A few small documentation shortages
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Like the QGraphicsItemGroup::addToGroup "documentation shortage":http://developer.qt.nokia.com/forums/viewthread/6653 also QGraphicsItem::removeFromGroup does undocumented actions. It will also regroup the removed item into an ancestor group if such is present. The documentation only states that it will be reparented to the group's parent item if present. You need to be aware of these if you're chaining items with multiple groups in some tree-like hierarchy.
Another small notice. The documentation of 'qreal QLineF::angle() const' states 'Returns the angle of the line in degrees' and goes on explaining positive and negative angles. Since angle() always returns a positive normalized angle of the line, it should state 'Returns the positive angle of the line in degrees' to be more clear.
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Please, use the documentation annotation features in the "documentation":http://developer.qt.nokia.com/doc here on devnet, and/or create "bugreports":http://bugreports.qt.nokia.com for these things. If you just post the issues here, they will get lost.