UDEutils.py

def getOffsets(big_length, small_length, grid):
    """
    return the lowest/highest offsets, if a shape of small length is
    rendered and centered inside a larger shape length 

    Returns:
        An OffsetInfo object with the following attributes:
            loffset  - lowest offset
            hoffset  - highest offset
    """
    offset = big_length - small_length
    hoffset = snap2Grid(offset / 2.0, grid)
    loffset = snap2Grid(offset - hoffset, grid)
    if loffset > hoffset:
        (loffset, hoffset) = (hoffset, loffset)
    
    # assemble OffsetInfo object
    class OffsetInfo:
        pass
    oi = ContactInfo()
    oi.loffset = loffset
    oi.hoffset = hoffset

    return oi