277 lines
8.1 KiB
C
277 lines
8.1 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) 2011 Sandro Santilli <strk@kbt.io>
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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/LocationIndexedLine.java r466
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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/Coordinate.h>
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#include <geos/geom/Geometry.h>
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#include <geos/linearref/LinearLocation.h>
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#include <geos/linearref/LocationIndexOfPoint.h>
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#include <geos/linearref/LocationIndexOfLine.h>
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#include <geos/util/IllegalArgumentException.h>
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namespace geos {
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namespace linearref { // geos::linearref
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/**
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* \brief
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* Supports linear referencing along a linear
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* [Geometry](@ref geom::Geometry) using
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* [LinearLocations](@ref LinearLocation) as the index.
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*/
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class GEOS_DLL LocationIndexedLine {
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private:
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const geom::Geometry* linearGeom;
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void
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checkGeometryType()
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{
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if(!linearGeom->isLineal()) {
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throw util::IllegalArgumentException("Input geometry must be linear");
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}
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}
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public:
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/**
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* \brief
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* Constructs an object which allows linear referencing along
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* a given linear [Geometry](@ref geom::Geometry).
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*
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* @param p_linearGeom the linear geometry to reference along
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*/
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LocationIndexedLine(const geom::Geometry* p_linearGeom)
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: linearGeom(p_linearGeom)
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{
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checkGeometryType();
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}
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/**
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* \brief
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* Computes the [Coordinate](@ref geom::Coordinate) for the point
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* on the line at the given index.
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*
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* If the index is out of range the first or last point on the
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* line will be returned.
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* The Z-ordinate of the computed point will be interpolated from
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* the Z-ordinates of the line segment containing it, if they exist.
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*
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* @param index the index of the desired point
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* @return the Coordinate at the given index
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*/
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geom::Coordinate
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extractPoint(const LinearLocation& index) const
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{
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return index.getCoordinate(linearGeom);
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}
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/**
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* \brief
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* Computes the [Coordinate](@ref geom::Coordinate) for the point
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* on the line at the given index, offset by the given distance.
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*
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* If the index is out of range the first or last point on the
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* line will be returned.
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* The computed point is offset to the left of the line if the offset
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* distance is positive, to the right if negative.
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*
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* The Z-ordinate of the computed point will be interpolated from
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* the Z-ordinates of the line segment containing it, if they exist.
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*
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* @param index the index of the desired point
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* @param offsetDistance the distance the point is offset from the segment
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* (positive is to the left, negative is to the right)
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* @return the Coordinate at the given index
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*/
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geom::Coordinate
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extractPoint(const LinearLocation& index,
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double offsetDistance) const
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{
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geom::Coordinate ret;
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index.getSegment(linearGeom)->pointAlongOffset(
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index.getSegmentFraction(), offsetDistance, ret
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);
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return ret;
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}
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/**
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* \brief
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* Computes the [LineString](@ref geom::LineString) for the interval
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* on the line between the given indices.
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*
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* If the endIndex lies before the startIndex,
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* the computed geometry is reversed.
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*
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* @param startIndex the index of the start of the interval
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* @param endIndex the index of the end of the interval
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* @return the linear interval between the indices
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*/
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std::unique_ptr<geom::Geometry>
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extractLine(const LinearLocation& startIndex,
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const LinearLocation& endIndex) const
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{
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return ExtractLineByLocation::extract(linearGeom, startIndex, endIndex);
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}
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/**
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* \brief
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* Computes the index for a given point on the line.
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*
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* The supplied point does not <i>necessarily</i> have to lie precisely
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* on the line, but if it is far from the line the accuracy and
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* performance of this function is not guaranteed.
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* Use {@link #project} to compute a guaranteed result for points
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* which may be far from the line.
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*
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* @param pt a point on the line
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* @return the index of the point
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*
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* @see project
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*/
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LinearLocation
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indexOf(const geom::Coordinate& pt) const
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{
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return LocationIndexOfPoint::indexOf(linearGeom, pt);
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}
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/**
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* \brief
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* Finds the index for a point on the line
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* which is greater than the given index.
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*
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* If no such index exists, returns <tt>minIndex</tt>.
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* This method can be used to determine all indexes for
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* a point which occurs more than once on a non-simple line.
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* It can also be used to disambiguate cases where the given point lies
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* slightly off the line and is equidistant from two different
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* points on the line.
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*
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* The supplied point does not <i>necessarily</i> have to lie precisely
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* on the line, but if it is far from the line the accuracy and
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* performance of this function is not guaranteed.
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* Use {@link #project} to compute a guaranteed result for points
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* which may be far from the line.
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*
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* @param pt a point on the line
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* @param minIndex the value the returned index must be greater than
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* @return the index of the point greater than the given minimum index
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*
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* @see project
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*/
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LinearLocation
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indexOfAfter(const geom::Coordinate& pt,
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const LinearLocation& minIndex) const
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{
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return LocationIndexOfPoint::indexOfAfter(linearGeom, pt, &minIndex);
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}
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/**
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* \brief
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* Computes the indices for a subline of the line.
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*
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* (The subline must <b>conform</b> to the line; that is,
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* all vertices in the subline (except possibly the first and last)
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* must be vertices of the line and occur in the same order).
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*
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* @param subLine a subLine of the line
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* @return a pair of indices for the start and end of the subline.
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*/
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LinearLocation*
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indicesOf(const geom::Geometry* subLine) const
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{
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return LocationIndexOfLine::indicesOf(linearGeom, subLine);
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}
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/**
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* \brief
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* Computes the index for the closest point on the line to the given point.
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*
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* If more than one point has the closest distance the first one along
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* the line is returned.
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* (The point does not necessarily have to lie precisely on the line.)
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*
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* @param pt a point on the line
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* @return the index of the point
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*/
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LinearLocation
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project(const geom::Coordinate& pt) const
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{
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return LocationIndexOfPoint::indexOf(linearGeom, pt);
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}
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/**
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* \brief
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* Returns the index of the start of the line
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*
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* @return the start index
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*/
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LinearLocation
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getStartIndex() const
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{
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return LinearLocation();
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}
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/**
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* \brief
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* Returns the index of the end of the line
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*
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* @return the end index
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*/
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LinearLocation
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getEndIndex() const
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{
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return LinearLocation::getEndLocation(linearGeom);
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}
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/**
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* \brief
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* Tests whether an index is in the valid index range for the line.
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*
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* @param index the index to test
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* @return `true` if the index is in the valid range
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*/
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bool
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isValidIndex(const LinearLocation& index) const
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{
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return index.isValid(linearGeom);
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}
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/**
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* \brief
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* Computes a valid index for this line
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* by clamping the given index to the valid range of index values
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*
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* @return a valid index value
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*/
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LinearLocation
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clampIndex(const LinearLocation& index) const
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{
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LinearLocation loc = index;
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loc.clamp(linearGeom);
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return loc;
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}
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};
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} // geos::linearref
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} // geos
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