spatstat (version 1.23-1)

shift.owin: Apply Vector Translation To Window

Description

Applies a vector shift to a window

Usage

## S3 method for class 'owin':
shift(X, vec=c(0,0), ..., origin=NULL)

Arguments

X

Window (object of class "owin").

vec

Vector of length 2 representing a translation.

...

Ignored

origin

Character string determining a location that will be shifted to the origin. Options are "centroid", "midpoint" and "bottomleft". Partially matched.

Value

• Another window (of class "owin") representing the result of applying the vector shift.

Details

The window is translated by the vector vec. This is a method for the generic function shift.

If origin is given, then it should be one of the character strings "centroid", "midpoint" or "bottomleft". The argument vec will be ignored; instead the shift will be performed so that the specified geometric location is shifted to the origin. If origin="centroid" then the centroid of the window will be shifted to the origin. If origin="midpoint" then the centre of the bounding rectangle of the window will be shifted to the origin. If origin="bottomleft" then the bottom left corner of the bounding rectangle of the window will be shifted to the origin.

See Also

shift, shift.ppp, periodify, rotate, affine, centroid.owin

Examples

W <- owin(c(0,1),c(0,1))
  X <- shift(W, c(2,3))
  plot(W)
  # no discernible difference except coordinates are different
  shift(W, origin="mid")