mirror of https://github.com/axmolengine/axmol.git
125 lines
4.6 KiB
C++
125 lines
4.6 KiB
C++
/****************************************************************************
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Copyright (C) 2013 Henry van Merode. All rights reserved.
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Copyright (c) 2015-2016 Chukong Technologies Inc.
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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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https://axis-project.github.io/
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "extensions/Particle3D/PU/CCPUOnTimeObserver.h"
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#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"
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NS_CC_BEGIN
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// Constants
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const float PUOnTimeObserver::DEFAULT_THRESHOLD = 0.0f;
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const bool PUOnTimeObserver::DEFAULT_SINCE_START_SYSTEM = false;
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static bool almostEquals(float a, float b, float epsilon = std::numeric_limits<float>::epsilon())
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{
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return fabs(a - b) <= ((fabs(a) < fabs(b) ? fabs(b) : fabs(a)) * epsilon);
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};
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//-----------------------------------------------------------------------
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PUOnTimeObserver::PUOnTimeObserver()
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: PUObserver()
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, _threshold(DEFAULT_THRESHOLD)
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, _compare(CO_GREATER_THAN)
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, _sinceStartSystem(DEFAULT_SINCE_START_SYSTEM){};
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//-----------------------------------------------------------------------
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void PUOnTimeObserver::preUpdateObserver(float deltaTime)
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{
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// Call parent
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PUObserver::preUpdateObserver(deltaTime);
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// Also observe if there are no particles emitted, because some of the event handlers do not only
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// perform an action on a particle.
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if (static_cast<PUParticleSystem3D*>(_particleSystem)->getAliveParticleCount() <= 0)
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{
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handleObserve(0, deltaTime);
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}
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}
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//-----------------------------------------------------------------------
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bool PUOnTimeObserver::observe(PUParticle3D* particle, float /*timeElapsed*/)
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{
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if (_compare == CO_GREATER_THAN)
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{
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if (_sinceStartSystem)
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{
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// Validate whether time since start of the particle system > threshold
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return (_particleSystem->getTimeElapsedSinceStart() > _threshold);
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}
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else
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{
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// Validate whether time since start of the particle emission > threshold
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return (particle && (particle->totalTimeToLive - particle->timeToLive) > _threshold);
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}
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}
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else if (_compare == CO_LESS_THAN)
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{
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if (_sinceStartSystem)
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{
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// Validate whether time since start of the particle system < threshold
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return (_particleSystem->getTimeElapsedSinceStart() < _threshold);
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}
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else
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{
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// Validate whether time since start of the particle emission < threshold
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return (particle && (particle->totalTimeToLive - particle->timeToLive) < _threshold);
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}
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}
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else
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{
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// Equals
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if (_sinceStartSystem)
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{
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// Validate whether time since start of the particle system == threshold
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return almostEquals(_particleSystem->getTimeElapsedSinceStart(), _threshold, 0.01f);
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}
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else
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{
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// Validate whether time since start of the particle emission == threshold
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return particle && almostEquals((particle->totalTimeToLive - particle->timeToLive), _threshold, 0.01f);
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}
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}
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return false;
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}
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PUOnTimeObserver* PUOnTimeObserver::create()
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{
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auto pto = new PUOnTimeObserver();
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pto->autorelease();
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return pto;
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}
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void PUOnTimeObserver::copyAttributesTo(PUObserver* observer)
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{
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PUObserver::copyAttributesTo(observer);
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PUOnTimeObserver* onTimeObserver = static_cast<PUOnTimeObserver*>(observer);
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onTimeObserver->_threshold = _threshold;
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onTimeObserver->_compare = _compare;
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onTimeObserver->_sinceStartSystem = _sinceStartSystem;
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}
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NS_CC_END
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