R: Optimal Shape Parameter for Hexbin Viewport

optShape {hexbin} | R Documentation

## Optimal Shape Parameter for Hexbin Viewport

### Description

Takes a viewport or a given height and width and returns the shape parameter that will fill the specified plotting region with the appropriately shaped hexagons. If margins are specified the margins are subtracted from height and width before the shape parameter is specified.

### Usage

    optShape(vp, height = NULL, width = NULL, mar = NULL)

### Arguments

`vp` | a `viewport` object, optional see details
`height` | the height of the plotting region, can be numeric or units
`width` | The width of the plotting region, can be numeric or units
`mar` | A four element numeric or units vector describing the margins in the order `c(bottom, left, top, right)`

### Value

a scalar numeric value specifiyng `shape`.

### Warning

If a viewport is given as an argument it should already be pushed on the graphics device or it will have null units and a meaningless shape parameter will be returned.

### Author(s)

Nicholas Lewin-Koh

### See Also

`hexViewport`, `hexVP-class`, `hexbin`

### Examples

    x <- rgamma(10000,.9)
    m <- as.logical(rbinom(10000,1,.17))
    x[m] <- -x[m]
    y <- rnorm(x,abs(x))
    library("grid")
    vp <- plotViewport(xscale= range(x)+c(-.5,.5),
                       yscale= range(y)+c(-.5,.5),
                 default.units = "native")
    grid.newpage()
    pushViewport(vp)
    grid.rect()
    shape <- optShape(vp)
    shape
    hb <- hexbin(x,y,xbins=40,shape=shape)
    grid.hexagons(hb,colramp=BTY)

[Package hexbin version 1.28.1 Index]