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 … WebSep 20, 2024 · My solution will fit the height of the smallest rectangle that encapsulates all the items (sceneRect) to the viewport of the QGraphicsView. So set the height of the items a value not so small so that the image quality is not lost. I …
How to make the bounding rect of a selected qgraphicsitem …
WebIt sets the scene rectangle; the bounding rectangle of the scene. The scene rectangle defines the extent of the scene. It is primarily used by QGraphicsView to determine the view's default scrollable area, and by … 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) chip encapsulation
python - How to properly scale GraphicsScene - Stack Overflow
WebMar 8, 2024 · In a separate subclass of QGraphicsItemGroup say MyQGraphicsItemGroup we can overload the method virtual QRectF boundingRect () const override so that childrenBoundingRect () is called. QRectF MyQGraphicsItemGroup::boundingRect () const { // must be overloaded, otherwise the boundingrect will only be actualized on // additem … 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 … WebFirst of all, QGraphicsItem::boundingRect() returns a copy of the rect. Changing it has no effect on the actual item. To change an item's geometry, you need to override that function and return a different rect. And call prepareGeometryChange() when you actually change it.. Now, if all you want is to fit the item in QGraphicsView's viewport, use … chip ensdorf