94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
/**********************************************************************
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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/TopologyPreservingSimplifier.java r536 (JTS-1.12+)
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*
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**********************************************************************
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*
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* NOTES:
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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/Geometry.h>
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#include <geos/simplify/TaggedLinesSimplifier.h>
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#include <memory> // for unique_ptr
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#include <map>
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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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namespace geos {
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namespace simplify { // geos::simplify
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/** \brief
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* Simplifies a geometry, ensuring that
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* the result is a valid geometry having the
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* same dimension and number of components as the input.
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*
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* The simplification uses a maximum distance difference algorithm
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* similar to the one used in the Douglas-Peucker algorithm.
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*
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* In particular, if the input is an areal geometry
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* ( Polygon or MultiPolygon )
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*
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* - The result has the same number of shells and holes (rings) as the input,
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* in the same order
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* - The result rings touch at <b>no more</b> than the number of touching point in the input
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* (although they may touch at fewer points)
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*
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*/
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class GEOS_DLL TopologyPreservingSimplifier {
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public:
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static std::unique_ptr<geom::Geometry> simplify(
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const geom::Geometry* geom,
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double tolerance);
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TopologyPreservingSimplifier(const geom::Geometry* geom);
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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 geometry will be within this
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* distance of the original geometry.
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* The tolerance value must be non-negative. A tolerance value
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* of zero is effectively a no-op.
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*
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* @param tolerance the approximation tolerance to use
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*/
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void setDistanceTolerance(double tolerance);
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std::unique_ptr<geom::Geometry> getResultGeometry();
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private:
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const geom::Geometry* inputGeom;
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std::unique_ptr<TaggedLinesSimplifier> lineSimplifier;
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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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