SundanceAToCDensitySampler.hpp

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//                              Sundance
//                 Copyright (2005) Sandia Corporation
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#ifndef SUNDANCE_ATOCDENSITYSAMPLER_H
#define SUNDANCE_ATOCDENSITYSAMPLER_H

#include "SundanceDefs.hpp"
#include "SundanceMesh.hpp"
#include "SundanceExpr.hpp"
#include "SundanceDiscreteFunction.hpp"
#include "SundanceDiscreteSpace.hpp"
#include "SundanceAToCPointLocator.hpp"

namespace Sundance
{
  using namespace Teuchos;
  using namespace Playa;

  /**
   * AToCDensitySampler samples a distribution of particles to compute a
   * density function on a discrete space. 
   *
   * Note: not tested in parallel.
   */
  class AToCDensitySampler
  {
  public:
    /** */
    AToCDensitySampler(const AToCPointLocator& locator,
                       const VectorType<double>& vecType);
    /** */
    AToCDensitySampler(const AToCPointLocator& locator,
                       const std::vector<double>& origin,
                       const std::vector<double>& rotationalAxis,
                       const VectorType<double>& vecType);

    /** */
    Expr sample(const std::vector<double>& positions,
                const double& particleWeight) const ;

    /** */
    Expr resetCounts() const ;

    /** */
    void addToCounts(const std::vector<double>& positions,
                     const double& particleWeight,
                     Expr density) const ;


  private:
    void init();
    Point vec2point(const std::vector<double>& x) const ;
    Point normPoint(const Point& x) const ;

    DiscreteSpace discSpace_;
    int dim_;
    Mesh mesh_;
    RCP<Array<int> > elemToVecIndexMap_;
    Expr elemWeights_;
    Vector<double> elemWeightVec_;
    AToCPointLocator locator_;
    bool isAxisymmetric_;
    Point origin_;
    Point axis_;
  };
}


#endif