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

  Program:   Visualization Toolkit
  Module:    vtkPointLoad.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/
// .NAME vtkPointLoad - compute stress tensors given point load on semi-infinite domain
// .SECTION Description
// vtkPointLoad is a source object that computes stress tensors on a volume. 
// The tensors are computed from the application of a point load on a 
// semi-infinite domain. (The analytical results are adapted from Saada - see 
// text.) It also is possible to compute effective stress scalars if desired.
// This object serves as a specialized data generator for some of the examples
// in the text.

// .SECTION See Also
// vtkTensorGlyph, vtkHyperStreamline

#ifndef __vtkPointLoad_h
#define __vtkPointLoad_h

#include "vtkStructuredPointsSource.h"

class VTK_EXPORT vtkPointLoad :  public vtkStructuredPointsSource
{
public:
  vtkTypeMacro(vtkPointLoad,vtkStructuredPointsSource);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Construct with ModelBounds=(-1,1,-1,1,-1,1), SampleDimensions=(50,50,50),
  // and LoadValue = 1.
  static vtkPointLoad *New();

  // Description:
  // Set/Get value of applied load.
  vtkSetMacro(LoadValue,float);
  vtkGetMacro(LoadValue,float);

  // Description:
  // Specify the dimensions of the volume. A stress tensor will be computed for
  // each point in the volume.
  void SetSampleDimensions(int i, int j, int k);

  // Description:
  // Specify the dimensions of the volume. A stress tensor will be computed for
  // each point in the volume.
  void SetSampleDimensions(int dim[3]);
  vtkGetVectorMacro(SampleDimensions,int,3);

  // Description:
  // Specify the region in space over which the tensors are computed. The point
  // load is assumed to be applied at top center of the volume.
  vtkSetVector6Macro(ModelBounds,float);
  vtkGetVectorMacro(ModelBounds,float,6);

  // Description:
  // Set/Get Poisson's ratio.
  vtkSetMacro(PoissonsRatio,float);
  vtkGetMacro(PoissonsRatio,float);

  // Description:
  // Turn on/off computation of effective stress scalar.
  vtkSetMacro(ComputeEffectiveStress,int);
  vtkGetMacro(ComputeEffectiveStress,int);
  vtkBooleanMacro(ComputeEffectiveStress,int);

protected:
  vtkPointLoad();
  ~vtkPointLoad() {};
  vtkPointLoad(const vtkPointLoad&) {};
  void operator=(const vtkPointLoad&) {};

  void Execute();

  float LoadValue;
  float PoissonsRatio;
  int SampleDimensions[3];
  float ModelBounds[6];
  int ComputeEffectiveStress;

};

#endif


