[Feature] tooltip's trigger support series for Pie chart

[mortalYoung]

What problem does this feature solve?

• echarts: 5.5.1

I found the pie chart only support item tooltip.
But if i got a nest pie chart, and i wanted to show then series data when hover the item(highlight current one), it was difficult to do.

I could use my chartData instead of get params from formatter. But it gets some problems when hidden by legend.

Example

What does the proposed API look like?

tooltips:{
    trigger: 'series', // ONLY support for Pie
    formatter:(params: Array) => {
        // do something
        return '';
    }
}

[Ovilia]

What do you expect by setting tooltip.trigger to 'series'?

[mortalYoung]

What do you expect by setting tooltip.trigger to 'series'?

I can achieve something similar to the Example.

There is one issue with this example is when i hide the data by click legend, it still remains visible on the tooltip.

[Ovilia]

Items with the same name are grouped and controlled together in legend. So you may set the same data.name for the items you wish to group together and data.itemStyle.color to set different colors.

[mortalYoung]

Sorry, I couldn't get your point very much.

As for me, If without 'series' for nested pie chart, I only use a hack way to get the series data and format it to tooltip, so that I could render my series data on tooltip instead of just one item's data.

If echarts could support 'series', then I could get the series data in a formal way and by the way I could fix the issue which I mentioned before.

here is one issue with this example is when i hide the data by click legend, it still remains visible on the tooltip.