| Resizeable Graphics Windows for Traditional Commands [message #74494] |
Tue, 18 January 2011 21:56  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
Some of you know I have been engaged the past several months
writing a book about traditional graphics commands. It will
be ready shortly. As I have written the book, I have been
putting ideas from the book into practice in a series of
programs I've started to call Coyote Graphics:
http://www.idlcoyote.com/graphics_tips/coyote_graphics.html
There was one program left to finish, and that was
a resizeable graphics window to display these routines.
I spent the past two days completely re-writing the old
FSC_Window program from scratch. The old program allowed
a single command to be added to a resizeable graphics
window.
The new program is significantly more powerful. In fact,
an unlimited number of graphics "commands" can be added
to the window, commands can be deleted and replaced by
other commands, listed, and so on. Plus, you can have
multiple windows on the display, and you can interact
with the commands in any one of the windows.
It is even possible to display multiple plots in
the graphics window with a mechanism that will remind
you strongly of !P.Multi.
Contents of the graphics window can be sent directly to
a PostScript file (you will have to write your own
routines to be PostScript compatible, but all the
Coyote Graphics routines are already set up for this),
or you can save the graphics window in any of five
different raster file formats. If you have ImageMagick
installed on your computer, you will have the additional
option of creating these raster files from PostScript
files, which dramatically improves the quality of the
raster output, especially fonts.
You can read more about FSC_Window in this article:
http://www.idlcoyote.com/graphics_tips/fsc_window.html
This is really a very easy way to create graphical output
in a resizeable graphics window in IDL. You will be able
to run this program in any version of IDL, as far as I
know.
I think we have about 2-3 weeks to play with this program
before the final code freeze for the book. Please let me
know if you have any comments.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Resizeable Graphics Windows for Traditional Commands [message #74558 is a reply to message #74494] |
Thu, 20 January 2011 07:56  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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David Fanning writes:
> Humm. The first "plot" command definitely works on my Windows
> machine. I'm not really doing anything with the commands
> except "executing" them with Call_Procedure. I can't think
> of a single reason why they wouldn't work everywhere.
>
> I guess I'll fire up the ol' LINUX machine and have
> a look. Strange. :-(
OK, here is the problem. For some reason on UNIX machines
the contents of the graphics buffer are not getting flushed
when you execute a graphics command with Call_Procedure.
I tried putting a FLUSH command at the end of the execution
and that didn't help. I tried an EMPTY, and that fixed the
problem. (I realized this was the problem, because if I
stepped through the code, everything worked perfectly!)
I believe I have seen this problem before. At least I
remember stepping through code and having things work,
but then NOT working when I just ran the program. I
probably should make a note of this. This is probably
not the last time we will run into it.
I'll have a new version up in about a half hour. If you
want to fix it yourself, put the EMPTY command at the
end of the FSC_WINDOW_COMMAND::DRAW method.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Resizeable Graphics window [message #75110 is a reply to message #74494] |
Thu, 17 February 2011 12:03 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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wlandsman writes:
> Thanks! That works but /LOADCMD (unlike ADDCMD) is not directly available in CGPLOT. So if I want to write a program with optional output to a resizeable window it would look like this:
>
> pro myplot,window= window
> ;/WINDOW - if set, then display in a resizeable graphics window
>
> cgplot,indgen(100),window = window,psym=2
> if keyword_set(window) then begin
> for i=0,89 do cgwindow,'cgplots',[i,i],[i-2,i+2],/loadcmd
> cgwindow,/execute
> endif else for i=0,89 cgplots,[i,i],[i-2,i+2]
>
>
> return
> end
Yes, that's another way to do it. I balked at
adding yet another keyword (LOADCMD) to each of the
Coyote Graphics routines, because I could see there
could easily be no end to it, and it was already
getting cumbersome. My goal in writing these routines
is simplicity, above all.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Resizeable Graphics window [message #75111 is a reply to message #74494] |
Thu, 17 February 2011 11:57 |
wlandsman
Messages: 743
Registered: June 2000
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Senior Member |
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On Thursday, February 17, 2011 2:44:06 PM UTC-5, Jeremy Bailin wrote:
> You could try doing /loadcmd instead of /addcmd, and then after the for loop execute them with
>
> cgwindow, /executecmd
>
Thanks! That works but /LOADCMD (unlike ADDCMD) is not directly available in CGPLOT. So if I want to write a program with optional output to a resizeable window it would look like this:
pro myplot,window= window
;/WINDOW - if set, then display in a resizeable graphics window
cgplot,indgen(100),window = window,psym=2
if keyword_set(window) then begin
for i=0,89 do cgwindow,'cgplots',[i,i],[i-2,i+2],/loadcmd
cgwindow,/execute
endif else for i=0,89 cgplots,[i,i],[i-2,i+2]
return
end
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| Re: Resizeable Graphics window [message #75113 is a reply to message #74494] |
Thu, 17 February 2011 11:47 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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wlandsman writes:
> I am unclear how to add graphics commands to a Coyote graphics window. If I create a simple plot in a resizeable window:
>
> cgplot,indgen(100),/window,psym=2
>
> and now I want to add error bars.
>
> for i=0,89 do cgplots,[i,i],[i-1,i+1],/addcmd
>
> I get the plot I want but only after 90 flashes of the window. (If I don't include the /addcmd keyword then the error bars go to a different window.)
I would turn "execution" of the commands off until
you were finished loading the commands:
cgplot,indgen(100),/window,psym=2
cgControl, EXECUTE=0
for i=0,89 do cgplots,[i,i],[i-1,i+1],/addcmd
cgControl, EXECUTE=1
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Resizeable Graphics window [message #75205 is a reply to message #75113] |
Thu, 17 February 2011 12:24 |
Jeremy Bailin
Messages: 618
Registered: April 2008
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Senior Member |
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> I would turn "execution" of the commands off until
> you were finished loading the commands:
>
> cgplot,indgen(100),/window,psym=2
> cgControl, EXECUTE=0
> for i=0,89 do cgplots,[i,i],[i-1,i+1],/addcmd
> cgControl, EXECUTE=1
Ah yes, that's clearly a better option. :-)= Lots of nice little tricks within CG still to learn...
Speaking of which, I've got another odd issue with the aspect ratio of output. If I output a postscript file, I get the wrong aspect ratio, but if I out a .png file via ImageMagick, I get the right aspect ratio. Even weirder is that if I set ps_delete=0, the intermediate postscript file has the *right* aspect ratio. I've looked at the code in both sections, and I can't see any difference that could account for it... and if I try to manually run the commands that create the ImageMagicked .png file, I get the wrong aspect ratio!
So I'm befuddled. :-)=
{ x86_64 darwin unix Mac OS X 7.0.4 Sep 3 2008 64 64}
-Jeremy.
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