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Re: Altered device coordinates after first call [message #50838 is a reply to message #50837]

Mon, 16 October 2006 09:36

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Juan Arrieta writes:

> Please have a look at my code, the data is of course fictitious, but
> the general idea is to produce a nice looking letter-size output. If
> you want to see the PS, uncomment the corresponding lines. The code as
> it is will produce a direct graphics plot.

Humm. Well, there is a LOT going wrong in this code. :-)

The main thing is that you are drawing graphics in DATA
coordinates, but you haven't established a DATA coordinate
system in the code. So it's using the *last* one that did
get established, which could be anything at all. That's
why you can't reproduce anything.

It looks to me like you want to draw graphics in a NORMAL
(normalized) coordinate system. If so, you will need to set
a NORMAL keyword on all your PLOTS and XYOUTS commands.

I would also draw the plots *first*, then put all the
annotation on the plots. It is the NOERASE keyword on
your PLOT commands that I think is really screwing you
up here. I see why you want to do it, since all your
annotation disappears when the first plot is drawn, but
it plays absolute havoc with your data coordinate system.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Altered device coordinates after first call By: David Fanning on Mon, 16 October 2006 12:25
		Re: Altered device coordinates after first call By: Juan Arrieta on Mon, 16 October 2006 12:10
		Re: Altered device coordinates after first call By: David Fanning on Mon, 16 October 2006 09:48
		Re: Altered device coordinates after first call By: David Fanning on Mon, 16 October 2006 09:41
		Re: Altered device coordinates after first call By: David Fanning on Mon, 16 October 2006 09:36
		Re: Altered device coordinates after first call By: David Fanning on Mon, 16 October 2006 09:24

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