/*
 This file is part of the VRender library.
 Copyright (C) 2005 Cyril Soler (Cyril.Soler@imag.fr)
 Version 1.0.0, released on June 27, 2005.

 http://artis.imag.fr/Members/Cyril.Soler/VRender

 VRender is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 VRender is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with VRender; if not, write to the Free Software Foundation, Inc.,
 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

/****************************************************************************

 Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.

 This file is part of the QGLViewer library version 2.3.4.

 http://www.libqglviewer.com - contact@libqglviewer.com

 This file may be used under the terms of the GNU General Public License 
 versions 2.0 or 3.0 as published by the Free Software Foundation and
 appearing in the LICENSE file included in the packaging of this file.
 In addition, as a special exception, Gilles Debunne gives you certain 
 additional rights, described in the file GPL_EXCEPTION in this package.

 libQGLViewer uses dual licensing. Commercial/proprietary software must
 purchase a libQGLViewer Commercial License.

 This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

*****************************************************************************/

#ifndef _VRENDER_VECTOR2_H
#define _VRENDER_VECTOR2_H

#include <stdexcept>
#include <iostream>

namespace vrender
{
  class Vector3;

  class Vector2
	{
		public:
			// ---------------------------------------------------------------------------
			//! @name Constant
			//@{
			static const Vector2 inf;
			//@}

			// ---------------------------------------------------------------------------
			//! @name Constructor(s) and destructor
			//@{
			Vector2 ();
			~Vector2 ();
			Vector2 (const Vector2&);
			Vector2 (const Vector3& u);
			Vector2 (double,double);
			//@}

			// ---------------------------------------------------------------------------
			//! @name Access methods
			//@{
			inline double  x() const { return _xyz[0]; }
			inline double  y() const { return _xyz[1]; }
			inline void  setX(double r) { _xyz[0] = r; }
			inline void  setY(double r) { _xyz[1] = r; }
			inline void  setXY (double x,double y) { _xyz[0] = x; _xyz[1] = y; }
			//@}

			// ---------------------------------------------------------------------------
			//! @name Assignment
			//@{
			inline Vector2& operator= (const Vector2& u)  { _xyz[0] = u._xyz[0]; _xyz[1] = u._xyz[1]; return *this; }
			//@}

			// ---------------------------------------------------------------------------
			//! @name Comparisons
			//@{
			friend bool operator== (const Vector2&,const Vector2&);
			friend bool operator!= (const Vector2&,const Vector2&);
			//@}

			// ---------------------------------------------------------------------------
			//! @name Algebraic operations
			//@{
			inline Vector2& operator+= (const Vector2& v)
			{
				_xyz[0] += v._xyz[0];
				_xyz[1] += v._xyz[1];
				return *this;
			}

			inline Vector2& operator-= (const Vector2& v)
			{
				_xyz[0] -= v._xyz[0];
				_xyz[1] -= v._xyz[1];
				return *this;
			}

			inline Vector2& operator*= (double f) { _xyz[0] *= f; _xyz[1] *= f; return *this;}
			inline Vector2& operator/= (double f) { _xyz[0] /= f; _xyz[1] /= f; return *this;}

			friend Vector2 operator- (const Vector2&);
			static Vector2 mini(const Vector2&,const Vector2&) ;
			static Vector2 maxi(const Vector2&,const Vector2&) ;

			inline Vector2 operator+(const Vector2& u) const
			{
				return Vector2(_xyz[0]+u._xyz[0],_xyz[1]+u._xyz[1]);
			}
			inline Vector2 operator-(const Vector2& u) const
			{
				return Vector2(_xyz[0]-u._xyz[0],_xyz[1]-u._xyz[1]);
			}

			inline double    operator*(const Vector2& u) const
			{
				return _xyz[0]*u._xyz[0] + _xyz[1]*u._xyz[1] ;
			}

			inline double operator^(const Vector2& v) const
			{
				return _xyz[0]*v._xyz[1] - _xyz[1]*v._xyz[0] ;
			}

			Vector2 operator/ (double v) { return Vector2(_xyz[0]/v,_xyz[1]/v); }
			Vector2 operator* (double v) { return Vector2(_xyz[0]*v,_xyz[1]*v); }

			friend Vector2 operator* (double,const Vector2&);
			//@}

			// ---------------------------------------------------------------------------
			//! @name Metrics
			//@{
			double norm       () const;
			double squareNorm () const;
			double infNorm    () const; /// Should be used for most comparisons, for efficiency reasons.
			//@}
			// ---------------------------------------------------------------------------
			//! @name Stream overrides
			//@{
			friend std::ostream& operator<< (std::ostream&,const Vector2&);
			//@}

			double  operator[] (int i) const
			{
				if((i < 0)||(i > 1))
					throw std::runtime_error("Out of bounds in Vector2::operator[]") ;

				return _xyz[i];
			}

			double& operator[] (int i)
			{
				if((i < 0)||(i > 1))
					throw std::runtime_error("Out of bounds in Vector2::operator[]") ;

				return _xyz[i];
			}

		private:
			double _xyz[2];  //!< The 3 vector components

	}; // interface of Vector2
}

#endif // _VECTOR2_H
