POC + WIP: What's the best font for the workmark?

[seisman]

The "Space Grotesk" font used in the original PyGMT logo design (#1404 (comment)) looks great. However, this font is not available in GMT. If we want to use it, there are two possible approaches:

1. Configure PyGMT to download and use the font dynamically, which would require an internet connection.
2. Convert the glyphs of the font into polygons and render them using Figure.plot.

Option 2 is technically feasible, and the polygons could potentially be generated using AI tools such as ChatGPT. However, the resulting polygon data would likely be extremely complex and verbose.

Given these limitations, I think we will probably need to rely on the built-in GMT fonts instead. Currently, we use font 13 (AvantGarde-Book). I temporarily modified the source code to allow the wordmark font to be set dynamically and tested all available GMT fonts.

import pygmt

fig = pygmt.Figure()
with fig.subplot(nrows=5, ncols=8, subsize=("2.5c", "3c"), tag=0):
    for font in range(0, 34):
        with fig.set_panel(panel=font):
            fig.pygmtlogo(font=font, wordmark="vertical")
fig.show()
fig.savefig("logos-vertical.png")

fig = pygmt.Figure()
with fig.subplot(nrows=9, ncols=4, subsize=("9c", "2.5c"), tag=0):
    for font in range(0, 34):
        with fig.set_panel(panel=font):
            fig.pygmtlogo(font=font, wordmark="horizontal")
fig.show()
fig.savefig("logos-horizontal.png")

GMT Fonts: https://docs.generic-mapping-tools.org/dev/reference/postscript-fonts.html

Horizontal (the subplot tag is the font ID)

Vertical (the subplot tag is the font ID)

[yvonnefroehlich]

I also really like the font Space Grotesk by Florian Karsten, but I think it's much easier to use a font supported by GMT.
Also not sure about the copyright for this font (https://fonts.google.com/specimen/Space+Grotesk/license?preview.script=Latn).