Allow setting colors from table data

[iriberri]

It seems that this is possible from one year ago: https://github.com/mapbox/tilemill/issues/1809

Could we update the system to support it?

[danicarrion]

+1

[andrewbt]

+1 This has now been requested by a partner and would also be useful for getting around the category wizard's default upper limit of 10 categories. @saleiva @javisantana thoughts? Seems like just a simple update to mapnik source.

[javisantana]

"simple" and "mapnik" can't go in the same sentence man :)

[rochoa]

Just an small update, I looked a bit into this and as stated above is not that simple. Something in our stack makes this not to work with latest version. Using same cartocss version linked in tilemill and windshaft.

I have to dedicate more time to this one.

[iriberri]

Ha! :-) Thanks for the update Raúl!

[saleiva]

We need a better estimation for this - @rochoa ?

[rochoa]

Next milestone.

[saleiva]

I meant in effort :)

[rochoa]

It's about debugging, I cannot estimate debugging time.

[saleiva]

Then, I'm not sure I'd prioritize this so much, unless it's related with some other bugs

[rochoa]

If you agree, I will try to invest a fixed amount of time depending on the rest of the milestone to at least document what's going on.

[peterdesmet]

I'd also like this feature. In fact, I'd like to do a RGB mix based on table data:

polygon-fill: rgb(value1, value2, value3)

[rochoa]

Well, just to summarize the changes we need to make to support this:

Parsing

• Upgrade carto at grainstore to a more recent version, like 0.15.1-cdb1
• Use mapnik-reference 3.0.0

Rendering

• Use node-mapnik 3.x
• Upgrade tilelive-mapnik to support node-mapnik 3.x
• Upgrade abaculus to use node-mapnik 3.x so we don't use different node-mapnik versions