vtkAxisFollower.h

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

  Program:   Visualization Toolkit
  Module:    vtkAxisFollower.cxx

  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.

=========================================================================*/
#ifndef vtkAxisFollower_h
#define vtkAxisFollower_h

#include "vtkRenderingAnnotationModule.h" // For export macro
#include "vtkFollower.h"

#include "vtkWeakPointer.h" // For vtkWeakPointer

// Forward declarations.
class vtkAxisActor;
class vtkRenderer;

class VTKRENDERINGANNOTATION_EXPORT vtkAxisFollower : public vtkFollower
{
public:
 vtkTypeMacro(vtkAxisFollower,vtkFollower);
 virtual void PrintSelf(ostream& os, vtkIndent indent);

 static vtkAxisFollower *New();


 virtual void SetAxis(vtkAxisActor*);
 virtual vtkAxisActor* GetAxis();


 vtkSetMacro(AutoCenter, int);
 vtkGetMacro(AutoCenter, int);
 vtkBooleanMacro(AutoCenter, int);


 vtkSetMacro(EnableDistanceLOD, int);
 vtkGetMacro(EnableDistanceLOD, int);


 vtkSetClampMacro(DistanceLODThreshold, double, 0.0, 1.0);
 vtkGetMacro(DistanceLODThreshold, double);


 vtkSetMacro(EnableViewAngleLOD, int);
 vtkGetMacro(EnableViewAngleLOD, int);


 vtkSetClampMacro(ViewAngleLODThreshold, double, 0.0, 1.0);
 vtkGetMacro(ViewAngleLODThreshold, double);


 vtkSetMacro(ScreenOffset, double);
 vtkGetMacro(ScreenOffset, double);


 virtual int RenderOpaqueGeometry(vtkViewport *viewport);
 virtual int RenderTranslucentPolygonalGeometry(vtkViewport *viewport);
 virtual void Render(vtkRenderer *ren);

 virtual void ComputeTransformMatrix(vtkRenderer *ren);

 void ShallowCopy(vtkProp *prop);


 static double AutoScale(vtkViewport *viewport, vtkCamera * camera,
                         double screenSize, double position[3]);

protected:
 vtkAxisFollower();
 ~vtkAxisFollower();

 void CalculateOrthogonalVectors(double Rx[3], double Ry[3], double Rz[3],
                                 vtkAxisActor *axis1, double *dop,
                                 vtkRenderer *ren);


 void ComputeRotationAndTranlation(vtkRenderer *ren, double translation[3],
                                   double Rx[3], double Ry[3], double Rz[3],
                                   vtkAxisActor *axis);

 // \NOTE: Not used as of now.
 void ComputerAutoCenterTranslation(const double& autoScaleFactor,
                                    double translation[3]);


 int  TestDistanceVisibility();
 void ExecuteViewAngleVisibility(double normal[3]);

 bool IsTextUpsideDown(double* a, double* b);

 int          AutoCenter;

 int          EnableDistanceLOD;
 double       DistanceLODThreshold;

 int          EnableViewAngleLOD;
 double       ViewAngleLODThreshold;

 double       ScreenOffset;

 vtkWeakPointer<vtkAxisActor> Axis;


private:

 int TextUpsideDown;
 int VisibleAtCurrentViewAngle;

 vtkAxisFollower(const vtkAxisFollower&);  // Not implemented.
 void operator =(const vtkAxisFollower&);  // Not implemented.

 // hide the two parameter Render() method from the user and the compiler.
 virtual void Render(vtkRenderer *, vtkMapper *) {}

 //Internal matrices to avoid New/Delete for performance reasons
 vtkMatrix4x4 *InternalMatrix;

};

#endif // vtkAxisFollower_h