QGIS API Documentation  3.10.0-A Coruña (6c816b4204)
Go to the documentation of this file.
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 );
63  static QgsCircularString fromTwoPointsAndCenter( const QgsPoint &p1,
64  const QgsPoint &p2,
65  const QgsPoint &center,
66  bool useShortestArc = true );
68  bool equals( const QgsCurve &other ) const override;
70  QString geometryType() const override;
71  int dimension() const override;
72  QgsCircularString *clone() const override SIP_FACTORY;
73  void clear() override;
75  bool fromWkb( QgsConstWkbPtr &wkb ) override;
76  bool fromWkt( const QString &wkt ) override;
78  QByteArray asWkb() const override;
79  QString asWkt( int precision = 17 ) const override;
80  QDomElement asGml2( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
81  QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
82  json asJsonObject( int precision = 17 ) const override SIP_SKIP;
83  bool isEmpty() const override;
84  int numPoints() const override;
89  QgsPoint pointN( int i ) const;
91  void points( QgsPointSequence &pts SIP_OUT ) const override;
96  void setPoints( const QgsPointSequence &points );
98  double length() const override;
99  QgsPoint startPoint() const override;
100  QgsPoint endPoint() const override;
101  QgsLineString *curveToLine( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const override SIP_FACTORY;
102  QgsCircularString *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const override SIP_FACTORY;
103  bool removeDuplicateNodes( double epsilon = 4 * std::numeric_limits<double>::epsilon(), bool useZValues = false ) override;
105  void draw( QPainter &p ) const override;
107  void transform( const QTransform &t, double zTranslate = 0.0, double zScale = 1.0, double mTranslate = 0.0, double mScale = 1.0 ) override;
108  void addToPainterPath( QPainterPath &path ) const override;
109  void drawAsPolygon( QPainter &p ) const override;
110  bool insertVertex( QgsVertexId position, const QgsPoint &vertex ) override;
111  bool moveVertex( QgsVertexId position, const QgsPoint &newPos ) override;
112  bool deleteVertex( QgsVertexId position ) override;
113  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;
114  bool pointAt( int node, QgsPoint &point, QgsVertexId::VertexType &type ) const override;
115  void sumUpArea( double &sum SIP_OUT ) const override;
116  bool hasCurvedSegments() const override;
117  double vertexAngle( QgsVertexId vertex ) const override;
118  double segmentLength( QgsVertexId startVertex ) const override;
119  QgsCircularString *reversed() const override SIP_FACTORY;
120  QgsPoint *interpolatePoint( double distance ) const override SIP_FACTORY;
121  QgsCircularString *curveSubstring( double startDistance, double endDistance ) const override SIP_FACTORY;
122  bool addZValue( double zValue = 0 ) override;
123  bool addMValue( double mValue = 0 ) override;
124  bool dropZValue() override;
125  bool dropMValue() override;
126  void swapXy() override;
127  double xAt( int index ) const override;
128  double yAt( int index ) const override;
130 #ifndef SIP_RUN
131  void filterVertices( const std::function< bool( const QgsPoint & ) > &filter ) override;
132  void transformVertices( const std::function< QgsPoint( const QgsPoint & ) > &transform ) override;
141  inline const QgsCircularString *cast( const QgsAbstractGeometry *geom ) const
142  {
143  if ( geom && QgsWkbTypes::flatType( geom->wkbType() ) == QgsWkbTypes::CircularString )
144  return static_cast<const QgsCircularString *>( geom );
145  return nullptr;
146  }
147 #endif
151 #ifdef SIP_RUN
152  SIP_PYOBJECT __repr__();
153  % MethodCode
154  QString wkt = sipCpp->asWkt();
155  if ( wkt.length() > 1000 )
156  wkt = wkt.left( 1000 ) + QStringLiteral( "..." );
157  QString str = QStringLiteral( "<QgsCircularString: %1>" ).arg( wkt );
158  sipRes = PyUnicode_FromString( str.toUtf8().constData() );
159  % End
160 #endif
162  protected:
164  QgsRectangle calculateBoundingBox() const override;
166  private:
167  QVector<double> mX;
168  QVector<double> mY;
169  QVector<double> mZ;
170  QVector<double> mM;
172 #if 0
173  static void arcTo( QPainterPath &path, QPointF pt1, QPointF pt2, QPointF pt3 );
174 #endif
175  //bounding box of a single segment
176  static QgsRectangle segmentBoundingBox( const QgsPoint &pt1, const QgsPoint &pt2, const QgsPoint &pt3 );
177  static QgsPointSequence compassPointsOnSegment( double p1Angle, double p2Angle, double p3Angle, double centerX, double centerY, double radius );
178  static double closestPointOnArc( double x1, double y1, double x2, double y2, double x3, double y3,
179  const QgsPoint &pt, QgsPoint &segmentPt, QgsVertexId &vertexAfter, int *leftOf, double epsilon );
180  void insertVertexBetween( int after, int before, int pointOnCircle );
181  void deleteVertex( int i );
183 };
185 // clazy:excludeall=qstring-allocations
virtual QgsCurve * reversed() const =0
Returns a reversed copy of the curve, where the direction of the curve has been flipped.
virtual QString asWkt(int precision=17) const =0
Returns a WKT representation of the geometry.
int precision
A rectangle specified with double values.
Definition: qgsrectangle.h:41
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 isEmpty() const
Returns true if the geometry is empty.
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...
virtual bool deleteVertex(QgsVertexId position)=0
Deletes a vertex within the geometry.
virtual QgsPoint * interpolatePoint(double distance) const =0
Returns an interpolated point on the curve at the specified distance.
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 QByteArray asWkb() const =0
Returns a WKB representation of the geometry.
virtual bool insertVertex(QgsVertexId position, const QgsPoint &vertex)=0
Inserts a vertex into the geometry.
const QgsCircularString * cast(const QgsAbstractGeometry *geom) const
Cast the geom to a QgsCircularString.
Enum used to indicate the direction (forward or inverse) of the transform.
virtual double vertexAngle(QgsVertexId vertex) const =0
Returns approximate angle at a vertex.
virtual bool addMValue(double mValue=0)=0
Adds a measure to the geometry, initialized to a preset value.
virtual void sumUpArea(double &sum) const =0
Sums up the area of the curve by iterating over the vertices (shoelace formula).
virtual QgsAbstractGeometry * createEmptyWithSameType() const =0
Creates a new geometry with the same class and same WKB type as the original and transfers ownership...
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.
Segmentation tolerance as maximum angle or maximum difference between approximation and circle...
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 bool equals(const QgsCurve &other) const =0
Checks whether this curve exactly equals another curve.
virtual QgsPoint endPoint() const =0
Returns the end point of the curve.
virtual double length() const
Returns the planar, 2-dimensional length of the geometry.
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.
virtual double segmentLength(QgsVertexId startVertex) const =0
Returns the length of the segment of the geometry which begins at startVertex.
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...
virtual QgsCurve * curveSubstring(double startDistance, double endDistance) const =0
Returns a new curve representing a substring of this curve.
Utility class for identifying a unique vertex within a geometry.
#define SIP_SKIP
Definition: qgis_sip.h:126
virtual double xAt(int index) const =0
Returns the x-coordinate of the specified node in the line string.
Abstract base class for curved geometry type.
Definition: qgscurve.h:35
Definition: qgis_sip.h:76
Abstract base class for all geometries.
virtual int dimension() const =0
Returns the inherent dimension of the geometry.
QgsWkbTypes::Type wkbType() const
Returns the WKB type of the geometry.
Point geometry type, with support for z-dimension and m-values.
Definition: qgspoint.h:37
Axis order for GML generation.
QVector< QgsPoint > QgsPointSequence
virtual void addToPainterPath(QPainterPath &path) const =0
Adds a curve to a painter path.
virtual void clear()=0
Clears the geometry, ie reset it to a null geometry.
virtual bool moveVertex(QgsVertexId position, const QgsPoint &newPos)=0
Moves a vertex within the geometry.
QgsCurve * clone() const override=0
Clones the geometry by performing a deep copy.
virtual void draw(QPainter &p) const =0
Draws the geometry using the specified QPainter.
#define SIP_OUT
Definition: qgis_sip.h:58
virtual bool addZValue(double zValue=0)=0
Adds a z-dimension to the geometry, initialized to a preset value.
Line string geometry type, with support for z-dimension and m-values.
Definition: qgslinestring.h:43
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 QgsRectangle calculateBoundingBox() const
Default calculator for the minimal bounding box for the geometry.
virtual double yAt(int index) const =0
Returns the y-coordinate of the specified node in the line string.
Class for doing transforms between two map coordinate systems.
#define SIP_THROW(name)
Definition: qgis_sip.h:184
Transform from source to destination CRS.
Circular string geometry type.
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...
Custom exception class for Coordinate Reference System related exceptions.
Definition: qgsexception.h:65
virtual void drawAsPolygon(QPainter &p) const =0
Draws the curve as a polygon on the specified QPainter.
virtual bool dropMValue()=0
Drops any measure values which exist in the geometry.
virtual bool fromWkt(const QString &wkt)=0
Sets the geometry from a WKT string.
virtual QgsPoint startPoint() const =0
Returns the starting point of the curve.
static Type flatType(Type type)
Returns the flat type for a WKB type.
Definition: qgswkbtypes.h:576
virtual bool hasCurvedSegments() const
Returns true if the geometry contains curved segments.
virtual void swapXy()=0
Swaps the x and y coordinates from the geometry.
virtual int numPoints() const =0
Returns the number of points in the curve.
virtual json asJsonObject(int precision=17) const
Returns a json object representation of the geometry.
double ANALYSIS_EXPORT leftOf(const QgsPoint &thepoint, const QgsPoint *p1, const QgsPoint *p2)
Returns whether &#39;thepoint&#39; is left or right of the line from &#39;p1&#39; to &#39;p2&#39;. Negativ values mean left a...
Definition: MathUtils.cpp:292
virtual bool dropZValue()=0
Drops any z-dimensions which exist in the geometry.
virtual void points(QgsPointSequence &pt) const =0
Returns a list of points within the curve.
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 QString geometryType() const =0
Returns a unique string representing the geometry type.
virtual bool fromWkb(QgsConstWkbPtr &wkb)=0
Sets the geometry from a WKB string.