Re: Newbie needs advice - QGraphics

[Raccoon29]

{Forked from http://www.qtcentre.org/forum/f-newb...hics-7728.html}

QGraphicsView *view = new QGraphicsView(this);
QGraphicsScene *scene  = new QGraphicsScene(view);
scene->setSceneRect( 0, 0, 1000, 1000 ); //you can adjust this as you need
view->setScene(scene);
setCentralWidget(view);

QGraphicsView *view = new QGraphicsView(this);
QGraphicsScene *scene  = new QGraphicsScene(view);
scene->setSceneRect( 0, 0, 1000, 1000 ); //you can adjust this as you need
view->setScene(scene);
setCentralWidget(view);

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Looking to your code, I remember the code piece in the Qt reference, which says:

QGraphicsScene scene;
 scene.addText("Hello, world!");
 
 QGraphicsView view(&scene);
 view.show();

QGraphicsScene scene;
 scene.addText("Hello, world!");

 QGraphicsView view(&scene);
 view.show();

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and I tryed this code, obtaining a well big exception, after a little modify:

QGraphicsScene scene;
scene.addText("Hello, world!");
ui.graphicsviewobj->setScene(&scene);

QGraphicsScene scene;
scene.addText("Hello, world!");
ui.graphicsviewobj->setScene(&scene);

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(ui object has been previously allocated)
Instead of starting a new thread, I ask "why this" here, since I think it is fair in-topic...

[jacek]

Haven't you forgot to ask the question?

It seems that your problem is that you create the scene on the stack and it goes out of scope.