drawing parallel and perpendicular line to a straight line

[Pierre Ciparisse]

Hello,

I'm new to the list.
I'm looking for solution in analysing digital X-ray images of head profile (orthodontic calculations).
With ImageJ, i'm able to select points and calculate distance and angle. It works well.
But I also need to construct points from parallel and perpendicular lines.

My question is, how can I draw a 'straight line' parallel to an other, and how can I draw a perpendicular line to an other straight line?

(It's very easy with a ruler and a 'set squarre' on a Rx-slide and a light box but... I would prefer to work based on digital picture)

Any suggestion?

Thanks in advance.

CIP

[Volker Baecker]

Hello Pierre,
if you use straight line selection, you can grab the selection in the
middle and move it around to measure another line-segment that is
parallel to the first one. You can use Edit>Selection>Rotate to rotate
the straight line selection by 90 or -90 degrees to get a perpendicular
line segment.
Volker

Pierre Ciparisse a écrit :

> Hello,
>
> I'm new to the list.
> I'm looking for solution in analysing digital X-ray images of head profile (orthodontic calculations).
> With ImageJ, i'm able to select points and calculate distance and angle. It works well.
> But I also need to construct points from parallel and perpendicular lines.
>
> My question is, how can I draw a 'straight line' parallel to an other, and how can I draw a perpendicular line to an other straight line?
>
> (It's very easy with a ruler and a 'set squarre' on a Rx-slide and a light box but... I would prefer to work based on digital picture)
>
> Any suggestion?
>
> Thanks in advance.
>
> CIP
>

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