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/*
$Id: vector2.h,v 1.6 2001/10/23 07:32:35 sphair Exp $
------------------------------------------------------------------------
ClanLib, the platform independent game SDK.
This library is distributed under the GNU LIBRARY GENERAL PUBLIC LICENSE
version 2. See COPYING for details.
For a total list of contributers see CREDITS.
------------------------------------------------------------------------
Credits for this class:
Magic Software - www.magic-software.com
*/
//! clanCore="Math"
//! header=core.h
#ifndef header_vector2d
#define header_vector2d
//: A 2D Vector class
//- CL_Vector2 provides a 2D vector class.
//- This is different from {link CL_Vector CL_Vector.html}
class CL_Vector2
{
public:
//! Construction:
//: Default constructor
CL_Vector2();
//: Constructor with info
//- fX - The X coordinate.
//- fY - The Y coordinate.
CL_Vector2(float fX, float fY);
//: FIXME!
CL_Vector2(float afCoordinate[2]);
//: Copy constructor
//- rkVector = Vector to copy
CL_Vector2(const CL_Vector2& rkVector);
//! Operators:
// access vector V as V[0] = V.x, V[1] = V.y
//
// WARNING. These member functions rely on
// (1) CL_Vector2 not having virtual functions
// (2) the data packed in a 2*sizeof(float) memory block
//: Accessor
//: Use vector V[0] for V.x
//: Use vector V[1] for V.y
//- Returns - The requested parameter
float& operator[] (int i) const;
//: Unknown
operator float* ();
//: assignment operator
CL_Vector2& operator= (const CL_Vector2& rkVector);
// comparison (supports fuzzy arithmetic when FUZZ > 0)
//: Equivalancy operator
//- Supports fuzzy arimatic when FUZZ > 0
bool operator== (const CL_Vector2& rkVector) const;
//: Not-equals operator
//- Supports fuzzy arimatic when FUZZ > 0
bool operator!= (const CL_Vector2& rkVector) const;
//: Less than operator
//- Supports fuzzy arimatic when FUZZ > 0
bool operator< (const CL_Vector2& rkVector) const;
//: Less than or equal operator
//- Supports fuzzy arimatic when FUZZ > 0
bool operator<= (const CL_Vector2& rkVector) const;
//: Greater than operator
//- Supports fuzzy arimatic when FUZZ > 0
bool operator> (const CL_Vector2& rkVector) const;
//: Greater than or equal operator
//- Supports fuzzy arimatic when FUZZ > 0
bool operator>= (const CL_Vector2& rkVector) const;
// arithmetic operations
//: Addition operator
CL_Vector2 operator+ (const CL_Vector2& rkVector) const;
//: Subtraction operator
CL_Vector2 operator- (const CL_Vector2& rkVector) const;
//: Multiplication operator
CL_Vector2 operator* (float fScalar) const;
//: Division operator
CL_Vector2 operator/ (float fScalar) const;
//: Negation operator
//- Return - The negative of the Vector
CL_Vector2 operator- () const;
// MAGICFM friend CL_Vector2 operator* (float fScalar, const CL_Vector2& rkVector);
// arithmetic updates
//: Addition assignment operator
CL_Vector2& operator+= (const CL_Vector2& rkVector);
//: Subtraction assignment operator
CL_Vector2& operator-= (const CL_Vector2& rkVector);
//: Multiplication assignment operator
CL_Vector2& operator*= (float fScalar);
//: Division assignment operator
CL_Vector2& operator/= (float fScalar);
//! Attributes:
//: Enable Fuzzy arithmatic
void set_fuzz() { FUZZ = 1.0; }
//: Disable Fuzzy arithmatic
void disable_fuzz() { FUZZ = 0.0; }
//: Using fuzzy arimatic
//- Returns - True if using fuzzy arithmatic
bool get_fuzz() { return (FUZZ > 0.0)? true : false ;}
// vector operations
//: The length of the vector
//- Return - sqrt(x^2+y^2)
float length() const;
//: The squared length of the vector
//- Returns - x^2+y^2
float squared_length() const;
//: FIXME!!!
float dot(const CL_Vector2& rkVector) const;
//: FIXME!!!
float unitize(float fTolerance = 1e-06f);
//: Cross
//- FIXME
//- Returns - Return y,-x
CL_Vector2 cross() const;
//: Unit Cross
//- Returns - (y,-x)/sqrt(x^2+y^2)
CL_Vector2 unit_cross() const;
// Gram-Schmidt orthonormalization.
// static void Orthonormalize (CL_Vector2 akVector[/*2*/]);
//! Variables:
// coordinates
float x, y;
// special points
static const CL_Vector2 ZERO;
static const CL_Vector2 UNIT_X;
static const CL_Vector2 UNIT_Y;
// fuzzy arithmetic (set FUZZ > 0 to enable)
static float FUZZ;
};
#include "vector2.inl"
#endif
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