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Image Processing & GUI Programming with Qt Why learn Qt? Qt Demos ...

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Programming with Qt. Edgardo Molina. CCNY. Why learn Qt? . ObjectOriented C++ GUI library (and more). . Crossplatform (WindowsMacLinux) ...

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Image Processing & GUI Programming with Qt Why learn Qt? Qt Demos EventDriven ProgrammingPage 11Image Processing & GUIProgramming with QtEdgardo MolinaCCNYWhy learn Qt?ObjectOriented C++ GUI library (and more)Crossplatform (WindowsMacLinux)Open Source & Commercial licensesResources: Documentation Mailing ListsForums etcUsed in industry:Adobe Google KDE Skype http://trolltech.com/products/qt/qtinuse/q tcustomersQt DemosMainwindowAffine TransformationsText EditorOpenGLEventDriven ProgrammingImperativemain() {step1();step2();return 0;}EventDrivenwhile(true) {processevent(Queue);setState();}Page 22EventDriven ProgrammingIn imperative programming the programmer has control of theorder of execution of functions. With eventdriven programmingthe user interaction determines the order of execution.EventDriven programs consist of an eventloop and an eventqueue.EventLoop: an infinite loop that either waits for events orprocesses events in the eventqueue.EventQueue: a queue which receives its input from userinteraction sensors or other events.GUIs are implemented using eventdriven programmingparadigmInstalling QtDownload Qt for your platformNote: The Windows opensource version onlyworks with Mingw compiler included in theinstaller.On Windows run installerMay need to add Qt libs to your environmentvariables if installer does not do so.On Mac and Linux follow instructions to buildProgramming with QtCODECompilingSave all your source files to a folder.Open your commandline:% cd /path/sourcecode/% qmake project% qmake% makeRun the executable or fix any errorsPage 33Programming with QtSignals and SlotsClasses must use the Q_OBJECT macro when using signalsslotsProgramming with QtQt provides some garbage collection. Thisonly works if you pass a parent to the classconstructors.QImage data allocated with new must bereleased manually with delete.QImageOpen an image: Qimage img(C:pathpic.jpg);Save an image: img.save(C:pathpic2.jpg);Read a pixel: QRgb colors = img.pixel(ij);Re ...

Source: www-cs.ccny.cuny.edu

 

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