grid.points               package:grid               R Documentation

Draw Data Symbols

Description:

     These functions create and draw data symbols.

Usage:

     grid.points(x = runif(10),
                 y = runif(10)),
                 pch = 1, size = unit(1, "char"),
                 default.units = "native", name = NULL,
                 gp=gpar(), draw = TRUE, vp = NULL)
     pointsGrob(x = runif(10),
                 y = runif(10)),
                 pch = 1, size = unit(1, "char"),
                 default.units = "native", name = NULL,
                 gp=gpar(), vp = NULL)

Arguments:

       x: A numeric vector or unit object specifying x-values.

       y: A numeric vector or unit object specifying y-values.

     pch: A numeric or character vector indicating what sort of
          plotting symbol to use.

    size: A unit object specifying the size of the plotting symbols.

default.units: A string indicating the default units to use if 'x' or
          'y' are only given as numeric vectors.

    name: A character identifier. 

      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:

     Both functions create a points grob (a graphical object describing
     points), but only 'grid.points' draws the points (and then only if
     'draw' is 'TRUE').

Value:

     A points grob.  'grid.points' returns the value invisibly.

Author(s):

     Paul Murrell

See Also:

     Grid, 'viewport'

