invoke.symbolmap

From spatstat v1.41-1 by Adrian Baddeley

Plot Data Using Graphics Symbol Map

Apply a graphics symbol map to a vector of data values and plot the resulting symbols.

Keywords: hplot, spatial

Usage

invoke.symbolmap(map, values, x, y = NULL, ..., add = FALSE,
               do.plot = TRUE, started = add && do.plot)

Arguments

map: Graphics symbol map (object of class "symbolmap").
values: Vector of data that can be mapped by the symbol map.
x,y: Coordinate vectors for the spatial locations of the symbols to be plotted.
...: Additional graphics parameters.
add: Logical value indicating whether to add the symbols to an existing plot (add=TRUE) or to initialise a new plot (add=FALSE, the default).
do.plot: Logical value indicating whether to actually perform the plotting.
started: Logical value indicating whether the plot has already been initialised.

Details

A symbol map is an association between data values and graphical symbols.

This command applies the symbol map map to the data values and plots the resulting symbols at the locations given by xy.coords(x,y).

Value

(Invisibly) the maximum diameter of the symbols, in user coordinate units.

Examples

g <- symbolmap(range=c(-1,1),
                   shape=function(x) ifelse(x > 0, "circles", "squares"),
                   size=function(x) sqrt(ifelse(x > 0, x/pi, -x))/15,
                   bg=function(x) ifelse(x > 0, "green", "red"))
  plot(square(1), main="")
  a <- invoke.symbolmap(g, runif(10, -1, 1), runifpoint(10), add=TRUE)
  a

Documentation reproduced from package spatstat, version 1.41-1, License: GPL (>= 2)

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