Comments for Zchydem's Blog

Comment on Playing with Qt Scene Graph by zchydem

zchydem — Sat, 07 Jan 2012 18:23:32 +0000

@sq QGraphicsView was originally designed to handle at least thousands of items (not sure about millions), but because of Qt legacy, QPainter based drawing didn’t handle painting as optimized as it should have done that. With QtQuick 2.0 and Qt 5 the new scene graph handles drawing more optimized. I.e. it’s much faster as QtQuick 1.0.

I haven’t got time to follow what’s happening in Qt5 in depth lately, but if you are interested in about details, you should check the source code and the documentation: http://doc.qt.nokia.com/5.0-snapshot/qtquick.html

All the classes starting with “QSG” are scene graph classes.

Comment on Playing with Qt Scene Graph by sq

sq — Sat, 07 Jan 2012 17:40:33 +0000

QGraphicsView is designed to work perfectly well with huge scenes, i.e. millions of items.
Is this also true for QtQuick 1 (since it’s build on top of QGraphicsView)?

And how will that be with QtQuick 2?
In other words, will the new Scene Graph e.g. allow for techniques like spatial partitioning?

Comment on Tip of the day – Make Qt Creator to compile QML files to resource file on every build by zchydem

zchydem — Thu, 24 Nov 2011 18:28:33 +0000

I haven’t experienced this problem for a while now, so make sure you use the latest Qt Creator -version.

Comment on Tip of the day – Make Qt Creator to compile QML files to resource file on every build by ducvd

ducvd — Tue, 22 Nov 2011 08:59:15 +0000

I followed your instruction. But it seems the QT compiler does not re-compile the changed QML files.

Even if I manually run command “touch home.png” (home.png is a image file in resource (.qrc file)), nothing happens.

Comment on Qt-HowTo: Private Classes and D-Pointers by zchydem

zchydem — Thu, 20 Oct 2011 13:03:19 +0000

@cymurs Thank you for reading my blog!

Comment on Qt-HowTo: Private Classes and D-Pointers by cymurs

cymurs — Thu, 20 Oct 2011 07:50:32 +0000

Thanks for writing!
I gain better knowledges.

Comment on Tip of the day – Make Qt Creator to compile QML files to resource file on every build by zchydem

zchydem — Fri, 05 Aug 2011 09:14:38 +0000

@dubik Thanks for the comment!

The problem is not adding the QML file to resource and it doesn’t get compiled in. The problem is that if I modify any of the existing QML files in my project (they already were added to resource file and compiled earlier) the modified files won’t get compiled into a binary.

I also want to mention that this problem doesn’t happen every time. Sometimes I have worked on my project for 2 hours and all the suddenly it quits compiling my changes. Usually this doesn’t happen for all the files i.e. modifications in a one file get compiled and modifications in other file won’t get compiled in.

I haven’t tried to run qmake, but as you proposed, I believe it works too.

Comment on Tip of the day – Make Qt Creator to compile QML files to resource file on every build by dubik

dubik — Fri, 05 Aug 2011 05:59:50 +0000

Every time you add qml file just execute “run qmake” and it will recompile everything properly.

Comment on Using QML with 3D and OpenGL by zchydem

zchydem — Fri, 29 Jul 2011 11:35:31 +0000

@drinkmilk I’m sorry, but I lost the code accidentally, but it was only based on few hours of work. Friend of mine worked pretty much similar concept and he used the same approach than I was using. You might want to check out his work from his blog:

http://www.johanpaul.com/blog/2011/05/request-for-comments-qt3d-subnode-texture-interaction/

There is also a link to source code. Actually he has managed to implement it little bit further and now it works perfectly. I’m not sure if he’s allowed to share the latest code too, but you could ask him directly.

Comment on Using QML with 3D and OpenGL by drinkmilk

drinkmilk — Fri, 29 Jul 2011 09:30:53 +0000

Hey,

I am working on something similar and thus I find this project very interesting. Do you mind sharing the code? I am mainly interested in the architecture, so it’s totally fine by me if it’s in alpha stage.

Thanks!