| Re: oplot in normal coordinates? [message #16232] |
Tue, 13 July 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Martin LUETHI (luthi@aura.ethz.ch) writes:
> Thank you for your answers! It is just confusing that the manual lists the
> /normal keyword for oplot, if it won't make any effect.
Oh, well. Keep in mind we are talking about computer software
documentation here. If there is one thing I've learned
over the years, it is that *anything* is likely to happen
when you start fooling around with software. You're lucky
if it even resembles the documentation. :-)
> How would you guess from this that this feature is not implemented?
I can't even guess how my programs *work* three
weeks after I write them!
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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| Re: oplot in normal coordinates? [message #16234 is a reply to message #16232] |
Tue, 13 July 1999 00:00  |
luthi
Messages: 20
Registered: March 1999
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Junior Member |
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Thank you for your answers! It is just confusing that the manual lists the
/normal keyword for oplot, if it won't make any effect.
For illustration an excerpt from the online reference:
------
Normal Keyword
Indicates that the coordinates are in the normalized coordinate system and
range from 0.0 to 1.0.
When used with AXIS, CONTOUR, OPLOT, PLOT, SHADE_SURF, and SURFACE, indicates
that the Clip and/or Position coordinates are in the normalized coordinate
system and range from 0.0 to 1.0.
------
How would you guess from this that this feature is not implemented? By the
way: at least in PV-Wave the PLOT command understands the /normal keyword in
conjunction with the position keyword, which is the only way to make good
multiple plots (!p.multi is not flexible enough), especially a small plot (an
overview map) inside of a larger (data) plot.
Cheers
Martin
--
============================================================
Martin Luethi Tel. +41 1 632 40 92
Glaciology Section Fax. +41 1 632 11 92
VAW ETH Zuerich
CH-8092 Zuerich mail luthi@vaw.baum.ethz.ch
Switzerland
============================================================
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| Re: oplot in normal coordinates? [message #16235 is a reply to message #16232] |
Tue, 13 July 1999 00:00 |
Harald Frey
Messages: 41
Registered: March 1997
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Member |
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"Martin LUETHI GL A8.1 2-4092" wrote:
> Hello
>
> Just another problem with plotting: is it possible to oplot in normal
> coordinates?
>
> plot, [0],[0],xrange=[-1,1],yrange=[-1,1]
> oplot,[0.5],[0.5],psym=2,/normal
>
> plots the symbol at (0.5,0.5) in data coordinates instead of somewhere around
> (0,0), which would be the appropriate place in normal coordinates. Am I
> overlooking something?
>
> (btw.: PV-Wave 6.1, Solaris 2.6)
>
try this
plots,[0.5],[0.5],psym=2,/normal
Harald
hfrey@ssl.berkeley.edu
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| Re: oplot in normal coordinates? [message #16236 is a reply to message #16232] |
Tue, 13 July 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Martin LUETHI GL A8.1 2-4092 (luthi@aura.ethz.ch) writes:
> Just another problem with plotting: is it possible to oplot in normal
> coordinates?
No.
> plot, [0],[0],xrange=[-1,1],yrange=[-1,1]
> oplot,[0.5],[0.5],psym=2,/normal
>
> plots the symbol at (0.5,0.5) in data coordinates instead of somewhere around
> (0,0), which would be the appropriate place in normal coordinates. Am I
> overlooking something?
In IDL, at least, the OPLOT command doesn't allow the use
of the NORMAL keyword. But even if it did, it would probably
just ignore it in exactly the same way the PLOT command
ignores it. In other words, these three commands produce
identical results.
PLOT, Findgen(11), /Data
PLOT, Findgen(11), /Normal
PLOT, Findgen(11), /Device
But what else would you expect? A plot is a plot.
It sets up scaling factors that tell you how to
display something in the display window. It is
these scaling factors (e.g., !X.S) that OPLOT pays
attention to.
If you really want to put a plot symbol in the middle
of the display, I would use the PLOTS command:
PlotS, 0.5, 0.5, PSym=2, /Normal
PLOTS ignores PLOT system variables and does exactly
what you tell it to, in whatever coordinate system you
choose to use.
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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