90 lines
2.2 KiB
C
90 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) 2006 Refractions Research Inc.
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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 <cstddef>
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#include <geos/export.h>
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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 {
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namespace noding { // geos.noding
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/**
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* \brief
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* Processes possible intersections detected by a Noder.
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*
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* The SegmentIntersector is passed to a Noder.
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* The addIntersections method is called whenever the Noder
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* detects that two SegmentStrings <i>might</i> intersect.
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* This class may be used either to find all intersections, or
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* to detect the presence of an intersection. In the latter case,
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* Noders may choose to short-circuit their computation by calling the
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* isDone method.
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* This class is an example of the <i>Strategy</i> pattern.
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*
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* @version 1.7
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*/
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class GEOS_DLL SegmentIntersector {
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public:
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/**
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* This method is called by clients
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* of the SegmentIntersector interface to process
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* intersections for two segments of the SegmentStrings
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* being intersected.
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*/
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virtual void processIntersections(
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SegmentString* e0, std::size_t segIndex0,
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SegmentString* e1, std::size_t segIndex1) = 0;
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/**
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* \brief
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* Reports whether the client of this class
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* needs to continue testing all intersections in an arrangement.
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*
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* @return true if there is not need to continue testing segments
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*
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* The default implementation always return false (process all intersections).
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*/
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virtual bool
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isDone() const
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{
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return false;
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}
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virtual
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~SegmentIntersector()
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{ }
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protected:
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SegmentIntersector() {}
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};
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/// Temporary typedef for namespace transition
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typedef SegmentIntersector nodingSegmentIntersector;
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} // namespace geos.noding
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} // namespace geos
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