What really is a QPolygon...

[giusepped]

Suppose the following code I supposed to do a union of polyogn

QPolygonF f,g;
 
 f<<QPointF(1,1)<<QPointF(10,29);
 g<<QPointF(100,100)<<QPointF(10,290);
 
 
  qSort(f.begin(),f.end(),lessThanPoint);
  qSort(g.begin(),g.end(),lessThanPoint);
 qDebug()<< f.united(g);

QPolygonF f,g;

 f<<QPointF(1,1)<<QPointF(10,29);
 g<<QPointF(100,100)<<QPointF(10,290);
 
 
  qSort(f.begin(),f.end(),lessThanPoint);
  qSort(g.begin(),g.end(),lessThanPoint);
 qDebug()<< f.united(g);

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Why I get the following result:

QPolygonF(QPointF(1, 1)QPointF(1, 1)QPointF(10, 29)QPointF(1, 1)QPointF(10, 290)QPointF(100, 100)QPointF(10, 290)QPointF(1, 1))



I should have simply the union of the point (a polygon of 4 points).
Maybe I am missing something?
G