Update the colormap HTML representation

[HaudinFlorence]

Update the colormap HTML representation to match the way it renders on Folium maps.
Here is a preview of the colormap used with Choropleth layer from ipyleaflet.

[martinRenou]

@ocefpaf it would be great if you could consider this PR for the next release :) We'd like to use branca more in ipyleaflet

[HaudinFlorence]

@ocefpaf it would be great if you could consider this PR for the next release :) We'd like to use branca more in ipyleaflet

Here is another example of the use of Branca and the custom colormap in ipyleaflet

[HaudinFlorence]

@Conengmo @ocefpaf Another possible use of the customized Branca colormap proposed in this PR is with Heatmap layer (adaptation of the code investigated right now) . So this makes 3 layers possibly using this colormap in ipyleaflet :-).

[davidbrochart]

It looks like the maintainers are busy, we'd like to move forwards with this.
Is there any way we can help you @ocefpaf? Maybe you can give one of us commit rights?

[martinfleis]

Also happy to help with branca and folium maintenance if needed.

[HaudinFlorence]

Hello, is there any way of making things progress on this PR please ? Many thanks.

[Conengmo]

I had to check, because I normally don't use the Colormap._repr_html_ method. It does look better this way! It would be nice to reuse more of the code/template we use in the 'normal' render function, but that shouldn't hold back this change.

• I added a docstring to the method.
• Changed the example notebook to not use ipyleaflet, since that's currently not a (dev) dependency for branca. It still shows the example fine.

I'll merge after the tests ran.

[ocefpaf]

Also happy to help with branca and folium maintenance if needed.

I completely missed this PR and the comments here, sorry. BTW, I'd love to take on your offer here. Does that still stands?

[martinfleis]

BTW, I'd love to take on your offer here. Does that still stands?

@ocefpaf Yeah, it does. Now that we have exposed folium in geopandas it seems beneficial to have a bit of overlap in maintenance to channel issues and fixes to the right place. And I hope it may also help shorten the release cycle of folium.

[ocefpaf]

@martinfleis I'm assuming you are in for branca and folium, right?

@HaudinFlorence are you or others in your team interested too? Would that be only branca b/c it is now an ipyleaflet dependency?

[martinfleis]

I'm assuming you are in for branca and folium, right?

Yup. Can't promise a ton of activity but some for sure.

[ocefpaf]

Can't promise a ton of activity but some for sure.

I'm sure it will be more than what I have been offering these projects lately :-)

[HaudinFlorence]

@HaudinFlorence are you or others in your team interested too? Would that be only branca b/c it is now an ipyleaflet dependency?

Thanks a lot for merging the PR @ocefpaf . We might indeed mainly contribute to branca to upstream features needed in ipyleaflet

[martinRenou]

Happy to help contribute too!

[ocefpaf]

You three should have access to branca and Martin also has access to folium. Thanks!

[HaudinFlorence]

You three should have access to branca and Martin also has access to folium. Thanks!

@ocefpaf Can you please re regive me access to Branca. I left the organization by mistake. Thanks.

[el-gif]

Hello @HaudinFlorence, how do you know which colormap (viridis, plasma etc.) to use for the correct matching in your screenshots of the Heatmap and Velocity layers? Also, I am working with Shiny for Python to create a Webapp and ColormapControl doesn't seem to work in this constellation (ColormapControl created in the server function).