Unsolved Struggling with QGraphicsView
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Hello there,
I'm having hard time using QGraphicsView to display images.
First, when I display an image for the first time, the image look very small despite the fact that I ask my view to fit the whole image.
In fact, I tried to display the QGraphicsView size by calling qDebug and it appeared that my QGraphicsView size was 28x28 after startup and first display, and after a second display it has been updated to the good size (wich was 800x800).Also, I created two QPushButton to zoom in and out and I connected them with a slot that set the view scale. But when I click on the button, the view actually change but with one or more clicks of delay (not always the same).
Here is my code :
// CONSTRUCTOR scene = new QGraphicsScene(this); view = new GraphicsView(scene,this); zoom_factor = 1; ... // DRAWING SLOT QImage image(file); transformedScene->setSceneRect(image.rect()); transformedScene->addPixmap(QPixmap::fromImage(image)); transformedImageContainer->fitInView(scene-sceneRect(),Qt::AspectRatioMode::KeepAspectRatio); ... // ZOOM IN AND OUT SLOTS void window::zoomIn() { zoom_factor *= 1.25; view->scale(zoom_factor, zoom_factor); view->update(); } void PreProcessScene::zoomOut() { zoom_factor *= 0.8; view->scale(zoom_factor, zoom_factor); view->update(); }
Do you know why do I get this strange behavior ?