elastic QGraphicsItem (layout problem)

**scascio** · 11th November 2009, 17:12

You only need to compute the right scale factor, according to the size of the widget,.

try something like this :

Qt Code:

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void YourGraphicsView::resizeEvent ( QResizeEvent * event ) {
 
  QGraphicsView::resizeEvent(event);
 
  const QSize& oldSize = event->oldSize();
  const QSize& newSize = event->size();
 
  //be aware of integer division and division by zero
  double scaleFactorX = (oldSize.width ()>0) ? ((double)newSize.width())/oldSize.width ():1;
  double scaleFactorY = (oldSize.height()>0) ?((double)newSize.height())/oldSize.height():1;
 
  //sclae the view
  scale(scaleFactorX, scaleFactorY);
}

void YourGraphicsView::resizeEvent ( QResizeEvent * event ) {

  QGraphicsView::resizeEvent(event);

  const QSize& oldSize = event->oldSize();
  const QSize& newSize = event->size();

  //be aware of integer division and division by zero
  double scaleFactorX = (oldSize.width ()>0) ? ((double)newSize.width())/oldSize.width ():1;
  double scaleFactorY = (oldSize.height()>0) ?((double)newSize.height())/oldSize.height():1;

  //sclae the view
  scale(scaleFactorX, scaleFactorY);
}

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But I am not sure that the behaviour will be correct for all cases.