axmol/extensions/Particle3D/ParticleUniverse/ParticleAffectors/CCPUParticle3DParticleFollower.cpp

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015 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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#include "CCPUParticle3DParticleFollower.h"
#include "extensions/Particle3D/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 (std::nothrow) PUParticle3DParticleFollower();
    ppf->autorelease();
    return ppf;
}

NS_CC_END