Apply Affine Transformation
Applies any affine transformation of the plane (linear transformation plus vector shift) to a plane geometrical object, such as a point pattern or a window.
affine(X, mat=diag(c(1,1)), vec=c(0,0))
- Any suitable dataset representing a two-dimensional
object, such as a point pattern (object of class
"ppp"), or a window (object of class
- Matrix representing a linear transformation.
- Vector of length 2 representing a translation.
First the linear transformation represented by
mat is applied (multiplying on the left by
and then the result is translated by the vector
mat must be a nonsingular $2 \times 2$
- Another object of the same type, representing the result of applying the affine transformation.
data(cells) # shear transformation X <- affine(cells, matrix(c(1,0,0.6,1),ncol=2)) plot(X) # rescale y coordinates by factor 1.3 plot(affine(cells, diag(c(1,1.3))))