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Re: A whine about default device settings [message #58639 is a reply to message #58636]

Sun, 10 February 2008 19:18

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article <MPG.221901b29e38c3ae9896b2@news.frii.com>,
David Fanning <news@dfanning.com> wrote:

> Kenneth P. Bowman writes:
>
>> Unfortunately, some of the default device settings are different between
>> the Z-buffer device and the X-Windows device. (I haven't checked the
>> WIN device because I don't have a Windows machine).
>
> Yes, this is a LONG standing problem. I think I first ran into this
> problem nearly 20 years ago. :-(
>
> Cheers,
>
> David

I ran into another similar issue later

IDL> help, !d, /str
** Structure !DEVICE, 17 tags, length=84, data length=84:
NAME STRING 'X'
X_PX_CM FLOAT 40.0000
Y_PX_CM FLOAT 40.0000

IDL> help, !d, /str
** Structure !DEVICE, 17 tags, length=84, data length=84:
NAME STRING 'Z'
X_PX_CM FLOAT 26.0000
Y_PX_CM FLOAT 26.0000

The pixels-per-centimeter parameters are read-only and cannot be set by
the user. Why that is the case for a virtual device that has no
physical size is beyond me.

This artificial difference in "resolution" means that you have to adjust
the SCALE factor on MAP_SET to make maps match when switching devices.
(I try to avoid using SCALE, but for some projections it is the best way
to make a map work right.)

Ken

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[Message index]

		Re: A whine about default device settings By: Bob[3] on Mon, 11 February 2008 08:59
		Re: A whine about default device settings By: Craig Markwardt on Mon, 11 February 2008 05:51
		Re: A whine about default device settings By: Kenneth P. Bowman on Sun, 10 February 2008 19:18
		Re: A whine about default device settings By: David Fanning on Sun, 10 February 2008 11:43
		Re: A whine about default device settings By: Kenneth P. Bowman on Mon, 11 February 2008 10:34

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