Enum FillPattern 

pub enum FillPattern {
    Stripe {
        fg: (u8, u8, u8),
        bg: (u8, u8, u8),
        size_px: f64,
        angle_deg: f64,
    },
}

A pattern fill for an area that has no single colour to draw — today just a scale’s na_pattern (#206): ScaleFillBinned::na_pattern, drawn instead of na_value’s flat colour by geom_sf/geom_polygon/ geom_rect/geom_tile and the legend’s “no data” key, so a classed choropleth’s no-data cells read as “we have no reading here” rather than a greyed-out value easily mistaken for one.

fg stripes run at angle_deg (0 = horizontal, measured the usual screen way, clockwise from the x axis), each size_px wide, over a bg field — fg fills the first 30% of each cycle, bg the rest, a thin hatch rather than an even 50/50 stripe (ggplot2/R’s own pattern_stripe(density = 0.3) default). More pattern kinds can join this enum later without breaking callers that match it today only via FillPattern::bg/FillPattern::color_at.

Variants

Stripe

Fields

fg: (u8, u8, u8)

bg: (u8, u8, u8)

size_px: f64

The width of one fg+bg cycle, in output pixels. <= 0.0 is treated as 1.0 (an unreasonably fine hatch rather than a division by zero/negative-period wraparound).

angle_deg: f64

Stripe direction in degrees (0 = horizontal).

Implementations

impl FillPattern

pub fn stripe(fg: (u8, u8, u8), bg: (u8, u8, u8)) -> FillPattern

A reasonable default stripe: fg/bg as given, 4px period, 45°.

pub fn bg(&self) -> (u8, u8, u8)

The flat colour a backend with no pattern primitive falls back to (plotters — “falls back to bg”, #206) — the pattern’s background, so a no-data cell still reads as muted, just without the hatch.

pub fn color_at(&self, x: f64, y: f64) -> (u8, u8, u8)

This pattern’s colour at screen point (x, y) — a raster backend (pixel/canvas) fills per pixel with this (“raster stripes”, #206) rather than approximating with FillPattern::bg.

Trait Implementations

impl Clone for FillPattern

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for FillPattern

impl Debug for FillPattern

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for FillPattern

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for FillPattern