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

  Program:   Visualization Toolkit
  Module:    vtkCameraRepresentation.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkCameraRepresentation - represent the vtkCameraWidget
// .SECTION Description
// This class provides support for interactively saving a series of camera
// views into an interpolated path (using vtkCameraInterpolator). The class
// typically works in conjunction with vtkCameraWidget. To use this class
// simply specify the camera to interpolate and use the methods
// AddCameraToPath(), AnimatePath(), and InitializePath() to add a new camera
// view, animate the current views, and initialize the interpolation.

// .SECTION See Also
// vtkCameraWidget vtkCameraInterpolator


#ifndef __vtkCameraRepresentation_h
#define __vtkCameraRepresentation_h

#include "vtkBorderRepresentation.h"

class vtkRenderer;
class vtkRenderWindowInteractor;
class vtkCamera;
class vtkCameraInterpolator;
class vtkPoints;
class vtkPolyData;
class vtkTransformPolyDataFilter;
class vtkPolyDataMapper2D;
class vtkProperty2D;
class vtkActor2D;

class VTK_WIDGETS_EXPORT vtkCameraRepresentation : public vtkBorderRepresentation
{
public:
  // Description:
  // Instantiate this class.
  static vtkCameraRepresentation *New();

  // Description:
  // Standard VTK class methods.
  vtkTypeRevisionMacro(vtkCameraRepresentation,vtkBorderRepresentation);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Specify the camera to interpolate. This must be specified by
  // the user.
  void SetCamera(vtkCamera *camera);
  vtkGetObjectMacro(Camera,vtkCamera);

  // Description:
  // Get the vtkCameraInterpolator used to interpolate and save the
  // sequence of camera views. If not defined, one is created
  // automatically. Note that you can access this object to set
  // the interpolation type (linear, spline) and other instance
  // variables.
  void SetInterpolator(vtkCameraInterpolator *camInt);
  vtkGetObjectMacro(Interpolator,vtkCameraInterpolator);
  
  // Description:
  // Set the number of frames to generate when playback is initiated.
  vtkSetClampMacro(NumberOfFrames,int,1,VTK_LARGE_INTEGER);
  vtkGetMacro(NumberOfFrames,int);

  // Description:
  // By obtaining this property you can specify the properties of the 
  // representation.
  vtkGetObjectMacro(Property,vtkProperty2D);

  // Description:
  // These methods are used to create interpolated camera paths.  The
  // AddCameraToPath() method adds the view defined by the current camera
  // (via SetCamera()) to the interpolated camera path. AnimatePath()
  // interpolates NumberOfFrames along the current path. InitializePath()
  // resets the interpolated path to its initial, empty configuration.
  void AddCameraToPath();
  void AnimatePath(vtkRenderWindowInteractor *rwi);
  void InitializePath();

  // Description:
  // Satisfy the superclasses' API.
  virtual void BuildRepresentation();
  virtual void GetSize(double size[2])
    {size[0]=6.0; size[1]=2.0;}
  
  // Description:
  // These methods are necessary to make this representation behave as
  // a vtkProp.
  virtual void GetActors2D(vtkPropCollection*);
  virtual void ReleaseGraphicsResources(vtkWindow*);
  virtual int RenderOverlay(vtkViewport*);
  virtual int RenderOpaqueGeometry(vtkViewport*);
  virtual int RenderTranslucentGeometry(vtkViewport*);

protected:
  vtkCameraRepresentation();
  ~vtkCameraRepresentation();

  // the camera and the interpolator
  vtkCamera             *Camera;
  vtkCameraInterpolator *Interpolator;
  int                   NumberOfFrames;
  double                CurrentTime;

  // representation of the camera
  vtkPoints                  *Points;
  vtkPolyData                *PolyData;
  vtkTransformPolyDataFilter *TransformFilter;
  vtkPolyDataMapper2D        *Mapper;
  vtkProperty2D              *Property;
  vtkActor2D                 *Actor;

private:
  vtkCameraRepresentation(const vtkCameraRepresentation&);  //Not implemented
  void operator=(const vtkCameraRepresentation&);  //Not implemented
};

#endif
