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June 26,2002 [email protected], Moscow
Cross-Platform Qt-Based Implementation of Low Level
GUI Layer of ROOT
V.Fine
BNL, Upton
June 26,2002 [email protected], Moscow
Why ROOT is multi-platform ?
•Just to be healthy !•Just because there are plenty of Windows users around
June 26,2002 [email protected], Moscow
ROOT for different platformshttp://root.cern.ch/root/images/ftpstats.gif
June 26,2002 [email protected], Moscow
ROOT low level GUI interface
TVirtualX
TGX11TGWIN32 TGWin32GDK
ROOT(TG<family
>
ROOT(TVirtualPad)
3 different implementations to develop and support
June 26,2002 [email protected], Moscow
ROOT Qt-based GUI interface
TVirtualX
TQt
ROOTROOT
only one (!) implementation
June 26,2002 [email protected], Moscow
Why Qt ?It does what it promises !
Myself have been confused no time with Qt documentation and functionality
But it is not my (ROOT user) business to make the ROOT team life more easy.
The plain implementation of TVirtualX that doesn’t bring any new feature can not justify
the efforts to introduce a new extra layer and external dependency of the ROOT
package
June 26,2002 [email protected], Moscow
(ROOT + Qt) based applications
The question is:
“How easy can one create a complex application that uses ROOT to do what only ROOT can provide (namely the features coming from the built-in C++ interpreter) and use Qt to create cross-platform GUI ? ”
June 26,2002 [email protected], Moscow
libQtgui library
Qt-based ROOT consists of a standard ROOT installation with the addition of two additional shared libraries
The libQtGui library contains implementations of abstract interfaces provided by the TGuiFactory ROOT class:
• TCanvasImp
•TBrowserImp
•TContextMenuImp
•TControlBarImp
•TInspectorImp
1 day to implement !2 days to implement0.5 day to implement
June 26,2002 [email protected], Moscow
Qt-ROOT CVS
The source code is available via CVS repository as well.To check out the sources, you need to be running CVS 1.10 or
later (check by doing cvs -v), and have your $CVSROOT set to
:pserver:[email protected]:/rootbnl/cvs
The password for user cvs is cvs.
Two cvs commands will do the job:
•cvs -d :pserver:[email protected]:/rootbnl/cvs login
•cvs -d :pserver:[email protected]:/rootbnl/cvs co root
AFS access will be provided also.
June 26,2002 [email protected], Moscow
ConclusionThere are enough evidences the present approach allows the ROOT developers as well as ROOT users to work with code that has no X11/WIN32 graphics subsystem dependencies and at the same time opens unrestricted access to a rich set of ready-to-use commercial and free GUI Qt-based widgets. The Qt-based version was tested on Unix and Windows.
June 26,2002 [email protected], Moscow
Thank you
Special thanks:
1. Torre Wenaus, Yuri Fisyak, Victor Perevoztchikov
2. Anton Fokin
3. Christian Holm Christensen
4. ROOT team
5. ROOT folks from ROOTTALK
June 26,2002 [email protected], Moscow
0. Long lasting application
No penalty
1. Very wide used on Linux system (KDE)
2. Shipped with the source code and installation script
(no technical to take over but legal issue).
1. What is accepted level:
1. one pixel was that reliable level
2. dialog window is a mandatory attibute of any system
ROOT is designed like we 20 years ago
2. Qt - quality
library of Widget
weel-though separation of the automaically generated GUI and
user-provided custom actions. (Tha tallow to share GUI across applications)
3. Functionality: They treat MS a GUI standard
3. What ROOT may end up with. The best scenario we will ned up with somethin
Qt alike but in many years.
4. Price:
1. Free for non-commercial applcation on X11 platform
2. True cross platform (code designed and debugged on with free UNIX will
work in Windows
3. This allow to minimiz the number of Windows license
4. Windows license is really cheap anyway (acad. price $700/developer)
our experiecne did prove this worth to buy. It is much faster and better
to create GUI with Qt rather struggle with TG<classes>
4.1. Lack of documentation
4.2. Lack of functionality
5 License.
Qt 2. restrictive
Qt 3. can be accepted
