axmol/extensions/Particle3D/PU/CCPUFlockCenteringAffector.cpp

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axis-project.github.io/

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 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
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 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "CCPUFlockCenteringAffector.h"
#include "Particle3D/PU/CCPUParticleSystem3D.h"

NS_AX_BEGIN
//-----------------------------------------------------------------------
PUFlockCenteringAffector::PUFlockCenteringAffector() : PUAffector(), _count(0.0f) {}

PUFlockCenteringAffector::~PUFlockCenteringAffector() {}

void PUFlockCenteringAffector::updatePUAffector(PUParticle3D* particle, float deltaTime)
{
    // for (auto&& iter : _particleSystem->getParticles())
    {
        // PUParticle3D *particle = iter;
        _sum += particle->position;
        _count++;
        particle->direction += (_average - particle->position) * deltaTime;  // use average of the previous update
    }
}

void PUFlockCenteringAffector::preUpdateAffector(float /*deltaTime*/)
{
    if (_count != 0)
    {
        // Calculate the average of the previous update
        _average = _sum / _count;
    }
    else
    {
        _average = getDerivedPosition();  // Set to position of the affector
    }
    _sum.setZero();
    _count = 0;
}

PUFlockCenteringAffector* PUFlockCenteringAffector::create()
{
    auto pfca = new PUFlockCenteringAffector();
    pfca->autorelease();
    return pfca;
}

void PUFlockCenteringAffector::copyAttributesTo(PUAffector* affector)
{
    PUAffector::copyAttributesTo(affector);
    PUFlockCenteringAffector* flockCenteringAffector = static_cast<PUFlockCenteringAffector*>(affector);
    flockCenteringAffector->_sum                     = _sum;
    flockCenteringAffector->_average                 = _average;
    flockCenteringAffector->_count                   = _count;
}

NS_AX_END