shift.psp: Apply Vector Translation To Line Segment Pattern

Description

Applies a vector shift to a line segment pattern.

Usage

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

Arguments

Line Segment pattern (object of class "psp").

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 line segment pattern (of class "psp") representing the result of applying the vector shift.

Details

The line segment pattern, and its window, are 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.

Examples

Run this code

X <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
  plot(X, col="red")
  Y <- shift(X, c(0.05,0.05))
  plot(Y, add=TRUE, col="blue")

  shift(Y, origin="mid")

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