/usr/include/geos/geom/prep/PreparedPolygonCovers.h is in libgeos-dev 3.2.2-3ubuntu1.
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* $Id: PreparedPolygonCovers.h 2420 2009-04-29 08:56:14Z strk $
*
* 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 Public Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
*
**********************************************************************
*
* Last port: geom/prep/PreparedPolygonCovers.java rev 1.2 (JTS-1.10)
* (2007-12-12)
*
**********************************************************************/
#ifndef GEOS_GEOM_PREP_PREPAREDPOLYGONCOVERS_H
#define GEOS_GEOM_PREP_PREPAREDPOLYGONCOVERS_H
#include <geos/geom/prep/AbstractPreparedPolygonContains.h> // inherited
// forward declarations
namespace geos {
namespace geom {
class Geometry;
namespace prep {
class PreparedPolygon;
}
}
}
namespace geos {
namespace geom { // geos::geom
namespace prep { // geos::geom::prep
/**
* \brief
* Computes the <tt>covers</tt> spatial relationship predicate
* for a {@link PreparedPolygon} relative to all other {@link Geometry} classes.
*
* Uses short-circuit tests and indexing to improve performance.
*
* It is not possible to short-circuit in all cases, in particular
* in the case where the test geometry touches the polygon linework.
* In this case full topology must be computed.
*
* @author Martin Davis
*
*/
class PreparedPolygonCovers : public AbstractPreparedPolygonContains
{
private:
protected:
/**
* Computes the full topological <tt>covers</tt> predicate.
* Used when short-circuit tests are not conclusive.
*
* @param geom the test geometry
* @return true if this prepared polygon covers the test geometry
*/
bool fullTopologicalPredicate( const geom::Geometry * geom);
public:
/**
* Computes the </tt>covers</tt> predicate between a {@link PreparedPolygon}
* and a {@link Geometry}.
*
* @param prep the prepared polygon
* @param geom a test geometry
* @return true if the polygon covers the geometry
*/
static bool covers(const PreparedPolygon * const prep, const geom::Geometry * geom)
{
PreparedPolygonCovers polyInt(prep);
return polyInt.covers(geom);
}
/**
* Creates an instance of this operation.
*
* @param prepPoly the PreparedPolygon to evaluate
*/
PreparedPolygonCovers(const PreparedPolygon * const prep)
: AbstractPreparedPolygonContains( prep, false)
{ }
/**
* Tests whether this PreparedPolygon <tt>covers</tt> a given geometry.
*
* @param geom the test geometry
* @return true if the test geometry is covered
*/
bool covers( const Geometry * geom)
{
return eval( geom);
}
};
} // geos::geom::prep
} // geos::geom
} // geos
#endif // GEOS_GEOM_PREP_PREPAREDPOLYGONCOVERS_H
/**********************************************************************
* $Log$
**********************************************************************/
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