React on direction

Is it posible to let lisp react on direction. What i mean is;

If I use (getpoint pnt "\nDirection: ") I want to send text to the
commandline before giving the actual point. When just moving the crosshair
perpendicular or in the same direction to a certain line from witch i have
the coordinates.

Is this posible?

Regards MJ

 

If I understand what you're trying to do correctly: yes. You can use
(entget (car (entsel))) to select the line and get its association list,
then set the SNAPBASE to one end, (assoc 10) or (assoc 11), and rotate the
snap angle to the other end. Then turn ortho on.

Kent Cooper, AIA


...

 

Here's an excerpt from my door-insertion routine that does this in a
different way, using Nearest Osnap to find two points on the line, rather
than dxf codes 10 and 11 to find the endpoints. One of those two points is
then the base-point for the rubber-band line that appears for the last
prompt.
....
(setq wallline (entsel "HINGEPOINT ON WALL: ")) \+
(setq hinge (osnap (cadr wallline) "NEA")) +
(setq rot (angle hinge (osnap (getpoint +
"DIRECTION TO OTHER SIDE OF DOOR: ") "NEA"))) \+
SNAP R !hinge !rot ORTHO ON +
(setq dir (getangle hinge "OPENING DIRECTION: ")) \
....

[Earlier in the routine it saves the current Snap basepoint and rotation,
and the Ortho state, and it restores those later.]

Kent Cooper, AIA


...

 

Thanx for your input but this is not what i mean..

What i mean is when using (getpoint pnt "\nDirection: ") there is a "line"
between the crosshairs and the given pnt. I want to send remarks to the
command line at the time i'm moving the crosshairs in the same or
perpendicular direction (ortho has to be on) of the line I earlier selected
in the routine and from wich i obtained the coordinates using entsel.

I was thinking more of the grread command but am not completely sure on how
to use it. If I am correct it has to be possible to send streaming input
like coordinates to a variable en use it to determain the direction in
opposite of this line.

Regards MJ

 

Does the coordinates section of the status line at the bottom show what you
want? Experiment with the F6 button and/or the COORDS command to have it
display streaming relative or absolute coordinates.

I poked around with grread, but couldn't quite figure it out either,
couldn't get anything to rubber-band in connection with it, and don't see
any way to have it feed streaming content to the Command line, but that
coordinates display does "stream" as you move the cursor around (or can,
with COORDS set right). Then you can easily save the coordinates at the
time you pick a point, using getpoint, which you can rubber-band from a
previously saved point, and its rubber band obeys Ortho.

Or, if what you want to establish is just the opposite direction, you can
use getangle to save an angle instead of a point, and add pi radians to it.
Getangle also rubber-bands and obeys ortho.

In any case, I don't think it would be possible to "send streaming input
like coordinates to a variable." The variable has to store something fixed,
like a point or an angle, so "streaming" doesn't mean anything except as
displayed along the way, until you pick somewhere to fix a value to store in
the variable.

Kent Cooper, AIA


...