(v13) HqnImpose2 FromList tactic

This page applies to Harlequin v13.1r0 and later; both Harlequin Core and Harlequin MultiRIP.

The pages are assumed to be laid out in a regular, rectangular grid with uniform sizes in the same way as they are for /RightToLeft and so on. The order of pages within the grid is, however, defined by a pre-generated list. The list may be supplied in the call to HqnInitImpose, but it is created by an objective in most cases (for example, in the way that the /Halved objective does).

The list is stored in a dictionary called PageOrder with integer keys in much the same way that the PageList dictionary uses the /PassThrough objective. In this case each value is a two-element array where the elements are x-position and y-position, where page [0 0] is the top left corner of the sheet.

Such a dictionary might be of the form:

            /PageOrder <<
            0 [ 0 0 ]1 [ 1 1 ]2 [ 0 1 ]3 [ 1 0 ]
            >> def

The PageOrder dictionary must be in global VM.