QGraphicsView coordinate system

[wysota]

I'd say the code should be:

void Shot::newShot(QGraphicsScene * scene, double x, double y)
{
    ball = new QGraphicsEllipseItem(-5,-5,10,10);
    scene->addItem(ball); // adds new item to the scene, not to the GraphicsItem("cannon")
    ball->setPos(x,x);
}

void Shot::newShot(QGraphicsScene * scene, double x, double y)
{
    ball = new QGraphicsEllipseItem(-5,-5,10,10);
    scene->addItem(ball); // adds new item to the scene, not to the GraphicsItem("cannon")
    ball->setPos(x,x);
}

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