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.