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%  This example introduces the concepts of user interaction with VTK.
%  First, a different interaction style (than the default) is defined.
%  Second, the interaction is started. 


%  Next we create an instance of vtkConeSource and set some of its
%  properties. The instance of vtkConeSource "cone" is part of a visualization
%  pipeline (it is a source process object); it produces data (output type is
%  vtkPolyData) which other filters may process.
cone = vtkConeSource();
cone.SetHeight( 3.0 );
cone.SetRadius( 1.0 );
cone.SetResolution( 10 );

%  In this example we terminate the pipeline with a mapper process object.
%  (Intermediate filters such as vtkShrinkPolyData could be inserted in
%  between the source and the mapper.)  We create an instance of
%  vtkPolyDataMapper to map the polygonal data into graphics primitives. We
%  connect the output of the cone souece to the input of this mapper.
coneMapper = vtkPolyDataMapper();

%  Create an actor to represent the cone. The actor orchestrates rendering of
%  the mapper's graphics primitives. An actor also refers to properties via a
%  vtkProperty instance, and includes an internal transformation matrix. We
%  set this actor's mapper to be coneMapper which we created above.
coneActor = vtkActor();

%  Create the Renderer and assign actors to it. A renderer is like a
%  viewport. It is part or all of a window on the screen and it is responsible
%  for drawing the actors it has.  We also set the background color here.
ren1 = vtkRenderer();
ren1.SetBackground(0.1, 0.2, 0.4);

%  Finally we create the render window which will show up on the screen
%  We put our renderer into the render window using AddRenderer. We also
%  set the size to be 300 pixels by 300.
renWin = vtkRenderWindow();
renWin.SetSize(300, 300);

%  The vtkRenderWindowInteractor class watches for events (e.g., keypress,
%  mouse) in the vtkRenderWindow. These events are translated into
%  event invocations that VTK understands (see VTK/Common/vtkCommand.h
%  for all events that VTK processes). Then observers of these VTK
%  events can process them as appropriate.
iren = vtkRenderWindowInteractor();

%  By default the vtkRenderWindowInteractor instantiates an instance
%  of vtkInteractorStyle. vtkInteractorStyle translates a set of events
%  it observes into operations on the camera, actors, and/or properties
%  in the vtkRenderWindow associated with the vtkRenderWinodwInteractor. 
%  Here we specify a particular interactor style.
style = vtkInteractorStyleTrackballCamera();

%  Unlike the previous scripts where we performed some operations and then
%  exited, here we leave an event loop running. The user can use the mouse
%  and keyboard to perform the operations on the scene according to the
%  current interaction style.

%  Initialize and start the event loop. Once the render window appears, mouse
%  in the window to move the camera. The Start() method executes an event
%  loop which listens to user mouse and keyboard events. Note that keypress-e
%  exits the event loop. (Look in vtkInteractorStyle.h for a summary of events, or
%  the appropriate Doxygen documentation.)


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