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);
    QLabel       lbl;  

    lbl.setPixmap(QPixmap(":/happyos.png"));
    
    QGraphicsColorizeEffect effect;
    lbl.setGraphicsEffect(&effect);

    QPropertyAnimation anim(&effect, "color");
    anim.setStartValue(QColor(Qt::gray));
    anim.setKeyValueAt(0.25f, QColor(Qt::green));
    anim.setKeyValueAt(0.5f, QColor(Qt::blue));
    anim.setKeyValueAt(0.75f, QColor(Qt::red));
    anim.setEndValue(QColor(Qt::black));
    anim.setDuration(3000);
    anim.setLoopCount(-1);
    anim.start();

    lbl.show();

    return app.exec();
}