dox/Rendering/vtkLight.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkLight.h,v $

  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 __vtkLight_h
#define __vtkLight_h

#include "vtkObject.h"

/* need for virtual function */
class vtkRenderer;
class vtkMatrix4x4;

#define VTK_LIGHT_TYPE_HEADLIGHT    1
#define VTK_LIGHT_TYPE_CAMERA_LIGHT 2
#define VTK_LIGHT_TYPE_SCENE_LIGHT  3

class VTK_RENDERING_EXPORT vtkLight : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkLight,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkLight *New();

  virtual void Render(vtkRenderer *, int) {};


  vtkSetVector3Macro(AmbientColor,double);
  vtkGetVectorMacro(AmbientColor,double,3);
  vtkSetVector3Macro(DiffuseColor,double);
  vtkGetVectorMacro(DiffuseColor,double,3);
  vtkSetVector3Macro(SpecularColor,double);
  vtkGetVectorMacro(SpecularColor,double,3);
  void SetColor(double, double, double); 
  void SetColor(double a[3]) { this->SetColor(a[0], a[1], a[2]); }
  void GetColor(double rgb[3]);
  double *GetColor();


  vtkSetVector3Macro(Position,double);
  vtkGetVectorMacro(Position,double,3);
  void SetPosition(float *a) {this->SetPosition(a[0],a[1],a[2]);};
  

  vtkSetVector3Macro(FocalPoint,double);
  vtkGetVectorMacro(FocalPoint,double,3);
  void SetFocalPoint(float *a) {this->SetFocalPoint(a[0],a[1],a[2]);};


  vtkSetMacro(Intensity,double);
  vtkGetMacro(Intensity,double);


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


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


  vtkSetClampMacro(Exponent,double,0.0,128.0);
  vtkGetMacro(Exponent,double);


  vtkSetMacro(ConeAngle,double);
  vtkGetMacro(ConeAngle,double);


  vtkSetVector3Macro(AttenuationValues,double);
  vtkGetVectorMacro(AttenuationValues,double,3);


  virtual void SetTransformMatrix(vtkMatrix4x4*);
  vtkGetObjectMacro(TransformMatrix,vtkMatrix4x4);


  void GetTransformedPosition(double &a0, double &a1, double &a2);
  void GetTransformedPosition(double a[3]);
  double *GetTransformedPosition();


  void GetTransformedFocalPoint(double &a0, double &a1, double &a2);
  void GetTransformedFocalPoint(double a[3]);
  double *GetTransformedFocalPoint();


  void SetDirectionAngle(double elevation, double azimuth);
  void SetDirectionAngle(double ang[2]) { 
    this->SetDirectionAngle(ang[0], ang[1]); };

  void DeepCopy(vtkLight *light);


  vtkSetMacro(LightType, int);
  vtkGetMacro(LightType, int);
  void SetLightTypeToHeadlight()
    {this->SetLightType(VTK_LIGHT_TYPE_HEADLIGHT);}
  void SetLightTypeToSceneLight()
    {
    this->SetTransformMatrix(NULL);
    this->SetLightType(VTK_LIGHT_TYPE_SCENE_LIGHT);
    }
  void SetLightTypeToCameraLight()
    {this->SetLightType(VTK_LIGHT_TYPE_CAMERA_LIGHT);}


  int LightTypeIsHeadlight();
  int LightTypeIsSceneLight();
  int LightTypeIsCameraLight();

  void ReadSelf(istream& is);
  void WriteSelf(ostream& os);
  
protected:
  vtkLight();
  ~vtkLight();

  double FocalPoint[3];
  double Position[3];
  double Intensity;
  double AmbientColor[3];
  double DiffuseColor[3];
  double SpecularColor[3];
  int    Switch;
  int    Positional;
  double Exponent;
  double ConeAngle;
  double AttenuationValues[3];
  vtkMatrix4x4 *TransformMatrix;
  double TransformedFocalPointReturn[3];
  double TransformedPositionReturn[3];
  int    LightType;

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

#endif

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