pattern_hex: Hex pattern matrix

In gridpattern: 'grid' Pattern Grobs

Hex pattern matrix

Description

pattern_hex() returns an integer matrix indicating where each color (or other graphical element) should be drawn on a (horizontal) hex grid for a specified hex pattern type and subtype. names_hex lists the currently supported hex types.

Usage

pattern_hex(type = "hex", subtype = NULL, nrow = 5L, ncol = 5L)

names_hex

Arguments

type	Currently just supports "hex".
subtype	An integer indicating number of colors (or other graphical elements).
nrow	Number of rows (height).
ncol	Number of columns (width).

Format

An object of class character of length 5.

Details

"hex"

Attempts to use a uniform coloring if it exists. For subtype 1L, 2L, and 3L we use the "hex1" pattern. For subtype 4L we use the "hex2" pattern. For subtype 7L we use the "hex3" pattern. Else a uniform coloring does not exist and we use the "hex_skew" pattern.

"hex1"

Provides the 1-uniform colorings of a hexagonal tiling. Only exists for subtype 1L, 2L, or 3L.

"hex2"

Provides the 2-uniform colorings of a hexagonal tiling. Only exists for subtype 2L or 4L.

"hex3"

Provides the 3-uniform colorings of a hexagonal tiling. Only exists for subtype 2L or 7L.

"hex_skew"

For the "hex_skew" type we cycle through subtype elements on the horizontal line and "main" diagonal line. For some subtype numbers this may lead to noticeable color repeats on the "skew" diagonal line. If subtype is strictly greater than 2L then a hexagon should never touch another hexagon of the same color.

Value

A matrix of integer values indicating where the each color or other graphical elements should be drawn on a horizontal hex grid (i.e. hexagons are assumed to be pointy side up). Indices ⁠[1,1]⁠ of the matrix corresponds to the bottom-left of the grid while indices ⁠[1,ncol]⁠ corresponds to the bottom-right of the grid. The even rows are assumed to be on the left of the ones on the odd rows (for those in the same column in the matrix). This matrix has a "pattern_hex" subclass which supports a special print() method.

See Also

grid.pattern_regular_polygon() for drawing to a graphics device hexagons, triangles, circles, etc. in hexagon patterns. The tiling vignette features several examples of regular polygon tiling using this both the "hex" and "hex_circle" types vignette("tiling", package = "gridpattern"). For more information on uniform colorings of a hexagonal tiling see https://en.wikipedia.org/wiki/Hexagonal_tiling#Uniform_colorings.

Examples

 # supported hex names
 print(names_hex)

 # 1-uniform 3-color
 hex_3color <- pattern_hex("hex1", 3L, nrow = 7L, ncol = 9L)
 print(hex_3color)

 # 2-uniform 4-color
 hex_4color <- pattern_hex("hex2", 4L, nrow = 7L, ncol = 9L)
 print(hex_4color)

gridpattern documentation built on April 3, 2025, 11:28 p.m.