Add a Legend to a Hexbin Plot

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Description

Plots the legend for the plot method of hexbin. Provides a legend indicating the count representations.

Usage

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grid.hexlegend(legend, ysize, lcex, inner, style = ,
  	   minarea = 0.05, maxarea = 0.8, mincnt = 1, maxcnt, trans = NULL,
	   inv = NULL, colorcut, density = NULL, border = NULL, pen = NULL,
	   colramp = function(n) { LinGray(n,beg = 90,end = 15) },
           leg.unit = "native")

Arguments

legend

positive number giving width of the legend in inches.

ysize

height of legend in inches

lcex

the characters expansion size for the text in the legend, see par(cex=).

inner

the inner diameter of a hexagon in inches.

style

the hexagon style; see grid.hexagons.

minarea, maxarea

fraction of the cell area for the lowest and largest count, respectively.

mincnt, maxcnt

minimum and maximum count accepted in plot.

trans

a transformation function for the counts such as sqrt.

inv

the inverse transformation function.

colorcut

numeric vector of values covering [0, 1] the determine hexagon color classes boundaries and hexagon legend size boundaries.

border

argument for polygon(). Draw the border for each hexagon.

density

argument for polygon() filling. A 0 causes the polygon not to be filled.

pen

color argument used for polygon(col = .). Determines the color with which the polygon will be filled.

colramp

function accepting an integer n as an argument and returning n colors.

leg.unit

unit to use

Details

The plot method for hexbin objects calls this function to produce a legend by setting the graphics parameters, so hex.legend itself is not a standalone function.

The legend function is preliminary. Later version will include refinements and handle extreme cases (small and large) for cell size and counts.

See the Details section of grid.hexagons's help page.

Value

This function does not return any value.

Author(s)

Dan Carr <dcarr@voxel.galaxy.gmu.edu>

ported by Nicholas Lewin-Koh <kohnicho@comp.nus.edu.sg>

References

see in grid.hexagons.

See Also

hexbin, grid.hexagons, smooth.hexbin, erode.hexbin, hcell2xy, gplot.hexbin,

Examples

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## Not a stand alone function; typically only called from plot.hexbin()


## Not run: 
  grid.hexlegend(legend = 2, ysize = 1,lcex=8,inner=0.2,
                 maxcnt = 100, colorcut = c(0.5,0.5))

## End(Not run)

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