draw a point

[Malek]

It is very simple issue.I just draw it like this

QPen pen;
   pen.color().blue();
   QGraphicsScene *scene = new QGraphicsScene();
   scene->addEllipse(QRectF(0,0 ,10 ,10 ), pen, QBrush(Qt::red));
   ui->graphicsView->setScene(scene);

QPen pen;
   pen.color().blue();
   QGraphicsScene *scene = new QGraphicsScene();
   scene->addEllipse(QRectF(0,0 ,10 ,10 ), pen, QBrush(Qt::red));
   ui->graphicsView->setScene(scene);

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NOW !!!
You MUST help me in this.

1) I want to change the point location. It is always in the same location even when I replace (0,0 ,10,10) by (168,324,10,10) for example.

2) How can I change the location of the point as (Lat, Lon),Since my background will be the map of the WORLD.


THANKS FOR ALL.