QGIS API Documentation  3.21.0-Master (56b4176581)
qgsmultilinestring.cpp
Go to the documentation of this file.
1 /***************************************************************************
2  qgsmultilinestring.cpp
3  -------------------------------------------------------------------
4 Date : 28 Oct 2014
5 Copyright : (C) 2014 by Marco Hugentobler
6 email : 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 
66 bool QgsMultiLineString::fromWkt( const QString &wkt )
67 {
68  return fromCollectionWkt( wkt, QVector<QgsAbstractGeometry *>() << new QgsLineString, QStringLiteral( "LineString" ) );
69 }
70 
71 QDomElement 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 
91 QDomElement 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 );
119  QgsPointSequence pts;
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.
const QgsAbstractGeometry * geometryN(int n) const
Returns a const reference to a geometry from within the collection.
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.
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:44
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:702
QVector< QgsPoint > QgsPointSequence
int precision