posit-dev / posit-dev/ggsql

Discrete palettes for ordinal scales

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plot building
Dominant language
Rust
Stars
554
Forks
30
Avg merge
17h 27m
Merged PRs (30d)
8

Description

I feel like there has got to be a way to manually assign values to breaks.
Like in the plot below, I'd expect the Gentoo path to be very thick, not very thin.

FROM ggsql:penguins
VISUALISE bill_len AS x, bill_dep AS y, species AS stroke, species AS linewidth
  DRAW path
  SCALE linewidth
    FROM ('Adelie', 'Chinstrap', 'Gentoo')
    TO (1, 0.1, 10)

If this behaviour already exists with some incantation I'm unaware of, maybe we should advertise this a bit more.

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Research direction

Start by reproducing the SQL example using the penguins data and the linewidth scale. Trace how ordinal scale values are currently handled and determine whether the requested mapping is a new feature or existing behavior that needs documentation; done means the Adelie, Chinstrap, and Gentoo categories receive the requested linewidths.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust, sql
Domain
data-visualization
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
52/100

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