QGIS API Documentation 3.27.0-Master (75dc696944)
qgsmultilinestring.cpp
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1/***************************************************************************
2 qgsmultilinestring.cpp
3 -------------------------------------------------------------------
4Date : 28 Oct 2014
5Copyright : (C) 2014 by Marco Hugentobler
6email : marco.hugentobler at sourcepole dot com
7 ***************************************************************************
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 ***************************************************************************/
15
16#include "qgsmultilinestring.h"
17#include "qgsapplication.h"
18#include "qgscurve.h"
19#include "qgscircularstring.h"
20#include "qgscompoundcurve.h"
21#include "qgsgeometryutils.h"
22#include "qgslinestring.h"
23#include "qgsmulticurve.h"
24
25#include <nlohmann/json.hpp>
26#include <QJsonObject>
27
29{
31}
32
34{
35 return qgsgeometry_cast< QgsLineString * >( geometryN( index ) );
36}
37
39{
40 return qgsgeometry_cast< const QgsLineString * >( geometryN( index ) );
41}
42
44{
45 return QStringLiteral( "MultiLineString" );
46}
47
49{
50 auto result = std::make_unique< QgsMultiLineString >();
51 result->mWkbType = mWkbType;
52 return result.release();
53}
54
56{
57 return new QgsMultiLineString( *this );
58}
59
61{
64}
65
66bool QgsMultiLineString::fromWkt( const QString &wkt )
67{
68 return fromCollectionWkt( wkt, QVector<QgsAbstractGeometry *>() << new QgsLineString, QStringLiteral( "LineString" ) );
69}
70
71QDomElement QgsMultiLineString::asGml2( QDomDocument &doc, int precision, const QString &ns, const AxisOrder axisOrder ) const
72{
73 QDomElement elemMultiLineString = doc.createElementNS( ns, QStringLiteral( "MultiLineString" ) );
74
75 if ( isEmpty() )
76 return elemMultiLineString;
77
78 for ( const QgsAbstractGeometry *geom : mGeometries )
79 {
80 if ( const QgsLineString *lineString = qgsgeometry_cast<const QgsLineString *>( geom ) )
81 {
82 QDomElement elemLineStringMember = doc.createElementNS( ns, QStringLiteral( "lineStringMember" ) );
83 elemLineStringMember.appendChild( lineString->asGml2( doc, precision, ns, axisOrder ) );
84 elemMultiLineString.appendChild( elemLineStringMember );
85 }
86 }
87
88 return elemMultiLineString;
89}
90
91QDomElement QgsMultiLineString::asGml3( QDomDocument &doc, int precision, const QString &ns, const QgsAbstractGeometry::AxisOrder axisOrder ) const
92{
93 QDomElement elemMultiCurve = doc.createElementNS( ns, QStringLiteral( "MultiCurve" ) );
94
95 if ( isEmpty() )
96 return elemMultiCurve;
97
98 for ( const QgsAbstractGeometry *geom : mGeometries )
99 {
100 if ( const QgsLineString *lineString = qgsgeometry_cast<const QgsLineString *>( geom ) )
101 {
102 QDomElement elemCurveMember = doc.createElementNS( ns, QStringLiteral( "curveMember" ) );
103 elemCurveMember.appendChild( lineString->asGml3( doc, precision, ns, axisOrder ) );
104 elemMultiCurve.appendChild( elemCurveMember );
105 }
106 }
107
108 return elemMultiCurve;
109}
110
112{
113 json coordinates( json::array( ) );
114 for ( const QgsAbstractGeometry *geom : mGeometries )
115 {
116 if ( qgsgeometry_cast<const QgsCurve *>( geom ) )
117 {
118 const QgsLineString *lineString = static_cast<const QgsLineString *>( geom );
120 lineString->points( pts );
121 coordinates.push_back( QgsGeometryUtils::pointsToJson( pts, precision ) );
122 }
123 }
124 return
125 {
126 { "type", "MultiLineString" },
127 { "coordinates", coordinates }
128 };
129}
130
132{
133 if ( !dynamic_cast<QgsLineString *>( g ) )
134 {
135 delete g;
136 return false;
137 }
138
139 if ( mGeometries.empty() )
140 {
142 }
143 if ( is3D() && !g->is3D() )
144 g->addZValue();
145 else if ( !is3D() && g->is3D() )
146 g->dropZValue();
147 if ( isMeasure() && !g->isMeasure() )
148 g->addMValue();
149 else if ( !isMeasure() && g->isMeasure() )
150 g->dropMValue();
151 return QgsGeometryCollection::addGeometry( g ); // clazy:exclude=skipped-base-method
152}
153
155{
157 {
158 delete g;
159 return false;
160 }
161
162 return QgsMultiCurve::insertGeometry( g, index ); // clazy:exclude=skipped-base-method
163}
164
166{
167 QgsMultiCurve *multiCurve = new QgsMultiCurve();
168 multiCurve->reserve( mGeometries.size() );
169 for ( int i = 0; i < mGeometries.size(); ++i )
170 {
171 multiCurve->addGeometry( mGeometries.at( i )->toCurveType() );
172 }
173 return multiCurve;
174}
175
177{
178 return true;
179}
180
Abstract base class for all geometries.
virtual bool addZValue(double zValue=0)=0
Adds a z-dimension to the geometry, initialized to a preset value.
virtual bool dropMValue()=0
Drops any measure values which exist in the geometry.
bool is3D() const SIP_HOLDGIL
Returns true if the geometry is 3D and contains a z-value.
AxisOrder
Axis order for GML generation.
virtual bool addMValue(double mValue=0)=0
Adds a measure to the geometry, initialized to a preset value.
QgsWkbTypes::Type wkbType() const SIP_HOLDGIL
Returns the WKB type of the geometry.
virtual bool dropZValue()=0
Drops any z-dimensions which exist in the geometry.
QgsWkbTypes::Type mWkbType
bool isMeasure() const SIP_HOLDGIL
Returns true if the geometry contains m values.
void setZMTypeFromSubGeometry(const QgsAbstractGeometry *subggeom, QgsWkbTypes::Type baseGeomType)
Updates the geometry type based on whether sub geometries contain z or m values.
bool isEmpty() const override SIP_HOLDGIL
Returns true if the geometry is empty.
QVector< QgsAbstractGeometry * > mGeometries
void reserve(int size) SIP_HOLDGIL
Attempts to allocate memory for at least size geometries.
virtual bool addGeometry(QgsAbstractGeometry *g)
Adds a geometry and takes ownership. Returns true in case of success.
bool fromCollectionWkt(const QString &wkt, const QVector< QgsAbstractGeometry * > &subtypes, const QString &defaultChildWkbType=QString())
Reads a collection from a WKT string.
const QgsAbstractGeometry * geometryN(int n) const
Returns a const reference to a geometry from within the collection.
static json pointsToJson(const QgsPointSequence &points, int precision)
Returns coordinates as json object.
Line string geometry type, with support for z-dimension and m-values.
Definition: qgslinestring.h:45
void points(QgsPointSequence &pt) const override
Returns a list of points within the curve.
Multi curve geometry collection.
Definition: qgsmulticurve.h:30
bool insertGeometry(QgsAbstractGeometry *g, int index) override
Inserts a geometry before a specified index and takes ownership.
bool addGeometry(QgsAbstractGeometry *g) override
Adds a geometry and takes ownership. Returns true in case of success.
void clear() override
Clears the geometry, ie reset it to a null geometry.
Multi line string geometry collection.
void clear() override
Clears the geometry, ie reset it to a null geometry.
QString geometryType() const override SIP_HOLDGIL
Returns a unique string representing the geometry type.
QgsMultiCurve * toCurveType() const override
Returns the geometry converted to the more generic curve type QgsMultiCurve.
bool wktOmitChildType() const override
Returns whether child type names are omitted from Wkt representations of the collection.
bool fromWkt(const QString &wkt) override
Sets the geometry from a WKT string.
bool insertGeometry(QgsAbstractGeometry *g, int index) override
Inserts a geometry before a specified index and takes ownership.
json asJsonObject(int precision=17) const override
Returns a json object representation of the geometry.
QDomElement asGml3(QDomDocument &doc, int precision=17, const QString &ns="gml", QgsAbstractGeometry::AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const override
Returns a GML3 representation of the geometry.
QgsMultiLineString() SIP_HOLDGIL
Constructor for an empty multilinestring geometry.
QgsMultiLineString * clone() const override
Clones the geometry by performing a deep copy.
QgsMultiLineString * createEmptyWithSameType() const override
Creates a new geometry with the same class and same WKB type as the original and transfers ownership.
bool addGeometry(QgsAbstractGeometry *g) override
Adds a geometry and takes ownership. Returns true in case of success.
QDomElement asGml2(QDomDocument &doc, int precision=17, const QString &ns="gml", QgsAbstractGeometry::AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const override
Returns a GML2 representation of the geometry.
QgsLineString * lineStringN(int index)
Returns the line string with the specified index.
static Type flatType(Type type) SIP_HOLDGIL
Returns the flat type for a WKB type.
Definition: qgswkbtypes.h:732
QVector< QgsPoint > QgsPointSequence
int precision