incircle {spatstat.geom}

Find Largest Circle Inside Window

Description

Find the largest circle contained in a given window.

Usage

incircle(W)

inradius(W)

Arguments

W

A window (object of class "owin").

Details

Given a window W of any type and shape, the function incircle determines the largest circle that is contained inside W, while inradius computes its radius only.

For non-rectangular windows, the incircle is computed approximately by finding the maximum of the distance map (see distmap) of the complement of the window.

Value

The result of incircle is a list with entries x,y,r giving the location (x,y) and radius r of the incircle.

The result of inradius is the numerical value of radius.

Author(s)

Adrian Baddeley [e-mail]

and Rolf Turner [e-mail]

See Also

centroid.owin

Examples

  W <- square(1)
  Wc <- incircle(W)
  plot(W)
  plot(disc(Wc$r, c(Wc$x, Wc$y)), add=TRUE)

  plot(letterR)
  Rc <- incircle(letterR)
  plot(disc(Rc$r, c(Rc$x, Rc$y)), add=TRUE)

  W <- as.mask(letterR)
  plot(W)
  Rc <- incircle(W)
  plot(disc(Rc$r, c(Rc$x, Rc$y)), add=TRUE)