89 lines
2.2 KiB
C
89 lines
2.2 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 <geos/geom/Coordinate.h>
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#include <geos/geom/Envelope.h>
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#include <geos/noding/Noder.h>
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#include <geos/noding/snap/SnappingPointIndex.h>
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// Forward declarations
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namespace geos {
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namespace geom {
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class Envelope;
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class PrecisionModel;
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}
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namespace noding {
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class SegmentString;
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}
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}
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namespace geos {
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namespace noding { // geos::noding
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/**
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* A noder which extracts all line segments
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* as SegmentString.
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* This enables fast overlay of geometries which are known to be already fully noded.
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* In particular, it provides fast union of polygonal and linear coverages.
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* Unioning a noded set of lines is an effective way
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* to perform line merging and line dissolving.
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*
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* No precision reduction is carried out.
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* If that is required, another noder must be used (such as a snap-rounding noder),
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* or the input must be precision-reduced beforehand.
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*
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*/
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class GEOS_DLL SegmentExtractingNoder : public Noder {
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private:
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std::vector<SegmentString*>* segList;
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void extractSegments(
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const std::vector<SegmentString*>& inputSegs,
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std::vector<SegmentString*>& outputSegs);
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void extractSegments(
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const SegmentString* ss,
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std::vector<SegmentString*>& outputSegs);
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public:
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/**
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* Creates a new segment-extracting noder.
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*/
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SegmentExtractingNoder() : segList(nullptr)
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{};
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void computeNodes(std::vector<SegmentString*>* segStrings) override;
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/**
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* @return a Collection of SegmentString representing the
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* substrings. Caller takes ownership over vector and contents.
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*/
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std::vector<SegmentString*>* getNodedSubstrings() const override;
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};
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} // namespace geos::noding
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} // namespace geos
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