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/**********************************************************************
* $Id: LineSegmentIndex.cpp 1820 2006-09-06 16:54:23Z mloskot $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* 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 Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
**********************************************************************
*
* Last port: simplify/LineSegmentIndex.java rev. 1.1 (JTS-1.7.1)
*
**********************************************************************/
#include <geos/simplify/LineSegmentIndex.h>
#include <geos/simplify/TaggedLineSegment.h>
#include <geos/simplify/TaggedLineString.h>
#include <geos/index/quadtree/Quadtree.h>
#include <geos/index/ItemVisitor.h>
#include <geos/geom/LineSegment.h>
#include <geos/geom/Envelope.h>
#include <vector>
#include <memory> // for auto_ptr
#include <cassert>
#ifndef GEOS_DEBUG
#define GEOS_DEBUG 0
#endif
#ifdef GEOS_DEBUG
#include <iostream>
#endif
using namespace std;
using namespace geos::geom;
using namespace geos::index::quadtree;
namespace geos {
namespace simplify { // geos::simplify
/**
* ItemVisitor subclass to reduce volume of query results.
*/
class LineSegmentVisitor: public index::ItemVisitor {
// MD - only seems to make about a 10% difference in overall time.
private:
const LineSegment* querySeg;
auto_ptr< vector<LineSegment*> > items;
public:
LineSegmentVisitor(const LineSegment* s)
:
ItemVisitor(),
querySeg(s),
items(new vector<LineSegment*>())
{}
virtual ~LineSegmentVisitor()
{
// nothing to do, LineSegments are not owned by us
}
LineSegmentVisitor(const LineSegmentVisitor& o)
:
ItemVisitor(),
querySeg(o.querySeg),
items(new vector<LineSegment*>(*(o.items.get())))
{
}
LineSegmentVisitor& operator=(const LineSegmentVisitor& o)
{
if ( this == &o ) return *this;
querySeg = o.querySeg;
items.reset(new vector<LineSegment*>(*(o.items.get())));
}
void visitItem(void* item)
{
LineSegment* seg = (LineSegment*) item;
if ( Envelope::intersects(seg->p0, seg->p1,
querySeg->p0, querySeg->p1) )
{
items->push_back(seg);
}
}
auto_ptr< vector<LineSegment*> > getItems()
{
return items;
}
};
/*public*/
LineSegmentIndex::LineSegmentIndex()
:
index(new Quadtree())
{
}
/*public*/
LineSegmentIndex::~LineSegmentIndex()
{
for (size_t i=0, n=newEnvelopes.size(); i<n; ++i)
{
delete newEnvelopes[i];
}
}
/*public*/
void
LineSegmentIndex::add(const TaggedLineString& line)
{
const vector<TaggedLineSegment*>& segs = line.getSegments();
for (size_t i=0, n=segs.size(); i<n; ++i)
{
const LineSegment* seg = segs[i];
add(seg);
}
}
/*public*/
void
LineSegmentIndex::add(const LineSegment* seg)
{
Envelope* env = new Envelope(seg->p0, seg->p1);
newEnvelopes.push_back(env);
// We need a cast because index wants a non-const,
// altought it won't change the argument
index->insert(env, (LineSegment*)seg);
}
/*public*/
void
LineSegmentIndex::remove(const LineSegment* seg)
{
Envelope env(seg->p0, seg->p1);
// We need a cast because index wants a non-const
// altought it won't change the argument
index->remove(&env, (LineSegment*)seg);
}
/*public*/
auto_ptr< vector<LineSegment*> >
LineSegmentIndex::query(const LineSegment* querySeg) const
{
Envelope env(querySeg->p0, querySeg->p1);
LineSegmentVisitor visitor(querySeg);
index->query(&env, visitor);
auto_ptr< vector<LineSegment*> > itemsFound = visitor.getItems();
return itemsFound;
}
} // namespace geos::simplify
} // namespace geos
/**********************************************************************
* $Log$
* Revision 1.4 2006/06/12 17:18:56 strk
* LineSegmentIndex: explicitly initialized parent class in constructors.
*
* Revision 1.3 2006/06/12 11:29:24 strk
* unsigned int => size_t
*
* Revision 1.2 2006/04/13 09:28:09 mloskot
* Removed definition of copy ctor and assignment operator for LineSegmentString class.
*
* Revision 1.1 2006/04/12 15:20:37 strk
* LineSegmentIndex class
*
**********************************************************************/
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