Module style 

Shared styling: a color-blind-safe default palette and small helpers for building ShapeStyles, used by every chart type so the crate’s output is visually consistent.

The default palette is the Okabe–Ito qualitative palette, designed to be distinguishable under the common forms of color-vision deficiency.

Okabe, M. & Ito, K. (2008). Color Universal Design (CUD): How to make figures and presentations that are friendly to colorblind people. https://jfly.uni-koeln.de/color/

Constants

DEFAULT_FONT

Default label / axis font family used across the crate’s examples.

DEFAULT_FONT_SIZE

Default font size (points) for legend and annotation text.

OKABE_ITO

The eight Okabe–Ito colors as (r, g, b) triples, in the recommended order.

Functions

fill_style

A solid-fill ShapeStyle of the given color (filled = true).

palette_color

Returns the i-th palette color, cycling through the seven non-black Okabe–Ito hues. Deterministic, so the k-th series always gets the same color across every chart type.

rgba

Convenience: a fully-specified RGBAColor with explicit alpha.

stroke_style

A stroked (outline) ShapeStyle of the given color and width (filled = false).

translucent_fill

A translucent fill built from color at the given alpha (0.0–1.0).