[BUG] Colorbar Is Missing When Plotting Geometries

[TheCedarPrince]

Details

When plotting geometries, the colorbar does not show up even with colorbar=true explicitly.I was chatting with @mkborregaard today about what I thought was just a gripe (:grapes:) about this being an implementation quirk. Instead, it was actually a bug I discovered and he wanted me to open the issue!

Here is the code to reproduce the error

using DataFrames
using Plots
using Shapefile
using ColorSchemes

states = Shapefile.Table("cb_2018_us_state_5m.shp") |> DataFrame
skip = ["02", "15", "60", "66", "69", "72", "78"]
filter!(row -> !(row[:STATEFP] in skip), states)
sort!(states, [:GEOID])

rand_vals = [rand() for _ in 1:length(states.geometry)]

c_values = ColorSchemes.get(ColorSchemes.colorschemes[:seismic], rand_vals)

choropleth = plot(states.geometry, axis = ([], false), title = "Random Plot"; fillcolor = permutedims(c_values), colorbar = true)

The associated shapefile is located in this zip here: https://www2.census.gov/geo/tiger/GENZ2018/shp/cb_2018_us_state_5m.zip

Please let me know if you want me to test anything here - thanks for the great package and great work so far! 😄

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	X
pyplot			X
plotly			X
plotlyjs			X
pgfplotsx			X
inspectdr			X

Versions

Plots.jl version: v1.11.0
Backend version (]st -m): [d2c73de3] GR_jll v0.53.0+0
Output of versioninfo():

Julia Version 1.6.0-rc3
Commit 23267f0d46 (2021-03-16 17:04 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, skylake)
Environment:
  JULIA_EDITOR = nvim

[daschw]

I would use fill_z for this:

using DataFrames
using Plots
using Shapefile

states = Shapefile.Table("cb_2018_us_state_5m.shp") |> DataFrame
skip = ["02", "15", "60", "66", "69", "72", "78"]
filter!(row -> !(row[:STATEFP] in skip), states)
sort!(states, [:GEOID])

n = size(states, 1)
plot(states.geometry, fill_z=rand(1, n), title="My title", cbar=true, color=:seismic)

[mkborregaard]

ahh, I didn't realize the code said fillcolor not fill_z :-D

[TheCedarPrince]

Perfect @mkborregaard and @daschw ! Since I hadn't really seen this documented anywhere in the ecosystem, could I add a docs PR somewhere with this as an example?

[daschw]

Sure, that would be great. I'd say either somewhere at http://docs.juliaplots.org/latest/colors/ or at http://docs.juliaplots.org/latest/attributes/ would be the right place.

[TheCedarPrince]

Hey @daschw - before I create this PR, what is fill_z exactly doing? I was a bit confused about fill_z versus fillcolor.

[mkborregaard]

automatically reinterprets a vector of numbers on a color scale and adds a colorbar for the mapping

[daschw]

marker_z and line_z does the same thing for marker color and line color.