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115 lines
3.3 KiB
C++
115 lines
3.3 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) 2001-2002 Vivid Solutions 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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*
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* Last port: index/chain/MonotoneChainBuilder.java r388 (JTS-1.12)
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*
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**********************************************************************/
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#ifndef GEOS_IDX_CHAIN_MONOTONECHAINBUILDER_H
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#define GEOS_IDX_CHAIN_MONOTONECHAINBUILDER_H
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#include <geos/export.h>
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#include <memory>
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#include <vector>
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#include <cstddef>
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// Forward declarations
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namespace geos {
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namespace geom {
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class CoordinateSequence;
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}
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namespace index {
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namespace chain {
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class MonotoneChain;
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}
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}
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}
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namespace geos {
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namespace index { // geos::index
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namespace chain { // geos::index::chain
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/** \brief
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* Constructs [MonotoneChains](@ref index::chain::MonotoneChain)
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* for sequences of [Coordinates](@ref geom::Coordinate).
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*
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* TODO: use vector<const Coordinate*> instead ?
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*/
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class GEOS_DLL MonotoneChainBuilder {
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public:
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MonotoneChainBuilder() {}
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/** \brief
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* Return a newly-allocated vector of newly-allocated
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* MonotoneChain objects for the given CoordinateSequence.
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*/
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static std::unique_ptr<std::vector<std::unique_ptr<MonotoneChain>>> getChains(
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const geom::CoordinateSequence* pts,
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void* context);
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/** \brief
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* Computes a list of the {@link MonotoneChain}s for a list of coordinates,
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* attaching a context data object to each.
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*
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* @param pts the list of points to compute chains for
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* @param context a data object to attach to each chain
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* @param[out] mcList a list of the monotone chains for the points
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*/
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static void getChains(const geom::CoordinateSequence* pts,
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void* context,
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std::vector<std::unique_ptr<MonotoneChain>>& mcList);
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static std::unique_ptr<std::vector<std::unique_ptr<MonotoneChain>>>
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getChains(const geom::CoordinateSequence* pts)
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{
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return getChains(pts, nullptr);
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}
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/**
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* Disable copy construction and assignment. Apparently needed to make this
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* class compile under MSVC. (See https://stackoverflow.com/q/29565299)
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*/
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MonotoneChainBuilder(const MonotoneChainBuilder&) = delete;
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MonotoneChainBuilder& operator=(const MonotoneChainBuilder&) = delete;
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private:
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/** \brief
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* Finds the index of the last point in a monotone chain
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* starting at a given point.
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*
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* Repeated points (0-length segments) are included
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* in the monotone chain returned.
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*
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* @param pts the points to scan
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* @param start the index of the start of this chain
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* @return the index of the last point in the monotone chain
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* starting at <code>start</code>.
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*
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* @note aborts if 'start' is >= pts.getSize()
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*/
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static std::size_t findChainEnd(const geom::CoordinateSequence& pts,
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std::size_t start);
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};
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} // namespace geos::index::chain
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} // namespace geos::index
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} // namespace geos
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#endif // GEOS_IDX_CHAIN_MONOTONECHAINBUILDER_H
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