[PyQt] QGraphicsView view jumping bug

[Vincent Vande Vyvre]

Le 23/10/12 22:34, Zsolt Ero a écrit :
> OK, here is the smallest possible example I could make it. The bug
> happens when I click on the lower half of the image. Just copy a jpg
> image at the same folder and rename it to "big.jpg".
>
> Zsolt
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> On 23 October 2012 20:42, Phil Thompson <phil at riverbankcomputing.com
> <mailto:phil at riverbankcomputing.com>> wrote:
>
>     On Tue, 23 Oct 2012 20:20:30 +0100, Zsolt Ero <zsolt.ero at gmail.com
>     <mailto:zsolt.ero at gmail.com>> wrote:
>     > I'm having a weird problem: my whole QGraphicsView goes crazy if I
>     > uncomment the following lines in a class (of QtGui.QGraphicsItem):
>     >
>     > if len( self.points ) == 1:
>     >  rect = QtCore.QRectF( self.points[0].x()-self.radius,
>     > self.points[0].y()-self.radius,
>     >  self.points[0].x()+self.radius,
>     > self.points[0].y()+self.radius )
>     >  return rect
>     >
>     > Here is the full boundingRect function:
>     >
>     > def boundingRect( self ):
>     >  if len( self.points ) == 1:
>     > rect = QtCore.QRectF( self.points[0].x()-self.radius,
>     >  self.points[0].y()-self.radius,
>     > self.points[0].x()+self.radius,
>     >  self.points[0].y()+self.radius )
>     > return rect
>     >
>     > poly = QtGui.QGraphicsPolygonItem( self.polygon )
>     >  poly.setPen( self.pen )
>     > return poly.boundingRect()
>     >
>     > What happens is that the view moves to top-left corner
>     _sometimes_ when
>     the
>     > rectangle code is run.
>     >
>     > Here is my full code (just rename an image to big.jpg next to
>     the file):
>     > http://pastebin.com/h9tFZmpk
>     >
>     > I believe it's a bug in PyQt4, can you have a look at it?
>
>     Not without a short, complete example that demonstrates the problem.
>
>     Phil
>
>
>
>
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You must to set the geometry of your scene

self.scene.setSceneRect(0, 0, self.img.width(), self.img.height())

-- 
Vincent V.V.
Oqapy <https://launchpad.net/oqapy> . Qarte
<https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>