#ifndef FILE_CURVE2D
#define FILE_CURVE2D

/**************************************************************************/
/* File:   curve2d.hh                                                     */
/* Author: Joachim Schoeberl                                              */
/* Date:   24. Jul. 96                                                    */
/**************************************************************************/

namespace netgen
{


  /*

  2D Curve repesentation

  */



  ///
  class Curve2d : public Manifold
  {
  public:
    ///
    virtual void Project (Point<2> & p) const = 0;
    ///
    virtual void NormalVector (const Point<2> & p, Vec<2> & n) const = 0;
  };
  
  ///
  class CircleCurve2d : public Curve2d
  {
    ///
    Point<2> center;
    ///
    double rad;
  public:
    ///
    CircleCurve2d (const Point<2> & acenter, double arad);
    ///
    virtual void Project (Point<2> & p) const;
    ///
    virtual void NormalVector (const Point<2> & p, Vec<2> & n) const;
  };
  
  ///
  class QuadraticCurve2d : public Curve2d
  {
    ///
    double cxx, cyy, cxy, cx, cy, c;
  public:
    ///
    QuadraticCurve2d ();
    ///
    void Read (istream & ist);
    ///
    virtual void Project (Point<2> & p) const;
    ///
    virtual void NormalVector (const Point<2> & p, Vec<2> & n) const;
  };


}

#endif