112 lines
3.1 KiB
C++
112 lines
3.1 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) 2021 Martin Davis
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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 <geos/geom/CoordinateSequence.h> // to materialize CoordinateSequence
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#include <memory>
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#include <vector>
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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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class CoordinateSequence;
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class Geometry;
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class GeometryFactory;
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class LineString;
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}
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}
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using geos::geom::Coordinate;
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using geos::geom::CoordinateSequence;
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using geos::geom::Geometry;
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using geos::geom::GeometryFactory;
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using geos::geom::LineString;
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namespace geos { // geos.
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namespace operation { // geos.operation
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namespace buffer { // geos.operation.buffer
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/**
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* Models a section of a raw offset curve,
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* starting at a given location along the raw curve.
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* The location is a decimal number, with the integer part
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* containing the segment index and the fractional part
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* giving the fractional distance along the segment.
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* The location of the last section segment
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* is also kept, to allow optimizing joining sections together.
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*
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* @author mdavis
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*/
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class GEOS_DLL OffsetCurveSection {
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private:
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std::unique_ptr<CoordinateSequence> sectionPts;
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double location;
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double locLast;
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bool isEndInSameSegment(double nextLoc) const;
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public:
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OffsetCurveSection(std::unique_ptr<CoordinateSequence> && secPts, double pLoc, double pLocLast)
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: sectionPts(std::move(secPts))
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, location(pLoc)
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, locLast(pLocLast)
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{};
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const CoordinateSequence* getCoordinates() const;
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std::unique_ptr<CoordinateSequence> releaseCoordinates();
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double getLocation() const { return location; };
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/**
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* Joins section coordinates into a LineString.
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* Join vertices which lie in the same raw curve segment
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* are removed, to simplify the result linework.
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*
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* @param sections the sections to join
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* @param geomFactory the geometry factory to use
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* @return the simplified linestring for the joined sections
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*/
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static std::unique_ptr<Geometry> toLine(
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std::vector<std::unique_ptr<OffsetCurveSection>>& sections,
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const GeometryFactory* geomFactory);
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static std::unique_ptr<Geometry> toGeometry(
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std::vector<std::unique_ptr<OffsetCurveSection>>& sections,
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const GeometryFactory* geomFactory);
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static std::unique_ptr<OffsetCurveSection> create(
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const CoordinateSequence* srcPts,
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std::size_t start, std::size_t end,
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double loc, double locLast);
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static bool OffsetCurveSectionComparator(
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const std::unique_ptr<OffsetCurveSection>& a,
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const std::unique_ptr<OffsetCurveSection>& b);
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};
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} // namespace geos.operation.buffer
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} // namespace geos.operation
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} // namespace geos
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