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 "vtkRenderingCoreModule.h" // For export macro
#include "vtkGenericSubdivisionErrorMetric.h"

class vtkViewport;
class vtkCoordinate;

class VTKRENDERINGCORE_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&) VTK_DELETE_FUNCTION;
  void operator=(const vtkViewDependentErrorMetric&) VTK_DELETE_FUNCTION;
};

#endif