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)
 *
 **********************************************************************/
 
#pragma once
 
#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::unique_ptr<geom::Envelope> env;
 
    geom::Coordinate centre;
 
    int level;
 
    Node* getSubnode(int index);
 
    std::unique_ptr<Node> createSubnode(int index);
 
protected:
 
    bool
    isSearchMatch(const geom::Envelope& searchEnv) const override
    {
        return env->intersects(searchEnv);
    }
 
public:
 
    // Create a node computing level from given envelope
    static std::unique_ptr<Node> createNode(const geom::Envelope& env);
 
    //
    static std::unique_ptr<Node> createExpanded(std::unique_ptr<Node> node,
            const geom::Envelope& addEnv);
 
    Node(std::unique_ptr<geom::Envelope> nenv, int nlevel)
        :
        env(std::move(nenv)),
        centre((env->getMinX() + env->getMaxX()) / 2,
               (env->getMinY() + env->getMaxY()) / 2),
        level(nlevel)
    {
    }
 
    ~Node() override {}
 
    geom::Envelope*
    getEnvelope()
    {
        return env.get();
    }
 
    Node* getNode(const geom::Envelope* searchEnv);
 
    NodeBase* find(const geom::Envelope* searchEnv);
 
    void insertNode(std::unique_ptr<Node> node);
 
    std::string toString() const override;
 
};
 
} // namespace geos::index::quadtree
} // namespace geos::index
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif