SundanceCurveNormExpr.hpp

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#ifndef SUNDANCE_CURVENORMEXPR_H
#define SUNDANCE_CURVENORMEXPR_H

#include "SundanceEvaluatorFactory.hpp"
#include "SundanceCurveNormEvaluator.hpp"

namespace Sundance
{
  using namespace Sundance;

  /** 
   * CurveNormExpr is an
   * expression that returns the Cartesian coordinate component
   * of the normal vector. Which dimensional component will be returned
   * can be specified in the constructor argument. <br>
   * The normal vector of the curve is always pointing outwards. This
   * outwards direction is in terms of the parameterized curve equation
   * from positive values to negative values.
   */
  class CurveNormExpr : public EvaluatableExpr,
                        public GenericEvaluatorFactory<CurveNormExpr, CurveNormEvaluator>
    {
    public:
      /** */
    CurveNormExpr(int dir, const std::string& name="");

      /** */
      virtual ~CurveNormExpr() {;}

      /** */
      virtual XMLObject toXML() const ;

      /** */
      int dir() const {return dir_;}

      /** */
      const std::string& name() const {return name_;}

      /** Write a simple text description suitable 
       * for output to a terminal */
      virtual std::ostream& toText(std::ostream& os, bool paren) const 
        {os<<name(); return os;}
      
      /** */
      virtual Set<MultipleDeriv> 
      internalFindW(int order, const EvalContext& context) const ;
      
      /* we use the default implementation from the supper class */
      //virtual Set<MultipleDeriv>
      //internalFindC(int order, const EvalContext& context) const ;
      
      /*  we use the default implementation from the supper class */
      //virtual Set<MultipleDeriv>
      //internalFindV(int order, const EvalContext& context) const ;
      
      /** */
      virtual RCP<ExprBase> getRcp() {return rcp(this);}

      /** Ordering operator for use in transforming exprs to standard form */
      virtual bool lessThan(const ScalarExpr* other) const ;

      static std::string coordName(int dir, const std::string& name);

    private:
      int dir_;
      std::string name_;
    };
}

#endif