| Direct or object graphics [message #17099] |
Sun, 12 September 1999 00:00  |
Lazzar
Messages: 9
Registered: February 1999
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Junior Member |
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I'm in the process of creating a program to display an array of data as
an image. I would like it to work in much the same way as a paint
program like Photoshop. When the user selects the file to open, the
image will be scaled inside of a window. As the user resizes the window
the image will stay the same size, but centered in the window with some
sort of fill around it to differentiate it from the background space.
The user will also have the option to zoom in and out on the image
causing it to fill more of the window or less of the window. My
question is, would it be better to do this in direct or object graphics
mode? The image will not be 3D. I am looking to optimize speed and
also allow the user to have as much control over the image as possible
(things like drawing and extracting a region of interest). This whole
application will be contained inside of a Visual Basic framework using
ActiveX to communicate back and forth.
Any help that can be provided will be greatly appreciated...
Brian
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| Re: Direct or object graphics [message #17159 is a reply to message #17099] |
Wed, 15 September 1999 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Ben Tupper (tupper@seadas.bigelow.org) writes:
>> If it were me, I'd do it in direct graphics. The only
>> things that really seems to scream "object graphics" to
>> me are those things that require a 3D representation.
>
> I have been stewing over a similar object/direct graphics problem. I often
> need enable data picking from a 2d or 3d scatter plot. In the past I have
> accomplished 2d data picking in direct graphics; what a BEAR to wrestle
> with. It seems like OOG makes data picking easy. Should data picking be
> added to the things that 'scream'?
Yes, I think so. The only way to do 3D data picking
in direct graphics is to have a copy of the window
around in the Z-graphics buffer, where you *can* get
3D location information. As you say, it is a bear
to get it to work properly.
Since the object graphics system *is* a Z-graphics
buffer almost by definition, 3D data picking just
sort of falls out of it. Very easy.
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: Direct or object graphics [message #17161 is a reply to message #17099] |
Wed, 15 September 1999 00:00 |
Ben Tupper
Messages: 186
Registered: August 1999
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Senior Member |
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
David Fanning wrote:
<blockquote TYPE=CITE>
<br>If it were me, I'd do it in direct graphics. The only
<br>things that really seems to scream "object graphics" to
<br>me are those things that require a 3D representation.
<br>
<br> </blockquote>
I have been stewing over a similar object/direct graphics problem.
I often need enable data picking from a 2d or 3d scatter plot. In
the past I have accomplished 2d data picking in direct graphics; what a
BEAR to wrestle with. It seems like OOG makes data picking
easy. Should data picking be added to the things that 'scream'?
<pre>--
Ben Tupper
Bigelow Laboratory for Ocean Science
tupper@seadas.bigelow.org
Pemaquid River Company
pemaquidriver@tidewater.net</pre>
</html>
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