main.cpp

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// ======================================================================
//  main.cpp
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#include <QtWidgets>

// ----------------------------------------------------------------------
int main(int argc, char** argv)
{
    QApplication   app(argc, argv);
    QGraphicsScene scene(QRectF(0, 0, 400, 400));
    QGraphicsView  view(&scene);

    QPushButton cmd("Quit");
    QGraphicsProxyWidget* pproxyWidget = scene.addWidget(&cmd);
    QTransform            transform    = pproxyWidget->transform();

    transform.translate(100, 350);
    transform.rotate(-45, Qt::YAxis);
    transform.scale(8, 2);
    pproxyWidget->setTransform(transform);
    QObject::connect(&cmd, SIGNAL(clicked()), &app, SLOT(quit()));

    QDial dia;
    dia.setNotchesVisible(true);
    pproxyWidget = scene.addWidget(&dia);
    transform    = pproxyWidget->transform();

    transform.scale(4, 2);
    transform.rotate(-45, Qt::YAxis);
    pproxyWidget->setTransform(transform);
    
    QProgressBar prb;
    prb.setFixedSize(500, 40);
    pproxyWidget = scene.addWidget(&prb);
    transform    = pproxyWidget->transform();

    transform.translate(20, 200);
    transform.scale(2, 2);
    transform.rotate(80, Qt::YAxis);
    transform.rotate(30, Qt::XAxis);
    pproxyWidget->setTransform(transform);

    QObject::connect(&dia, SIGNAL(valueChanged(int)), 
                     &prb, SLOT(setValue(int))
                    );

    view.rotate(15);
    view.resize(500, 500);
    view.show();

    app.setStyle("Windows");
  
    return app.exec();
}