qgraphicsscene

I would like to draw a notification that always appears in the upper right corner of my QGraphicsView . However, QGraphicsItems positions are specified in scene coordinates, so if the user panned/zoomed to view a different part of the scene, this notification would move off screen. I have figured out that I could simulate this behavior by moving and scaling the notification any time the current view changes. But this seems terribly ineffective and not at all elegant. It seems that QGraphicsView should support this kind of behavior. The docs mention a flag ItemIsPanel that sounds hopeful, but

I want to implement arc in QGraphicsScene. I want that on clicking of three points my arc should be drawn such that on clicking of three points arc is drawn where first point will be starting of arc, second will be any point on arc and third will be end point of arc. I have tried studing drawArc function but got confused with startangle and spanangle. I was unable to set them dynamically. Please suggest me some way to proceed. I tried the solution to embend it in my project but got the following error: error: cannot allocate an object of abstract type 'arc' arcItem = new arc(++id, startP, midP

I have the following code to set up a QGraphicsScene . I wish to click on the scene and draw a point at the location I've clicked. How could I do this? This is my current code: MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); QGraphicsScene *scene; QGraphicsView *view = new QGraphicsView(this); view->setGeometry(QRect(20, 50, 400, 400)); scene = new QGraphicsScene(50, 50, 350, 350); view->setScene(scene); } phyatt UPDATE: There is a new class called QGraphicsSceneMouseEvent that makes this a little easier. I just finished an example