grid.pattern_regular_polygon() draws a regular polygon pattern onto the graphic device.

grid.pattern_regular_polygon(
  x = c(0, 0, 1, 1),
  y = c(1, 0, 0, 1),
  id = 1L,
  ...,
  colour = gp$col %||% "grey20",
  fill = gp$fill %||% "grey80",
  angle = 30,
  density = 0.2,
  spacing = 0.05,
  xoffset = 0,
  yoffset = 0,
  scale = 0.5,
  shape = "convex4",
  grid = "square",
  type = NULL,
  subtype = NULL,
  rot = 0,
  alpha = gp$alpha %||% NA_real_,
  linetype = gp$lty %||% 1,
  linewidth = size %||% gp$lwd %||% 1,
  size = NULL,
  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

colour

Stroke colour

fill

Fill colour

angle

Rotation angle in degrees

density

Approx. fraction of area the pattern fills.

spacing

Spacing between repetitions of pattern ('snpc' units between 0 and 1).

xoffset

Shift pattern along x axis ('snpc' units between 0 and 1).

yoffset

Shift pattern along y axis ('snpc' units between 0 and 1).

scale

For star polygons, multiplier (between 0 and 1) applied to exterior radius to get interior radius.

shape

Either "convex" or "star" followed by the number of exterior vertices or alternatively "circle", "square", "null", "rhombille_rhombus", "tetrakis_left", or "tetrakis_right". For example "convex5" corresponds to a pentagon and "star6" corresponds to a six-pointed star. The "square" shape is larger than the "convex4" shape and is rotated an extra 45 degrees, it can be used to generate a multi-colored “checkers” effect when density is 1. The "null" shape is not drawn, it can be used to create holes within multiple-element patterns. The "rhombille_rhombus" shape draws a rhombus while the "tetrakis_left" or "tetrakis_right" shapes draw an isosceles right triangle. These latter three non-regular-polygon shapes are intended to help generate rhombille and tetrakis square tilings.

grid

Adjusts placement and density of certain graphical elements. "square" (default) is a square grid. "hex" is a hexagonal grid suitable for hexagonal and triangular tiling. "hex_circle" is a hexagonal grid suitable for circle packing. "elongated_triangle" is a grid used for the "elongated triangle" tiling.

type

Adjusts the repeating of certain aesthetics such as color. Can use any type in names_hex, names_square, or names_weave. See for pattern_hex(), pattern_square(), and pattern_weave() for more information about supported type arguments.

subtype

See for pattern_hex(), pattern_square(), and pattern_weave() for more information about supported subtype arguments.

rot

Angle to rotate regular polygon (degrees, counter-clockwise).

alpha

Alpha (between 0 and 1) or NA (default, preserves colors' alpha value).

linetype

Stroke linetype

linewidth

Stroke linewidth

size

For backwards compatibility can be used to set linewidth

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.

See also

grid.pattern_circle() for a special case of this pattern. The tiling vignette features more examples of regular polygon tiling using this function vignette("tiling", package = "gridpattern").

Examples

  if (require("grid")) {
    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))

    # 'density', 'rot', and 'shape' are vectorized
    grid.newpage()
    grid.pattern_regular_polygon(x_hex, y_hex, colour = "black",
                                 fill = c("blue", "yellow", "red"),
                                 shape = c("convex4", "star8", "circle"),
                                 density = c(0.45, 0.42, 0.4),
                                 spacing = 0.08, angle = 0)

    # checker pattern using "square" shape
    grid.newpage()
    grid.pattern_regular_polygon(x_hex, y_hex, shape = "square",
                                 colour = "transparent",
                                 fill = c("black", "red", "blue", "yellow"),
                                 angle = 0, density = 1.0, spacing = 0.2)

    # checker pattern using the default "convex4" shape
    grid.newpage()
    grid.pattern_regular_polygon(x_hex, y_hex, density = 1.0,
                                 colour = "black", fill = "blue")

    # using a "twill_zigzag" 'weave' pattern
    grid.newpage()
    grid.pattern_regular_polygon(x_hex, y_hex, fill = c("blue", "yellow"),
                                 shape = c("circle", "star8"),
                                 density = c(0.5, 0.6), type = "twill_zigzag")

    # hexagon tiling
    grid.newpage()
    grid.pattern_regular_polygon(x_hex, y_hex, color = "transparent",
                                 fill = c("white", "grey", "black"),
                                 density = 1.0, spacing = 0.1,
                                 shape = "convex6", grid = "hex")

    # triangle tiling
    grid.newpage()
    grid.pattern_regular_polygon(x_hex, y_hex, fill = "green",
                                 density = 1.0, spacing = 0.1,
                                 shape = "convex3", grid = "hex")

  }