I feel silly. I want my lisp routine to give me the choice between
picking a point with the mouse or entering from the keyboard.
if I digitize, I just want one component - in this case the Y, or the
elevation in my small little mind.
so if I enter it might be "72" that I would type, top of windows
usuallly being 6'-10" above finished floor. (one application)
this should be real easy, brain flatulance.
I'm tired of copying my roof pitches, I want to pick a wall on my
elevations for the X, give it the Y, overhang and pitch, and let the
routine draw the rest.