dox/Graphics/vtkDijkstraGraphGeodesicPath.h

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

  Program:   Visualization Toolkit
  Module:    vtkDijkstraGraphGeodesicPath.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 __vtkDijkstraGraphGeodesicPath_h
#define __vtkDijkstraGraphGeodesicPath_h

#include "vtkGraphGeodesicPath.h"

class vtkDijkstraGraphInternals;
class vtkIdList;

class VTK_GRAPHICS_EXPORT vtkDijkstraGraphGeodesicPath :
                           public vtkGraphGeodesicPath
{
public:
  
  static vtkDijkstraGraphGeodesicPath *New();


  vtkTypeMacro(vtkDijkstraGraphGeodesicPath,vtkGraphGeodesicPath);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkGetObjectMacro(IdList, vtkIdList);
  

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

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


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


  virtual void SetRepelVertices(vtkPoints*);
  vtkGetObjectMacro(RepelVertices, vtkPoints);

  virtual double GetGeodesicLength() { return 0.0; }

  virtual void GetCumulativeWeights(vtkDoubleArray *weights);
  
protected:
  vtkDijkstraGraphGeodesicPath();
  ~vtkDijkstraGraphGeodesicPath();

  virtual int RequestData(vtkInformation *, vtkInformationVector **, 
                          vtkInformationVector *);

  // Build a graph description of the input.
  virtual void BuildAdjacency( vtkDataSet *inData );

  vtkTimeStamp AdjacencyBuildTime;
  
  // The fixed cost going from vertex u to v.
  virtual double CalculateStaticEdgeCost( vtkDataSet *inData, vtkIdType u, vtkIdType v);

  // The cost going from vertex u to v that may depend on one or more vertices
  //that precede u.
  virtual double CalculateDynamicEdgeCost( vtkDataSet *, vtkIdType , vtkIdType )
  { return 0.0; }

  void Initialize( vtkDataSet *inData );

  void Reset();

  // Calculate shortest path from vertex startv to vertex endv.
  virtual void ShortestPath( vtkDataSet *inData, int startv, int endv );
  
  // Relax edge u,v with weight w.
  void Relax(const int& u, const int& v, const double& w);

  // Backtrace the shortest path
  void TraceShortestPath( vtkDataSet* inData, vtkPolyData* outPoly,
               vtkIdType startv, vtkIdType endv);
  
  // The number of vertices.
  int NumberOfVertices;
  
  // The vertex ids on the shortest path.
  vtkIdList *IdList;
  
  //Internalized STL containers.
  vtkDijkstraGraphInternals *Internals;
  
  int StopWhenEndReached;
  int UseScalarWeights;
  int RepelPathFromVertices;

  vtkPoints* RepelVertices;

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

};

#endif

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