QGIS API Documentation  3.21.0-Master (909859188c)
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1 /***************************************************************************
2  qgscircularstring.h
3  ---------------------
4  begin : September 2014
5  copyright : (C) 2014 by Marco Hugentobler
6  email : marco at sourcepole dot ch
7  ***************************************************************************/
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
21 #include <QVector>
23 #include "qgis_core.h"
24 #include "qgis_sip.h"
25 #include "qgscurve.h"
34 class CORE_EXPORT QgsCircularString: public QgsCurve
35 {
36  public:
49  QgsCircularString( const QgsPoint &p1,
50  const QgsPoint &p2,
51  const QgsPoint &p3 ) SIP_HOLDGIL;
68  QgsCircularString( const QVector<double> &x, const QVector<double> &y,
69  const QVector<double> &z = QVector<double>(),
70  const QVector<double> &m = QVector<double>() ) SIP_HOLDGIL;
83  static QgsCircularString fromTwoPointsAndCenter( const QgsPoint &p1,
84  const QgsPoint &p2,
85  const QgsPoint &center,
86  bool useShortestArc = true );
88  bool equals( const QgsCurve &other ) const override;
90  QString geometryType() const override SIP_HOLDGIL;
91  int dimension() const override SIP_HOLDGIL;
92  QgsCircularString *clone() const override SIP_FACTORY;
93  void clear() override;
95  bool fromWkb( QgsConstWkbPtr &wkb ) override;
96  bool fromWkt( const QString &wkt ) override;
98  int wkbSize( QgsAbstractGeometry::WkbFlags flags = QgsAbstractGeometry::WkbFlags() ) const override;
99  QByteArray asWkb( QgsAbstractGeometry::WkbFlags flags = QgsAbstractGeometry::WkbFlags() ) const override;
100  QString asWkt( int precision = 17 ) const override;
101  QDomElement asGml2( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
102  QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
103  json asJsonObject( int precision = 17 ) const override SIP_SKIP;
104  bool isEmpty() const override SIP_HOLDGIL;
105  bool isValid( QString &error SIP_OUT, Qgis::GeometryValidityFlags flags = Qgis::GeometryValidityFlags() ) const override;
106  int numPoints() const override SIP_HOLDGIL;
107  int indexOf( const QgsPoint &point ) const final;
112  QgsPoint pointN( int i ) const SIP_HOLDGIL;
114  void points( QgsPointSequence &pts SIP_OUT ) const override;
119  void setPoints( const QgsPointSequence &points );
131  void append( const QgsCircularString *string );
133  double length() const override;
134  QgsPoint startPoint() const override SIP_HOLDGIL;
135  QgsPoint endPoint() const override SIP_HOLDGIL;
136  QgsLineString *curveToLine( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const override SIP_FACTORY;
137  QgsCircularString *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const override SIP_FACTORY;
138  bool removeDuplicateNodes( double epsilon = 4 * std::numeric_limits<double>::epsilon(), bool useZValues = false ) override;
140  void draw( QPainter &p ) const override;
142  void transform( const QTransform &t, double zTranslate = 0.0, double zScale = 1.0, double mTranslate = 0.0, double mScale = 1.0 ) override;
143  void addToPainterPath( QPainterPath &path ) const override;
144  void drawAsPolygon( QPainter &p ) const override;
145  bool insertVertex( QgsVertexId position, const QgsPoint &vertex ) override;
146  bool moveVertex( QgsVertexId position, const QgsPoint &newPos ) override;
147  bool deleteVertex( QgsVertexId position ) override;
148  double closestSegment( const QgsPoint &pt, QgsPoint &segmentPt SIP_OUT, QgsVertexId &vertexAfter SIP_OUT, int *leftOf SIP_OUT = nullptr, double epsilon = 4 * std::numeric_limits<double>::epsilon() ) const override;
149  bool pointAt( int node, QgsPoint &point, QgsVertexId::VertexType &type ) const override;
150  void sumUpArea( double &sum SIP_OUT ) const override;
151  bool hasCurvedSegments() const override;
152  double vertexAngle( QgsVertexId vertex ) const override;
153  double segmentLength( QgsVertexId startVertex ) const override;
154  QgsCircularString *reversed() const override SIP_FACTORY;
155  QgsPoint *interpolatePoint( double distance ) const override SIP_FACTORY;
156  QgsCircularString *curveSubstring( double startDistance, double endDistance ) const override SIP_FACTORY;
157  bool addZValue( double zValue = 0 ) override;
158  bool addMValue( double mValue = 0 ) override;
159  bool dropZValue() override;
160  bool dropMValue() override;
161  void swapXy() override;
162  double xAt( int index ) const override SIP_HOLDGIL;
163  double yAt( int index ) const override SIP_HOLDGIL;
165  bool transform( QgsAbstractGeometryTransformer *transformer, QgsFeedback *feedback = nullptr ) override;
166  void scroll( int firstVertexIndex ) final;
168 #ifndef SIP_RUN
169  void filterVertices( const std::function< bool( const QgsPoint & ) > &filter ) override;
170  void transformVertices( const std::function< QgsPoint( const QgsPoint & ) > &transform ) override;
171  std::tuple< std::unique_ptr< QgsCurve >, std::unique_ptr< QgsCurve > > splitCurveAtVertex( int index ) const final;
180  inline static const QgsCircularString *cast( const QgsAbstractGeometry *geom )
181  {
182  if ( geom && QgsWkbTypes::flatType( geom->wkbType() ) == QgsWkbTypes::CircularString )
183  return static_cast<const QgsCircularString *>( geom );
184  return nullptr;
185  }
186 #endif
190 #ifdef SIP_RUN
191  SIP_PYOBJECT __repr__();
192  % MethodCode
193  QString wkt = sipCpp->asWkt();
194  if ( wkt.length() > 1000 )
195  wkt = wkt.left( 1000 ) + QStringLiteral( "..." );
196  QString str = QStringLiteral( "<QgsCircularString: %1>" ).arg( wkt );
197  sipRes = PyUnicode_FromString( str.toUtf8().constData() );
198  % End
199 #endif
201  protected:
203  int compareToSameClass( const QgsAbstractGeometry *other ) const final;
204  QgsRectangle calculateBoundingBox() const override;
206  private:
207  QVector<double> mX;
208  QVector<double> mY;
209  QVector<double> mZ;
210  QVector<double> mM;
212 #if 0
213  static void arcTo( QPainterPath &path, QPointF pt1, QPointF pt2, QPointF pt3 );
214 #endif
215  //bounding box of a single segment
216  static QgsRectangle segmentBoundingBox( const QgsPoint &pt1, const QgsPoint &pt2, const QgsPoint &pt3 );
217  static QgsPointSequence compassPointsOnSegment( double p1Angle, double p2Angle, double p3Angle, double centerX, double centerY, double radius );
218  static double closestPointOnArc( double x1, double y1, double x2, double y2, double x3, double y3,
219  const QgsPoint &pt, QgsPoint &segmentPt, QgsVertexId &vertexAfter, int *leftOf, double epsilon );
220  void insertVertexBetween( int after, int before, int pointOnCircle );
221  void deleteVertex( int i );
223 };
225 // clazy:excludeall=qstring-allocations
An abstract base class for classes which transform geometries by transforming input points to output ...
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 fromWkb(QgsConstWkbPtr &wkb)=0
Sets the geometry from a WKB string.
virtual bool moveVertex(QgsVertexId position, const QgsPoint &newPos)=0
Moves a vertex within the geometry.
Segmentation tolerance as maximum angle or maximum difference between approximation and circle.
virtual double vertexAngle(QgsVertexId vertex) const =0
Returns approximate angle at a vertex.
virtual bool dropMValue()=0
Drops any measure values which exist in the geometry.
virtual void draw(QPainter &p) const =0
Draws the geometry using the specified QPainter.
virtual QgsRectangle calculateBoundingBox() const
Default calculator for the minimal bounding box for the geometry.
virtual void transformVertices(const std::function< QgsPoint(const QgsPoint &) > &transform)
Transforms the vertices from the geometry in place, applying the transform function to every vertex.
Axis order for GML generation.
virtual QString geometryType() const =0
Returns a unique string representing the geometry type.
virtual QgsAbstractGeometry * createEmptyWithSameType() const =0
Creates a new geometry with the same class and same WKB type as the original and transfers ownership.
virtual QByteArray asWkb(WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const =0
Returns a WKB representation of the geometry.
virtual QDomElement asGml2(QDomDocument &doc, int precision=17, const QString &ns="gml", AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const =0
Returns a GML2 representation of the geometry.
virtual bool addMValue(double mValue=0)=0
Adds a measure to the geometry, initialized to a preset value.
virtual QgsAbstractGeometry * snappedToGrid(double hSpacing, double vSpacing, double dSpacing=0, double mSpacing=0) const =0
Makes a new geometry with all the points or vertices snapped to the closest point of the grid.
virtual bool insertVertex(QgsVertexId position, const QgsPoint &vertex)=0
Inserts a vertex into the geometry.
virtual void swapXy()=0
Swaps the x and y coordinates from the geometry.
virtual void transform(const QgsCoordinateTransform &ct, QgsCoordinateTransform::TransformDirection d=QgsCoordinateTransform::ForwardTransform, bool transformZ=false) SIP_THROW(QgsCsException)=0
Transforms the geometry using a coordinate transform.
virtual double length() const
Returns the planar, 2-dimensional length of the geometry.
virtual QString asWkt(int precision=17) const =0
Returns a WKT representation of the geometry.
virtual bool isEmpty() const
Returns true if the geometry is empty.
virtual json asJsonObject(int precision=17) const
Returns a json object representation of the geometry.
virtual QDomElement asGml3(QDomDocument &doc, int precision=17, const QString &ns="gml", AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const =0
Returns a GML3 representation of the geometry.
virtual bool fromWkt(const QString &wkt)=0
Sets the geometry from a WKT string.
virtual bool deleteVertex(QgsVertexId position)=0
Deletes a vertex within the geometry.
virtual bool hasCurvedSegments() const
Returns true if the geometry contains curved segments.
virtual void clear()=0
Clears the geometry, ie reset it to a null geometry.
virtual void filterVertices(const std::function< bool(const QgsPoint &) > &filter)
Filters the vertices from the geometry in place, removing any which do not return true for the filter...
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.
virtual int dimension() const =0
Returns the inherent dimension of the geometry.
virtual double segmentLength(QgsVertexId startVertex) const =0
Returns the length of the segment of the geometry which begins at startVertex.
virtual bool removeDuplicateNodes(double epsilon=4 *std::numeric_limits< double >::epsilon(), bool useZValues=false)=0
Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerat...
virtual int wkbSize(QgsAbstractGeometry::WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const =0
Returns the length of the QByteArray returned by asWkb()
virtual int compareToSameClass(const QgsAbstractGeometry *other) const =0
Compares to an other geometry of the same class, and returns a integer for sorting of the two geometr...
virtual double closestSegment(const QgsPoint &pt, QgsPoint &segmentPt, QgsVertexId &vertexAfter, int *leftOf=nullptr, double epsilon=4 *std::numeric_limits< double >::epsilon()) const =0
Searches for the closest segment of the geometry to a given point.
Circular string geometry type.
static const QgsCircularString * cast(const QgsAbstractGeometry *geom)
Cast the geom to a QgsCircularString.
A const WKB pointer.
Definition: qgswkbptr.h:138
Class for doing transforms between two map coordinate systems.
Enum used to indicate the direction (forward or inverse) of the transform.
@ ForwardTransform
Transform from source to destination CRS.
Custom exception class for Coordinate Reference System related exceptions.
Definition: qgsexception.h:66
Abstract base class for curved geometry type.
Definition: qgscurve.h:36
virtual bool equals(const QgsCurve &other) const =0
Checks whether this curve exactly equals another curve.
virtual int numPoints() const =0
Returns the number of points in the curve.
virtual void scroll(int firstVertexIndex)=0
Scrolls the curve vertices so that they start with the vertex at the given index.
virtual QgsPoint * interpolatePoint(double distance) const =0
Returns an interpolated point on the curve at the specified distance.
bool isValid(QString &error, Qgis::GeometryValidityFlags flags=Qgis::GeometryValidityFlags()) const override
Checks validity of the geometry, and returns true if the geometry is valid.
Definition: qgscurve.cpp:246
virtual QgsLineString * curveToLine(double tolerance=M_PI_2/90, SegmentationToleranceType toleranceType=MaximumAngle) const =0
Returns a new line string geometry corresponding to a segmentized approximation of the curve.
virtual void addToPainterPath(QPainterPath &path) const =0
Adds a curve to a painter path.
virtual int indexOf(const QgsPoint &point) const =0
Returns the index of the first vertex matching the given point, or -1 if a matching vertex is not fou...
virtual void sumUpArea(double &sum) const =0
Sums up the area of the curve by iterating over the vertices (shoelace formula).
QgsCurve * clone() const override=0
Clones the geometry by performing a deep copy.
virtual double xAt(int index) const =0
Returns the x-coordinate of the specified node in the line string.
virtual QgsCurve * curveSubstring(double startDistance, double endDistance) const =0
Returns a new curve representing a substring of this curve.
virtual QgsPoint startPoint() const =0
Returns the starting point of the curve.
virtual std::tuple< std::unique_ptr< QgsCurve >, std::unique_ptr< QgsCurve > > splitCurveAtVertex(int index) const =0
Splits the curve at the specified vertex index, returning two curves which represent the portion of t...
virtual bool pointAt(int node, QgsPoint &point, QgsVertexId::VertexType &type) const =0
Returns the point and vertex id of a point within the curve.
virtual void drawAsPolygon(QPainter &p) const =0
Draws the curve as a polygon on the specified QPainter.
virtual QgsPoint endPoint() const =0
Returns the end point of the curve.
virtual double yAt(int index) const =0
Returns the y-coordinate of the specified node in the line string.
virtual QgsCurve * reversed() const =0
Returns a reversed copy of the curve, where the direction of the curve has been flipped.
virtual void points(QgsPointSequence &pt) const =0
Returns a list of points within the curve.
Base class for feedback objects to be used for cancellation of something running in a worker thread.
Definition: qgsfeedback.h:45
Line string geometry type, with support for z-dimension and m-values.
Definition: qgslinestring.h:44
Point geometry type, with support for z-dimension and m-values.
Definition: qgspoint.h:49
A rectangle specified with double values.
Definition: qgsrectangle.h:42
static Type flatType(Type type) SIP_HOLDGIL
Returns the flat type for a WKB type.
Definition: qgswkbtypes.h:702
double ANALYSIS_EXPORT leftOf(const QgsPoint &thepoint, const QgsPoint *p1, const QgsPoint *p2)
Returns whether 'thepoint' is left or right of the line from 'p1' to 'p2'. Negative values mean left ...
Definition: MathUtils.cpp:292
#define str(x)
Definition: qgis.cpp:37
#define SIP_THROW(name)
Definition: qgis_sip.h:189
#define SIP_SKIP
Definition: qgis_sip.h:126
#define SIP_OUT
Definition: qgis_sip.h:58
Definition: qgis_sip.h:157
Definition: qgis_sip.h:76
QVector< QgsPoint > QgsPointSequence
int precision
Utility class for identifying a unique vertex within a geometry.
Type of vertex.