Straighthen and Arch
Menu:
Geometry.Straigthen top
Geometry.Straigthen base
Geometry.Arch
Tcl routine:
straightenbase
straightentop
archbase
Description
A single stranded part can be easily made into a straight line by selecting
(a base of) it, and invoke the straighthen menu. If a base of a helix is
selected, the single stranded areas at the top (Straigthen top) or at the
bottom (Straigthen bottom) of the helix will be straightend. A single
stranded area can also be made to take a slightly curved form using the
'Arch' menu.