qgsspatialindex.h

来自「一个非常好的GIS开源新版本」· C头文件 代码 · 共 105 行

/***************************************************************************
    qgsspatialindex.h  - wrapper class for spatial index library
    ----------------------
    begin                : December 2006
    copyright            : (C) 2006 by Martin Dobias
    email                : wonder.sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
/* $Id$ */

#ifndef QGSSPATIALINDEX_H
#define QGSSPATIALINDEX_H

// forward declaration
namespace SpatialIndex
{
  class IStorageManager;
  class ISpatialIndex;

  namespace StorageManager
  {
    class IBuffer;
  }
}

namespace Tools
{
  namespace Geometry
  {
    class Region;
  }
}

class QgsFeature;
class QgsRect;
class QgsPoint;
#include <QList>

class CORE_EXPORT QgsSpatialIndex
{

public:

  /* creation of spatial index */

  /** create new spatial index that will be stored in memory */
  //static QgsSpatialIndex* createMemoryIndex();

  /** create new spatial index that stores its data on disk */
  //static QgsSpatialIndex* createDiskIndex(QString fileName);

  /** constructor - creates R-tree */
  QgsSpatialIndex();
  
  /** destructor finalizes work with spatial index */
  ~QgsSpatialIndex();


  /* operations */

  /** add feature to index */
  bool insertFeature(QgsFeature& f);

  /** remove feature from index */
  bool deleteFeature(QgsFeature& f);


  /* queries */

  /** returns features that intersect the specified rectangle */
  QList<int> intersects(QgsRect rect);

  /** returns nearest neighbors (their count is specified by second parameter) */
  QList<int> nearestNeighbor(QgsPoint point, int neighbors);


protected:

  Tools::Geometry::Region rectToRegion(QgsRect rect);
  
  bool featureInfo(QgsFeature& f, Tools::Geometry::Region& r, long& id);


private:

  /** storage manager */
  SpatialIndex::IStorageManager* mStorageManager;

  /** buffer for index data */
  SpatialIndex::StorageManager::IBuffer* mStorage;

  /** R-tree containing spatial index */
  SpatialIndex::ISpatialIndex* mRTree;

};

#endif