// VTR.H
#ifndef VTR_H
#define VTR_H

#include "dgtd-performance.hpp"

class vtr {
  friend fp_t dotP(vtr, vtr);
  friend fp_t Length(vtr);
  friend fp_t Determinant(vtr, vtr, vtr);
  
 private:
  fp_t x, y, z;

 public:
  // constructor
  explicit vtr (fp_t =0.0, fp_t =0.0, fp_t =0.0);
  
  // operators
  vtr operator+(const vtr &) const;
  vtr operator-(const vtr &) const;
  vtr operator*(const vtr &) const;
  vtr operator*(const fp_t &) const;
  vtr operator/(const fp_t &) const;
  int operator==(const vtr &) const;
  int operator!=(const vtr &) const;
  int operator>(const vtr &) const;
  int operator<(const vtr &) const;
  vtr& operator=(const vtr &);

  // set functions
  void setvtr(fp_t, fp_t, fp_t);
  void reset();
  void unitvtr();
  void addvtr(fp_t = 0.0, fp_t = 0.0, fp_t = 0.0);
  void subvtr(fp_t = 0.0, fp_t = 0.0, fp_t = 0.0);
  void Scale(fp_t = 1.0);
  void negate();

  // get functions
  fp_t getx() const;
  fp_t gety() const;
  fp_t getz() const;
  fp_t magnitude();
  fp_t magSquare();

  // print
  void print();
};

// added by MV 05/27/03
fp_t findArea( vtr *ndArray, int ndNum );
fp_t triArea( vtr nd0, vtr nd1, vtr nd2 );

#endif