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Re: A whine about default device settings [message #58640 is a reply to message #58639]

Sun, 10 February 2008 11:43

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

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).
>
> IDL> window, xsize=1024, ysize=768
> IDL> help, !d, /str
> ** Structure !DEVICE, 17 tags, length=84, data length=84:
> NAME STRING 'X'
> X_CH_SIZE LONG 6
> Y_CH_SIZE LONG 10
> IDL> set_plot, 'z'
> IDL> device, set_resolution = [1024, 768], set_pixel_depth = 24
> IDL> help, !d, /str
> ** Structure !DEVICE, 17 tags, length=84, data length=84:
> NAME STRING 'Z'
> X_CH_SIZE LONG 8
> Y_CH_SIZE LONG 12
>
> Because IDL scales margins and plot sizes based on the character size,
> switching devices means that the resulting graphs are not identical,
> despite identical window/device sizes.
>
> This can be rectified by setting the character size of the Z-buffer
> device with
>
> DEVICE, SET_CHARACTER_SIZE = [6, 10]
>
> or doing the reverse for the X-Windows device, but this seems to me to
> be a pointless and unnecessary device dependence.
>
> I am annoyed enough to post about this because I just spend longer than
> I should have figuring out why the graphics output from the two devices
> was not identical.

Yes, this is a LONG standing problem. I think I first ran into this
problem nearly 20 years ago. :-(

Cheers,

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

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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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