This question is related to: Forcing QGraphicsItem To Stay Put I'd like to have a QGraphicsItem on a fixed location when moving around in the scene. The suggested solution is to override the voi...

I'm looking for the most effective way to size a QGraphicsItem based on the length of a given QString, so that the text is always contained within the QGraphicsItem's boundaries. The idea is to kee...

I have multiple QGraphicsItems in scene spread across different parts of scene. In application there are different modes in one of mode user can scroll the scene (palm drag mode). To achieve scrol...

Use case: This should be a fairly common problem. In a normal QMainWindow with QMdiArea lives an mdiChild with a QGraphicsView. This view displays a QGraphicsScene with QGraphicsItems inside. A rig...

I create a custom QGraphicsItem. And overwrite the boundingRect() and paint(). QRectF myTile::boundingRect() const { return QRectF(xPos*10, yPos*10, 10, 10); } void myTile::paint(QPainter *paint...

One amazing feature of QGraphicsView is its ability to scale itself with its scene's content (every QGraphicsItem inserted in the scene actually). The QPixmap that I have inserted scales correctly,...

In a QGraphicsScene, I have a background set with a few QGraphicsItems on top of it. These graphics items are of arbitrary shape. I'd like to make another QGraphicsItem, i.e. a circle, which when p...

According to the QGraphicsItem destructor documentation, "It is more efficient to remove the item from the QGraphicsScene before destroying the item." Why is that? I can't think of how it could ma...

Probably a trick question, but I can't find the answer. I need to know when a QGraphicsItem gets selected. There must be a method that's called. I know QGraphicsItem::itemChange() but it's call...

According to the Qt docs, it "Prepares the item for a geometry change. Call this function before changing the bounding rect of an item to keep QGraphicsScene's index up to date. prepareGeometryChan...

I want to detect when the mouse cursor moves in over a QGraphicsItem while a mouse button is pressed, i.e. the button is pressed before the mouse enters the item. My first idea was to use hoverEnte...

I created a simple program that demonstrates the runtime error I'm getting with my Qt application that uses multiple inheritance. The inheritance tree looks like: QGraphicsItem (abstract) \ QGra...

Is there a way to restrict the area where a QGraphicsItem like QRect can be moved when setFlag(ItemIsMovable) is set? I'm new to pyqt and trying to find a way to move an item with the mouse, and t...

I have derived QGraphicsItem and QGraphicsScene classes. I want the items to be able to call scene() and get a derviedGraphicsItem * instead of a QGraphicsItem *, so I reimplemented QGraphicsScene:...

I have a QGraphicsScene that is filled with QGraphicsItems, and the user is able to pan and zoom around to inspect all of the various QGraphicsItems. However, I would like to have a QGraphics...

I am using Qt and C++ as my environment. I draw a QGraphicsView in my UI, then create a scene and add lines to that it. I run through an array of 5000 points and draw lines connecting each point. Q...

I want to make something like a hud. I have a QGraphicsScene with a huge QPixmap, that I added to a much smaller QGraphicsView. Now I need to add some control elements, like QLabel, QPushButton and...

How do I draw interactive widgets such as QButtons and Line Edits over a QGraphicsView? For ex, I have selected a region over an image in an image editing app which displays an image with QGraphics...

I have been toying with this piece of code: QGraphicsLineItem * anotherLine = this->addLine(50,50, 100, 100); qDebug() << anotherLine->scenePos(); QGraphicsLineItem * anotherLine2 = t...