QPolygonF::containsPoint function returns false when point is in area defined by polygon

QVector areaPoints; 
areaPoints.append(QPoint(-1,-1)); 
areaPoints.append(QPoint(-1,1)); 
areaPoints.append(QPoint(1,1)); 
areaPoints.append(QPoint(1,-1)); 
 
QPolygonF poligonF(areaPoints); 
QPointF testPointF(1.0, -1.0); 
bool result = polygon.containsPoint(testPointF, Qt::OddEvenFill);