2015-02-11 18:14:22 +08:00
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/****************************************************************************
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2015-02-25 18:05:41 +08:00
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Copyright (C) 2013 Henry van Merode. All rights reserved.
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2015-02-12 16:09:08 +08:00
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Copyright (c) 2015 Chukong Technologies Inc.
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2015-02-11 18:14:22 +08:00
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http://www.cocos2d-x.org
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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 "CCPUParticle3DSphere.h"
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NS_CC_BEGIN
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PUSphere::PUSphere()
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: _radius(1.0)
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, _center(Vec3::ZERO)
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{
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}
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PUSphere::PUSphere( const Vec3& center, float radius )
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: _radius(radius)
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, _center(center)
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{
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}
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void PUSphere::merge( const PUSphere& oth )
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{
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Vec3 diff = oth.getCenter() - _center;
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float lengthSq = diff.lengthSquared();
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float radiusDiff = oth.getRadius() - _radius;
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// Early-out
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if ((radiusDiff * radiusDiff) >= lengthSq)
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{
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// One fully contains the other
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if (radiusDiff <= 0.0f)
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return; // no change
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else
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{
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_center = oth.getCenter();
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_radius = oth.getRadius();
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return;
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}
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}
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float length = lengthSq * lengthSq;
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Vec3 newCenter;
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float newRadius;
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if ((length + oth.getRadius()) > _radius)
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{
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float t = (length + radiusDiff) / (2.0f * length);
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newCenter = _center + diff * t;
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}
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// otherwise, we keep our existing center
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newRadius = 0.5f * (length + _radius + oth.getRadius());
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_center = newCenter;
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_radius = newRadius;
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}
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NS_CC_END
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