Crisp vector hatch fill

pattern_hatch() is the vector companion of the tile patterns above: evenly spaced parallel lines produced as real geometry via vellum::vl_hatch() rather than a rasterised tile. Because it is vector, it stays crisp at any magnification and in PDF (no embedded image), which makes it the better redundant, non-colour encoding for accessible and print output — the "fix it" step alongside plot_lint() and render_plot(cvd = ).

Usage

pattern_hatch(
  color = "grey20",
  bg = NA,
  angle = 45,
  spacing = 3,
  linewidth = 0.75
)

Arguments

color

Line colour (any R colour). Default "grey20".

bg

Background fill painted behind the lines, or NA (default) for a transparent field so what is under the shape shows through.

angle

Line orientation in degrees. Any angle is allowed (unlike the tile patterns, vector hatch has no seamless-tiling restriction). Default 45.

spacing

Distance between lines, in millimetres. Default 3.

linewidth

Line width. Default 0.75.

Value

A vellum_hatch object, usable as a fill value.

Details

Use it exactly like the other pattern constructors: as a constant fill on a filled mark, or as one of the values of scale_pattern() to map a discrete variable to hatch textures.

See also

patterns, scale_pattern(), plot_lint(), vellum::vl_hatch()

Examples

df <- data.frame(g = c("a", "b", "c"), n = c(3, 5, 2))
vplot(df) |> mark_bar(x = g, y = n, fill = pattern_hatch(angle = 30))