simple/complicated customization

I intend to make my own version of the base cad commands: Move, Copy,
Circle, Line, Fillet and Chamfer. I already have my own version of the
Offset command. (If you are curious, the point to all this is to enable
the use to enter imperial sizes in metric drawings (ie: 1'-5"), with out
having to switch units.)

What I need is:
- the base variables being used in these commands, so I can "display"
them in the same manner as the original.
- a way to "draw" a circle without actually drawing a circle (for
clarification of this, explore the radius/diameter/2p/3p circle
options.. it is displayed as you go through the commands).

I am hoping that at least a few of you know this info, as I can't be the
first person to make clones of these commands (can I?).

TIA.

 

Might want to explore the 'cal function.

Jesse

 

Try looking into the Distof function

CJ

isfoot subinch subfoot desscale)

 

distof = gold

that will help alot..Thank you.

though this does not relate at all to my reason for posting.