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affine.owin

Apply Affine Transformation To Window

Description

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

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 * 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.

Author(s)

and Rolf Turner r.turner@auckland.ac.nz

See Also

Examples

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

Geometrical Functionality of the 'spatstat' Family

v2.1-0
GPL (>= 2)
Authors
Adrian Baddeley [aut, cre], Rolf Turner [aut], Ege Rubak [aut], Tilman Davies [ctb], Ute Hahn [ctb], Abdollah Jalilian [ctb], Sebastian Meyer [ctb], Suman Rakshit [ctb], Dominic Schuhmacher [ctb], Rasmus Waagepetersen [ctb]
Initial release
2021-04-15

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