[osg-submissions] camera views

[Domenico Mangieri]

Hi Robert,

I added to the MatrixManipulator the option to set home position respect to 
the principal views of a model
FRONT, BACK, LEFT, RIGHT, BOTTOM, TOP, ISOMETRIC

These are quite common camera positions for cad like applications.

Here is the list of files changed :

MatrixManipulator   :         defines the HomePositionType enum
MatrixManipulator.cpp  :    Implements computeHomePosition(HomePositionType 
vtype) and computeHomePosition(HomePositionType vtype, const 
osg::BoundingSphere&)
                                          computeHomePosition() is now the 
FRONT view
                                          handle( .. ) uses keys F1..F6  and 
Space bar to switch between views  (arbitrary keys, feel free to change them 
if you like )

DriveManipulator.cpp
FlightManipulator.cpp
TerrainManipulator.cpp
TrackballManipulator.cpp  : handleing of  KEYDOWN is forward to parent ( 
MatrixManipulator::handle  )


Regards

Domenico. 
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