mirror of https://github.com/axmolengine/axmol.git
86 lines
3.2 KiB
C++
86 lines
3.2 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/CCPUOnVelocityObserver.h"
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#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"
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NS_CC_BEGIN
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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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// Constants
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const float PUOnVelocityObserver::DEFAULT_VELOCITY_THRESHOLD = 0.0f;
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//-----------------------------------------------------------------------
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PUOnVelocityObserver::PUOnVelocityObserver()
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: PUObserver(), _threshold(DEFAULT_VELOCITY_THRESHOLD), _compare(CO_LESS_THAN){};
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//-----------------------------------------------------------------------
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bool PUOnVelocityObserver::observe(PUParticle3D* particle, float /*timeElapsed*/)
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{
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if (!particle)
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return false;
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// Compensate for the scaled velocity
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float scaleVelocity = _particleSystem->getParticleSystemScaleVelocity();
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if (_compare == CO_GREATER_THAN)
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{
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// Changed in V 1.3.1
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return (particle->calculateVelocity()) > (scaleVelocity * _threshold);
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}
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else if (_compare == CO_LESS_THAN)
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{
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return (particle->calculateVelocity()) < (scaleVelocity * _threshold);
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}
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else
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{
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// Equals
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return almostEquals(particle->calculateVelocity(), (scaleVelocity * _threshold), 0.01f);
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}
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return false;
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}
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PUOnVelocityObserver* PUOnVelocityObserver::create()
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{
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auto pvo = new PUOnVelocityObserver();
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pvo->autorelease();
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return pvo;
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}
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void PUOnVelocityObserver::copyAttributesTo(PUObserver* observer)
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{
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PUObserver::copyAttributesTo(observer);
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PUOnVelocityObserver* onVelocityObserver = static_cast<PUOnVelocityObserver*>(observer);
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onVelocityObserver->_threshold = _threshold;
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onVelocityObserver->_compare = _compare;
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}
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NS_CC_END
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