Question

I’m trying to display a little square of solid color.

I’ve created a QGraphicsView widget myGraphicsView and call:

ui->myGraphicsView->setBackgroundBrush(QBrush(Qt::red, Qt::SolidPattern));

But it stays white. What am I doing wrong?

Answer 1

You need to set the QGraphicsScene to the QGraphicsView before anything is drawn:

ui->myGraphicsView->setScene(myScene);