Cross platform qt based implementation of low level gui layer of root
Sponsored Links
This presentation is the property of its rightful owner.
1 / 17

Cross-Platform Qt-Based Implementation of Low Level GUI Layer of ROOT PowerPoint PPT Presentation

  • Uploaded on
  • Presentation posted in: General

Cross-Platform Qt-Based Implementation of Low Level GUI Layer of ROOT. V.Fine BNL, Upton. Why ROOT is multi-platform ?. Just to be healthy ! Just because there are plenty of Windows users around. ROOT for different platforms

Download Presentation

Cross-Platform Qt-Based Implementation of Low Level GUI Layer of ROOT

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Cross-Platform Qt-Based Implementation of Low Level GUI Layer of ROOT


BNL, Upton

[email protected]

ACAT2002, Moscow

Why ROOT is multi-platform ?

  • Just to be healthy !

  • Just because there are plenty of Windows users around

[email protected]

ACAT2002, Moscow

ROOT for different platforms

[email protected]

ACAT2002, Moscow

ROOT low level GUI interface





3 different implementations to develop and support





[email protected]

ACAT2002, Moscow

ROOT Qt-based GUI interface




only one (!) implementation


[email protected]

ACAT2002, Moscow

What is Qt

[email protected]

ACAT2002, 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

[email protected]

ACAT2002, 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 ? ”

[email protected]

ACAT2002, 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

0.5 day to implement

1 day to implement !

2 days to implement

[email protected]

ACAT2002, Moscow

Qt designer to create ROOT embedded canvases

[email protected]

ACAT2002, Moscow

A test application to combine ROOT and Qt Widget

[email protected]

ACAT2002, Moscow

Where to get Qt-ROOT from

[email protected]

ACAT2002, Moscow


[email protected]

ACAT2002, Moscow


  • 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.

  • [email protected]

    ACAT2002, Moscow


    There 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.

    [email protected]

    ACAT2002, Moscow

    Thank you

    • Special thanks:

    • Torre Wenaus, Yuri Fisyak, Victor Perevoztchikov

    • Anton Fokin

    • Christian Holm Christensen

    • ROOT team

    • ROOT folks from ROOTTALK

    [email protected]

    ACAT2002, 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

    [email protected]

    ACAT2002, Moscow

  • Login