Re: New to GTK; some beginner questions.

[Russell Shaw <rjshaw iprimus com au>]

Amit BHATNAGAR wrote:
> Hi all.
>
> I am considering using GTK+ to develop an app for Solaris 8, and I 
> could use some help in answering some of my questions that would allow
> me to make a decision on whether or not to use GTK+. I have searched
> the FAQ & online docs, however if any of my questions have documented
> answers that I failed to find, please point me in the right direction.
>
> The app that I would be creating would largely deal with viewing radar
> images, and I would require to do some image manipulation, (zoom, pan, 
> filtering, contrast, brightness, display multiple images, edge detection,
> mirror, etc). I would like to use GTKmm (and Glademm) as C++ would be
> my primary development language of choice.
>
> #1 Does GTK provide an API that I can use to perform the above operations?

Gtk is more primitive compared to win32 GDI, but it mostly means there's
less things to get in your way. win32 GDI has real-world and screen
coordinate transformations for doing things like pan and zoom. I've
done the same thing in gtk by writing my own transform functions.

There's functions to render an array of pixels, so you can do all
your edge enhancements with the array before rendering it.

I haven't figured out how a pixmap can be got back into an array buffer.

Multiple images can be displayed just be opening multiple windows.

> Since GTK is closely connected with GIMP, is it possible to use GIMP to 
> achieve this? (assuming that GIMP has an API). I have read the documentation
> for GtkImage and even GdkPixmap, but nothing would suggest that image
> manipulation is possible from these. 
>
> #2 Is my only other alternative to use a library like ImageMagick to 
> perform these operations? Is there a GTK(mm) interface for this? I have
> found GDKMagick but this seems to be very old (obsolete?). There is also
> Magic++, but again I don't know how this integrates well within a GTK app.
> Is there any better alternative than ImageMagick?
>
> Thanks in advance for your assistance.
>
> amit.
>
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