www.pudn.com > HGE_game_damo.rar > hgevector.h

/* 
** Haaf's Game Engine 1.5 
** Copyright (C) 2003-2004, Relish Games 
** hge.relishgames.com 
** 
** hgeVector helper class 
*/ 
 
 
#ifndef HGEVECTOR_H 
#define HGEVECTOR_H 
 
 
#include "hge.h" 
#include  
 
 
/* 
** Fast 1.0/sqrtf(float) routine 
*/ 
float InvSqrt(float x); 
 
class hgeVector 
{ 
public: 
	float	x,y; 
 
	hgeVector(float _x, float _y)	{ x=_x; y=_y; } 
	hgeVector()						{ x=0; y=0; } 
 
	hgeVector	operator- (const hgeVector &v) { return hgeVector(x-v.x, y-v.y); } 
	hgeVector	operator+ (const hgeVector &v) { return hgeVector(x+v.x, y+v.y); } 
	hgeVector	operator* (float scalar) { return hgeVector(x*scalar, y*scalar); } 
	hgeVector&	operator-= (const hgeVector &v) { x-=v.x; y-=v.y; return *this; } 
	hgeVector&	operator+= (const hgeVector &v) { x+=v.x; y+=v.y; return *this; } 
	hgeVector&	operator*= (float scalar) { x*=scalar; y*=scalar; return *this; } 
	hgeVector	operator- () { return hgeVector(-x, -y); } 
	bool		operator== (const hgeVector &v) { return (x==v.x && y==v.y); } 
	bool		operator!= (const hgeVector &v) { return (x!=v.x || y!=v.y); } 
 
	float		Dot(const hgeVector *v) const { return x*v->x + y*v->y; } 
	hgeVector*	Normalize() { float rc=InvSqrt(Dot(this)); x*=rc; y*=rc; return this; } 
	float		Length() const { return sqrtf(Dot(this)); } 
	float		Angle(const hgeVector *v = 0) const; 
	hgeVector*	Rotate(float a); 
}; 
 
inline hgeVector operator* (const hgeVector &v, float s) { return hgeVector(s*v.x, s*v.y); } 
inline hgeVector operator* (float s, const hgeVector &v) { return hgeVector(s*v.x, s*v.y); } 
inline float operator^ (const hgeVector &v, const hgeVector &u) { return v.Angle(&u); } 
inline float operator% (const hgeVector &v, const hgeVector &u) { return v.Dot(&u); } 
 
 
#endif