dox/Filtering/vtkViewDependentErrorMetric.h

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

  Program:   Visualization Toolkit
  Module:    vtkViewDependentErrorMetric.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.

=========================================================================*/
#ifndef __vtkViewDependentErrorMetric_h
#define __vtkViewDependentErrorMetric_h

#include "vtkGenericSubdivisionErrorMetric.h"

class vtkViewport;
class vtkCoordinate;

class VTK_FILTERING_EXPORT vtkViewDependentErrorMetric : public vtkGenericSubdivisionErrorMetric
{
public:
  static vtkViewDependentErrorMetric *New();
  

  vtkTypeMacro(vtkViewDependentErrorMetric,vtkGenericSubdivisionErrorMetric);
  void PrintSelf(ostream& os, vtkIndent indent);
  

  vtkGetMacro(PixelTolerance, double);

  void SetPixelTolerance(double value);


  vtkGetObjectMacro(Viewport,vtkViewport);
  void SetViewport(vtkViewport *viewport);
  

  int RequiresEdgeSubdivision(double *leftPoint, double *midPoint, double *rightPoint,
                              double alpha);
  

  double GetError(double *leftPoint, double *midPoint,
                  double *rightPoint, double alpha);

protected:
  vtkViewDependentErrorMetric();
  ~vtkViewDependentErrorMetric();
  

  double Distance2LinePoint(double x[2],
                            double y[2],
                            double z[2]);
  
  double PixelTolerance;
  vtkViewport *Viewport;
  // used to get display coordinates from world coordinates
  vtkCoordinate *Coordinate; 
  
private:
  vtkViewDependentErrorMetric(const vtkViewDependentErrorMetric&);  // Not implemented.
  void operator=(const vtkViewDependentErrorMetric&);  // Not implemented.
};

#endif

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