I´ve been reading about QGraphicsView/Scene/Item all day and still I fail to understand how it works. I started with QT Creator and added a QGraphicsView to the mainWindow. Then I subclassed QGraphicsScene and QGraphicsItem(I probably need to subclass the QGraphicsView later on). I use shapelib to open a shape-file and If I´ve done it right it will be implemented as a QGraphicsItem. I add the item to the scene and the scene to the view. I can see the map(shapefile) but it´s centered and very small. So I thought let´s change the coordinatesystem of the scene... And this is where I got stuck.
I know the boundaries of the GraphicsView and the Scene. I also know the boundaries of the shapefile. Why can´t I tell the scene to have the same boundaries as the shapefile but extend it to the size of the view!?
Maybe it isn´t hard but obviously I don´t have the brains for it so any help at all will be very appreciated.

Code for subclassed QGraphicsItem

Qt Code: 
  1. item::item(QGraphicsItem *parent)
  2.     : QGraphicsItem(parent)
  3. {
  4. }
  5.  
  6. QRectF item::boundingRect() const
  7. {
  8. 	QRectF recWindow;
  9. 	recWindow.setBottomLeft(QPointF(sBoundingBox.minX,sBoundingBox.minY));
  10. 	recWindow.setBottomRight(QPointF(sBoundingBox.maxX, sBoundingBox.minY));
  11. 	recWindow.setTopLeft(QPointF(sBoundingBox.minX,sBoundingBox.maxY));
  12. 	recWindow.setTopRight(QPointF(sBoundingBox.maxX,sBoundingBox.maxY));
  13. 	return recWindow;
  14. }
  15.  
  16. void item::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
  17. {
  18. 	OpenShapeFile("./Maps/Norden_wgs84.shp");
  19. 	painter->setRenderHint(QPainter::Antialiasing);
  20. 	painter->setBrush(Qt::blue);
  21.  
  22. 	for(int i = 0;i< vMap.size(); i++)
  23. 	{
  24. 		painter->drawPolyline(vMap.at(i)->p.data() ,vMap.at(i)->p.size());
  25. 	}
  26. }
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I´m not really doing anything in the subclassed QGraphicsScene yet so I don´t think there is any reason to show the code.

And here is the mainWindow
Qt Code: 
  1. IceChart3::IceChart3(QWidget *parent)
  2.     : QMainWindow(parent)
  3. {
  4. 	ui.setupUi(this);
  5.  
  6.         QRect sceneRect;
  7. 	sceneRect.setBottomLeft(QPoint(4,52));
  8. 	sceneRect.setBottomRight(QPoint(42, 52));
  9. 	sceneRect.setTopLeft(QPoint(4,72));
  10. 	sceneRect.setTopRight(QPoint(42,72));
  11.  
  12. 	scene = new MyScene(this);
  13. 	scene->setSceneRect(sceneRect);
  14.  
  15.         itemMap = new item();
  16.  
  17. 	scene->addItem(itemMap);
  18.  
  19. 	//Flip upside down.
  20. 	ui.graphicsView->scale(1,-1);
  21.  
  22. 	//Set scene to view
  23. 	ui.graphicsView->setScene(scene);
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