've helped translate the content automatically. To make your issue understood by more people and get helped, we'd like to suggest using English next time. 🤗

TRANSLATED

TITLE

[Feature] The line chart shows the solitary points where the left and right sides are both null

BODY

What problem does this feature solve?

At this point, how to configure the configuration item?
Setting the symbol doesn't seem to accomplish the desired effect

What does the proposed API look like?

[akiozhang]

期望是不用hover也可以显示这样的效果

[Ovilia]

这个数据在系列中应该为 null，然后在另一个系列中只放这个数据点

[akiozhang]

@Ovilia 系列数据是data: [null, 3, null, 1,1,1,1,1,1]，这样的情况下，希望3这个点能够默认展示为高亮，其余点hover高亮，目前的情况是3这个点没有hover的时候看不出是否存在

[Ovilia]

symbolSize 支持回调函数的

[akiozhang]

symbolSize 支持回调函数的

似乎并不能完成想要的效果

[Ovilia]

showSymbol: false 当然没有啦。这样：

option = {
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      data: [150, 230, null, {value: 123, isDouble: true}, null, 147, 260],
      type: 'line',
      symbolSize: (data, param) => {
        return param.data && param.data.isDouble ? 20 : 0
      }
    }
  ]
};