Ramping polygon-opacity in Builder with Turbo Carto is not working

In Builder I get an error if I ramp opacity. For example, if I try something like polygon-opacity: ramp([r_total], 0.1,0.9, quantiles);

I get this error:

If I do the same styling in this Turbo Carto block, it works:

Any ideas why?

cc @rochoa

[makella]

Was excited the other day to figure out a hack for ramping opacity so thought I’d share here if anyone is interested in trying it out until we have the ability to do it in Builder.

Since we can use rgba() you can do something like this. Of course, you have to figure out the opacity for each class break manually and convert any hex values to rgb, but at least you can use a classification method to do it without having to figure out how to get the class breaks.

You can use a batch hex > rgb converter on any color scheme with a tool like this: http://www.zonums.com/online/color_converter/

Example syntax:

  polygon-fill: 
    ramp([perc_owner], 
    (rgba(196,230,195,0.2),
    rgba(128,199,153,0.3),
    rgba(77,162,132,0.5),
    rgba(45,121,116,0.7),
    rgba(29,79,96,0.9)), 
    quantiles);

@ramiroaznar thought this would mostly be exciting for you 😃

[makella]

really?? SUPER EXCITING