The position of paths is indeed set by the matrix, and only in that way.
Things to watch out for
- be sure you understand how to work with ASFixedMatrix objects (the elements cannot be set directly as integers or reals).
- be sure you understand how PDF matrixes work
- remember that the matrix origin may not be the bottom left of the page; elements are only visible if they are in the rectangle defined by the CropBox, or if there is no CropBox, the MediaBox