RedCore/cocos2d/extensions/Particle3D/PU/CCPUParticleFollower.cpp

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2017 Chukong Technologies Inc.
 
 http://www.cocos2d-x.org
 
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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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(void) : 
    PUAffector(),
    _minDistance(DEFAULT_MIN_DISTANCE),
    _maxDistance(DEFAULT_MAX_DISTANCE),
    _first(false)
{
}

PUParticleFollower::~PUParticleFollower( void )
{

}
//-----------------------------------------------------------------------
float PUParticleFollower::getMaxDistance(void) const
{
    return _maxDistance;
}
//-----------------------------------------------------------------------
void PUParticleFollower::setMaxDistance(float maxDistance)
{
    _maxDistance = maxDistance;
}
//-----------------------------------------------------------------------
float PUParticleFollower::getMinDistance(void) 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 (std::nothrow) 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