dox/Rendering/vtkInteractorStyleUnicam.h

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

  Program:   Visualization Toolkit
  Module:    vtkInteractorStyleUnicam.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.

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

/*
 * This work (vtkInteractorStyleUnicam.h) was produced under a grant from
 * the Department of Energy to Brown University.  Neither Brown University
 * nor the authors assert any copyright with respect to this work and it may
 * be used, reproduced, and distributed without permission.  
 */

#ifndef __vtkInteractorStyleUnicam_h
#define __vtkInteractorStyleUnicam_h

#include "vtkInteractorStyle.h"

class vtkCamera;
class vtkWorldPointPicker;

// 
// XXX - would have preferred to make these enumerations within the class,
//    enum { NONE=0, BUTTON_LEFT, BUTTON_MIDDLE, BUTTON_RIGHT };
//    enum {CAM_INT_ROT, CAM_INT_CHOOSE, CAM_INT_PAN, CAM_INT_DOLLY};
// but vtkWrapTcl signaled a "syntax error" when it parsed the 'enum' line.
// So, am making them defines which is what the other classes that want
// to have constants appear to do.
// 
// buttons pressed
#define VTK_UNICAM_NONE           0
#define VTK_UNICAM_BUTTON_LEFT    1
#define VTK_UNICAM_BUTTON_MIDDLE  2
#define VTK_UNICAM_BUTTON_RIGHT   3
// 
// camera modes
#define VTK_UNICAM_CAM_INT_ROT    0
#define VTK_UNICAM_CAM_INT_CHOOSE 1
#define VTK_UNICAM_CAM_INT_PAN    2
#define VTK_UNICAM_CAM_INT_DOLLY  3

class VTK_RENDERING_EXPORT vtkInteractorStyleUnicam : public vtkInteractorStyle 
{
public:
  static vtkInteractorStyleUnicam *New();
  vtkTypeMacro(vtkInteractorStyleUnicam,vtkInteractorStyle);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  void SetWorldUpVector(double a[3]) {this->SetWorldUpVector(a[0],a[1],a[2]);}
  void SetWorldUpVector(double x, double y, double z);
  vtkGetVectorMacro(WorldUpVector, double, 3);


  virtual void OnMouseMove();
  virtual void OnLeftButtonDown();
  virtual void OnLeftButtonUp();
  virtual void OnLeftButtonMove();

  virtual void OnTimer();

protected:
  vtkInteractorStyleUnicam();
  virtual ~vtkInteractorStyleUnicam();

  vtkWorldPointPicker *InteractionPicker;
  
  int      ButtonDown;   // which button is down
  double   DTime;        // time mouse button was pressed
  double   Dist;         // distance the mouse has moved since button press
  double    StartPix[2]; // pixel mouse movement started at
  double    LastPos[2];  // normalized position of mouse last frame
  double    LastPix[2];  // pixel position of mouse last frame
  double    DownPt[3];   // 3D point under cursor when mouse button pressed
  double    Center [3];   // center of camera rotation

  double    WorldUpVector[3]; // what the world thinks the 'up' vector is

  vtkActor    *FocusSphere; // geometry for indicating center of rotation
  int          IsDot;       // flag-- is the FocusSphere being displayed?
  vtkRenderer *FocusSphereRenderer;  // renderer for 'FocusSphere'

  int state;                 // which navigation mode was selected?

  void ChooseXY( int X, int Y );  // method for choosing type of navigation
  void RotateXY( int X, int Y );  // method for rotating
  void DollyXY( int X, int Y );  // method for dollying
  void PanXY( int X, int Y );  // method for panning

  // conveinence methods for translating & rotating the camera
  void  MyTranslateCamera(double v[3]);
  void  MyRotateCamera(double cx, double cy, double cz,
                       double ax, double ay, double az,
                       double angle);

  // Given a 3D point & a vtkCamera, compute the vectors that extend
  // from the projection of the center of projection to the center of
  // the right-edge and the center of the top-edge onto the plane
  // containing the 3D point & with normal parallel to the camera's
  // projection plane.
  void  GetRightVandUpV(double *p, vtkCamera *cam,
                        double *rightV, double *upV);

  // takes in pixels, returns normalized window coordinates
  void  NormalizeMouseXY(int X, int Y, double *NX, double *NY);

  // return the aspect ratio of the current window
  double WindowAspect();
private:
  vtkInteractorStyleUnicam(const vtkInteractorStyleUnicam&);  // Not implemented.
  void operator=(const vtkInteractorStyleUnicam&);  // Not implemented.
};

#endif  // __vtkInteractorStyleUnicam_h

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