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Posted to commits@echarts.apache.org by GitBox <gi...@apache.org> on 2020/10/05 15:08:57 UTC
[GitHub] [incubator-echarts] l1b3r opened a new issue #13389: Add tolerance margin to the tooltip for scatter charts
l1b3r opened a new issue #13389:
URL: https://github.com/apache/incubator-echarts/issues/13389
### What problem does this feature solve?
I'm using echarts to plot multiple line charts. Although they are rendered on one common X axis, each graph has its own set of X values, e.g.:
```
Chart 1: Chart 2:
[0.4; 12] [0.3; 5]
[0.8; 10] [0.7; 8]
[0.9; 11] [0.9; 6]
[0.10; 10] [0.11; 7]
... ...
```
Currently, the tooltip snaps to the X value of **one of the graphs** and shows the Y value for this exact X value, which means only one entry will be displayed in the tooltip in most of the points.
When each graph has several thousand points within a reasonably similar `[Xmin; Xmax]` range and the chart is zoomed out, it seems confusing to the user why only only one of the graphs is shown at each point of time. Please see the following screenshots for a better understanding of the issue:
I would like to propose introducing some kind of tolerance value to the tooltip, so that when it's set, the tooltip will get the Y values for nearest X within this tolerance. Here's an example of the desired feature in a different charting library. Please notice how the green circle is not perfectly aligned with the red vertical line. This is because the actual point is a little bit to the left, but it's still included in the tooltip.
### What does the proposed API look like?
Something like a `tooltipTolerance` setting either for the xAxis/yAxis or the tooltip itself.
I suppose this tolerance should be initially expressed as a % of the chart area and then automatically converted to the absolute value with dataZoom in mind.
E.g. for X axis:
`tooltipTolerance` is set to 1% and the chart is currently zoomed to the following range by the X axis: `[10, 25]`.
This means that the tooltip should have a tolerance of `± |(25 - 10) * 0.01| = ±0.15`. So when it's positioned at point `x1` for graph1 and there's no point for graph2 with exact same `x == x1`, then the tooltip should try to find a nearest point in graph2 which has an X value within `[x1 - 0.15; x1 + 0.15]`
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[GitHub] [incubator-echarts] echarts-bot[bot] commented on issue #13389: Add tolerance margin to the tooltip for scatter charts
Posted by GitBox <gi...@apache.org>.
echarts-bot[bot] commented on issue #13389:
URL: https://github.com/apache/incubator-echarts/issues/13389#issuecomment-703694878
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