affine.owin

From spatstat v1.25-5 by Adrian Baddeley

Apply Affine Transformation To Window

Applies any affine transformation of the plane (linear transformation plus vector shift) to a window.

Keywords: spatial, math

Usage

## S3 method for class 'owin':
affine(X, mat=diag(c(1,1)), vec=c(0,0), ..., rescue=TRUE)

Arguments

X: Window (object of class "owin").
mat: Matrix representing a linear transformation.
vec: Vector of length 2 representing a translation.
rescue: Logical. If TRUE, the transformed window will be processed by rescue.rectangle.
...: Optional arguments passed to as.mask controlling the pixel resolution of the transformed window, if X is a binary pixel mask.

Details

The window is subjected first to the linear transformation represented by mat (multiplying on the left by mat), and then the result is translated by the vector vec. The argument mat must be a nonsingular $2 \times 2$ matrix.

This is a method for the generic function affine.

Value

Another window (of class "owin") representing the result of applying the affine transformation.

Examples

# shear transformation
  shear <- matrix(c(1,0,0.6,1),ncol=2)
  X <- affine(owin(), shear)
  plot(X)
  data(letterR)
  affine(letterR, shear, c(0, 0.5))
  affine(as.mask(letterR), shear, c(0, 0.5))

Documentation reproduced from package spatstat, version 1.25-5, License: GPL (>= 2)

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