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Darryl Collins · Guest

I am wondering if it is possible to use the perpendicular snap somehow to
draw one line perpendicular to a base line from a specific point. I am
usually doing this when I lay out curves for a road. I know my pc or pt
point and want my line to be perpendicular from this point. Any help will
be appreciated.

--
Dennis Rich
D.T. Collins & Associates
1042 Mechem Drive
Ruidoso, NM 88345
(505) 258-5272

Dean Saadallah · Guest

PERP is a TO selection option, not a FROM selection option: rotating your
crosshairs to match the angle you want to start from using SNAPANG command
and turning ORTHO on gives you the 90degree effect you seek instead.

--
Dean Saadallah
Add-on products for LT
http://www.pendean.com/lt
--

OLD-CADaver · Guest

<<not a FROM selection option>>

hmmm... works fer me.

Draw a line at some squirrly angle, the draw a circle out away from it.

Then start a line, select perp, pick the first line, then CEN the circle. The result should be a line perpendicular from the first line through the center of the circle.

Allen Jessup · Guest

If you draw in this order the following will work. It does not use eh Perp
snap.

Draw the tangent coming into the curve. After drawing that line start the
arc command. When is asks for start point. You will now be drawing an arc
tangent to the line you just drew.

After drawing the arc start a Line command. At start point hit enter. You
will now be drawing a line tangent to the arc.

The commands must follow one after the other. If you do anything in between
you will not be able to pick up where you left off.

If the line work is already created and want to create a line tangent to the
PC or PT you can draw a line from the point to the center of the arc. Or you
can use Grips with copy & rotate to rotate a copy of the tangent @ 90D.

You could always buy LDD/Civil 3D. Commands to accomplish this and many
other facets of road design are included.

HTH
Allen

"Darryl Collins" <dtcsurveys@valornet.com> wrote in message
news:420cdb86_2@newsprd01...

madcadd · Guest

ditto

kentium2000 · Guest

I believe the OP has only the one line, no circle, and the line is at some odd angle. The OP wants to have a line start at the end point of that line and have it be perp to it.

I have the ucs, object set as a quick key like UO, then it is easy enough to do what is being asked. Same method Dean suggested.

Dean Saadallah · Guest

Re-read the OP for the specific instance, not a blanket tangent discussion
on perp usage.

--
Dean Saadallah
Add-on products for LT
http://www.pendean.com/lt
--

Leon · Guest

"Dean Saadallah" <info from pendean> wrote in message
news:420cdcc7_1@newsprd01...

Randall Culp · Guest

I was speaking to your comment that PERP was NOT a FROM option, which it
clearly is. The OP wishes a double osnap, perp AND endp. I doubt that is
possible in any case.

"Dean Saadallah" <info here at pendean the company> wrote in message
news:420e2c72_2@newsprd01...

Dean Saadallah · Guest

OLD-CADaver · Guest

<<>>>I doubt that is possible in any case...<<<
Exactly my point, OP specific response ;) >>

That may have been your point, but your statement that "PERP is not a FROM selection", was in error. The OP is requesting a double osnap (perp AND endp), which is not available for ANY combination of osnaps.

Doug Broad · Guest

Darryl,
Use polar snap and set it relative to the last segment. Then go to town.
I think that will do what you want.

"Darryl Collins" <dtcsurveys@valornet.com> wrote in message news:420cdb86_2@newsprd01...

OLD-CADaver · Guest

<<Use polar snap and set it relative to the last segment. Then go to town. I think that will do what you want.>>

Doesn't that only work while you're drawing the lines? If the line already exists, it won't help, will it?

Doug Broad · Guest

Yes. That's right. It sounded like he was in the process of drawing lines.
The end+per snap could be done programattically but I don't see that it
would save much time. One would still have to decide which way perpendicular
and also know the length.

"OLD-CADaver" <nospam@address.withheld> wrote in message
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Dean Saadallah · Guest

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