#ifndef MOM01D2_HH
#define MOM01D2_HH
///////////////////////////////////////////////////////////////////////////
//! file="amma/Image/Region/Mom01d2.hh"
//! lib=iaps
//! userlevel=Normal
//! author="Radek Marik"
//! docentry="Image.Image Processing.Region Model"
//! rcsid="$Id: Mom01d2.hh,v 1.8 1999/12/02 11:32:46 ees1cg Exp $"
//! date="06/08/95"

#include "amma/StdType.hh"

class ostream;
class istream;
class BoundaryC; 

// -----------------------------------------------------------------
// ***************  Moments01d2C ***********************************
// -----------------------------------------------------------------

//: The class Moments01d2C is the representation of the first 3 moments
//: (00, 01, 10) of a 2-dimensional object.

class Moments01d2C
{
  public:
    // Type definitions.
    // -----------------

    typedef LongIntT AreaT;
    // Area of a 2D object.

  public:

    // Constructors, copies, assigment, and destructor
    // -----------------------------------------------

    Moments01d2C(const BoundaryC & boundary);
    // get the center and the area of the region 
    // which is determined by the 'boundary'.

    // Access to the object model
    // --------------------------

    inline RealT M00() const;
    // Returns the moment m00.

    inline RealT M10() const;
    // Returns the moment m10.

    inline RealT M01() const;
    // Returns the moment m01.

    // Derived characteristics of the object
    // -------------------------------------

    inline AreaT Area() const;
    // Returns the moment m00, e.g. the area of the 2 dimensional object.

    inline RealT CentroidX() const;
    // Returns the x co-ordinate of the centroid. The M00 moment must
    // be different 0.

    inline RealT CentroidY() const;
    // Returns the y co-ordinate of the centroid. The M00 moment must
    // be different 0.

  private:

    // The representation of the object
    // --------------------------------

    RealT m00; // the momemt 00 (xy)
    RealT m01; // the moment 01 (xy)
    RealT m10; // the moment 10 (xy)

  friend istream & operator>>(istream & is, Moments01d2C & mom);
};

ostream &
operator<<(ostream & os, const  Moments01d2C & mom);

istream &
operator>>(istream & is, Moments01d2C & mom);

/*-------------------------------------------------------------------*/
/********* Moments01d2C **********************************************/
/*-------------------------------------------------------------------*/

inline 
Moments01d2C::AreaT 
Moments01d2C::Area() const
//========================
{
  return (AreaT)m00;
}

inline 
RealT  
Moments01d2C::M00() const
//=======================
{
  return m00;
}

inline 
RealT  
Moments01d2C::M10() const
//=======================
{
  return m10;
}

inline 
RealT  
Moments01d2C::M01() const
//=======================
{
  return m01;
}

inline 
RealT 
Moments01d2C::CentroidX() const
//=============================
{
  return M10()/M00();
}

inline 
RealT 
Moments01d2C::CentroidY() const
//=============================
{
  return M01()/M00();
}

#endif

// IAPS - Image analysis program system. 
// End of include file Mom01d2.hh