[PyQt] Problems with custom QGraphicsItem

Antonio Valentino antonio.valentino at tiscali.it
Mon Jan 4 11:54:59 GMT 2010

Hi list,
I' having some problem with a custom QGraphicsItem: the option parameter seems to contain wrong values.
Using the included test code I would expect an option.levelOfDetail value of 0.5 and an option.exposedRect smaller than the entire item rect.
Running the following test cone on Mac OS X Snow Leopard I always get:

option.exposedRect PyQt4.QtCore.QRectF(0.0, 0.0, 1024.0, 1024.0)
option.levelOfDetail 1.0

Is it a bug?

import sys
from PyQt4 import QtCore, QtGui

class GraphicsItem(QtGui.QGraphicsItem):
    data = QtGui.QImage(':/trolltech/qmessagebox/images/qtlogo-64.png')
    data = data.scaled(1024, 1024, QtCore.Qt.KeepAspectRatio)

    def boundingRect(self):
        return QtCore.QRectF(self.data.rect())

    def paint(self, painter, option, widget):
        print 'option.exposedRect', option.exposedRect
        print 'option.levelOfDetail', option.levelOfDetail
        exposedData = self.data.copy(option.exposedRect.toAlignedRect())
        painter.drawImage(option.exposedRect, exposedData)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    w = QtGui.QGraphicsView()
    w.resize(400, 300)
    scene = QtGui.QGraphicsScene(w)
    w.scale(0.5, 0.5)

Mac OS X 10.6.2 Snow Leopard
Python	2.6.1 (system python)
sip	4.9.3
PyQt4	4.6.2
Qt	4.6.0 (cocoa 64bit)

Best regards

Antonio Valentino

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