Contour showlines has no effect if contours.coloring != "fill"

[martin-drozdik]

From the documentation:

showlines (boolean)
default: True
Determines whether or not the contour lines are drawn. Has an effect only if contours.coloring is set to "fill".

I think it would be nice if this restriction was lifted. Otherwise it prevents the user from creating beautiful plots like:

A workaround I use now is:

line={'color':'rgba(0,0,0,0.0)'}

But this is neither readable, nor efficient.

You can find the reproducible example in this repo:

https://github.com/martin-drozdik/logit-distribution/blob/80d3f4e4d25ec51524dc79020b89dfc34d9a2476/main.js#L97

There are two branches:

1. master, where the current behavior is shown
2. workaround, where I set the contours to transparent instead of using the showlines: false

[alexcjohnson]

Is type: 'contour', coloring: 'heatmap', showlines: false
different from type: 'heatmap', zsmooth: 'best'?

Anyway that's the reason we do not allow that combination of settings, because then there are actually no contours, so it's equivalent to a heatmap and therefore best to avoid the extra overhead of generating contours.

[martin-drozdik]

You're right! type: 'heatmap', zsmooth: 'best' works and is hell of a lot faster. Thank you!

[etpinard]

Looks like this issue was resolved by #3080 (comment)

Closing.