int main(int argc, char *argv[])
{
QApplication a(argc, argv);
std::random_device rd;
random_engine gen(rd());
int imageSize = 300;
QList<QImage> images;
for (int n = 0; n < 28; ++n) images << randomImage(imageSize, gen);
std::uniform_int_distribution<> dImage(0, images.size()-1);
QStackedWidget display;
QPushButton ready("I'm Ready!");
QLabel label, labelHidden;
display.addWidget(&ready);
display.addWidget(&label);
display.addWidget(&labelHidden);
QTimer splashTimer;
QStateMachine machine;
QState s1(&machine), s2(&machine), s3(&machine), s4(&machine);
splashTimer.setSingleShot(true);
QObject::connect(&s1, &QState::entered, [&]{
display.setCurrentWidget(&ready);
ready.setDefault(true);
ready.setFocus();
});
s1.addTransition(&ready, "clicked()", &s2);
QObject::connect(&s2, &QState::entered, [&]{
label.setPixmap(QPixmap::fromImage(images.at(dImage(gen))));
display.setCurrentWidget(&label);
splashTimer.start(250 + std::uniform_int_distribution<>(1500, 3000)(gen));
});
s2.addTransition(&splashTimer, "timeout()", &s3);
QObject::connect(&s3, &QState::entered, [&]{
display.setCurrentWidget(&labelHidden);
splashTimer.start(2000);
});
s3.addTransition(&splashTimer, "timeout()", &s4);
QObject::connect(&s4, &QState::entered, [&]{
display.setCurrentWidget(&label);
splashTimer.start(3000);
});
s4.addTransition(&splashTimer, "timeout()", &s1);
machine.setInitialState(&s1);
machine.start();
display.show();
return a.exec();
}
static QByteArray randomJPEGByteArray(int w=512, int h=512, int q=85 )
{
QImage image=randomImage(w,h);
QBuffer bu;
bu.open(QBuffer::WriteOnly);
QImageWriter iw;
iw.setFormat("jpeg");
iw.setDevice(&bu);
iw.setOptimizedWrite(true );
iw.setQuality(q);
iw.setCompression(9);
iw.setProgressiveScanWrite(true );
iw.write( image );
bu.close();
QByteArray ba=bu.buffer();
//utility::byteArrayToFile("random_test.jpeg",ba );
//qDebug()<<"Random JPEG image of size "<<w<<"x"<<h<<" was "<< utility::humanReadableSize(ba.size())<< "("<<(qreal)ba.size()/((qreal)w*h) << " bytes/pixel)";
return ba;
}
static QByteArray randomImageByteArray(int w=512, int h=512 )
{
QImage image=randomImage(w,h);
QByteArray ba=imageToByteArray(image);
return ba;
}
