grid.circle {grid}R Documentation

Draw a Circle

Description

This function draws a circle.

Usage

grid.circle(x=0.5, y=0.5, r=0.5, default.units="npc",
            gp=gpar(), draw=TRUE, vp=NULL)

Arguments

x A numeric vector or unit object specifying x-locations.
y A numeric vector or unit object specifying y-locations.
r A numeric vector or unit object specifying radii.
default.units A string indicating the default units to use if x, y, width, or height are only given as numeric vectors.
gp An object of class gpar, typically the output from a call to the function gpar. This is basically a list of graphical parameter settings.
draw A logical value indicating whether graphics output should be produced.
vp A Grid viewport object (or NULL).

Details

The radius may be given in any units; if the units are relative (e.g., "npc" or "native") then the radius will be different depending on whether it is interpreted as a width or as a height. In such cases, the smaller of these two values will be the result. To see the effect, type grid.circle() and adjust the size of the window.

The "grob" object contains an object of class "circle".

Value

An object of class "grob".

Author(s)

Paul Murrell

See Also

Grid, viewport

Examples






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