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/* ------------------------------------------------------------------------
* $Id: Vector2D.hh,v 1.1 2001/06/15 14:42:04 elm Exp $
*
* This file is part of 3Dwm: The Three-Dimensional User Environment.
*
* 3Dwm: The Three-Dimensional User Environment:
* <http://www.3dwm.org>
*
* Chalmers Medialab
* <http://www.medialab.chalmers.se>
*
* ------------------------------------------------------------------------
* File created 2001-06-15 by Niklas Elmqvist.
*
* Copyright (c) 2001 Niklas Elmqvist <elm@3dwm.org>.
* ------------------------------------------------------------------------
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
* ------------------------------------------------------------------------
*/
#ifndef _Vector2D_hh_
#define _Vector2D_hh_
// -- System Includes
#include <iostream>
// -- Class Declarations
/**
* Two-dimensional vector class.
**/
class Vector2D {
public:
/**
* Default constructor.
**/
Vector2D(float x = 0., float y = 0.);
/**
* Constructor.
**/
Vector2D(const float c[2]);
/**
* Copy constructor.
**/
Vector2D(const Vector2D &v);
/**
* Destructor.
**/
~Vector2D() { }
/**
* Access operator (indexing).
**/
float &operator () (int n) { return _coord[n]; }
/**
* Access operator (indexing). Read-only.
**/
float operator () (int n) const { return _coord[n]; }
float x() const { return _coord[0]; }
float y() const { return _coord[1]; }
float &x() { return _coord[0]; }
float &y() { return _coord[1]; }
/**
* Vector addition assignment.
**/
Vector2D &operator += (const Vector2D &v);
/**
* Vector subtraction assignment.
**/
Vector2D &operator -= (const Vector2D &v);
/**
* Vector element-wise addition.
**/
Vector2D operator + (const Vector2D &v) const;
/**
* Vector element-wise subtraction.
**/
Vector2D operator - (const Vector2D &v) const;
/**
* Vector element-wise division.
**/
Vector2D operator / (const Vector2D &v) const;
/**
* Vector element-wise multiplication.
**/
Vector2D operator * (const Vector2D &v) const;
/**
* Scalar addition assignment.
**/
Vector2D &operator += (float f);
/**
* Scalar addition assignment.
**/
Vector2D &operator -= (float f);
/**
* Scalar subtraction assignment.
**/
Vector2D &operator /= (float f);
/**
* Scalar multiplication assignment.
**/
Vector2D &operator *= (float f);
/**
* Scalar addition.
**/
Vector2D operator + (const float f) const;
/**
* Scalar subtraction.
**/
Vector2D operator - (const float f) const;
/**
* Scalar division.
**/
Vector2D operator / (const float f) const;
/**
* Scalar multiplication.
**/
Vector2D operator * (const float f) const;
/**
* Unary negation.
**/
Vector2D operator - () const;
/**
* Assignment operator.
**/
Vector2D &operator = (const Vector2D &v);
/**
* Compute magnitude of vector.
**/
float magnitude();
/**
* Normalize vector (make the vector unit-length).
**/
void normalize();
/**
* Clear the vector (set it to [x y] = [0 0]).
**/
void clear();
/**
* Zero the vector (same as clear, set it to [0 0]).
**/
void zero();
/**
* Vector output operator.
**/
friend std::ostream & operator << (std::ostream &f, const Vector2D &v);
/**
* Compute the (vector) dot product.
*
* @param a first vector.
* @param b second vector.
* @return the dot product of the two vectors.
**/
static float dot(const Vector2D &a, const Vector2D &b);
private:
/// Vector coordinates array
float _coord[2];
};
/**
* Vector equality operator.
*
* @param a first vector.
* @param b second vector.
* @return true if the vectors are equal.
**/
bool operator == (const Vector2D &a, const Vector2D &b);
/**
* Scalar vector multiplication.
**/
inline Vector2D operator * (float f, Vector2D v) {
return v * f;
}
#endif /* Vector2D.hh */
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