| Re: Quickly Erasing lines on direct graphics images [message #46249] |
Mon, 14 November 2005 05:11 |
Richard French
Messages: 173
Registered: December 2000
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Senior Member |
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On 11/14/05 12:19 AM, in article MPG.1de1cc535af6334a9896ac@news.frii.com,
"David Fanning" <david@dfanning.com> wrote:
>
> OK, I haven't *tested* this one on a Macintosh, but
> I think it has a better chance of working than the
> last one I put over there. :-)
Yup, works on a Mac, and ->map does the job, too. Many thanks!
Dick
One small typo: error message for CopytoPixmap is misnamed:
PRO PIXMAP::CopytoPixmap, windex
IF N_Elements(windex) EQ 0 THEN windex = !D.Window
IF windex LT 0 THEN BEGIN
void = Dialog_Message('PIXMAP::COPYtoWINDOW: No graphics window
available to copy to pixmap.')
ENDIF
self -> SetWindow
Device, Copy=[0, 0, !D.X_Size, !D.Y_Size, 0, 0, windex]
END ; ------------------------------------------------------------ ------
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| Re: Quickly Erasing lines on direct graphics images [message #46255 is a reply to message #46249] |
Sun, 13 November 2005 21:19  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Richard G. French writes:
> David - I tried this, and nothing showed up in window 3 (which I had already
> created, using
> Window,3,xsize=300,ysize=400
>>
>> pixmap -> SetWindow
>> Plot, findgen(11) ; etc.
>>
>> To copy to a window, say window index number 3:
>>
>> pixmap -> CopyToWindow, 3
Wait! Macintosh, right!
Here is one thing I *have* learned in the past couple
of weeks. If you are going to write programs that run
on a Macintosh, you darn well better learn what RETAIN=2
means! In fact, if I were a Mac user, you can bet I would
have this command in my IDL startup file:
DEVICE, RETAIN=2
Otherwise, not much good software is going to run on that
damn machine.
That said, I, uh, put the wrong number on the RETAIN
keyword. Sorry. :-(
> In the version on the ftp site, I get:
> IDL> pixmap->map,1
> % Attempt to call undefined method: 'PIXMAP::MAP'.
> % Execution halted at: $MAIN$
> IDL>
>>
> Is there a newer version out there somewhere?
Sigh... Computers are a mystery to me, as they are
to most of my students. "Do you mean I have to *save*
the file before I transfer it over there via FTP!?"
OK, I haven't *tested* this one on a Macintosh, but
I think it has a better chance of working than the
last one I put over there. :-)
ftp://ftp.dfanning.com/pub/dfanning/outgoing/misc/pixmap__de fine.pro
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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| Re: Quickly Erasing lines on direct graphics images [message #46263 is a reply to message #46255] |
Sun, 13 November 2005 17:48 |
Richard French
Messages: 173
Registered: December 2000
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Senior Member |
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David - I tried this, and nothing showed up in window 3 (which I had already
created, using
Window,3,xsize=300,ysize=400
>
> pixmap -> SetWindow
> Plot, findgen(11) ; etc.
>
> To copy to a window, say window index number 3:
>
> pixmap -> CopyToWindow, 3
>
> If you wish to make the pixmap a different size (for
> example, in a resizeable graphics window application):
>
> pixmap -> Resize, newXsize, newYsize
>
> But, best of all, if you want to see what you actually
> have in the pixmap (i.e., so you can debug your program):
>
> pixmap -> Map, 1
>
> To hide it again:
>
> pixmap -> Map, 0
In the version on the ftp site, I get:
IDL> pixmap->map,1
% Attempt to call undefined method: 'PIXMAP::MAP'.
% Execution halted at: $MAIN$
IDL>
>
Is there a newer version out there somewhere?
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| Re: Quickly Erasing lines on direct graphics images [message #46265 is a reply to message #46264] |
Sat, 12 November 2005 14:22 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
> Richard G. French writes:
>
>> I have a Direct Graphics question. How can I quickly erase lines that I have
>> drawn in displayed images?
>
> The standard way to do this kind of "quick erasing" is
> to use a pixmap and the "Device Copy" technique.
Participants in my class this week wrote a pixmap object
that proved extremely useful. I've made it available here:
ftp://ftp.dfanning.com/pub/dfanning/outgoing/misc/pixmap__de fine.pro
To create a pixmap with an X size of 300 and a Y size
of 400 pixels, you do this:
pixmap = Obj_New('pixmap', XSize=300, YSize=400)
Given that you have something in IDL graphics window
2 that you want to copy to a pixmap, you would do this:
pixmap -> CopyToPixmap, 2
Or, you can simply draw graphics in the pixmap:
pixmap -> SetWindow
Plot, findgen(11) ; etc.
To copy to a window, say window index number 3:
pixmap -> CopyToWindow, 3
If you wish to make the pixmap a different size (for
example, in a resizeable graphics window application):
pixmap -> Resize, newXsize, newYsize
But, best of all, if you want to see what you actually
have in the pixmap (i.e., so you can debug your program):
pixmap -> Map, 1
To hide it again:
pixmap -> Map, 0
Be sure to destroy it when you are done. If it is
mapped, you can destroy it with your mouse. If not,
you must do it like this:
Obj_Destroy, pixmap
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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