hexGraphPaper: Create a Hexgon Grid

Description

Creates a hexagon grid that can be added to a plot created with grid graphics.

Usage

hexGraphPaper(hb, xbnds = NULL, ybnds = NULL, xbins = 30, shape = 1,
              add = TRUE, fill.edges = 1, fill = 0, border = 1)
hgridcent(xbins, xbnds, ybnds, shape, edge.add = 0)

Arguments

a object of class "hexbin", typically produced by hexbin(*).

xbnds, ybnds

horizontal and vertical limits of the binning region in x or y units respectively; must be numeric vector of length 2.

xbins

the number of bins partitioning the range of xbnds.

shape

the shape = yheight/xwidth of the plotting regions.

add

a logical value indicating whether or not to add the grid to the current plot.

fill.edges

integer number of hexagons to add around the border

fill

the fill color for the hexagons

border

the color of the border of the hexagons

edge.add

offset (typically fill.edges above) used in hgridcent.

Value

Invisibly returns a list with th following components
xThe x coordinates of the grid
ythe y coordinates of the grid
dimena vector of length 2 gining the rows and columns of the grid
dxthe horizontal diameter of the hexagons
dythe vertical diameter of the hexagons

Details

If a hexbin object is given then the parameters xbins and shape are ignored. Different bounds can still be specified. The fill.edges parameter should be an integer. fill.edges takes the current grid and adds a layer of hexagons around the grid for each level of fill. So for example if fill.edges= 2 than the dimensions of the grid would be (i,j)+4.

hgridcent() is the utility function computing the resulting list (see section Value).

WARNING! If using a hexVP be sure to set clip to "on", otherwise the hexagon grid will bleed over the plot edges.

Examples

Run this code

x <- rnorm(10000)
 y <- rnorm(10000,x,x)
 hbin <- hexbin(x,y)
 hvp <- plot(hbin,type="n")
 pushHexport(hvp$plot,clip="on")
 hexGraphPaper(hbin,border=grey(.8))
 grid.hexagons(hbin)

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