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/*
** ClanLib SDK
** Copyright (c) 1997-2005 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** Magic Software - www.magic-software.com
*/
//! clanCore="Math"
//! header=core.h
#ifndef header_vector2d
#define header_vector2d
#ifdef CL_API_DLL
#ifdef CL_CORE_EXPORT
#define CL_API_CORE __declspec(dllexport)
#else
#define CL_API_CORE __declspec(dllimport)
#endif
#else
#define CL_API_CORE
#endif
#if _MSC_VER > 1000
#pragma once
#endif
//: A 2D Vector class
//- !group=Core/Math!
//- !header=core.h!
//- CL_Vector2 provides a 2D vector class.
//- This is different from {link CL_Vector CL_Vector.html}
class CL_API_CORE CL_Vector2
{
public:
//! Construction:
//: Default constructor
CL_Vector2();
//: Constructor with info
//param fX: The X coordinate.
//param fY: The Y coordinate.
CL_Vector2(float fX, float fY);
//: FIXME!
CL_Vector2(float afCoordinate[2]);
//: Copy constructor
//param 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
//- <p>Use vector V[0] for V.x
//- Use vector V[1] for V.y</p>
//return: The requested parameter
const float& operator[] (int i) const;
float& operator[] (int i);
//: Unknown
operator float* ();
//: assignment operator
CL_Vector2& operator= (const CL_Vector2& rkVector);
// comparison (supports fuzzy arithmetic when FUZZ > 0)
//: Equivalancy operator
//- <p>Supports fuzzy arimatic when FUZZ > 0</p>
bool operator== (const CL_Vector2& rkVector) const;
//: Not-equals operator
//- <p>Supports fuzzy arimatic when FUZZ > 0</p>
bool operator!= (const CL_Vector2& rkVector) const;
//: Less than operator
//- <p>Supports fuzzy arimatic when FUZZ > 0</p>
bool operator< (const CL_Vector2& rkVector) const;
//: Less than or equal operator
//- <p>Supports fuzzy arimatic when FUZZ > 0</p>
bool operator<= (const CL_Vector2& rkVector) const;
//: Greater than operator
//- <p>Supports fuzzy arimatic when FUZZ > 0</p>
bool operator> (const CL_Vector2& rkVector) const;
//: Greater than or equal operator
//- <p>Supports fuzzy arimatic when FUZZ > 0</p>
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
//return: 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
//return: 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
//return: Return y,-x
CL_Vector2 cross() const;
//: Unit Cross
//return: (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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