Display the nearest data of different series in one tooltip.

What problem does this feature solve?

Is there a way to show the nearest data of different series in one tooltip?

Several series with a common x-axis are displayed on the chart. Although the time between values may differ, I would like to display a general hint if the time difference is no more than a few seconds. There can be about 8 series on the chart, a series of 30k - 100k points long, it is large dataset to dynamic search nearest data on tooltip formatter, also dynamic search is very slow. Store nearest data for each point is bad way also it’s slow too.

Chart options: The x-axis is time, the y-axis is value.

Series 1: [{x: 1 ms}, {x: 3 ms}, {x: 5 ms}]
Series 2: [{x: 0 ms}, {x: 2 ms}, {x: 6 ms}]

What does the proposed API look like?

May be

tooltip: {
    nearest: true,
    formatter: (params: Object|Array, nearest: Object|Array) =>
}

[Ovilia]

@Raphyyy Thanks for reporting. We are going to work on axisPointer.snap in the near future.

[Raphyyy]

Nice thanks! I think the actual implementation of axisPointer.snap if true is to magnet the axisPointer to the nearest point, no matter the series. The approach here is a bit different. The purpose is not to magnet axisPointer to the nearest point, it’s to read all series’ nearest point to get them in the tooltip, so I don’t know if it is related to axisPointer.snap at the end.