QGraphicsScene background

[goldhappywang]

hi all:
I set a file(*.jpg) at the background of QGraphicsScene, but the picture as tiling on the scene , I want to tensilie the picture on the scene, what to do it?
thanks a lot.
the code :

int screen_width = QApplication::desktop()->width();
    int screen_height = QApplication::desktop()->height();
 
    scene = new QGraphicsScene(0,0,screen_width,screen_height);
    airview = new QGraphicsView();   
    setCentralWidget(airview);
    QPixmap pim("./images/airport.jpg");
    scene->setBackgroundBrush(pim.scaled(screen_width,screen_height,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
    airview->setScene(scene);

int screen_width = QApplication::desktop()->width();
    int screen_height = QApplication::desktop()->height();

    scene = new QGraphicsScene(0,0,screen_width,screen_height);
    airview = new QGraphicsView();   
    setCentralWidget(airview);
    QPixmap pim("./images/airport.jpg");
    scene->setBackgroundBrush(pim.scaled(screen_width,screen_height,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
    airview->setScene(scene);

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