QGraphicsView scale function

[forrestfsu]

I'm currently using graphicsview to simulate zooming in/out on an image. Zooming in seems to be perfect, but when I zoom out passed the original size of the graphicsview it begins to tile the images. I only want one image to show up...not tiled. Is there any ideas on the best way about trying to solve this problem?

[wysota]

Hard to tell without seeing your code. Maybe you're instantiating many items instead of one?

[forrestfsu]

Below is basicaly what my code is for that particular part.

scene = new QGraphicsScene;
scene->setSceneRect(0, 0, 512, 640);
scene->setItemIndexMethod(QGraphicsScene::NoIndex);
ui.graphicsView->setScene(&*scene);
 
void Form::scaleView(qreal scaleFactor)
{
  ui.graphicsView->scale(scaleFactor, scaleFactor);
}
 
bool Form::eventFilter(QObject *o, QEvent *e)
{
  if (0 == ui.graphicsView->viewport()){
    if (e->type() == QEvent::Wheel)
    {
      QWheelEvent *q = dynamic_cast<QWheelEvent*>(e);
      scaleView(pow((double)2, -q->delta() / 240.0));
      e->accept();
      return true;
    }
  }
}

scene = new QGraphicsScene;
scene->setSceneRect(0, 0, 512, 640);
scene->setItemIndexMethod(QGraphicsScene::NoIndex);
ui.graphicsView->setScene(&*scene);

void Form::scaleView(qreal scaleFactor)
{
  ui.graphicsView->scale(scaleFactor, scaleFactor);
}

bool Form::eventFilter(QObject *o, QEvent *e)
{
  if (0 == ui.graphicsView->viewport()){
    if (e->type() == QEvent::Wheel)
    {
      QWheelEvent *q = dynamic_cast<QWheelEvent*>(e);
      scaleView(pow((double)2, -q->delta() / 240.0));
      e->accept();
      return true;
    }
  }
}

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