Feature Request - Additional Color Gradients

[jerowe]

This is not a bug, but a feature request, or a point me towards code so I can do it request. ;-)

I would like to have some additional color gradient options, specifically for the heatmap. I have several heatmaps with thresholds, which leads to empty cells. These cells are white, but white is also a color in the gradient.

Please see attached. It is impossible to tell if values are empty, they did not make the cutoff, or if they are '1' (in this case).

Thanks!

[BLiu1]

I have the same problem/interest in seeing this developed. A color palette creator would be appreciated.

[mistercrunch]

Here's the source for the color spectrums:
https://github.com/apache/incubator-superset/blob/master/superset/assets/src/modules/colors.js#L94

References can be added here:
https://github.com/apache/incubator-superset/blob/8c822f1e9b566247ec94c368b45e36e7d767e90e/superset/assets/src/explore/controls.jsx#L314

This is a great resource, notice the "colorblind safe" option:
http://colorbrewer2.org/

Maybe we also need an "Empty Cell Color" colorpicker control to be added to the Heatmap viz.

[jerowe]

I think I could get a start on this. Thanks for pointing me in the right direction!

[jerowe]

Since d3 is already imported could I just use the d3 scales? I like those.

[mistercrunch]

We use d3 scales behind the scene. The interface is an array of color though.

[jerowe]

I have a script on my side that does a data dump of the d3 scales, so no need anymore.

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