Using a QGraphicsView Widget
Maybe I am not following the correct workflow, but this has worked on other elements.
I am using Qt Creator 3.6.1, which has Qt 5.6.0 MSVC 2013 on a Windows PC.
I added a QGraphicsView widget to the Window form, and I want to draw a rectangle in it.
In the form's constructor, I put the following code, the last line of which causes a segmentation fault. Note that the rect is a data member of the Form's class. (The first line was already there).
ui->setupUi(this); rect.setRect(10,10,20,30); ui->graphicsView->scene()->addItem(&rect);
I also tried putting the rect on the heap like this.
rect = new QGraphicsRectItem(10,10,20,30); ui->graphicsView->scene()->addItem(rect);
Same problem. The Segfault occurs in the addItem call.
Does the scene need to be allocated? I don't see a setScene method, so I assumed that the framework initialized everything.
@Mister-Rose Hi! Yes, you need to create the scene, too, and give it to the view:
QGraphicsScene *scene = new QGraphicsScene(this); ui->graphicsView->setScene(scene);
Thank you. Works as expected.