index/quadtree/Node.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2006 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: index/quadtree/Node.java rev 1.8 (JTS-1.10)
 *
 **********************************************************************/
 
#ifndef GEOS_IDX_QUADTREE_NODE_H
#define GEOS_IDX_QUADTREE_NODE_H
 
#include <geos/export.h>
#include <geos/index/quadtree/NodeBase.h> // for inheritance
#include <geos/geom/Coordinate.h> // for composition
#include <geos/geom/Envelope.h> // for inline
 
#include <string>
#include <memory>
 
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif
 
// Forward declarations
namespace geos {
        namespace geom {
                //class Coordinate;
                class Envelope;
        }
}
 
namespace geos {
namespace index { // geos::index
namespace quadtree { // geos::index::quadtree

class GEOS_DLL Node: public NodeBase {
 
private:

        std::auto_ptr<geom::Envelope> env;
 
        geom::Coordinate centre;
 
        int level;

        Node* getSubnode(int index);
 
        std::auto_ptr<Node> createSubnode(int index);
 
protected:
 
        bool isSearchMatch(const geom::Envelope& searchEnv) const {
                return env->intersects(searchEnv);
        }
 
public:
 
        // Create a node computing level from given envelope
        static std::auto_ptr<Node> createNode(const geom::Envelope& env);

        //
        static std::auto_ptr<Node> createExpanded(std::auto_ptr<Node> node,
                        const geom::Envelope& addEnv);
 
        Node(std::auto_ptr<geom::Envelope> nenv, int nlevel)
                :
                env(nenv),
                centre((env->getMinX()+env->getMaxX())/2,
                        (env->getMinY()+env->getMaxY())/2),
                level(nlevel)
        {
        }
 
        virtual ~Node() {}

        geom::Envelope* getEnvelope() { return env.get(); }

        Node* getNode(const geom::Envelope *searchEnv);

        NodeBase* find(const geom::Envelope *searchEnv);
 
        void insertNode(std::auto_ptr<Node> node);
 
        std::string toString() const;
 
};
 
} // namespace geos::index::quadtree
} // namespace geos::index
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif
 
#endif // GEOS_IDX_QUADTREE_NODE_H