Bounding Box of a Window or Point Pattern

Description

Find the smallest rectangle containing a given window(s) or point pattern(s).

Usage

 bounding.box(...)

Arguments

Details

This function finds the smallest rectangle (with sides parallel to the coordinate axes) that contains all the given objects.

For a window (object of class "owin"), the bounding box is the smallest rectangle that contains all the vertices of the window (this is generally smaller than the enclosing frame, which is returned by as.rectangle).

For a point pattern (object of class "ppp"), the bounding box is the smallest rectangle that contains all the points of the pattern, and is computed by bounding.box.xy.

For a pixel image (object of class "im"), the image will be converted to a window using as.owin, and the bounding box of this window is obtained.

If the argument is a list of several objects, then this function finds the smallest rectangle that contains all the bounding boxes of the objects.

Value

A window (object of class "owin") of type "rectangle" representing a rectangle.

Author(s)

Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner rolf@math.unb.ca http://www.math.unb.ca/~rolf

See Also

owin, as.owin, as.rectangle bounding.box.xy

Examples

  w <- owin(c(0,10),c(0,10), poly=list(x=c(1,2,3,2,1), y=c(2,3,4,6,7)))
  r <- bounding.box(w)
  # returns rectangle [1,3] x [2,7]

  w2 <- unit.square()
  r <- bounding.box(w, w2)
  # returns rectangle [0,3] x [0,7]