vector2.h

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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//

#ifndef BALL_MATHS_VECTOR2_H
#define BALL_MATHS_VECTOR2_H

#ifndef BALL_CONCEPT_PERSISTENCEMANAGER_H
# include <BALL/CONCEPT/persistenceManager.h>
#endif

#ifndef BALL_COMMON_EXCEPTION_H
# include <BALL/COMMON/exception.h>
#endif

#ifndef BALL_MATHS_COMMON_H
# include <BALL/MATHS/common.h>
#endif


namespace BALL 
{


  template <typename T>
  class TVector2;


  template <typename T>
  BALL_INLINE 
  TVector2<T> operator * (const T& scalar, const TVector2<T>& vector);

  template <typename T>
  std::istream& operator >> (std::istream& s, TVector2<T>& vector);

  /* Output stream.
  */
  template <typename T>
  std::ostream& operator << (std::ostream& s, const TVector2<T>& vector);
  

  template <typename T>
  class TVector2
    : public PersistentObject
  {
    public:

    BALL_CREATE(TVector2<T>)

    

    TVector2();

    explicit TVector2(const T& value);

    TVector2(const T& vx, const T& vy);

    TVector2(const TVector2& vector);

    TVector2(const T* ptr);


    virtual ~TVector2();

    virtual void clear();



    virtual void persistentWrite(PersistenceManager& pm,
        const char* name = 0) const;

    virtual void persistentRead(PersistenceManager& pm);



    void set(const T& value);

    void set(const T& vx, const T& vy);

    void set(const TVector2& vector);

    TVector2& operator = (const TVector2& v);

    TVector2& operator = (const T& value);

    TVector2& operator = (const T* ptr);

    T getLength() const;

    T getSquareLength() const;

    TVector2& normalize();

    TVector2& negate();

    static const TVector2& getZero();

    static const TVector2& getUnit();

    T& operator [] (Position position);

    const T& operator [] (Position position) const;



    const TVector2& operator + () const;

    TVector2 operator - () const;

    TVector2 operator + (const TVector2& b) const;

    TVector2 operator - (const TVector2& b) const;

    TVector2& operator += (const TVector2& vector);

    TVector2& operator -= (const TVector2& vector);

    TVector2 operator * (const T& scalar) const;

    TVector2& operator *= (const T& scalar);

    TVector2 operator / (const T& lambda) const;

    TVector2& operator /= (const T& lambda);

    T operator * (const TVector2& vector) const;



    T getDistance(const TVector2& vector) const;

    T getSquareDistance(const TVector2& vector) const;

  

    bool operator == (const TVector2& vector) const;
  
    bool operator != (const TVector2& vector) const;

    bool isZero() const;

    bool isOrthogonalTo(TVector2& vector) const;




    void dump(std::ostream& s = std::cout, Size depth = 0) const;

    bool isValid() const;



  
    T x;

    T y;


    private:

  };
  
  template <typename T>
  TVector2<T>::TVector2()
    
    : PersistentObject(),
      x(0),
      y(0)
  {
  }

  template <typename T>
  TVector2<T>::TVector2(const T& value)
    
    : PersistentObject(), 
      x(value),
      y(value)
  {
  }

  template <typename T>
  TVector2<T>::TVector2(const T& vx, const T& vy)
    
    : PersistentObject(),
      x(vx),
      y(vy)
  {
  }

  template <typename T>
  TVector2<T>::TVector2(const TVector2& vector)
    
    : PersistentObject(),
      x(vector.x),
      y(vector.y)
  {
  }

  template <typename T>
  TVector2<T>::~TVector2()
    
  {
  }

  template <typename T>
  BALL_INLINE
  TVector2<T>::TVector2(const T* ptr)
  {
    if (ptr == 0) 
    {
      throw Exception::NullPointer(__FILE__, __LINE__);
    }

    x = *ptr++;
    y = *ptr;
  }

  template <typename T>
  void TVector2<T>::clear()
    
  {
    x = y = (T)0;
  }

  template <typename T>
  void TVector2<T>::persistentWrite(PersistenceManager& pm, const char* name) const
  {
    pm.writeObjectHeader(this, name);
      pm.writePrimitive(x, "x");
      pm.writePrimitive(y, "y");
    pm.writeObjectTrailer(name);
  }

  template <typename T>
  void TVector2<T>::persistentRead(PersistenceManager& pm)
  {
    pm.readPrimitive(x, "x");
    pm.readPrimitive(y, "y");
  }
 
  template <typename T>
  BALL_INLINE 
  void TVector2<T>::set(const T& value)
    
  {
    x = value;
    y = value;
  }

  template <typename T>
  BALL_INLINE 
  void TVector2<T>::set(const T& vx, const T& vy)
    
  {
    x = vx;
    y = vy;
  }

  template <typename T>
  BALL_INLINE 
  void TVector2<T>::set(const TVector2<T>& vector)
    
  {
    x = vector.x;
    y = vector.y;
  }

  template <typename T>
  BALL_INLINE 
  TVector2<T>& TVector2<T>::operator = (const TVector2<T>& vector)
    
  {
    x = vector.x;
    y = vector.y;

    return *this;
  }

  template <typename T>
  BALL_INLINE 
  TVector2<T>& TVector2<T>::operator = (const T* ptr)
  {
    if (ptr == 0)
    {
      throw Exception::NullPointer(__FILE__, __LINE__);
    }
    x = *ptr++;;
    y = *ptr;;

    return *this;
  }

  template <typename T>
  BALL_INLINE
  TVector2<T>& TVector2<T>::operator = (const T& value)
  {
    x = value;
    y = value;

    return *this;
  }

  template <typename T>
  BALL_INLINE 
  T TVector2<T>::getLength() const
  {
    return (T)sqrt(x * x + y * y);
  }

  template <typename T>
  BALL_INLINE 
  T TVector2<T>::getSquareLength() const
  {
    return (T)(x * x + y * y);
  }

  template <typename T>
  TVector2<T>& TVector2<T>::normalize()
  {
    T len = (T)sqrt(x * x + y * y);

    if (Maths::isZero(len)) 
    {
      throw Exception::DivisionByZero(__FILE__, __LINE__);
    }
    
    x /= len;
    y /= len;

    return *this;
  }

  template <typename T>
  TVector2<T>& TVector2<T>::negate()
  {
    x *= -1;
    y *= -1;
    return *this;
  }

  template <typename T>
  BALL_INLINE 
  const TVector2<T>& TVector2<T>::getZero()
  {
    static TVector2<T> null_vector(0, 0);
    return null_vector;
  }

  template <typename T>
  BALL_INLINE 
  const TVector2<T>& TVector2<T>::getUnit()
  {
    static TVector2<T> unit_vector(1, 1);
    return unit_vector;
  }

  template <typename T>
  BALL_INLINE 
  T& TVector2<T>::operator [] (Position position)
  {
    if (position > 1)
    {
      throw Exception::IndexOverflow(__FILE__, __LINE__);
    }
    switch (position) 
    {
      case 0: return x;
      case 1:
      default:
        return y;
    }
  }

  template <typename T>
  BALL_INLINE 
  const T& TVector2<T>::operator [] (Position position) const
  {
    if (position > 1)
    {
      throw Exception::IndexOverflow(__FILE__, __LINE__);
    }
    switch (position) 
    {
      case 0: return x;
      case 1:
      default:
        return y;
    }
  }

  template <typename T>
  BALL_INLINE
  const TVector2<T>& TVector2<T>::operator + () const 
  {
    return *this;
  }

  template <typename T>
  BALL_INLINE
  TVector2<T> TVector2<T>::operator - () const  
  {
    return TVector2<T>(-x, -y);
  }

  template <typename T>
  BALL_INLINE 
  TVector2<T> TVector2<T>::operator + (const TVector2<T>& b) const
  {
    return TVector2<T>(x + b.x, y + b.y);
  }
  
  template <typename T>
  BALL_INLINE
  TVector2<T> TVector2<T>::operator - (const TVector2<T>& b) const
  {
    return TVector2<T>(x - b.x, y - b.y);
  }

  template <typename T>
  BALL_INLINE 
  TVector2<T>& TVector2<T>::operator += (const TVector2<T>& vector)
  {
    x += vector.x;
    y += vector.y;

    return *this;
  }

  template <typename T>
  BALL_INLINE 
  TVector2<T>& TVector2<T>::operator -= (const TVector2<T>& vector)
  {
    x -= vector.x;
    y -= vector.y;

    return *this;
  }

  template <typename T>
  BALL_INLINE 
  TVector2<T> TVector2<T>::operator * (const T& scalar) const 
  {
    return TVector2<T>(x * scalar, y * scalar);
  }

  template <typename T>
  BALL_INLINE 
  TVector2<T>& TVector2<T>::operator *= (const T &scalar)
  {
    x *= scalar;
    y *= scalar;

    return *this;
  }

  template <typename T>
  TVector2<T> TVector2<T>::operator / (const T& lambda) const
  {
    if (lambda == (T)0)
    {
      throw Exception::DivisionByZero(__FILE__, __LINE__);
    }
    return TVector2<T>(x / lambda, y / lambda);
  }

  template <typename T>
  TVector2<T>& TVector2<T>::operator /= (const T& lambda)
  {
    if (lambda == (T)0)
    {
      throw Exception::DivisionByZero(__FILE__, __LINE__);    
    }
    x /= lambda;
    y /= lambda;

    return *this;
  }

  template <typename T>
  BALL_INLINE 
  T TVector2<T>::operator * (const TVector2<T>& vector) const
  {
    return (x * vector.x + y * vector.y);
  }

  template <typename T>
  BALL_INLINE 
  T TVector2<T>::getDistance(const TVector2<T>& v) const
  {
    T dx = x - v.x;
    T dy = y - v.y;
    
    return (T)sqrt(dx * dx + dy * dy); 
  }

  template <typename T>
  BALL_INLINE 
  T TVector2<T>::getSquareDistance(const TVector2<T>& v) const
  {
    T dx = x - v.x;
    T dy = y - v.y;
    
    return (dx * dx + dy * dy); 
  }

  template <typename T>
  BALL_INLINE 
  bool TVector2<T>::operator == (const TVector2<T>& v) const
  {
    return (Maths::isEqual(x, v.x) && Maths::isEqual(y, v.y));
  }

  template <typename T>
  BALL_INLINE 
  bool TVector2<T>::operator != (const TVector2<T>& v) const
  {
    return (Maths::isNotEqual(x, v.x) || Maths::isNotEqual(y, v.y));
  }

  template <typename T>
  BALL_INLINE 
  bool TVector2<T>::isOrthogonalTo(TVector2<T>& v) const
  {
    return Maths::isZero((*this) * v);
  }

  template <typename T>
  BALL_INLINE 
  bool TVector2<T>::isValid() const
  {
    return true;
  }

  template <typename T>
  BALL_INLINE 
  bool TVector2<T>::isZero() const
  {
    return (Maths::isZero(x) && Maths::isZero(y));
  }

  template <typename T>
  void TVector2<T>::dump(std::ostream& s, Size depth) const
  {
    BALL_DUMP_STREAM_PREFIX(s);

    BALL_DUMP_HEADER(s, this, this);

    BALL_DUMP_DEPTH(s, depth);
    s << "  (x =  " << x << ", y = " << y << ")" << std::endl;

    BALL_DUMP_STREAM_SUFFIX(s);
  }

  typedef TVector2<float> Vector2;

  template <typename T>
  BALL_INLINE 
  TVector2<T> operator * (const T& scalar, const TVector2<T>& vector)
  {
    return TVector2<T>(scalar * vector.x, scalar * vector.y);
  }

  template <typename T>
  std::istream& operator >> (std::istream& s, TVector2<T>& v)
  {
    char c;
    s >> c >> v.x >> v.y >> c;

    return s;
  }

  template <typename T>
  std::ostream& operator << (std::ostream& s, const TVector2<T>& v)
  {
    s << "(" << v.x << ' ' << v.y << ')';

    return s;
  }

}// namespace BALL

#endif // BALL_MATHS_VECTOR2_H

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