shift.im {spatstat} | R Documentation |
Applies a vector shift to a pixel image
## S3 method for class 'im' shift(X, vec=c(0,0), ..., origin=NULL)
X |
Pixel image (object of class |
vec |
Vector of length 2 representing a translation. |
... |
Ignored |
origin |
Character string determining a location
that will be shifted to the origin. Options are
|
The spatial location of each pixel in the image
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 image window will be
shifted to the origin. If origin="midpoint"
then the centre of
the bounding rectangle of the image will be shifted to the origin.
If origin="bottomleft"
then the bottom left corner of the
bounding rectangle of the image will be shifted to the origin.
Another pixel image (of class "im"
) representing the
result of applying the vector shift.
Adrian Baddeley Adrian.Baddeley@csiro.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner r.turner@auckland.ac.nz
# make up an image X <- setcov(unit.square()) plot(X) Y <- shift(X, c(10,10)) plot(Y) # no discernible difference except coordinates are different shift(X, origin="mid")