[PyQt] Problem with QGraphics

[Luigi Curzi]

--- Lun 10/11/08, Andreas Pakulat <apaku at gmx.de> ha scritto:

> Da: Andreas Pakulat <apaku at gmx.de>
> Oggetto: Re: [PyQt] Problem with QGraphics
> A: pyqt at riverbankcomputing.com
> Data: Lunedì 10 novembre 2008, 11:33
> On 10.11.08 09:23:03, Luigi Curzi wrote:
> > --- Lun 10/11/08, Andreas Pakulat <apaku at gmx.de>
> ha scritto:
> > 
> > > Da: Andreas Pakulat <apaku at gmx.de>
> > > Oggetto: Re: [PyQt] Problem with QGraphics
> > > A: pyqt at riverbankcomputing.com
> > > Data: Lunedì 10 novembre 2008, 09:25
> > > On 09.11.08 22:05:47, Luigi Curzi wrote:
> > > > hello.
> > > > i have a problem whit qgraphics: i wrote
> these lines:
> > > > pixmap =
> > >
> QtGui.QPixmap("/media/glorious/datiVari/progettiProgrammazione/bitslaiser/f.jpg")
> > > > scene =
> QtGui.QGraphicsScene(QtCore.QRectF(0.0, 0.0,
> > > 300.0, 300.0))
> > > > scene.addPixmap(pixmap)
> > > > scene.addText("Hello, world!")
> > > > self.ui.graphicsView.setScene(scene)
> > > > self.ui.graphicsView.show()
> > > > 
> > > > graphicsView is a view created whit qt4
> designer;
> > > > i don't receive any error, but it
> doesn't
> > > appear anything.
> > > > in the gui's code i have these lines:
> > > > self.graphicsView =
> > > QtGui.QGraphicsView(self.centralwidget)
> > > >
> > >
> self.graphicsView.setGeometry(QtCore.QRect(50,100,741,431))
> > > >
> > >
> self.graphicsView.setObjectName("graphicsView")
> > > > 
> > > > do i forget something? what can i do?
> > > 
> > > Yes, you didn't call setupUi() anywhere. I
> suggest to
> > > have a look at the
> > > designer manual, it explains how ui-files in Qt4
> work. You
> > > need to create a
> > > QWidget yourself and apply the ui to it to see
> something.
> > > Also the
> > > self.ui.graphicsView.show() is not needed.
> > > 
> > 
> > excuse me, i wasn't clear:
> > the lines i posted are in a function (that is in the
> main class) that is executed when i click on a button; the
> gui file, that i created with qt4-designer, contains setupUi
> and works, and also other functions connected with the gui
> items work.
> > the lines above don't work with or without
> "self.ui.graphicsView.show()"; i use qt/pyqt in
> debian testing and the file "f.jpg" exists.
> 
> Hmm... Ah... I overlooked something, you create local
> objects for
> pixmap+scene, both of them are going to be deleted as soon
> as the function
> call returns. Which means the graphicsview will have no
> scene attached to
> it. So just extend their lifetime by attaching them to self
> for example.
> 
thanks;
it works.

luigi


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