LOD.h

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * 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
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSG_LOD
#define OSG_LOD 1

#include <osg/Group>

namespace osg {

class OSG_EXPORT LOD : public Group
{
    public :

        LOD();

        LOD(const LOD&,const CopyOp& copyop=CopyOp::SHALLOW_COPY);

        META_Node(osg, LOD);

        typedef osg::BoundingSphere::vec_type vec_type;
        typedef osg::BoundingSphere::value_type value_type;

        virtual void traverse(NodeVisitor& nv);

        virtual bool addChild(Node *child);

        virtual bool addChild(Node *child, float min, float max);

        virtual bool removeChildren(unsigned int pos,unsigned int numChildrenToRemove=1);

        typedef std::pair<float,float>  MinMaxPair;
        typedef std::vector<MinMaxPair> RangeList;

        enum CenterMode
        {
            USE_BOUNDING_SPHERE_CENTER,
            USER_DEFINED_CENTER,
            UNION_OF_BOUNDING_SPHERE_AND_USER_DEFINED
        };

        void setCenterMode(CenterMode mode) { _centerMode=mode; }

        CenterMode getCenterMode() const { return _centerMode; }

        inline void setCenter(const vec_type& center) { if (_centerMode!=UNION_OF_BOUNDING_SPHERE_AND_USER_DEFINED) { _centerMode=USER_DEFINED_CENTER; } _userDefinedCenter = center; }

        inline const vec_type& getCenter() const { if ((_centerMode==USER_DEFINED_CENTER)||(_centerMode==UNION_OF_BOUNDING_SPHERE_AND_USER_DEFINED)) return _userDefinedCenter; else return getBound().center(); }


        inline void setRadius(value_type radius) { _radius = radius; }

        inline value_type getRadius() const { return _radius; }

        enum RangeMode
        {
            DISTANCE_FROM_EYE_POINT,
            PIXEL_SIZE_ON_SCREEN
        };

        void setRangeMode(RangeMode mode) { _rangeMode = mode; }

        RangeMode getRangeMode() const { return _rangeMode; }


        void setRange(unsigned int childNo, float min,float max);

        inline float getMinRange(unsigned int childNo) const { return _rangeList[childNo].first; }

        inline float getMaxRange(unsigned int childNo) const { return _rangeList[childNo].second; }

        inline unsigned int getNumRanges() const { return static_cast<unsigned int>(_rangeList.size()); }

        inline void setRangeList(const RangeList& rangeList) { _rangeList=rangeList; }

        inline const RangeList& getRangeList() const { return _rangeList; }

        virtual BoundingSphere computeBound() const;

    protected :
        virtual ~LOD() {}

        CenterMode                      _centerMode;
        vec_type                        _userDefinedCenter;
        value_type                      _radius;

        RangeMode                       _rangeMode;
        RangeList                       _rangeList;

};

}

#endif