85 lines
2.0 KiB
C
85 lines
2.0 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) 2020 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/Envelope.h>
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#include <vector>
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#include <map>
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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 Geometry;
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class GeometryCollection;
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class Polygon;
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class LinearRing;
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}
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namespace operation {
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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 overlayng { // geos.operation.overlayng
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using namespace geos::geom;
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/**
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* Computes a robust clipping envelope for a pair of polygonal geometries.
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* The envelope is computed to be large enough to include the full
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* length of all geometry line segments which intersect
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* a given target envelope.
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* This ensures that line segments which might intersect are
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* not perturbed when clipped using {@link RingClipper}.
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* @author mdavis
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*/
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class GEOS_DLL RobustClipEnvelopeComputer {
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private:
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// Members
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const Envelope* targetEnv;
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Envelope clipEnv;
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// Methods
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void add(const Geometry* g);
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void addCollection(const GeometryCollection* gc);
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void addPolygon(const Polygon* poly);
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void addPolygonRing(const LinearRing* ring);
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void addSegment(const Coordinate& p1, const Coordinate& p2);
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bool intersectsSegment(const Envelope* env, const Coordinate& p1, const Coordinate& p2);
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public:
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RobustClipEnvelopeComputer(const Envelope* p_targetEnv);
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static Envelope getEnvelope(const Geometry* a, const Geometry* b, const Envelope* targetEnv);
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Envelope getEnvelope();
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};
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} // namespace geos.operation.overlayng
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} // namespace geos.operation
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} // namespace geos
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