#include <QApplication>
#include <QtGui>

int main(int argc, char* argv[])
{
QApplication app(argc, argv);

QWidget* window = new QWidget();

QPushButton* quit = new QPushButton("Quit");
quit->resize(75, 30);
quit->setFont(QFont("Times", 18, QFont::Bold));
QObject::connect(quit, SIGNAL(clicked()), &app, SLOT(quit()));

QGraphicsScene* scene = new QGraphicsScene();


QGraphicsView* view = new QGraphicsView(scene);
view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
QVBoxLayout* layout = new QVBoxLayout();
layout->addWidget(quit);
layout->addWidget(view);

window->setLayout(layout);
window->showMaximized();


QGraphicsPixmapItem* immagineItem = scene->addPixmap(QPixmap("c:\\buddha.jpg"));
//QMessageBox::information(window, "lol", QString::number(/*view->width() / */immagineItem->pixmap().width()));
//QMessageBox::information(window, "lol", QString::number(view->width()));
view->scale((qreal)view->width() / immagineItem->pixmap().width(), (qreal)view->width() / immagineItem->pixmap().width());
return app.exec();
}

oho!