WebOct 20, 2014 · The problem is that my custom arrows (they inherit QGraphicsPathItem) disappear from the scene whenever it's boundingRect () center is scrolled off the view. Everytime the scene expands, both it's sceneRect () and the view's sceneRect () are updated as well. I've: set ui->graphicsView->setViewportUpdateMode … Web我試圖找出如何在QGraphicsView中當前可以看到的像素與QGraphicsItem圖像中的實際像素之間進行映射。 例如,如果我的查看器是 x 而我的圖像是 x ,那么當圖像加載並且不受影響時,圖像的 , 像素對應於查看者的 , 像素。 現在,如果我將圖像拖動到右邊的 個像素,那么 …
MousePressEvent, position offset in QGraphicsView
WebOct 9, 2024 · If the first is selected, then by clicking on the Graphicsscene a GraphicsItem will be added to the scene. I would like to have a button, which would change the color of these points by pressing it. The color doesn't matter. It could be red for example. How could I do that? Thank you! Webdetection mechanisms use boundingRect() to provide an efficient: 99: cut-off. The fine grained collision algorithm in: 100: collidesWithItem() is based on calling shape(), which returns an: 101: accurate outline of the item's shape as a QPainterPath. 102: 103: QGraphicsScene expects all items boundingRect() and shape() to: 104: remain … great movie snacks to make
python - Changing the color of a QGraphicsItem - Stack Overflow
Webvirtual ~MyQGraphicsObject (); virtual QRectF boundingRect () const; virtual QPainterPath shape () const; virtual void paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget); virtual bool sceneEvent (QEvent *event); private: QBrush brush_; }; MyQGraphicsObject::MyQGraphicsObject (QGraphicsItem* parent) WebWithin the graphicsView we have QGraphicsScene (scene). We'll add items to the scene and only items within the bounding box, sceneRect will be displayed. Otherwise it will be clipped away. The red box is the … WebNov 13, 2011 · sceneRect = graphicsView.mapToScene (graphicsView.rect ()).boundingRect () In case there is a shear or rotation transformation present it gives you the bounding rectangle of the visible scene area. If you do not have such transformations (only shift or zoom) the returned rectangle is the exact scene area. great movies of all time list