104 lines
2.8 KiB
C
104 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 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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* Last port: simplify/DouglasPeuckerLineSimplifier.java rev. 1.4
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*
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**********************************************************************/
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#pragma once
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#include <geos/export.h>
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#include <geos/geom/CoordinateSequence.h>
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#include <vector>
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#include <memory> // for unique_ptr
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
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#endif
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// Forward declarations
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namespace geos {
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namespace geom {
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class Coordinate;
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}
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}
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namespace geos {
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namespace simplify { // geos::simplify
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/** \brief
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* Simplifies a linestring (sequence of points) using
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* the standard Douglas-Peucker algorithm.
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*/
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class GEOS_DLL DouglasPeuckerLineSimplifier {
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public:
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/** \brief
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* Returns a newly allocated Coordinate vector, wrapped
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* into an unique_ptr
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*/
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static std::unique_ptr<geom::CoordinateSequence> simplify(
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const geom::CoordinateSequence& nPts,
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double distanceTolerance,
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bool preserveClosedEndpoint);
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DouglasPeuckerLineSimplifier(const geom::CoordinateSequence& nPts);
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/** \brief
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* Sets the distance tolerance for the simplification.
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*
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* All vertices in the simplified linestring will be within this
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* distance of the original linestring.
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*
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* @param nDistanceTolerance the approximation tolerance to use
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*/
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void setDistanceTolerance(double nDistanceTolerance);
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/** \brief
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* Sets whether the endpoint of a closed LineString should be preserved
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*
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* @param preserve `true` if the endpoint should be preserved
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*/
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void setPreserveClosedEndpoint(bool preserve);
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/** \brief
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* Returns a newly allocated Coordinate vector, wrapped
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* into an unique_ptr
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*/
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std::unique_ptr<geom::CoordinateSequence> simplify();
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private:
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const geom::CoordinateSequence& pts;
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std::vector<bool> usePt;
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double distanceTolerance;
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bool preserveEndpoint;
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void simplifySection(std::size_t i, std::size_t j);
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// Declare type as noncopyable
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DouglasPeuckerLineSimplifier(const DouglasPeuckerLineSimplifier& other) = delete;
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DouglasPeuckerLineSimplifier& operator=(const DouglasPeuckerLineSimplifier& rhs) = delete;
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};
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} // namespace geos::simplify
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} // namespace geos
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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