| Re: Virtues of normalized coordinates [message #16962] |
Thu, 26 August 1999 00:00 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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davidf@dfanning.com (David Fanning) writes:
> Andy Loughe (afl@cdc.noaa.gov) writes:
>
>> I really don't understand this sentiment. Data coordinates have always
>> worked well for me when placing text, colorbars, etc. around a plot that
>> needs such enhancements. If these things need to "hug" the plot, why
>> use normalized coordinates?
Another good reason for normalized coordinates is when you want to lay
an image onto an existing plot window. If you use
PLOT, ... POSITION=...
to start with then you can place the image easily using David's
TVIMAGE program. Otherwise, getting a match-up is truly hellish.
Criag
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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| Re: Virtues of normalized coordinates [message #16966 is a reply to message #16962] |
Thu, 26 August 1999 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Andy Loughe (afl@cdc.noaa.gov) claims he is confused by
my simple, declarative sentence:
>> Uh, normalized coordinates. All the time. Every time. Every where. :-)
Actually, I was confused for a moment, too, about whether it
should be "Everytime" and "Everywhere". I finally decided to
write it the way I did, so that the "every" would come out
loud and clear. :-)
He elaborates:
> I really don't understand this sentiment. Data coordinates have always
> worked well for me when placing text, colorbars, etc. around a plot that
> needs such enhancements. If these things need to "hug" the plot, why
> use normalized coordinates?
Data coordinates are not a bad fall-back if you
are working with, say, a single plot in the display
window. But when you are trying to do more
complicated things, they get harder to keep
track of. (Let's see, if I want to write some
text in this place over here between two plots,
is that the data coordinate space of the first
plot, or the second? Humm.) Normalized coordinates
is normalized coordinates. Every where. Every time.
And once you learn "0 to 1" there isn't much more
you need to know about the concept. :-)
> I have also been a proponent of !p.multi
> with careful attention to margin settings... this may also make me a
> heretic to some developers. Someone please teach me why I should not
> disdain the use of "convert_coord" and "position=[*,*,*,*]"!
Uh, aren't those POSITION values in normalized coordinates?
Wonder why that is. :-)
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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