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// llsphere.h
/**
* @file llsphere.cpp
* @author Andrew Meadows
* @brief Simple sphere implementation for basic geometric operations
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_SPHERE_H
#define LL_SPHERE_H
#include "stdtypes.h"
#include "v3math.h"
#include <iostream>
#include <vector>
class LLSphere
{
public:
LLSphere();
LLSphere( const LLVector3& center, F32 radius );
void set( const LLVector3& center, F32 radius );
void setCenter( const LLVector3& center );
void setRadius( F32 radius );
const LLVector3& getCenter() const;
F32 getRadius() const;
// returns true if this sphere completely contains other_sphere
bool contains(const LLSphere& other_sphere) const;
// returns true if this sphere overlaps other_sphere
bool overlaps(const LLSphere& other_sphere) const;
// returns overlap distance
// negative overlap is closest approach
F32 getOverlap(const LLSphere& other_sphere) const;
// removes any spheres that are contained in others
static void collapse(std::vector<LLSphere>& sphere_list);
// returns minimum sphere bounding sphere for a set of spheres
static LLSphere getBoundingSphere(const LLSphere& first_sphere, const LLSphere& second_sphere);
static LLSphere getBoundingSphere(const std::vector<LLSphere>& sphere_list);
bool operator==(const LLSphere& rhs) const;
friend std::ostream& operator<<( std::ostream& output_stream, const LLSphere& line );
protected:
LLVector3 mCenter;
F32 mRadius;
};
#endif
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