How to move an item on a GraphicsScene

[jacek]

// I want the item to move step by step after any 1000 ms on the Screen
QMoveEvent *event;
int x=event->pos().x();
int y=event->pos().y();
c1->moveBy((qreal)x,(qreal)y);

It won't work --- you take x and y values from an uninitialized object.

startTimer(1000);

When you use startTimer(), you have to reimplement QObject::timerEvent() and put the code that you want to run every second there.

You need something like:

void MainGui::timerEvent( QTimerEvent *e )
{
   Q_UNUSED( e);
   scene->advance();
}

void MainGui::timerEvent( QTimerEvent *e )
{
   Q_UNUSED( e);
   scene->advance();
}

To copy to clipboard, switch view to plain text mode 

You can also consider using QTimer instead of startTimer()/timerEvent().

To make scene->advance() work, you have to reimplement QGraphicsItem::advance() in your Container class or use QGraphicsItemAnimation.

P.S. Please, don't post the same question twice in two different threads.