Add Speed [ SPED ] axis

[vv-monsalve]

Requirements

• [x] I have inspected the current Axis Registry and there is not a registered custom axis that could be used for the variation purpose on the upcoming font project.
• [x] The metadata fields of the proposed axis meet the Axis Requirements as specified in the Protocol (linked above).

Font project(s) using the axis

Playpen, currently in a private repo

Short description of what the axis does

As the speed increase, the joins and ending strokes go from slow (0%), with more rounded arches, to fast (100%), making the junctions more diagonal and fluid.

Image

Why is the axis needed

Speed is a decisive factor in the construction of the letters, which alters their shape and, therefore, the rhythm and fluidity of the writing. This axis would offer specific control over that factor, allowing a fine-tuning of those features.

Axis metadata fields

# SPED based on github.com/googlefonts/playpen
tag: "SPED"
display_name: "Speed"
min_value: 0
default_value: 0
max_value: 100
precision: 
fallback {
  name: "Default"
  value: 0.00
}
fallback_only: false
description: "As the speed increase, the joins and ending strokes go from slow (0%),"
  " with more rounded arches to fast (100%), making the junctions more diagonal and fluid."

[vv-monsalve]

@josescaglione Please feel free to make adjustments.

[josescaglione]

maybe we can improve description:

The velocity at which writing is executed significantly impacts the tension of curves and the angularity of connections. When writing at a low speed (0%), arches tend to exhibit roundness, and curve radii remain more open. Conversely, a high speed (100%) results in sharper turns, acute connections, and the manifestation of diagonal and fluid strokes.

[davelab6]

We want this description to be rather short, as its used in a tooltip on the fonts.google.com "type tester", while a much longer description is desirable for the GFK Glossary page on the axis.

[josescaglione]

The velocity at which writing is executed significantly impacts the tension of curves and the angularity of connections.

??

[vv-monsalve]

Intermediate point proposal:

"As the Speed of writing increases, it impacts the curves and angularity of connections." 
  "  Going from low-speed roundness arches (0%) to sharper turns with acute connections"
  "  at high speed (100%), manifesting more fluidity."

As Dave says, expanded details on the explanation of the axis can be added and will be required for the Knowledge entry for the axis.

[davelab6]

Thanks both! I would rephrase as:

Adjusts the apparent speed of writing the letterforms, by increasing curve tension and the angularity of stroke connections, from low-speed round arches (0%) to sharper turns at high-speed (100%).

Here's a couple of in-context examples:

[vv-monsalve]

Final Metadata fields:

# SPED based on github.com/googlefonts/playpen
tag: "SPED"
display_name: "Speed"
min_value: 0
default_value: 0
max_value: 100
precision: 
fallback {
  name: "Default"
  value: 0.00
}
fallback_only: false
description: "Adjusts the apparent speed of writing the letterforms by increasing curve tension and the angularity"
    " of stroke connections, from low-speed round arches (0%) to sharper turns at high-speed (100%)."

[vv-monsalve]

We'll add it in the future when the big PW family is ready to be onboarded.