89 lines
2.6 KiB
C
89 lines
2.6 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) 2005-2006 Refractions Research Inc.
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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: linearref/ExtractLineByLocation.java rev. 1.10
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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/geom/Geometry.h>
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#include <geos/linearref/LinearLocation.h>
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namespace geos {
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namespace linearref { // geos::linearref
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/** \brief
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* Extracts the subline of a linear [Geometry](@ref geom::Geometry) between
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* two {@link LinearLocation}s on the line.
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*/
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class ExtractLineByLocation {
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private:
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const geom::Geometry* line;
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std::unique_ptr<geom::Geometry> reverse(const geom::Geometry* linear);
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/**
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* Assumes input is valid (e.g. start <= end)
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*
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* @param start
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* @param end
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* @return a linear geometry
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*/
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std::unique_ptr<geom::LineString> computeLine(const LinearLocation& start, const LinearLocation& end);
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/**
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* Assumes input is valid (e.g. start <= end)
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*
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* @param start
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* @param end
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* @return a linear geometry
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*/
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std::unique_ptr<geom::Geometry> computeLinear(const LinearLocation& start, const LinearLocation& end);
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public:
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/** \brief
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* Computes the subline of a [LineString](@ref geom::LineString) between
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* two {@link LinearLocation}s on the line.
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*
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* If the start location is after the end location,
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* the computed geometry is reversed.
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*
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* @param line the line to use as the baseline
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* @param start the start location
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* @param end the end location
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* @return the extracted subline
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*/
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static std::unique_ptr<geom::Geometry> extract(const geom::Geometry* line, const LinearLocation& start, const LinearLocation& end);
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ExtractLineByLocation(const geom::Geometry* line);
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/** \brief
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* Extracts a subline of the input.
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*
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* If `end < start` the linear geometry computed will be reversed.
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*
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* @param start the start location
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* @param end the end location
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* @return a linear geometry
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*/
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std::unique_ptr<geom::Geometry> extract(const LinearLocation& start, const LinearLocation& end);
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};
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}
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}
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