On Thu, Jun 07, 2012 at 05:27:27AM -0700, Waitman Gobble wrote: > Till Oliver Knoll <till.oliver.kn...@gmail.com> wrote .. > > 2012/6/7 Waitman Gobble <uzi...@da3m0n8t3r.com>: > > > ... > > > When I load an image into QGraphicsScene and add the scene to > > > QGraphicsView, > > the QGraphicsView expands to image size, but if I clear and load another > > image > > which is smaller, it stays the same size. > > > > That is by design and documented: > > > > http://qt-project.org/doc/qt-4.8/qgraphicsscene.html#sceneRect-prop > > > > "...largest bounding rect of all items on the scene since the scene > > was created (i.e., a rectangle that grows when items are added to or > > moved in the scene, but never shrinks)." > > > > Try setting it to a "null" QRectF after removing the previous and > > loading the new image: to my understanding the next call to > > sceneRect() should then re-calculate the bounding rectangle, which > > should then be just as large as the new image item in the scene. > > > > Cheers, Oliver > > _______________________________________________ > > Interest mailing list > > Interest@qt-project.org > > http://lists.qt-project.org/mailman/listinfo/interest > > Thank you. > > This seems to work: > > QPixmap pm(path); > gs->clear(); > gs = new QGraphicsScene(this); //new > gs->addPixmap(pm); > gv->setScene(gs); > gv->update();
That creates a memory leak every time you call that function. What Oliver meant is to call gs->setSceneRect(QRectF()) after clearing the scene and before adding a new pixmap to the scene. I have not tested this though. regards, Andre _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
