126 lines
3.2 KiB
C++
126 lines
3.2 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 Paul Ramsey <pramsey@cleverelephant.ca>
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* Copyright (C) 2021 Martin Davis
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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/geom/Coordinate.h>
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#include <geos/noding/SegmentIntersector.h>
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#include <geos/algorithm/LineIntersector.h>
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#include <geos/operation/valid/TopologyValidationError.h>
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#include <geos/export.h>
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#include <memory>
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// Forward declarations
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namespace geos {
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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 { // geos.
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namespace operation { // geos.operation
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namespace valid { // geos.operation.valid
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using geos::geom::CoordinateXY;
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using geos::noding::SegmentString;
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class GEOS_DLL PolygonIntersectionAnalyzer : public noding::SegmentIntersector {
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private:
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algorithm::LineIntersector li;
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bool m_hasDoubleTouch = false;
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bool isInvertedRingValid = false;
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int invalidCode = TopologyValidationError::oNoInvalidIntersection;
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CoordinateXY invalidLocation;
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CoordinateXY doubleTouchLocation;
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int findInvalidIntersection(
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const SegmentString* ss0, std::size_t segIndex0,
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const SegmentString* ss1, std::size_t segIndex1);
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bool addDoubleTouch(
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const SegmentString* ss0, const SegmentString* ss1,
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const CoordinateXY& intPt);
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void addSelfTouch(
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const SegmentString* ss, const CoordinateXY& intPt,
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const CoordinateXY* e00, const CoordinateXY* e01,
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const CoordinateXY* e10, const CoordinateXY* e11);
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const CoordinateXY& prevCoordinateInRing(
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const SegmentString* ringSS, std::size_t segIndex) const;
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bool isAdjacentInRing(const SegmentString* ringSS,
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std::size_t segIndex0, std::size_t segIndex1) const;
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public:
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/**
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* Creates a new finder, allowing for the mode where inverted rings are valid.
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*
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* @param isInvertedRingValid true if inverted rings are valid.
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*/
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PolygonIntersectionAnalyzer(bool p_isInvertedRingValid)
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: isInvertedRingValid(p_isInvertedRingValid)
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, invalidLocation(CoordinateXY::getNull())
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, doubleTouchLocation(CoordinateXY::getNull())
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{}
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void processIntersections(
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SegmentString* ss0, std::size_t segIndex0,
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SegmentString* ss1, std::size_t segIndex1) override;
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bool isDone() const override {
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return isInvalid() || m_hasDoubleTouch;
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};
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bool isInvalid() const
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{
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return invalidCode >= 0;
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};
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int getInvalidCode() const
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{
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return invalidCode;
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};
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const CoordinateXY& getInvalidLocation() const
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{
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return invalidLocation;
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};
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bool hasDoubleTouch() const
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{
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return m_hasDoubleTouch;
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};
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const CoordinateXY& getDoubleTouchLocation() const
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{
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return doubleTouchLocation;
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};
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};
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} // namespace geos.operation.valid
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} // namespace geos.operation
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} // namespace geos
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