axmol/extensions/3dparticle/ParticleUniverse/ParticleAffectors/CCPUParticle3DParticleFollower.cpp

/****************************************************************************
 Copyright (c) 2014 Chukong Technologies Inc.
 
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#include "CCPUParticle3DParticleFollower.h"
#include "3dparticle/ParticleUniverse/CCPUParticleSystem3D.h"

NS_CC_BEGIN

// Constants
const float PUParticle3DParticleFollower::DEFAULT_MAX_DISTANCE = 3.40282e+038f;
const float PUParticle3DParticleFollower::DEFAULT_MIN_DISTANCE = 10.0f;

//-----------------------------------------------------------------------
PUParticle3DParticleFollower::PUParticle3DParticleFollower(void) : 
    PUParticle3DAffector(),
    _minDistance(DEFAULT_MIN_DISTANCE),
    _maxDistance(DEFAULT_MAX_DISTANCE),
    _positionPreviousParticle(Vec3::ZERO),
    _first(false)
{
}

PUParticle3DParticleFollower::~PUParticle3DParticleFollower( void )
{

}
//-----------------------------------------------------------------------
float PUParticle3DParticleFollower::getMaxDistance(void) const
{
    return _maxDistance;
}
//-----------------------------------------------------------------------
void PUParticle3DParticleFollower::setMaxDistance(float maxDistance)
{
    _maxDistance = maxDistance;
}
//-----------------------------------------------------------------------
float PUParticle3DParticleFollower::getMinDistance(void) const
{
    return _minDistance;
}
//-----------------------------------------------------------------------
void PUParticle3DParticleFollower::setMinDistance(float minDistance)
{
    _minDistance = minDistance;
}

void PUParticle3DParticleFollower::updatePUAffector( PUParticle3D *particle, float deltaTime )
{
    //_first = true;
    //for (auto iter : _particleSystem->getParticles())
    {
        //PUParticle3D *particle = iter;
        if (!_first)
        {
            // Change in V 1.3.1
            // Only proceed if it isn the first one. Compensate for scaling.
            float distance = (particle->position).distance(_positionPreviousParticle);
            float avgScale = 0.3333f * (_affectorScale.x + _affectorScale.y + _affectorScale.z);
            float scaledMinDistance = avgScale * _minDistance;
            if (distance > scaledMinDistance && distance < avgScale * _maxDistance)
            {
                // This particle drifts too much from the previous one; correct it!
                float f = scaledMinDistance/distance;
                particle->position = _positionPreviousParticle + f * (particle->position - _positionPreviousParticle);
            }
        }
        _positionPreviousParticle = particle->position;
        _first = false;
    }
}

void PUParticle3DParticleFollower::firstParticleUpdate( PUParticle3D *particle, float deltaTime )
{
    _first = true;
}

PUParticle3DParticleFollower* PUParticle3DParticleFollower::create()
{
    auto ppf = new PUParticle3DParticleFollower();
    ppf->autorelease();
    return ppf;
}

NS_CC_END