support for "flipping" the color scheme

[cartodb]

support for "flipping" the color scheme

[davidmanzanares]

Is ramp($price, inverse(burg)) fine?

[makella]

yep!

[davidmanzanares]

inverse() is already there!

[makella]

nice!!

so what category of operator would this be?

I know we had a category of Color Constructors -- being able to manipulate things like h,s,v channels... do you think this is part of that?

[makella]

@davidmanzanares

So looking at this closer... do you mean that by default we read in the inverse() of a sequential scheme?

I ask because that is the default behavior I'm seeing.

For example, using the Airbnb data's price attribute the higher value listings, by default, are colored with the lightest color in the scheme Emrld:

color: ramp(quantiles($price,7),Emrld): result

with inverse():
color: ramp(quantiles($price,7),inverse(Emrld)): result

Let's discuss this because from a "traditional" standpoint, people will expect the inverse() result as the default vs. the way we have it now.

[davidmanzanares]

Sorry for the delay, I forgot about this.

No, I don't think this could be considered part of Color Constructors. I would say this is part of palettes, I think it would be good to explain this after explaining how cartocolors can be used with ramps, also near custom palettes (something that hasn't been implemented yet).

About reading in the inverse order, we get the order from cartocolors, but it is certainly possible that that order was meant to be read in the other way.
Does this inversion happen in all cases (all cartocolos, numeric properties, categorical properties...)?
Inverting this is easy, but, if it doesn't need to be inverted in all cases, we would need more details.

[makella]

@davidmanzanares no prob!

Let's talk about this next week... they were flipped in cartocolor.js for Builder (long story that I need to refresh myself on)

[makella]

After looking deeper david thinks this might have to do specifically with quantiles as linear is giving the expected result:

Linear example

[davidmanzanares]

I found the bug, quantiles assigned incorrectly the last bucket. Should be already fixed on ghpages now. 🚀

[makella]

Nice, checked, and looks good to me!

thanks, david!