fillRect does not display anything?

[Ishmael]

Ok, I'm missing something simple here. For some reason, QPainter isn't displaying anything. I thought this code should simply fill the background of the scene with blue. Any ideas? This is the entirety of my code:

#include <QtGui>
 
int main(int argc, char **argv){
  QApplication app(argc, argv);
  QGraphicsView view;
  QGraphicsScene scene;
  view.setScene(&scene);
 
  QPainter painter;
 
  QRectF sceneRect = scene.sceneRect();
  painter.fillRect(sceneRect, Qt::blue);
 
  view.show();
  return app.exec();
}

#include <QtGui>

int main(int argc, char **argv){
  QApplication app(argc, argv);
  QGraphicsView view;
  QGraphicsScene scene;
  view.setScene(&scene);

  QPainter painter;
  
  QRectF sceneRect = scene.sceneRect();
  painter.fillRect(sceneRect, Qt::blue);

  view.show();
  return app.exec();
}

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