vector2d.h

来自「一个自己写的游戏引擎,用DirectX 写成」· C头文件 代码 · 共 58 行

//--------------------------------------------------
//  Desc: 2D Vector
//  Date: 2006.11.9 /update
//  Author: artsylee
//
//  Copyright (C) 2006 artsylee
//
//--------------------------------------------------

#ifndef _VECTOR2D_
#define _VECTOR2D_

#include <math.h>

#ifdef __cplusplus
extern "C"
{
#endif

ASE_DLL float __stdcall InvSqrt(const float x);

#ifdef __cplusplus
}
#endif

class ASE_DLL Vector2D
{
public:
	float	x;
	float	y;

	Vector2D(float fx, float fy)	{ x = fx; y = fy;	}
	Vector2D()						{ x = 0; y = 0;		}

	Vector2D	operator-(const Vector2D &v)	{ return Vector2D(x - v.x, y - v.y);	}
	Vector2D	operator+(const Vector2D &v)	{ return Vector2D(x + v.x, y + v.y);	}
	Vector2D	operator*(float scale)			{ return Vector2D(x*scale, y*scale);	}
	Vector2D&	operator-=(const Vector2D &v)	{ x -= v.x; y -= v.y; return *this;		}
	Vector2D&	operator+=(const Vector2D &v)	{ x += v.x; y += v.y; return *this;		}
	Vector2D&	operator*=(float scale)			{ x*=scale; y*=scale; return *this;		}
	Vector2D	operator-()						{ return Vector2D(-x, -y);	}
	Vector2D	operator+()						{ return Vector2D(x, y);	}
	bool		operator==(const Vector2D &v)	{ return (x == v.x && y == v.y); }
	bool		operator!=(const Vector2D &v)	{ return (x != v.x || y != v.y); }

	float		Length(void);
	float		Dot(const Vector2D *v);
	float		Angle(const Vector2D *v = 0);
	Vector2D*	Normalize(void);
	Vector2D*	Rotate(float a);
};

inline Vector2D operator*(const Vector2D &v, float s)			{ return Vector2D(s * v.x, s * v.y);	}
inline Vector2D operator*(float s, const Vector2D &v)			{ return Vector2D(s * v.x, s * v.y);	}


#endif // _VECTOR2D_