arc.h

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#ifndef ARC_H
#define ARC_H

#include <cassert>
#include <iostream>
#include <string>
#include <vector>
using namespace std;

#include <point.h>

#include <arcsdef.h>

class arc
{
  void angleAdjusted(double & angle) const;

  boolc isAntiClockwise2() const;
public:

  pt2 p0;
  pt2 p1;

  double radius;

  //
  //  Calculated variables from p0, p1 and radius.
  //
  double phi0;
  double phi1;
  pt2 center;

  arc();
  arc
  (
    doublec radius_,
    pt2c & p0_,
    pt2c & p1_
  );

  void constructRadiusTwoPoints
  (
    doublec radius_,
    pt2c & p0_,
    pt2c & p1_
  );
  
  void constructPhi0TwoPoints
  (
    doublec phi0_,
    pt2c & p0_,
    pt2c & p1_
  );

  boolc isAntiClockwise() const
    { return radius > 0.0; }

  boolc isStraightLine() const
    { return radius == 0.0; }
  
  boolc valid() const;
  /* Read in an arc from a stream. */
//  istream & serializeInverse(istream & istr)
//    { return istr >> p0 >> p1 >> radius; }

  operator string() const;

  void print() const;

  doublec length() const;

  static void arcreader
  (
    vector<arc> & v, 
    string const & filename
  );

  void distance( double & val, pt2c & p) const;
  void distanceSquared( double & val, pt2c & p) const;

  static double zero;

private:
  void calculateCenter();
};

ostream & operator << (ostream & os, arc const & a);



#endif