[Qgis-developer] Viewport rotation: QgsMapCanvasMap and angles

[Sandro Santilli]

After many hours trying to figure out who was ruining my vector data
angles I finally found the QgsMapCanvasMap::paint method complaining
about DIFFERENT SIZE of image and item.

Indeed the documentation for QPainter::drawImage(QRect, QImage) says
that the image is scaled to fit the rectangle, which in my case it meant
also ruining the angles (different aspect ratio between the two).

I tested and can confirm that passing the image size to QPainter::drawImage,
rather than the item size, fixes all the angles.
Unfortunately doing so also leaves some spurious rendered area not-cleared
and dunno what other damages it could do.

So my question now is: who's responsible for setting the bounding
rectangle of the map canvas _map_ item ?

--strk;

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