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Re: Map Function Question [message #79859 is a reply to message #79858]

Thu, 19 April 2012 06:58

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

alx writes:

> When ASPECT_RATIO is not specified, the IMAGE function scales the
> (nx,ny) image array with equal pixel sizes in x and y, in accordance
> with POSITION keyword (i.e. the overall scale is given by (pos[1]-
> pos[0])/nx > (pos[3]-pos[2])/ny). Your POSITION values are therefore
> satisfied in only one direction.
> When ASPECT_RATIO=0, the image function scales the array in both x and
> y direction, independently. But the image is distorted.
> All this makes sense, but is not really explained in EXELIS doc.

Well, let's leave aside the fact that the documentation
for the ASPECT_RATIO seems to be describing an alternative
Universe.

If setting ASPECT_RATIO=0 does what you say it does, I
would be *extremely* happy. I don't mind a distorted
image. That's what I'm trying for. I'm just saying,
the Image() function is distorting the image, but not
in any way that even vaguely resembles what I have asked
it to do!

I'm using the code from the other day. I'm just trying
to make a display that I can compare with the display
I created with Coyote Graphics. I can *easily* make
the Coyote Graphics display look like the function
graphics display (just set the Keep_Aspect keyword
on the image). But, it this case, I don't want to do
that. I want to fill up the goddamn window!

How hard can it be to make an image the proper size?
I've been doing nothing but that for 20 years! I would
be happy to supply Excels my cgImage code, if they
can't find it on the Internet on their own.

Sheesh! The main reason I can't work with Function Graphics
is that my blood pressure gets out of control. :-(

Cheers,

David

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

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[Message index]

		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 08:10
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 07:31
		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 07:16
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 07:16
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 07:14
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 06:58
		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 06:27
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 05:35
		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 02:34
		Re: Map Function Question By: David Fanning on Wed, 18 April 2012 09:20

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