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Re: drawing lines interactively [message #30528]

Sun, 05 May 2002 11:45

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Marten Blixt wrote:
>
> Hi all,
>
> I have a small problem which I've solved only partially.
>
> I would like to draw a line on an image using the mouse, by clicking on the
> two end points.
> Sofar I can do just that, by using
> TV,testimage,TRUE=1
> CURSOR, x0,y0,/DEVICE,/DOWN
> CURSOR,x1,y1,/DEVICE,/DOWN
> PLOT,[x0,x1],[y0,y1], /DATA,/NOERASE
>
> but then the line appears *after* the two endpoints have been choosen, and I
> would like a "temporary line", between the first point and the current position
> of the cursor, to be shown. This should help me in positioning the last point.
>
> There is probably a simple solution to this, I just haven't found it. Does any
> of you know how?
>
> Many thanks,
> Mï¿½rten Blixt

Dear Mï¿½rten

there are a lot of routines from Ray Sterner (JHUAPL) already available.
I am often using hori, veri, hor, ver, hline, vline and crossi.

http://fermi.jhuapl.edu/s1r/idl/s1rlib/local_idl.html

or the routine path:

ftp://fermi.jhuapl.edu/pub/idl/routines/

regards
Reimar

--
Reimar Bauer

Institut fuer Stratosphaerische Chemie (ICG-I)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
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[Message index]

		Re: drawing lines interactively By: R.Bauer on Sun, 05 May 2002 11:45
		Re: drawing lines interactively By: David Fanning on Fri, 03 May 2002 14:51
		Re: drawing lines interactively By: James Kuyper on Fri, 03 May 2002 09:05
		Re: drawing lines interactively By: nobody@nowhere.com (S on Fri, 03 May 2002 09:33

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