[WID-218] Add controls for channel coloring - TS widget with plotly

[peeplika]

Added a dropdown menu to the TimeSeriesWidgetPlotly for selecting colormap for individual channels.

[romina1601]

Hi @peeplika
The dropdown looks ok, but I have some notes on it:

• If you select just a few channels, then change the color scheme from the dropdown, all the channels are displayed, but we should only see the selected channels
• Same thing happens if you select a few channels, then change the signal scaling. See the screenshot from below

• I don't think all the color schemes are suited for this type of visualization, because sometimes some channels are not really visible (e.g.: "RdGy" color scheme, where some channels are almost white). See the bottom channels in screenshot from below.
  

• I found at least one color scheme that doesn't seem to work (it's called "rainbow"). There is simply no change in the colors when I select it.

• Changing the colors is a bit too slow. Would be great if you could make an improvement on that part as well.

[peeplika]

Hello @romina1601,

Thank you for your feedback. I've made several improvements based on your notes:

1.Fixed the issue where all channels were displayed when changing the color scheme.
2.Removed unsuitable colormaps.
3.Enhanced the speed of color scheme changes.

I have also added an option for uni-color.
I kindly ask you to review the changes and let me know if any further adjustments are needed.

[romina1601]

Hi @peeplika ,

1. The first improvement that you made doesn't seem to work for me. The issue persists: I select a few channels, hit Submit selection, then change the Color map or Signal scaling and all the channels reappear on the plot.
2. This looks good, now I can clearly see all the channels.
3. It is indeed faster, which is great.

[peeplika]

Hi @romina1601
Thanks for the review.
I have made a few changes - Only the selected channels are passed as arguments in update_colormap and update_scaling methods so that only those are displayed. I have renamed picks as ch_picked for clarity and consistency.
I think the issue should be resolved now . Can you please take a look again ?

[romina1601]

Hi @peeplika ,
Looks good now and it moves fast enough. But there seems to be a problem with the colormap "gist_ncar_r". If I select it, it results in an error. Could you take a look at that?

[romina1601]

Hi @peeplika , Looks good now and it moves fast enough. But there seems to be a problem with the colormap "gist_ncar_r". If I select it, it results in an error. Could you take a look at that?

This is a problem only in the TimeSeriesTVB.ipynb notebook. In the other notebook (the one using numpy arrays) it works fine.

[peeplika]

Hi @romina1601
Many thanks for reviewing again.
I have made some adjustments to prevent the error