AutoLISP vs Visual LISP Part 4 - Code Example (Visual LISP)
And here's the 'Visual' version of the code.
Note that this routine works 'okay' (both versions for that matter). But the code could really use some refinement. If I get enough interest (in other words, enough people see a need for a 'lengthen-from-center' command) I'm keen on continuing this series on and refining the code to a point where it's suitable for everyday usage. Add a comment below if that sounds like a good idea.