discuss.visual-prolog.com

[Chan Bok]

I recently launched a beta version of Axon Idea Processor (Axon2010) that uses GDI+ for 2D and OpenGL for 3D display (switcheable).

Many thanks to Gildas for pioneering OpenGL in VIP and sharing his knowhow by publishing the V3D package. Unlike V3D, the Axon version uses only opengl.lib and glu32.lib, but does not use vip7opengl.lib, glaux.lib, or c glue-codes.

OpenGL has many of the graphics features of GDI+, but is lacking in font support and hatch patterns. Performance is highly satisfactory due to the use of the graphics processor, frame buffers, and threading.

The software is still in the beta stage, and beta testers are most welcome.

Chan Bok
Axon Research
http://web.singnet.com.sg/~axon2000

[Chan Bok]

Axon2010 is now post beta.
The Lite version is, as usual, freely available for download.

Chan Bok
Axon Research

[Eki]

[Chan Bok]

Dear Erkki,

Firstly a belated congratulations to your PhD, and to your excellent work and blog,
and also your book that you showed me while in St. Petersberg.
I must admit I am overwhelmed by what I see.

As you can see I have experimented with both 2D and 3D.
I am not sure if you are referring to 2D or 3D, or both.

For 2D display I still use the GDI+ flat API on a conventional window for historical reason.
For a new project I will certainly consider the OO version.

For 3D much can be learned about OpenGL programming by studying Gildas' V3D package.

For a complex display with animation, performance become an issue.
For 2D, double-buffering is needed for smooth display.
3D has the advantage of hardware acceleration and buffer swapping.

Best Regards,

Chan Bok
Axon Research

[Eki]

[Chan Bok]

I don't have any examples other than the complete source codes (for Axon).
There are some examples in the Examples (that come with Visual Prolog) for drawing including a gdiplus demo.

Best Regards,

Chan Bok
Axon Research

[jgbest]

Chan,

I've used Axon and it's an amazing program that came to me naturally because I can create models that are designed after the way I think. I'm writing a program right now in Visual Prolog using OpenGL. I noticed how you have it where users can click on objects and move them around. I'm trying to do something similar in my own program and was wondering what OpenGL Library you used? I'm using the one from the example :

http://www.visual-prolog.com/vip/example/userExample/openGL/OpenGL.htm

And it works nicely, although, I'm having trouble finding the GL_SELECT render modes, and even more importantly, the get pixel color method(s). I'm using the unique-color-for-each-object method and I need to be able to get the pixel colors. How were you able to get the selection of your objects working? Did you use a different library, did you write your own algorithm? Any help you could provide would be awesome.

Thank you!
James

[Gildas Menier]

Hi James,

This may help you (see the end of the page for a (temp) download link) : http://www.arsaniit.com/en/prolog-tools/menu-extension/opengl-v3d

The code should provide more or less what you need (the selection is also implemented using a single pass one-color draw when the user clicks with an off line buffer - I guess you see what I mean)

I am completely rewriting this package from scratch so this link won't be available too long. Feel free to pm to arsaniit if you have questions.

Best regards

Gildas

[jgbest]

Glidas,

Thank you so much for your help. That source code has exactly what I'm looking for.

Thanks again!
James

[jgbest]

Glidas,

One more thing: I'm having trouble compiling my code with yours. I only added everything in v3d to my project, but I'm getting this fatal error:

t process.
fatal error lnk2561: Fatal error 2561: Obj\opengl_bind.obj(Obj\opengl_bind.obj), file offset: 0000071E - Can't process.

Any idea what that means?

Thanks,
James