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huww98 / TimeChart

An chart library specialized for large-scale time-series data, built on WebGL.
https://huww98.github.io/TimeChart
MIT License
365 stars 31 forks source link

Current values at mouse cursor #10

Open jbrryhooves opened 4 years ago

jbrryhooves commented 4 years ago

First of all, great work on this library - it works a treat.

Is there a way to extract the current values of each of the series at the current mouse cursor? Either by query, or an event to subscribe to?

Thanks

huww98 commented 4 years ago

I have implemented this, but currently, no API available.

The nearestPointModel from this line https://github.com/huww98/TimeChart/blob/ca3073ea82b32a45ef046dac6b651cf6ec802bbe/src/index.ts#L82 has a points property, which contains the values of each of the series at the current mouse cursor, and it also has an updated event.

See https://github.com/huww98/TimeChart/blob/ca3073ea82b32a45ef046dac6b651cf6ec802bbe/src/nearestPoint.ts#L109 and https://github.com/huww98/TimeChart/blob/ca3073ea82b32a45ef046dac6b651cf6ec802bbe/src/nearestPoint.ts#L125 for example usage.

You may need a custom build to expose the nearestPointModel object somehow. In the future, I may add a plugin mechanism.

jbrryhooves commented 4 years ago

great, thanks very much. I'll have a look at those files and give it a go. From initial look, it looks like it should do what I need.

citron commented 2 years ago

Hello, I need this feature too to be able to tag ECG points. Before digging into the code and try to make an API for it, do you have any news about your own (present or future) implementation?

huww98 commented 2 years ago

@citron It is easier with current beta version. See chart.nearestPoint in this page.

You can write a plugin, or just read it from the chart instance.