Pos.TOP_LEFT, Pos.TOP_CENTER, Pos.TOP_RIGHT, Pos.CENTER_LEFT, Pos.CENTER, Pos.CENTER_RIGHT, Pos.BOTTOM_LEFT, Pos.BOTTOM_CENTER, Pos.BOTTOM_RIGHT. Only three of them male effect.

Run attached project, take scene into focus and start to press "LeftArrow" button on keyboard for at least 10 times. According code, alignment changes according to elements of list of possible alignments, which I wrote above. Only three on them make visible effect (something like left top, left center, left bottom).