Re: GTK application scene drawing

[Gurjot Singh Bhatti <bhattigurjot gmail com>]

On 3 August 2014 02:01, Stefan Salewski <mail ssalewski de> wrote:
> > This may have been asked many times already
>
> Yes, in the last years a have found a few similar questions with google,
> in most cases not with VERY helpful replies.

Exactly.

> I myself have used cairo with a GTK drawing area for my schematics tool,
> and it was not a bad choice for that task: It gives me all the freedom I
> need for that application, it looks fine and is fast enough -- I am not
> sure if Ruby or cairo is currently more the limiting factor, I guess
> both. (I am using bounding boxes for my objects and redraw only when
> content has changed. http://www.ssalewski.de/PetEd.html.en)

Your project looks nice. Is it open-source?
I have something similar in my mind in context to that Grid and
drawing entities.
But so far I am just able to draw points on my drawingArea and and now
working on how to detect if there is already a point under mouse. This
is because I want to draw line when 2 points are already drawn and I
select them.

> I think your general conclusion is right, but you do not report about a
> few important aspects: First, when you have already experience with Qt,
> why do you not use QGraphicsView? I heard it is fine -- for C++ it may
> be a good choice, for other languages you have to check if bindings are
> available -- I think not for Rust or Ninrod, for Julia, Haskell I am not
> sure.

Actually I am working on a GSoC project and Gtk is a requirement.

> One important aspect may be drawing performance. Cairo in not very fast
> by default, I think OpenGl and multi-treading support is limited, at
> least I found no nice examples for really fast drawing. And generally
> OpenGl for GTK is not very well supported -- GTKGLEXT may work with
> GTK3, but I am not sure and there is not much recent activity.

I guess since my application won't be so heavy, drawing performance
might not be an issue. But I am still figuring out how to do something
like Scene and its items.


-- 
Gurjot Singh Bhatti
Blog: http://bhattigurjot.wordpress.com

"It takes a person who is wide awake to make his dream come true." ~
Roger Babson