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Re: Change default value of system variable? [message #23841 is a reply to message #23840]

Fri, 23 February 2001 09:11

davidf
Messages: 2866
Registered: September 1996

Senior Member

K. Bowman (k-bowman@null.tamu.edu) writes:

> I prefer to plot with black lines on a white background, so in my
> idl_startup file I include
>
> !P.BACKGROUND = COLOR_24('white') ;Set background color to white
> !P.COLOR = COLOR_24('black') ;Set default draw color to black
>
> (COLOR_24 is my own routine.)
>
> This works fine until I change plot devices and then change back, viz.
>
> flow>idl
> IDL Version 5.3 (IRIX mipseb). (c) 1999, Research Systems, Inc.
> IDL> PRINT, !P.BACKGROUND, !P.COLOR
> 16777215 0
> IDL> SET_PLOT, 'PS'
> IDL> SET_PLOT, 'X'
> IDL> PRINT, !P.BACKGROUND, !P.COLOR
> 0 255
>
> This means that I have to include code to set !P.BACKGROUND and
> !P.COLOR in every time I switch graphics devices. Is there any way to
> change the default value of a built-in system variable?

Uh, use somebody else's routine:

!P.Background = FSC_Color("white", !P.Background)
!P.Color = FSC_Color("black", !P.Color)

That will work correctly *everywhere*. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Change default value of system variable? By: Kenneth P. Bowman on Fri, 23 February 2001 16:43
		Re: Change default value of system variable? By: Paul van Delst on Fri, 23 February 2001 11:56
		Re: Change default value of system variable? By: Craig Markwardt on Fri, 23 February 2001 11:14
		Re: Change default value of system variable? By: Martin Schultz on Fri, 23 February 2001 10:00
		Re: Change default value of system variable? By: davidf on Fri, 23 February 2001 09:21
		Re: Change default value of system variable? By: davidf on Fri, 23 February 2001 09:11
		Re: Change default value of system variable? By: Liam E. Gumley on Mon, 26 February 2001 07:45
		Re: Change default value of system variable? By: davidf on Fri, 23 February 2001 18:43

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