Stretch a rectangle and maintain the area

I have a request for a tool that allows you to draw a rectangle, set the
area, then stretch or grip edit in one direction, and have the object shrink
in the other to maintain the area. What would truely be nice is the ability
to grip edit an edge, rather than an endpoint. We have ADT3.3 (4 to go
online soon) but are using it as RAW AutoCAD for now. Is there anything in
ADT that would help, or some code available as freeware/shareware? I could
do a tool that lets you stretch in one direction and updates the other, but
if there is something in the can already, especially something more robust
that what I could whip out, I would rather use it.

Best,
Gordon

 

the best analogy for this would be.. think of a ballon.. if you
flatten one side (direction) || .. the ballon will expand in the other
direction - - thus maintaining the overall volume (size).. follow?

 

Luis,
When placing (adding) spaces, you can lock one of the constraints
Width, Height, or Area. Unfortunately, the space modify command
does not allow the same level of control. But since it is relatively
easy to add spaces, it could be a close substitute to what Gordon
wants(without programming).

Gordon,
It would also be possible to implement with reactors, though it
probably wouldn't be that easy to do.

Regards,
Doug

 

I understand that. I was focusing on his request to "grip edit an edge".
Under those circumstances, you can only move it, not change its length.
Therefore, the operation resembles a Move. But now I realize he wanted more
than that.

 

Gordon

Here is my first attempt at you request.
You may select a rectangle, it must be a closed LWpline.
The old rectangle is left untouched but could be deleted.
At this time the lower left corner of the rectangle is the anchor point

http://theswamp.org/phpBB2/viewtopic.php?p=46710#46710