qgraphicsview as mainwindow

[Ashwin]

Window::Window(QWidget *parent): KMainWindow(parent)
{
view=new QGraphicsView(this);
QGraphicsScene scene(0,0,1366,768);
scene.addText("Hello, world!");
view->setScene(&scene);
view->show();
}

i created above as my mainwindow .
"hello world " is not displaying on the window

[helloworld]

The QGraphicsScene is destroyed when falling out of scope if you create it on the stack.

Not sure about KMainWindow, but in a normal QMainWindow subclass you could do something like:

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QGraphicsView *view = new QGraphicsView;
    QGraphicsScene *scene = new QGraphicsScene(0, 0, 1366, 768, this);
    scene->addText("Hello, world!");
    view->setScene(scene);
    setCentralWidget(view);
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QGraphicsView *view = new QGraphicsView;
    QGraphicsScene *scene = new QGraphicsScene(0, 0, 1366, 768, this);
    scene->addText("Hello, world!");
    view->setScene(scene);
    setCentralWidget(view);
}

To copy to clipboard, switch view to plain text mode 

[Ashwin]

QGraphicsView *view=new QGraphicsView(this);
QGraphicsScene *scene=new QGraphicsScene(0, 0, 1366, 768);

worked