96 lines
2.5 KiB
C
96 lines
2.5 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) 2021 Paul Ramsey <pramsey@cleverelephant.ca>
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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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#pragma once
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#include <geos/export.h>
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#include <memory>
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#include <geos/geom/util/GeometryTransformer.h>
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// Forward declarations
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namespace geos {
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namespace geom {
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class PrecisionModel;
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class Geometry;
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}
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}
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namespace geos {
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namespace precision { // geos.precision
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/** \brief
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* Reduces the precision of a {@link geom::Geometry}
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* according to the supplied {@link geom::PrecisionModel}, without
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* attempting to preserve valid topology.
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*
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* The topology of the resulting geometry may be invalid if
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* topological collapse occurs due to coordinates being shifted.
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* It is up to the client to check this and handle it if necessary.
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* Collapses may not matter for some uses. An example
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* is simplifying the input to the buffer algorithm.
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* The buffer algorithm does not depend on the validity of the input geometry.
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*
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*/
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class GEOS_DLL PrecisionReducerTransformer : public geom::util::GeometryTransformer {
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private:
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const geom::PrecisionModel& targetPM;
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bool isRemoveCollapsed;
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std::unique_ptr<geom::Geometry> reduceArea(const geom::Geometry* geom);
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void extend(
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geom::CoordinateSequence& coords,
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std::size_t minLength);
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public:
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PrecisionReducerTransformer(
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const geom::PrecisionModel& p_targetPM,
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bool p_isRemoveCollapsed = false)
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: targetPM(p_targetPM)
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, isRemoveCollapsed(p_isRemoveCollapsed)
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{};
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static std::unique_ptr<geom::Geometry> reduce(
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const geom::Geometry& geom,
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const geom::PrecisionModel& targetPM,
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bool isRemoveCollapsed = false);
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protected:
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std::unique_ptr<geom::CoordinateSequence> transformCoordinates(
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const geom::CoordinateSequence* coords,
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const geom::Geometry* parent) override;
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std::unique_ptr<geom::Geometry> transformPolygon(
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const geom::Polygon* geom,
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const geom::Geometry* parent) override;
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std::unique_ptr<geom::Geometry> transformMultiPolygon(
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const geom::MultiPolygon* geom,
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const geom::Geometry* parent) override;
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};
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} // namespace geos.precision
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} // namespace geos
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