axmol/extensions/Particle3D/PU/CCPUParticleFollower.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.

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#include "CCPUParticleFollower.h"
#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"

NS_CC_BEGIN

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

//-----------------------------------------------------------------------
PUParticleFollower::PUParticleFollower()
    : PUAffector(), _minDistance(DEFAULT_MIN_DISTANCE), _maxDistance(DEFAULT_MAX_DISTANCE), _first(false)
{}

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

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

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

void PUParticleFollower::copyAttributesTo(PUAffector* affector)
{
    PUAffector::copyAttributesTo(affector);

    PUParticleFollower* particleFollower = static_cast<PUParticleFollower*>(affector);
    particleFollower->_maxDistance       = _maxDistance;
    particleFollower->_minDistance       = _minDistance;
}

NS_CC_END