Does this work?

Qt Code: 
  1. #include <QtGui>
  2. #include <QPropertyAnimation>
  3.  
  4. class RectItem : public QObject, public QGraphicsRectItem {
  5.   Q_OBJECT
  6.   Q_PROPERTY(QPointF pos READ pos WRITE setPos)
  7. public:
  8.   RectItem(const QRectF &rect, const QPen &pen, const QBrush &brush) : QObject(), QGraphicsRectItem(rect){
  9.     setPen(pen);
  10.     setBrush(brush);
  11.   }
  12. };
  13.  
  14. #include "main.moc"
  15.  
  16. int main(int argc, char **argv){
  17.   QApplication app(argc, argv);
  19.   view.setAttribute(Qt::WA_TranslucentBackground);
  20.   view.viewport()->setAttribute(Qt::WA_TranslucentBackground);
  21.   QGraphicsScene scene(QRectF(0,0,1000,800));
  22.   view.setScene(&scene);
  23.   RectItem *rect = new RectItem(QRectF(0,0,200,100), QPen(Qt::red), Qt::blue);
  24.   scene.addItem(rect);
  25.   QPropertyAnimation *anim = new QPropertyAnimation(rect, "pos");
  26.   anim->setDuration(10000);
  27.   anim->setStartValue(scene.sceneRect().topLeft());
  28.   anim->setEndValue(scene.sceneRect().bottomRight());
  29.   anim->start();
  30.   view.show();
  31.   return app.exec();
  32. }
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