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support chloropleth maps with colormaps

@tbreloff following up from JuliaGeo/Shapefile.jl#10, I currently have the following going:

image

with code that's similar to

function plot(df::DataFrame; plt = Plots.plot(bg = :black),
geom::Symbol=:none, label::Symbol=:none, kwargs...)
geometries = (geom == :none) ? df[:geometry0] : df[geom]
for (i,geom) in enumerate(geometries)
DataFrames.isna(geom) && continue
if label != :none
plot!(plt, shape(geom); label=df[i,label], kwargs...)
else
plot!(plt, shape(geom); kwargs...)
end
end
plt
end
:

function plot(df::DataFrame; plt = Plots.plot(bg = :black), geom::Symbol=:none, label::Symbol=:none, kwargs...)
    geometries = (geom == :none) ? df[:geometry0] : df[geom]
    for (i,geom) in enumerate(geometries)
        DataFrames.isna(geom) && continue
        if label != :none
            plot!(plt, shape(geom); label=df[i,label], kwargs...)
        else
            plot!(plt, shape(geom); kwargs...)
        end
    end
    plt
end

But I'm struggling to follow the development in Plots (or PlotRecipes or RecipesBase) to figure out what needs to be done to support chloropleth maps. Might you have any pointers for me to look through? Feedback on better practices will be welcome too!

@mkborregaard: feel free to chip in

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