109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
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/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2006 Refractions Research Inc.
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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*
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**********************************************************************
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*
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* Last port: geom/prep/PreparedPolygonCovers.java rev 1.2 (JTS-1.10)
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* (2007-12-12)
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*
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**********************************************************************/
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#pragma once
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#include <geos/geom/prep/AbstractPreparedPolygonContains.h> // inherited
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// forward declarations
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namespace geos {
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namespace geom {
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class Geometry;
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namespace prep {
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class PreparedPolygon;
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}
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}
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}
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namespace geos {
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namespace geom { // geos::geom
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namespace prep { // geos::geom::prep
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/**
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* \brief
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* Computes the <tt>covers</tt> spatial relationship predicate
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* for a {@link PreparedPolygon} relative to all other {@link Geometry} classes.
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*
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* Uses short-circuit tests and indexing to improve performance.
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*
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* It is not possible to short-circuit in all cases, in particular
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* in the case where the test geometry touches the polygon linework.
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* In this case full topology must be computed.
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*
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* @author Martin Davis
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*
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*/
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class PreparedPolygonCovers : public AbstractPreparedPolygonContains {
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private:
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protected:
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/**
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* Computes the full topological <tt>covers</tt> predicate.
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* Used when short-circuit tests are not conclusive.
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*
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* @param geom the test geometry
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* @return true if this prepared polygon covers the test geometry
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*/
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bool fullTopologicalPredicate(const geom::Geometry* geom) override;
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public:
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/** \brief
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* Computes the <tt>covers</tt> predicate between a {@link PreparedPolygon}
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* and a {@link Geometry}.
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*
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* @param prep the prepared polygon
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* @param geom a test geometry
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* @return true if the polygon covers the geometry
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*/
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static bool
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covers(const PreparedPolygon* const prep, const geom::Geometry* geom)
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{
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PreparedPolygonCovers polyInt(prep);
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return polyInt.covers(geom);
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}
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/** \brief
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* Creates an instance of this operation.
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*
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* @param prep the PreparedPolygon to evaluate
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*/
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PreparedPolygonCovers(const PreparedPolygon* const prep)
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: AbstractPreparedPolygonContains(prep, false)
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{ }
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/** \brief
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* Tests whether this PreparedPolygon <tt>covers</tt> a given geometry.
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*
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* @param geom the test geometry
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* @return true if the test geometry is covered
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*/
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bool
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covers(const Geometry* geom)
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{
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return eval(geom);
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}
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};
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} // geos::geom::prep
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} // geos::geom
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} // geos
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