Compute a Grid Viewport for Hexagon / Hexbin Graphics

Builds a grid viewport for hexagon or hexbin graphics. This builds on the concepts of the grid package, see viewport.

<!-- % see ../R/hexViewport.R -->
hexViewport(x, offset = unit(0,"inches"), mar = NULL,
	    xbnds = NULL, ybnds = NULL, newpage = FALSE,
            clip = "off", vp.name = NULL)

Arguments

x

a hexbin object.

offset

a unit object.

mar

margins as units, of length 4 or 1.

xbnds, ybnds

bounds for x- and y- plotting range; these default to the corresponding slots of x.

newpage

logical indicating if a new graphics page should be openend, i.e., grid.newpage().

clip

simply passed to viewport().

vp.name

name of viewport; defaults to random name.

Value

an S4 object of class "hexVP", see hexVP-class for more, with its main slot hexVp a viewport for grid graphics.

See also

viewport and the main “handlers” pushHexport and popViewport; further gplot.hexbin and hboxplot which build on hexViewport.

Examples

set.seed(131)
x <- rnorm(7777)
y <- rt   (7777, df=3)

## lower resolution binning and overplotting with counts
bin <- hexbin(x,y,xbins=25)
P <- plot(bin)
xy <- hcell2xy(bin)
pushHexport(P$plot.vp)
i <- bin@count <= 3
library("grid")
grid.text(as.character(bin@count[i]), xy$x[i], xy$y[i],
          default.units = "native")
grid.points(x[1:20],y[1:20]) # to show some points rather than counts
popViewport()