6.2 Functions working on a box list

circlealignequal(boxes, a, dx, dy):
Performs a circle alignment of the boxes boxes using the parameters a, dx, and dy as in the circlealign method. For the length of the alignment vector its largest value is taken for all cases.
linealignequal(boxes, a, dx, dy):
as above, but performing a line alignment
tile(boxes, a, dx, dy):
tiles the boxes boxes with a distance a between the boxes (in addition the maximal box extent in the given direction (dx, dy) is taken into account)