An affine matrix is composed of translation, scale, skew and rotation transformations. This function extracts these components, after first inverting the matrix so that it transforms from source to target space.
decomposeAffine(affine)A list with components:
A 3x3 matrix representing only the scale operation embodied in the full affine transformation.
A 3x3 matrix representing only the skew operation embodied in the full affine transformation.
A 3x3 matrix representing only the rotation operation embodied in the full affine transformation.
A length-3 named numeric vector representing the
translations (in pixunits units) in each of the X, Y and
Z directions.
A length-3 named numeric vector representing the scale factors in each of the X, Y and Z directions. Scale factors of 1 represent no effect.
A length-3 named numeric vector representing the skews in each of the XY, XZ and YZ planes.
A length-3 named numeric vector representing the rotation angles (in radians) about each of the X, Y and Z directions, i.e., roll, pitch and yaw.
A 4x4 matrix representing an affine transformation matrix.
Jon Clayden <code@clayden.org>
buildAffine, isAffine