OgreSphere.h
Go to the documentation of this file.

    00001 /*
    00002 -----------------------------------------------------------------------------
    00003 This source file is part of OGRE
    00004     (Object-oriented Graphics Rendering Engine)
    00005 For the latest info, see http://www.ogre3d.org/
    00006
    00007 Copyright (c) 2000-2012 Torus Knot Software Ltd
    00008
    00009 Permission is hereby granted, free of charge, to any person obtaining a copy
    00010 of this software and associated documentation files (the "Software"), to deal
    00011 in the Software without restriction, including without limitation the rights
    00012 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    00013 copies of the Software, and to permit persons to whom the Software is
    00014 furnished to do so, subject to the following conditions:
    00015
    00016 The above copyright notice and this permission notice shall be included in
    00017 all copies or substantial portions of the Software.
    00018
    00019 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    00020 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00021 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    00022 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00023 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    00024 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    00025 THE SOFTWARE.
    00026 -----------------------------------------------------------------------------
    00027 */
    00028 #ifndef __Sphere_H_
    00029 #define __Sphere_H_
    00030
    00031 // Precompiler options
    00032 #include "OgrePrerequisites.h"
    00033
    00034 #include "OgreVector3.h"
    00035
    00036 namespace Ogre {
    00037
    00038
    00051     class _OgreExport Sphere
    00052     {
    00053     protected:
    00054         Real mRadius;
    00055         Vector3 mCenter;
    00056     public:
    00058         Sphere() : mRadius(1.0), mCenter(Vector3::ZERO) {}
    00063         Sphere(const Vector3& center, Real radius)
    00064             : mRadius(radius), mCenter(center) {}
    00065
    00067         Real getRadius(void) const { return mRadius; }
    00068
    00070         void setRadius(Real radius) { mRadius = radius; }
    00071
    00073         const Vector3& getCenter(void) const { return mCenter; }
    00074
    00076         void setCenter(const Vector3& center) { mCenter = center; }
    00077
    00079         bool intersects(const Sphere& s) const
    00080         {
    00081             return (s.mCenter - mCenter).squaredLength() <=
    00082                 Math::Sqr(s.mRadius + mRadius);
    00083         }
    00085         bool intersects(const AxisAlignedBox& box) const
    00086         {
    00087             return Math::intersects(*this, box);
    00088         }
    00090         bool intersects(const Plane& plane) const
    00091         {
    00092             return Math::intersects(*this, plane);
    00093         }
    00095         bool intersects(const Vector3& v) const
    00096         {
    00097             return ((v - mCenter).squaredLength() <= Math::Sqr(mRadius));
    00098         }
    00100         void merge(const Sphere& oth)
    00101         {
    00102             Vector3 diff =  oth.getCenter() - mCenter;
    00103             Real lengthSq = diff.squaredLength();
    00104             Real radiusDiff = oth.getRadius() - mRadius;
    00105
    00106             // Early-out
    00107             if (Math::Sqr(radiusDiff) >= lengthSq)
    00108             {
    00109                 // One fully contains the other
    00110                 if (radiusDiff <= 0.0f)
    00111                     return; // no change
    00112                 else
    00113                 {
    00114                     mCenter = oth.getCenter();
    00115                     mRadius = oth.getRadius();
    00116                     return;
    00117                 }
    00118             }
    00119
    00120             Real length = Math::Sqrt(lengthSq);
    00121
    00122             Vector3 newCenter;
    00123             Real newRadius;
    00124             if ((length + oth.getRadius()) > mRadius)
    00125             {
    00126                 Real t = (length + radiusDiff) / (2.0f * length);
    00127                 newCenter = mCenter + diff * t;
    00128             }
    00129             // otherwise, we keep our existing center
    00130
    00131             newRadius = 0.5f * (length + mRadius + oth.getRadius());
    00132
    00133             mCenter = newCenter;
    00134             mRadius = newRadius;
    00135         }
    00136
    00137
    00138     };
    00142 }
    00143
    00144 #endif
    00145

Copyright © 2012 Torus Knot Software Ltd
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Last modified Sun Sep 2 2012 07:27:24