---

Common/vtkPlane.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkPlane.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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 __vtkPlane_h
#define __vtkPlane_h

#include "vtkImplicitFunction.h"

class VTK_COMMON_EXPORT vtkPlane : public vtkImplicitFunction
{
public:
  static vtkPlane *New();

  vtkTypeRevisionMacro(vtkPlane,vtkImplicitFunction);
  void PrintSelf(ostream& os, vtkIndent indent);


  float EvaluateFunction(float x[3]);
  float EvaluateFunction(float x, float y, float z)
    {return this->vtkImplicitFunction::EvaluateFunction(x, y, z); } ;

  void EvaluateGradient(float x[3], float g[3]);


  vtkSetVector3Macro(Normal,float);
  vtkGetVectorMacro(Normal,float,3);


  vtkSetVector3Macro(Origin,float);
  vtkGetVectorMacro(Origin,float,3);

  void Push(float distance);


  static void ProjectPoint(float x[3], float origin[3], float normal[3], 
                           float xproj[3]);
  static void ProjectPoint(double x[3], double origin[3], double normal[3], 
                           double xproj[3]);


  static void GeneralizedProjectPoint(float x[3], float origin[3],
                                      float normal[3], float xproj[3]);
  

  static float Evaluate(float normal[3], float origin[3], float x[3]);
  static float Evaluate(double normal[3], double origin[3], double x[3]);

  static float DistanceToPlane(float x[3], float n[3], float p0[3]);
  

  static int IntersectWithLine(float p1[3], float p2[3], float n[3], 
                               float p0[3], float& t, float x[3]);


protected:
  vtkPlane();
  ~vtkPlane() {};

  float Normal[3];
  float Origin[3];

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

inline float vtkPlane::Evaluate(float normal[3], float origin[3], float x[3])
{
  return normal[0]*(x[0]-origin[0]) + normal[1]*(x[1]-origin[1]) + 
         normal[2]*(x[2]-origin[2]);
}
inline float vtkPlane::Evaluate(double normal[3], double origin[3],double x[3])
{
  return static_cast<float> (normal[0]*(x[0]-origin[0]) + normal[1]*(x[1]-origin[1]) + 
         normal[2]*(x[2]-origin[2]));
}

inline float vtkPlane::DistanceToPlane(float x[3], float n[3], float p0[3])
{
#define vtkPlaneAbs(x) ((x)<0?-(x):(x))
  return ((float) vtkPlaneAbs(n[0]*(x[0]-p0[0]) + n[1]*(x[1]-p0[1]) + 
                              n[2]*(x[2]-p0[2])));
}

#endif

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