GTK application scene drawing
Hi all, This may have been asked many times already but still if you people can provide some guidance it'd be really helpful. I am creating a 2D GTK application in which user can draw entities like point, line, circle, ellipse, etc. I have some experience working with QT. And in that I have QGraphicsView and QScenegraph using which I can add items to the scene. The items here would be those entities. Now I wish to have something like this so that it'd be easier for me to transit to GTK. I know about GtkDrawingArea which can be used to draw with Cairo library. But Cairo is still pretty limited as compared to Qt, with focus on the entities/items. I want that it'd be easier to work with these items in context of their selection, modification, etc. I heard about GooCanvas and Clutter. GooCanvas is not in active development since few years, so that is ruled out. Then comes Clutter which I tried to use but could not understand how each cairo drawing would be added as actors to the stage. If there is some solution available for my problem then please suggest so. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: GTK application scene drawing
On Sun, 2014-08-03 at 00:21 +0530, Gurjot Singh Bhatti 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. 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) 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. 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. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: GTK application scene drawing
On 3 August 2014 02:01, Stefan Salewski 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 ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
