Gradient patterned grobs

grid.pattern_gradient() draws a gradient pattern onto the graphic device.

grid.pattern_gradient(
  x = c(0, 0, 1, 1),
  y = c(1, 0, 0, 1),
  id = 1L,
  ...,
  fill = gp$fill %||% "grey80",
  fill2 = "#4169E1",
  orientation = "vertical",
  alpha = gp$alpha %||% NA_real_,
  use_R4.1_gradients = getOption("ggpattern_use_R4.1_gradients",
    getOption("ggpattern_use_R4.1_features")),
  aspect_ratio = 1,
  key_scale_factor = 1,
  res = 72,
  default.units = "npc",
  name = NULL,
  gp = gpar(),
  draw = TRUE,
  vp = NULL
)

Arguments

x	A numeric vector or unit object specifying x-locations of the pattern boundary.
y	A numeric vector or unit object specifying y-locations of the pattern boundary.
id	A numeric vector used to separate locations in x, y into multiple boundaries. All locations within the same id belong to the same boundary.
...	Currently ignored
fill	Fill colour
fill2	Second colour
orientation	vertical, horizontal, or radial
alpha	Alpha (between 0 and 1) or NA (default, preserves colors' alpha value).
use_R4.1_gradients	Whether to use the gradient feature introduced in R v4.1 or use a rasterGrob approximation. Note not all graphic devices support the grid gradient feature.
aspect_ratio	Override aspect ratio
key_scale_factor	Additional scale factor for legend
res	Assumed resolution (in pixels per graphic device inch) to use when creating array pattern.
default.units	A string indicating the default units to use if x or y are only given as numeric vectors.
name	A character identifier.
gp	An object of class "gpar", typically the output from a call to the function gpar. This is basically a list of graphical parameter settings.
draw	A logical value indicating whether graphics output should be produced.
vp	A Grid viewport object (or NULL).

Value

A grid grob object invisibly. If draw is TRUE then also draws to the graphic device as a side effect.

Examples

 if (require("grid") && require("magick") && capabilities("png")) {
   x_hex <- 0.5 + 0.5 * cos(seq(2 * pi / 4, by = 2 * pi / 6, length.out = 6))
   y_hex <- 0.5 + 0.5 * sin(seq(2 * pi / 4, by = 2 * pi / 6, length.out = 6))
   grid.pattern_gradient(x_hex, y_hex, fill = "green")
   grid.newpage()
   grid.pattern_gradient(x_hex, y_hex, fill = "green", orientation = "radial")
 }