[Qt-interest] QGraphicsScene pos

[pmqt71]

Ok, thanks a lot.

I actually was expecting this behaviour without calling any fitInView
method.

Just another question:

I have the QRectF  -50.0, -50.0, 50.0, 50.0

the width is 50??

qDebug() << "width=" << rect.width();  //returns 50




thanks
pm





2010/10/26 Sean Harmer <sean.harmer at maps-technology.com>

> Hi,
>
> > myScene->setSceneRect( -50.0, -50.0, 50.0, 50.0 );
> > on the following event handler, I want the x and y within the scene rect.
>
> > void MyGraphicsScene::mouseDoubleClickEvent ( QGraphicsSceneMouseEvent *
> > mouseEvent)
> > {
> >     QRectF rect = sceneRect();  //this gives -50.0, -50.0, 50.0, 50.0
> >
> >     //but the following returns something out of the sceneRect - e.g.
> 106,
> > -91 double-clicking in the top right corner
> >
> >     QPointF pointScene = mouseEvent->lastScenePos ();
> >
> >     // is it a view related point?
> >    QPointF point = this->views()[0]->mapToScene(pointScene.toPoint()); //
> > but this returns -51, -183
> > }
> >
> > The QGraphicsView is added into a layout and the mainWindow is resizable,
> > so the size of the widget is not fixed.
>
> By default the scene is displayed in the view at a scale of 1.0. So if your
> view's viewport is larger than 100x100 pixels then it will be displaying
> regions outside of your scenerect so the above code and results looks
> feasible
> to me.
>
> If you want your scene to fill your view you will need to call
> QGraphicsScene::fitInView() to change the view transformation before you
> start
> double-clicking.
>
> This type of thing is much easier to visualise if you add a small rect at
> each
> corner of your scene rect for example.
>
> HTH,
>
> Sean
>
> >
> >
> >
> > thanks
> >
> > pm
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