utils.h

来自「《游戏编程中的人工智能技术》一书中8」· C头文件 代码 · 共 93 行

#ifndef UTILS_H
#define UTILS_H

#include <stdlib.h>
#include <math.h>
#include <sstream>
#include <string>
#include <iostream>
#include <vector>

using namespace std;

//----------------------------------------------------------------------------
//	some random number functions.
//----------------------------------------------------------------------------

//returns a random integer between x and y
inline int	  RandInt(int x,int y) {return rand()%(y-x+1)+x;}

//returns a random float between zero and 1
inline double RandFloat()		   {return (rand())/(RAND_MAX+1.0);}

//returns a random bool
inline bool   RandBool()
{
	if (RandInt(0,1)) return true;

	else return false;
}

//returns a random float in the range -1 < n < 1
inline double RandomClamped()	   {return RandFloat() - RandFloat();}


//Gaussian distribution
inline double RandGauss()
{
	static int	  iset = 0;
	static double gset = 0;
	double fac = 0, rsq = 0, v1 = 0, v2 = 0;
	
	if (iset==0) 
	{
		do 
		{
			v1=2.0*RandFloat()-1.0;
			v2=2.0*RandFloat()-1.0;
			rsq=v1*v1+v2*v2;
		} 
		while (rsq>=1.0 || rsq==0.0);
		
		fac=sqrt(-2.0*log(rsq)/rsq);
		gset=v1*fac;
		iset=1;
		return v2*fac;
	}
	else 
	{
		iset = 0;
		return gset;
	}
}
//-----------------------------------------------------------------------
//	
//	some handy little functions
//-----------------------------------------------------------------------

//converts an integer to a std::string
string itos(int arg);

//converts an float to a std::string
string ftos (float arg);

//	clamps the first argument between the second two
void Clamp(double &arg, double min, double max);

/////////////////////////////////////////////////////////////////////
//
//	Point structure
//
/////////////////////////////////////////////////////////////////////
struct SPoint
{
	float x, y;
	
	SPoint(){}
	SPoint(float a, float b):x(a),y(b){}
};




#endif