Convert Window Back To Rectangle

Description

Determines whether the given window is really a rectangle aligned with the coordinate axes, and if so, converts it to a rectangle object.

Usage

 rescue.rectangle(W)

Arguments

Details

This function decides whether the window W is actually a rectangle aligned with the coordinate axes. This will be true if W is

• a rectangle (window object of type "rectangle");
• a polygon (window object of type "polygonal" with a single polygonal boundary) that is a rectangle aligned with the coordinate axes;
• a binary mask (window object of type "mask") in which all the pixel entries are TRUE.

If so, the function returns this rectangle, a window object of type "rectangle". If not, the function returns W.

Value

Another object of class "owin" representing the same window.

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

as.owin, owin.object

Examples

  w <- owin(poly=list(x=c(0,1,1,0),y=c(0,0,1,1)))
  rw <- rescue.rectangle(w)

  w <- as.mask(unit.square())
  rw <- rescue.rectangle(w)