hexpolygon

From hexbin v1.27.1 by Edzer Pebesma

Hexagon Coordinates and Polygon Drawing

Simple ‘low-level’ function for computing and drawing hexagons. Can be used for ‘grid’ (package grid) or ‘traditional’ (package graphics) graphics.

Keywords: dplot, aplot

Usage

hexcoords(dx, dy = NULL, n = 1, sep = NULL)
hexpolygon(x, y, hexC = hexcoords(dx, dy, n = 1), dx, dy = NULL,
           fill = 1, border = 0, hUnit = "native", ...)

Arguments

dx,dy: horizontal and vertical width of the hexagon(s).
n: number of hexagon “repeats”.
sep: separator value to be put between coordinates of different hexagons. The default, NULL doesn't use a separator.
x,y: numeric vectors of the same length specifying the hexagon centers around which to draw.
hexC: a list as returned from hexcoords(). Its component no.sep determines if grid or traditional graphics are used. The default (via default of hexcoords) is now to use grid graphics.
fill,border: passed to grid.polygon (for grid).
hUnit: string or NULL determining in which units (x,y) values are.
…: further arguments passed to polygon (for graphics).

Value

hexcoords() returns a list with components

x,y

numeric vectors of length \(n \times 6\) (or \(n \times 7\) if sep is not NULL) specifying the hexagon polygon coordinates (with sep appended to each 6-tuple).

no.sep

a logical indicating if sep was NULL.

hexpolygon returns what its last grid.polygon(.) or polygon(.) call returns.

Examples

library(hexbin)

# NOT RUN {
str(hexcoords(1, sep = NA))  # multiple of (6 + 1)
str(hexcoords(1, sep = NULL))# no separator -> multiple of 6
# }
# NOT RUN {
## hexpolygon()s:
x <- runif(20, -2, 2)
y <- x + rnorm(20)

## 1) traditional 'graphics'
plot(x,y, asp = 1, "plot() + hexpolygon()")
hexpolygon(x,y, dx = 0.1, density = 25, col = 2, lwd = 1.5)

## 2) "grid" :

addBit <- function(bnds, f = 0.05) bnds + c(-f, f) * diff(bnds)
sc <- addBit(rxy <- range(x,y))# same extents (cheating asp=1)
library("grid")
grid.newpage()
pushViewport(plotViewport(.1+c(4,4,2,1), xscale = sc, yscale = sc))
grid.rect()
grid.xaxis()
grid.yaxis()
grid.points(x,y)
hexpolygon(x,y, hexcoords(dx = 0.1, sep=NULL), border = "blue", fill=NA)
popViewport()
# }

Documentation reproduced from package hexbin, version 1.27.1, License: GPL-2

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