`grid.pattern_circle()`

draws a circle pattern onto the graphic device.

## Usage

```
grid.pattern_circle(
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,
units = "snpc",
alpha = gp$alpha %||% NA_real_,
linetype = gp$lty %||% 1,
linewidth = size %||% gp$lwd %||% 1,
size = NULL,
grid = "square",
type = NULL,
subtype = 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(s).

- fill
Fill colour(s) or

`grid::pattern()`

/ gradient object(s).- angle
Rotation angle in degrees.

- density
Approx. fraction of area the pattern fills.

- spacing
Spacing between repetitions of pattern (in

`units`

units).- xoffset
Shift pattern along x axis (in

`units`

units).- yoffset
Shift pattern along y axis (in

`units`

units).- units
`grid::unit()`

units for`spacing`

,`xoffset`

, and`yoffset`

parameters.- 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`

.- 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.- 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

See `grid.pattern_regular_polygon()`

for a more general case of this pattern.

## Examples

```
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_circle(x_hex, y_hex, fill = c("blue", "yellow"), density = 0.5)
grid::grid.newpage()
grid.pattern_circle(x_hex, y_hex, density = 0.8, grid = "hex_circle",
gp = grid::gpar(fill = c("blue", "yellow", "red")))
grid::grid.newpage()
grid.pattern_circle(x_hex, y_hex, density = 1.2, grid = "hex_circle",
gp = grid::gpar(fill = c("blue", "yellow", "red")))
# using a "twill_zigzag" 'weave' pattern
grid::grid.newpage()
grid.pattern_circle(x_hex, y_hex, fill = "blue", density = 0.5, type = "twill_zigzag")
```