• QT-Development

QT-Development

Installation of QT, QT-Creator and the QWT libraries

/Installation, using QT-Creator 2.2 and QWT 6.0

/Installation, using the Ubuntu package (depreciated)

Creating a simple QWT project with QT-Creator

Start qtcreater from the command line:

qtcreator

Select:
Create Project
  -> QT-C++-Project
    -> QT-GUI-Application

Enter a name, e.g. FirstProject
Press:
EnterY
   -> Enter
      -> Enter
         -> Enter

Now you should have a new GUI project.

If you you click "Design" at the left, you should get the QT-Designer view.

If you scroll down at the left you should see the QwtWidgets, and should be able to drag them onto the form.

Compiling QWT projects

To be able to compile the project, you have just created, you must add the following lines to the .pro file (in this case: FirstProject.pro):

If you use qwt 5.x from the Ubuntu packages:

INCLUDEPATH += /usr/include/qwt-qt4
LIBS += /usr/lib/libqwt-qt4.so.5

If you use Qwt 6.x:

INCLUDEPATH += /usr/local/qwt-6.0.1/include
LIBS += /usr/local/qwt-6.0.1/lib/libqwt.so.6

Books

There are two good, free books, that give an introduction to C++ and QT (not to QWT, though):

• An Introduction to Design Patters in C++ with QT4

• C++ GUI Programming with QT4

Hints for Linux newbies

Finding a file:

sudo updatdb      # updates the file database; might need some minutes
locate qwt_plot.h # finds all the files and directories, that contain the given string

Updating the library cache:

sudo ldconfig

This is needed, when a dynamic library (.so file) is not found, but it exists in one of the configured places. It rescans the configured library search path.

Any questions?

Become a member of the QT Centre forum and ask your questions there: http://www.qtcentre.org/forum/

There is a subforum, dedicated to the Qwt library: http://www.qtcentre.org/forums/23-Qwt

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