src/thirdparty/particles/pVec.h File Reference

#include <iostream>
#include <cstdlib>
#include <math.h>
#include <stdlib.h>

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Classes
class	pVec
Defines
#define	M_PI   3.1415926535897932384626433f
#define	P_ONEOVER_RAND_MAX   (1.0f/((float) RAND_MAX))
#define	pRandf()   (((float) rand())*P_ONEOVER_RAND_MAX)
#define	pSRandf(x)   srand(x)
#define	P_SQRT2PI   2.506628274631000502415765284811045253006f
#define	P_ONEOVERSQRT2PI   (1.f / P_SQRT2PI)
#define	P_ONE_OVER_SIGMA_EXP   (1.0f / 0.7975f)
Functions
static float	fsqr (float f)
static bool	pSameSign (const float &a, const float &b)
static bool	pSameSignd (const float &a, const float &b)
static float	pNRandf (float sigma=1.0f)
static pVec	pRandVec ()
static pVec	pNRandVec (float stdev)
Variables
static pVec	vHalf (0.5, 0.5, 0.5)

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Define Documentation

#define M_PI   3.1415926535897932384626433f

Definition at line 19 of file pVec.h.

#define P_ONE_OVER_SIGMA_EXP   (1.0f / 0.7975f)

Referenced by pNRandf().

#define P_ONEOVER_RAND_MAX   (1.0f/((float) RAND_MAX))

Definition at line 27 of file pVec.h.

#define P_ONEOVERSQRT2PI   (1.f / P_SQRT2PI)

Definition at line 33 of file pVec.h.

Referenced by PDBlob::PDBlob().

#define P_SQRT2PI   2.506628274631000502415765284811045253006f

Definition at line 32 of file pVec.h.

 

#define pRandf

(

)

(((float) rand())*P_ONEOVER_RAND_MAX)

Definition at line 28 of file pVec.h.

Referenced by PDDisc::Generate(), PDSphere::Generate(), PDCone::Generate(), PDCylinder::Generate(), PDRectangle::Generate(), PDTriangle::Generate(), PDLine::Generate(), pNRandf(), pRandVec(), and PDBlob::Within().

#define pSRandf

(

x

)

srand(x)

Definition at line 29 of file pVec.h.

Referenced by pSeed().

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Function Documentation

static float fsqr

(

float

f

)

[inline, static]

Definition at line 40 of file pVec.h.

Referenced by PAAvoid::Exec(), PDSphere::Generate(), pBounce(), pDamping(), PDBlob::PDBlob(), PDCone::PDCone(), PDCylinder::PDCylinder(), PDDisc::PDDisc(), PDSphere::PDSphere(), pNRandf(), pRotDamping(), and PDCone::Within().

{ return f * f; }

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static float pNRandf

(

float

sigma = 1.0f

)

[inline, static]

Definition at line 51 of file pVec.h.

References expf(), fsqr(), logf(), P_ONE_OVER_SIGMA_EXP, and pRandf.

Referenced by pNRandVec().

{
#define P_ONE_OVER_SIGMA_EXP (1.0f / 0.7975f)

    if(sigma == 0) return 0;

    float y;
    do {
        y = -logf(pRandf());
    }
    while(pRandf() > expf(-fsqr(y - 1.0f)*0.5f));

    if(rand() & 0x1)
        return y * sigma * P_ONE_OVER_SIGMA_EXP;
    else
        return -y * sigma * P_ONE_OVER_SIGMA_EXP;
}

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static pVec pNRandVec

(

float

stdev

)

[inline, static]

Definition at line 228 of file pVec.h.

References pNRandf().

Referenced by PDBlob::Generate().

{
    return pVec(pNRandf(stdev), pNRandf(stdev), pNRandf(stdev));
}

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static pVec pRandVec

(

)

[inline, static]

Definition at line 223 of file pVec.h.

References pRandf.

Referenced by PDSphere::Generate(), and PDBox::Generate().

{
    return pVec(pRandf(), pRandf(), pRandf());
}

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static bool pSameSign	(	const float &	a,
		const float &	b
	)			[inline, static]

Definition at line 42 of file pVec.h.

Referenced by PABounce::Exec(), and PAAvoid::Exec().

{ return a * b >= 0.0f; }

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static bool pSameSignd	(	const float &	a,
		const float &	b
	)			[inline, static]

Definition at line 43 of file pVec.h.

{
    const int *fi = reinterpret_cast<const int *>(&a);
    const int *gi = reinterpret_cast<const int *>(&b);
    return !(((*fi) ^ (*gi)) & 0x80000000);
}

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Variable Documentation

pVec vHalf(0.5, 0.5, 0.5) [static]

Referenced by PDSphere::Generate().

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