/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkInteractorStyleTrackballActor.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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   this list of conditions and the following disclaimer.

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 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

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   misrepresented as being the original software.

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=========================================================================*/

// .NAME vtkInteractorStyleTrackballActor - Manipulation of an implicit plane.

// .SECTION Description
// vtkInteractorStyleTrackballActor Allows interactive definition of a plane
// by manipulating a vtkPlane's parameters.  
// The center of the plane is hot.  The center provides
// rotation (left mouse button), XY translation relative to camera (middle),
// and translation along camera's view-plane normal (right).


#ifndef __vtkInteractorStyleTrackballActor_h
#define __vtkInteractorStyleTrackballActor_h

#include "vtkInteractorStyle.h"
#include "vtkCellPicker.h"

#define VTK_INTERACTOR_STYLE_ACTOR_NONE    0
#define VTK_INTERACTOR_STYLE_ACTOR_ROTATE  1
#define VTK_INTERACTOR_STYLE_ACTOR_PAN     2
#define VTK_INTERACTOR_STYLE_ACTOR_ZOOM    3
#define VTK_INTERACTOR_STYLE_ACTOR_SPIN    4
#define VTK_INTERACTOR_STYLE_ACTOR_SCALE   5

class VTK_EXPORT vtkInteractorStyleTrackballActor : public vtkInteractorStyle
{
public:
  // Description:
  // This class must be supplied with a vtkRenderWindowInteractor wrapper or
  // parent. This class should not normally be instantiated by application
  // programmers.
  static vtkInteractorStyleTrackballActor *New();

  vtkTypeMacro(vtkInteractorStyleTrackballActor, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Generic event bindings must be overridden in subclasses
  void OnMouseMove  (int ctrl, int shift, int x, int y);
  void OnLeftButtonDown(int ctrl, int shift, int x, int y);
  void OnLeftButtonUp  (int ctrl, int shift, int x, int y);
  void OnMiddleButtonDown(int ctrl, int shift, int x, int y);
  void OnMiddleButtonUp  (int ctrl, int shift, int x, int y);
  void OnRightButtonDown(int ctrl, int shift, int x, int y);
  void OnRightButtonUp  (int ctrl, int shift, int x, int y);

protected:
  vtkInteractorStyleTrackballActor();
  ~vtkInteractorStyleTrackballActor();
  vtkInteractorStyleTrackballActor(const vtkInteractorStyleTrackballActor&) {};
  void operator=(const vtkInteractorStyleTrackballActor&) {};

  void RotateXY(int x, int y, int oldX, int oldY);
  void PanXY(int x, int y, int oldX, int oldY);
  void DollyXY(int dx, int dy);
  void SpinXY(int dx, int dy, int oldX, int oldY);
  void ScaleXY(int x, int y, int oldX, int oldY);
  void FindPickedActor(int x, int y);
  void Prop3DTransform(vtkProp3D *prop3D, double *boxCenter,
                      int numRotation, double **rotate,
                      double *scale);
  void Prop3DTransform(vtkProp3D *prop3D,float *boxCenter,
                      int NumRotation,double **rotate,
                      double *scale);
  
  int State;
  float MotionFactor;
  float RadianToDegree;                 // constant: for conv from deg to rad
  vtkProp3D *InteractionProp;
  double ViewUp[3];
  double ViewLook[3];
  double ViewRight[3];
  float ObjCenter[3];
  float DispObjCenter[3];
  float Radius;
  float NewPickPoint[4];
  float OldPickPoint[4];
  float MotionVector[3];
  double ViewPoint[3];
  double ViewFocus[3];
//  vtkAbstractPropPicker *InteractionPicker;
  vtkCellPicker *InteractionPicker;
};

#endif
