coordinate.h

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#ifndef KIG_MISC_COORDINATE_H
#define KIG_MISC_COORDINATE_H

class QPoint;
class QDebug;

class Coordinate
{
public:
  static Coordinate fromQPoint( const QPoint& p );

  Coordinate( double x, double y );
  Coordinate( const Coordinate& p );
  Coordinate();
  ~Coordinate() {}

  static Coordinate invalidCoord();
  bool valid() const;

  double distance ( const Coordinate& p ) const;
  double length () const;
  inline double squareLength() const;
  const Coordinate operator- () const;
  const Coordinate orthogonal() const;
  const Coordinate round() const;
  const Coordinate normalize( double length = 1 ) const;
  QPoint toQPoint() const;

  Coordinate& operator= ( const Coordinate& c );
  Coordinate& operator+= ( const Coordinate& c );
  Coordinate& operator-= ( const Coordinate& c );
  Coordinate& operator*= ( double r );
  Coordinate& operator*= ( int r );
  Coordinate& operator/= ( double r );
public:
  double x;
  double y;

  friend QDebug& operator<<( QDebug& s, const Coordinate& t );
  friend const Coordinate operator+ ( const Coordinate& a, const Coordinate& b );
  friend const Coordinate operator- ( const Coordinate& a, const Coordinate& b );
  friend const Coordinate operator* ( const Coordinate& a, double r );
  friend const Coordinate operator/ ( const Coordinate& a, double r );
  friend double operator*( const Coordinate& a, const Coordinate& b );
  friend bool operator==( const Coordinate&, const Coordinate& );
  friend bool operator!=( const Coordinate&, const Coordinate& );
};

const Coordinate operator/ ( const Coordinate& a, double r );
QDebug& operator<<( QDebug& s, const Coordinate& t );
const Coordinate operator+ ( const Coordinate& a, const Coordinate& b );
const Coordinate operator- ( const Coordinate& a, const Coordinate& b );
const Coordinate operator* ( const Coordinate& a, double r );
const Coordinate operator* ( double r, const Coordinate& a );
double operator*( const Coordinate& a, const Coordinate& b );

double Coordinate::squareLength() const
{
  return x*x+y*y;
}

#endif