spatstat.geom (version 3.7-0)

shift.im: Apply Vector Translation To Pixel Image

Description

Applies a vector shift to a pixel image

Usage

# S3 method for im
shift(X, vec=c(0,0), ..., origin=NULL)

Value

Another pixel image (of class "im") representing the result of applying the vector shift.

Details

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, the argument vec will be ignored; instead the shift will be performed so that the specified geometric location is shifted to the coordinate origin \((0,0)\). The argument origin should be either a numeric vector of length 2 giving the spatial coordinates of a location, or one of the character strings "centroid", "midpoint", "left", "right", "top", "bottom", "topleft", "bottomleft", "topright" or "bottomright" (partially matched). 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, and so on.

See Also

shift

Examples

 # 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="c")