AgentKDTree.h

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/*

License

Menge
Copyright © and trademark ™ 2012-14 University of North Carolina at Chapel Hill. 
All rights reserved.

Permission to use, copy, modify, and distribute this software and its documentation 
for educational, research, and non-profit purposes, without fee, and without a 
written agreement is hereby granted, provided that the above copyright notice, 
this paragraph, and the following four paragraphs appear in all copies.

This software program and documentation are copyrighted by the University of North 
Carolina at Chapel Hill. The software program and documentation are supplied "as is," 
without any accompanying services from the University of North Carolina at Chapel 
Hill or the authors. The University of North Carolina at Chapel Hill and the 
authors do not warrant that the operation of the program will be uninterrupted 
or error-free. The end-user understands that the program was developed for research 
purposes and is advised not to rely exclusively on the program for any reason.

IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE AUTHORS 
BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL 
DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS 
DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE 
AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY 
DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY STATUTORY WARRANTY 
OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND 
THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS HAVE NO OBLIGATIONS 
TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

Any questions or comments should be sent to the authors {menge,geom}@cs.unc.edu

*/

#ifndef __AGENT_KD_TREE_H__
#define __AGENT_KD_TREE_H__

// STL
#include "CoreConfig.h"
#include <vector>
#include <cstddef>
#include "SpatialQueries/ProximityQuery.h"


namespace Menge {

    namespace Agents {

        // FORWARD DECLARATIONS
        class BaseAgent;

        // TODO: Adapt this so that the number of agents can be changed -- i.e. removing and
        //  introducing new agents in the simulation

        class MENGE_API AgentKDTree {
        private:
            struct AgentTreeNode {
                size_t _begin;

                size_t _end;

                size_t _left;

                float _maxX;

                float _maxY;

                float _minX;

                float _minY;

                size_t _right;
            };
        public:
            explicit AgentKDTree();

            void setAgents( const std::vector< BaseAgent * > & agents );    

            void buildTree();   

            void agentQuery( ProximityQuery *filter) const;

        protected:
            void buildTreeRecursive(size_t begin, size_t end, size_t node);

            void queryTreeRecursive( ProximityQuery *filter, Vector2 pt, float& rangeSq, size_t node) const;

            std::vector< const BaseAgent * > _agents;

            std::vector<AgentTreeNode> _tree;

            static const size_t MAX_LEAF_SIZE = 10;
        };
    }       // namespace Agents
}   // namespace Menge

#endif  // __AGENT_KD_TREE_H__