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qgsspatialindex.cpp
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qgsspatialindex.cpp
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/***************************************************************************
qgsspatialindex.cpp - 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. *
* *
***************************************************************************/
/* $Id$ */
#include "qgsspatialindex.h"
#include "qgsgeometry.h"
#include "qgsfeature.h"
#include "qgsrectangle.h"
#include "qgslogger.h"
#include "SpatialIndex.h"
using namespace SpatialIndex;
// custom visitor that adds found features to list
class QgisVisitor : public SpatialIndex::IVisitor
{
public:
QgisVisitor( QList<int> & list )
: mList( list ) {}
void visitNode( const INode& n ) {}
void visitData( const IData& d )
{
mList.append( d.getIdentifier() );
}
void visitData( std::vector<const IData*>& v ) {}
private:
QList<int>& mList;
};
QgsSpatialIndex::QgsSpatialIndex()
{
// for now only memory manager
mStorageManager = StorageManager::createNewMemoryStorageManager();
// create buffer
unsigned int capacity = 10;
bool writeThrough = false;
mStorage = StorageManager::createNewRandomEvictionsBuffer( *mStorageManager, capacity, writeThrough );
// R-Tree parameters
double fillFactor = 0.7;
unsigned long indexCapacity = 10;
unsigned long leafCapacity = 10;
unsigned long dimension = 2;
RTree::RTreeVariant variant = RTree::RV_RSTAR;
// create R-tree
long indexId;
mRTree = RTree::createNewRTree( *mStorage, fillFactor, indexCapacity,
leafCapacity, dimension, variant, indexId );
}
QgsSpatialIndex:: ~QgsSpatialIndex()
{
delete mRTree;
delete mStorage;
delete mStorageManager;
}
Tools::Geometry::Region QgsSpatialIndex::rectToRegion( QgsRectangle rect )
{
double pt1[2], pt2[2];
pt1[0] = rect.xMinimum();
pt1[1] = rect.yMinimum();
pt2[0] = rect.xMaximum();
pt2[1] = rect.yMaximum();
return Tools::Geometry::Region( pt1, pt2, 2 );
}
bool QgsSpatialIndex::featureInfo( QgsFeature& f, Tools::Geometry::Region& r, long& id )
{
QgsGeometry *g = f.geometry();
if ( !g )
return false;
id = f.id();
r = rectToRegion( g->boundingBox() );
return true;
}
bool QgsSpatialIndex::insertFeature( QgsFeature& f )
{
Tools::Geometry::Region r;
long id;
if ( !featureInfo( f, r, id ) )
return false;
// TODO: handle possible exceptions correctly
try
{
mRTree->insertData( 0, 0, r, id );
}
catch ( Tools::Exception &e )
{
Q_UNUSED(e);
QgsDebugMsg( QString( "Tools::Exception caught: " ).arg( e.what().c_str() ) );
}
catch ( const std::exception &e )
{
Q_UNUSED(e);
QgsDebugMsg( QString( "std::exception caught: " ).arg( e.what() ) );
}
catch ( ... )
{
QgsDebugMsg( "unknown spatial index exception caught" );
}
return true;
}
bool QgsSpatialIndex::deleteFeature( QgsFeature& f )
{
Tools::Geometry::Region r;
long id;
if ( !featureInfo( f, r, id ) )
return false;
// TODO: handle exceptions
return mRTree->deleteData( r, id );
}
QList<int> QgsSpatialIndex::intersects( QgsRectangle rect )
{
QList<int> list;
QgisVisitor visitor( list );
Tools::Geometry::Region r = rectToRegion( rect );
mRTree->intersectsWithQuery( r, visitor );
return list;
}
QList<int> QgsSpatialIndex::nearestNeighbor( QgsPoint point, int neighbors )
{
QList<int> list;
QgisVisitor visitor( list );
double pt[2];
pt[0] = point.x();
pt[1] = point.y();
Tools::Geometry::Point p( pt, 2 );
mRTree->nearestNeighborQuery( neighbors, p, visitor );
return list;
}