How do I create a PlotTheme with larger fonts in the legend

Specific Domains Visualization
, ,
1

Greetings,
I started using Julia a week ago and I’m documenting my transition from a background in MATLAB + Python to Julia at cooperrc.github.io.

I found myself stuck today when I tried to build my own theme and add it to PlotThemes.jl. Everything works great, except changing the legend_font_pointsize. It only has an effect if its included in the plot call.

Here is the theme I’m building:

_themes[:cooper] = PlotTheme(linewidth = 4,
                             markersize = 10,
                             fontfamily = "Sans",
                             titlefontsize = 24,
                             guidefontsize = 18,
                             tickfontsize = 18,
                             legend_font_pointsize = 18,
                            )

All the other fonts are 18 and 24, but the legend is still 8. I couldn’t find a different call to use in the subplot attributes

Any idea how to get the default legend font to be larger?

2

Hello and welcome to the community!

See the options here
https://docs.juliaplots.org/stable/generated/attributes_subplot/
search for legend_font

Example:

legend_font = Plots.Font("sans-serif", 8, :hcenter, :vcenter, 0.0, RGB{N0f8}(0.0,0.0,0.0))
3

Thanks! One follow-up though, it looks like the PlotThemes does not use Plots as a dependency. It only passes the PlotUtils values to the plot commands.

If I include Plots.Font, then I get an error or I can add using Plots to PlotThemse.jl. Then, I get a warning.

Is there a standard practice for specifying fonts via a call like Plots.theme(...)? Should I be using a different method for font specifications?

4

Wrapping this thread up:

I think the issue might have been how I was installing Julia. I tried three approaches:

  1. Install via conda issues
  2. Install via pacman issues
  3. install from julia github switch to v1.7.2 branch and make no issues

Now, when I call the theme

_themes[:cooper] = PlotTheme(linewidth = 4,
                             markersize = 10,
                             fontfamily = "Sans",
                             titlefontsize = 24,
                             guidefontsize = 18,
                             tickfontsize = 18,
                             legend_font_pointsize = 18,
                            )

Using Plots.theme(:cooper) I get a legend that has 18-point font just like the ticks and guides. It could have been a versioning issue on my end.