QGIS API Documentation 3.36.0-Maidenhead (09951dc0acf)
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Line string geometry type, with support for z-dimension and m-values. More...
#include <qgslinestring.h>
Public Member Functions | |
QgsLineString () | |
Constructor for an empty linestring geometry. | |
QgsLineString (const QgsLineSegment2D &segment) | |
Construct a linestring from a single 2d line segment. | |
QgsLineString (const QgsPoint &p1, const QgsPoint &p2) | |
Constructs a linestring with a single segment from p1 to p2. | |
QgsLineString (const QVector< double > &x, const QVector< double > &y, const QVector< double > &z=QVector< double >(), const QVector< double > &m=QVector< double >(), bool is25DType=false) | |
Construct a linestring from arrays of coordinates. | |
QgsLineString (const QVector< QgsPoint > &points) | |
Construct a linestring from a vector of points. | |
QgsLineString (const QVector< QgsPointXY > &points) | |
Construct a linestring from list of points. | |
bool | addMValue (double mValue=0) override |
Adds a measure to the geometry, initialized to a preset value. | |
void | addToPainterPath (QPainterPath &path) const override |
Adds a curve to a painter path. | |
void | addVertex (const QgsPoint &pt) |
Adds a new vertex to the end of the line string. | |
bool | addZValue (double zValue=0) override |
Adds a z-dimension to the geometry, initialized to a preset value. | |
void | append (const QgsLineString *line) |
Appends the contents of another line string to the end of this line string. | |
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. | |
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. | |
json | asJsonObject (int precision=17) const override |
Returns a json object representation of the geometry. | |
QString | asKml (int precision=17) const override |
Returns a KML representation of the geometry. | |
QPolygonF | asQPolygonF () const override |
Returns a QPolygonF representing the points. | |
QByteArray | asWkb (QgsAbstractGeometry::WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const override |
QString | asWkt (int precision=17) const override |
Returns a WKT representation of the geometry. | |
bool | boundingBoxIntersects (const QgsBox3D &box3d) const override |
Returns true if the bounding box of this geometry intersects with a box3d. | |
bool | boundingBoxIntersects (const QgsRectangle &rectangle) const override |
Returns true if the bounding box of this geometry intersects with a rectangle. | |
Q_DECL_DEPRECATED QgsBox3D | calculateBoundingBox3d () const |
Calculates the minimal 3D bounding box for the geometry. | |
QgsBox3D | calculateBoundingBox3D () const override |
Calculates the minimal 3D bounding box for the geometry. | |
QgsPoint | centroid () const override |
Returns the centroid of the geometry. | |
void | clear () override |
Clears the geometry, ie reset it to a null geometry. | |
QgsLineString * | clone () const override |
Clones the geometry by performing a deep copy. | |
void | close () |
Closes the line string by appending the first point to the end of the line, if it is not already closed. | |
double | closestSegment (const QgsPoint &pt, QgsPoint &segmentPt, QgsVertexId &vertexAfter, int *leftOf=nullptr, double epsilon=4 *std::numeric_limits< double >::epsilon()) const override |
Searches for the closest segment of the geometry to a given point. | |
QVector< QgsVertexId > | collectDuplicateNodes (double epsilon=4 *std::numeric_limits< double >::epsilon(), bool useZValues=false) const |
Returns a list of any duplicate nodes contained in the geometry, within the specified tolerance. | |
bool | convertTo (Qgis::WkbType type) override |
Converts the geometry to a specified type. | |
QgsLineString * | createEmptyWithSameType () const override |
Creates a new geometry with the same class and same WKB type as the original and transfers ownership. | |
QgsLineString * | curveSubstring (double startDistance, double endDistance) const override |
Returns a new curve representing a substring of this curve. | |
QgsLineString * | curveToLine (double tolerance=M_PI_2/90, SegmentationToleranceType toleranceType=MaximumAngle) const override |
Returns a new line string geometry corresponding to a segmentized approximation of the curve. | |
bool | deleteVertex (QgsVertexId position) override |
Deletes a vertex within the geometry. | |
int | dimension () const override |
Returns the inherent dimension of the geometry. | |
void | draw (QPainter &p) const override |
Draws the geometry using the specified QPainter. | |
void | drawAsPolygon (QPainter &p) const override |
Draws the curve as a polygon on the specified QPainter. | |
bool | dropMValue () override |
Drops any measure values which exist in the geometry. | |
bool | dropZValue () override |
Drops any z-dimensions which exist in the geometry. | |
QgsPoint | endPoint () const override |
Returns the end point of the curve. | |
bool | equals (const QgsCurve &other) const override |
Checks whether this curve exactly equals another curve. | |
void | extend (double startDistance, double endDistance) |
Extends the line geometry by extrapolating out the start or end of the line by a specified distance. | |
void | filterVertices (const std::function< bool(const QgsPoint &) > &filter) override |
Filters the vertices from the geometry in place, removing any which do not return true for the filter function check. | |
bool | fromWkb (QgsConstWkbPtr &wkb) override |
Sets the geometry from a WKB string. | |
bool | fromWkt (const QString &wkt) override |
Sets the geometry from a WKT string. | |
bool | fuzzyDistanceEqual (const QgsAbstractGeometry &other, double epsilon=1e-8) const override |
Performs fuzzy distance comparison between this geometry and other using an epsilon. | |
bool | fuzzyEqual (const QgsAbstractGeometry &other, double epsilon=1e-8) const override |
Performs fuzzy comparison between this geometry and other using an epsilon. | |
QString | geometryType () const override |
Returns a unique string representing the geometry type. | |
int | indexOf (const QgsPoint &point) const final |
Returns the index of the first vertex matching the given point, or -1 if a matching vertex is not found. | |
bool | insertVertex (QgsVertexId position, const QgsPoint &vertex) override |
Inserts a vertex into the geometry. | |
QgsPoint * | interpolatePoint (double distance) const override |
Returns an interpolated point on the curve at the specified distance. | |
bool | isClosed () const override |
Returns true if the curve is closed. | |
bool | isClosed2D () const override |
Returns true if the curve is closed. | |
bool | isEmpty () const override |
Returns true if the geometry is empty. | |
bool | isValid (QString &error, Qgis::GeometryValidityFlags flags=Qgis::GeometryValidityFlags()) const override |
Checks validity of the geometry, and returns true if the geometry is valid. | |
double | length () const override |
Returns the planar, 2-dimensional length of the geometry. | |
double | length3D () const |
Returns the length in 3D world of the line string. | |
double | mAt (int index) const override |
Returns the m value of the specified node in the line string. | |
const double * | mData () const |
Returns a const pointer to the m vertex data, or nullptr if the linestring does not have m values. | |
QgsLineString * | measuredLine (double start, double end) const |
Re-write the measure ordinate (or add one, if it isn't already there) interpolating the measure between the supplied start and end values. | |
bool | moveVertex (QgsVertexId position, const QgsPoint &newPos) override |
Moves a vertex within the geometry. | |
QVector< double > | mVector () const |
Returns the m vertex values as a vector. | |
int | nCoordinates () const override |
Returns the number of nodes contained in the geometry. | |
int | numPoints () const override |
Returns the number of points in the curve. | |
bool | pointAt (int node, QgsPoint &point, Qgis::VertexType &type) const override |
Returns the point and vertex id of a point within the curve. | |
QgsPoint | pointN (int i) const |
Returns the specified point from inside the line string. | |
void | points (QgsPointSequence &pt) const override |
Returns a list of points within the curve. | |
bool | removeDuplicateNodes (double epsilon=4 *std::numeric_limits< double >::epsilon(), bool useZValues=false) override |
Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerate geometry. | |
QgsLineString * | reversed () const override |
Returns a reversed copy of the curve, where the direction of the curve has been flipped. | |
void | scroll (int firstVertexIndex) final |
Scrolls the curve vertices so that they start with the vertex at the given index. | |
double | segmentLength (QgsVertexId startVertex) const override |
Returns the length of the segment of the geometry which begins at startVertex. | |
void | setMAt (int index, double m) |
Sets the m value of the specified node in the line string. | |
void | setPoints (const QgsPointSequence &points) |
Resets the line string to match the specified list of points. | |
void | setPoints (size_t size, const double *x, const double *y, const double *z=nullptr, const double *m=nullptr) |
Resets the line string to match the specified point data. | |
void | setXAt (int index, double x) |
Sets the x-coordinate of the specified node in the line string. | |
void | setYAt (int index, double y) |
Sets the y-coordinate of the specified node in the line string. | |
void | setZAt (int index, double z) |
Sets the z-coordinate of the specified node in the line string. | |
QgsLineString * | snappedToGrid (double hSpacing, double vSpacing, double dSpacing=0, double mSpacing=0) const override |
Makes a new geometry with all the points or vertices snapped to the closest point of the grid. | |
std::tuple< std::unique_ptr< QgsCurve >, std::unique_ptr< QgsCurve > > | splitCurveAtVertex (int index) const final |
Splits the curve at the specified vertex index, returning two curves which represent the portion of the curve up to an including the vertex at index, and the portion of the curve from the vertex at index (inclusive) to the end of the curve. | |
QgsPoint | startPoint () const override |
Returns the starting point of the curve. | |
void | sumUpArea (double &sum) const override |
Calculates the shoelace/triangle formula sum for the points in the linestring. | |
void | swapXy () override |
Swaps the x and y coordinates from the geometry. | |
QgsCompoundCurve * | toCurveType () const override |
Returns the geometry converted to the more generic curve type QgsCompoundCurve. | |
void | transform (const QgsCoordinateTransform &ct, Qgis::TransformDirection d=Qgis::TransformDirection::Forward, bool transformZ=false) override |
Transforms the geometry using a coordinate transform. | |
void | transform (const QTransform &t, double zTranslate=0.0, double zScale=1.0, double mTranslate=0.0, double mScale=1.0) override |
Transforms the x and y components of the geometry using a QTransform object t. | |
bool | transform (QgsAbstractGeometryTransformer *transformer, QgsFeedback *feedback=nullptr) override |
Transforms the vertices from the geometry in place, using the specified geometry transformer object. | |
void | transformVertices (const std::function< QgsPoint(const QgsPoint &) > &transform) override |
Transforms the vertices from the geometry in place, applying the transform function to every vertex. | |
double | vertexAngle (QgsVertexId vertex) const override |
Returns approximate angle at a vertex. | |
void | visitPointsByRegularDistance (double distance, const std::function< bool(double x, double y, double z, double m, double startSegmentX, double startSegmentY, double startSegmentZ, double startSegmentM, double endSegmentX, double endSegmentY, double endSegmentZ, double endSegmentM) > &visitPoint) const |
Visits regular points along the linestring, spaced by distance. | |
int | wkbSize (QgsAbstractGeometry::WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const override |
Returns the length of the QByteArray returned by asWkb() | |
double | xAt (int index) const override |
Returns the x-coordinate of the specified node in the line string. | |
const double * | xData () const |
Returns a const pointer to the x vertex data. | |
QVector< double > | xVector () const |
Returns the x vertex values as a vector. | |
double | yAt (int index) const override |
Returns the y-coordinate of the specified node in the line string. | |
const double * | yData () const |
Returns a const pointer to the y vertex data. | |
QVector< double > | yVector () const |
Returns the y vertex values as a vector. | |
double | zAt (int index) const override |
Returns the z-coordinate of the specified node in the line string. | |
const double * | zData () const |
Returns a const pointer to the z vertex data, or nullptr if the linestring does not have z values. | |
QVector< double > | zVector () const |
Returns the z vertex values as a vector. | |
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QgsCurve ()=default | |
Constructor for QgsCurve. | |
void | adjacentVertices (QgsVertexId vertex, QgsVertexId &previousVertex, QgsVertexId &nextVertex) const override |
Returns the vertices adjacent to a specified vertex within a geometry. | |
QPainterPath | asQPainterPath () const override |
Returns the geometry represented as a QPainterPath. | |
QgsAbstractGeometry * | boundary () const override |
Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). | |
QgsBox3D | boundingBox3D () const override |
Returns the 3D bounding box for the geometry. | |
QgsCoordinateSequence | coordinateSequence () const override |
Retrieves the sequence of geometries, rings and nodes. | |
virtual bool | isRing () const |
Returns true if the curve is a ring. | |
bool | nextVertex (QgsVertexId &id, QgsPoint &vertex) const override |
Returns next vertex id and coordinates. | |
void | normalize () final |
Reorganizes the geometry into a normalized form (or "canonical" form). | |
bool | operator!= (const QgsAbstractGeometry &other) const override |
bool | operator== (const QgsAbstractGeometry &other) const override |
Qgis::AngularDirection | orientation () const |
Returns the curve's orientation, e.g. | |
int | partCount () const override |
Returns count of parts contained in the geometry. | |
int | ringCount (int part=0) const override |
Returns the number of rings of which this geometry is built. | |
QgsCurve * | segmentize (double tolerance=M_PI_2/90, SegmentationToleranceType toleranceType=MaximumAngle) const override |
Returns a geometry without curves. | |
double | sinuosity () const |
Returns the curve sinuosity, which is the ratio of the curve length() to curve straightDistance2d(). | |
double | straightDistance2d () const |
Returns the straight distance of the curve, i.e. | |
QgsPoint | vertexAt (QgsVertexId id) const override |
Returns the point corresponding to a specified vertex id. | |
int | vertexCount (int part=0, int ring=0) const override |
Returns the number of vertices of which this geometry is built. | |
int | vertexNumberFromVertexId (QgsVertexId id) const override |
Returns the vertex number corresponding to a vertex id. | |
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QgsAbstractGeometry ()=default | |
Constructor for QgsAbstractGeometry. | |
QgsAbstractGeometry (const QgsAbstractGeometry &geom) | |
virtual | ~QgsAbstractGeometry ()=default |
virtual double | area () const |
Returns the planar, 2-dimensional area of the geometry. | |
QString | asJson (int precision=17) |
Returns a GeoJSON representation of the geometry as a QString. | |
virtual QByteArray | asWkb (WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const =0 |
Returns a WKB representation of the geometry. | |
virtual QgsRectangle | boundingBox () const |
Returns the minimal bounding box for the geometry. | |
virtual int | compareTo (const QgsAbstractGeometry *other) const |
Comparator for sorting of geometry. | |
const_part_iterator | const_parts_begin () const |
Returns STL-style iterator pointing to the const first part of the geometry. | |
const_part_iterator | const_parts_end () const |
Returns STL-style iterator pointing to the imaginary const part after the last part of the geometry. | |
virtual bool | hasCurvedSegments () const |
Returns true if the geometry contains curved segments. | |
bool | is3D () const |
Returns true if the geometry is 3D and contains a z-value. | |
bool | isMeasure () const |
Returns true if the geometry contains m values. | |
QgsAbstractGeometry & | operator= (const QgsAbstractGeometry &geom) |
QgsGeometryPartIterator | parts () |
Returns Java-style iterator for traversal of parts of the geometry. | |
QgsGeometryConstPartIterator | parts () const |
Returns Java-style iterator for traversal of parts of the geometry. | |
part_iterator | parts_begin () |
Returns STL-style iterator pointing to the first part of the geometry. | |
part_iterator | parts_end () |
Returns STL-style iterator pointing to the imaginary part after the last part of the geometry. | |
virtual double | perimeter () const |
Returns the planar, 2-dimensional perimeter of the geometry. | |
virtual const QgsAbstractGeometry * | simplifiedTypeRef () const |
Returns a reference to the simplest lossless representation of this geometry, e.g. | |
QgsVertexIterator | vertices () const |
Returns a read-only, Java-style iterator for traversal of vertices of all the geometry, including all geometry parts and rings. | |
vertex_iterator | vertices_begin () const |
Returns STL-style iterator pointing to the first vertex of the geometry. | |
vertex_iterator | vertices_end () const |
Returns STL-style iterator pointing to the imaginary vertex after the last vertex of the geometry. | |
Qgis::WkbType | wkbType () const |
Returns the WKB type of the geometry. | |
QString | wktTypeStr () const |
Returns the WKT type string of the geometry. | |
Static Public Member Functions | |
static const QgsLineString * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsLineString. | |
static QgsLineString * | fromBezierCurve (const QgsPoint &start, const QgsPoint &controlPoint1, const QgsPoint &controlPoint2, const QgsPoint &end, int segments=30) |
Returns a new linestring created by segmentizing the bezier curve between start and end, with the specified control points. | |
static QgsLineString * | fromQPolygonF (const QPolygonF &polygon) |
Returns a new linestring from a QPolygonF polygon input. | |
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static const QgsCurve * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsCurve. | |
Protected Member Functions | |
int | compareToSameClass (const QgsAbstractGeometry *other) const final |
Compares to an other geometry of the same class, and returns a integer for sorting of the two geometries. | |
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int | childCount () const override |
Returns number of child geometries (for geometries with child geometries) or child points (for geometries without child geometries - i.e. | |
QgsPoint | childPoint (int index) const override |
Returns point at index (for geometries without child geometries - i.e. | |
void | clearCache () const override |
Clears any cached parameters associated with the geometry, e.g., bounding boxes. | |
bool | snapToGridPrivate (double hSpacing, double vSpacing, double dSpacing, double mSpacing, const QVector< double > &srcX, const QVector< double > &srcY, const QVector< double > &srcZ, const QVector< double > &srcM, QVector< double > &outX, QVector< double > &outY, QVector< double > &outZ, QVector< double > &outM) const |
Helper function for QgsCurve subclasses to snap to grids. | |
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virtual QgsRectangle | calculateBoundingBox () const |
Default calculator for the minimal bounding box for the geometry. | |
virtual QgsAbstractGeometry * | childGeometry (int index) const |
Returns pointer to child geometry (for geometries with child geometries - i.e. | |
virtual bool | hasChildGeometries () const |
Returns whether the geometry has any child geometries (false for point / curve, true otherwise) | |
void | setZMTypeFromSubGeometry (const QgsAbstractGeometry *subggeom, Qgis::WkbType baseGeomType) |
Updates the geometry type based on whether sub geometries contain z or m values. | |
int | sortIndex () const |
Returns the sort index for the geometry, used in the compareTo() method to compare geometries of different types. | |
Friends | |
class | QgsPolygon |
class | QgsTriangle |
class | TestQgsGeometry |
Additional Inherited Members | |
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enum | AxisOrder { XY = 0 , YX } |
Axis order for GML generation. More... | |
enum | SegmentationToleranceType { MaximumAngle = 0 , MaximumDifference } |
Segmentation tolerance as maximum angle or maximum difference between approximation and circle. More... | |
enum | WkbFlag { FlagExportTrianglesAsPolygons = 1 << 0 , FlagExportNanAsDoubleMin = 1 << 1 } |
WKB export flags. More... | |
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QgsBox3D | mBoundingBox |
Cached bounding box. | |
bool | mHasCachedSummedUpArea = false |
double | mSummedUpArea = 0 |
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Qgis::WkbType | mWkbType = Qgis::WkbType::Unknown |
Line string geometry type, with support for z-dimension and m-values.
Definition at line 44 of file qgslinestring.h.
QgsLineString::QgsLineString | ( | ) |
Constructor for an empty linestring geometry.
Definition at line 45 of file qgslinestring.cpp.
QgsLineString::QgsLineString | ( | const QVector< QgsPoint > & | points | ) |
Construct a linestring from a vector of points.
Z and M type will be set based on the type of the first point in the vector.
Definition at line 50 of file qgslinestring.cpp.
QgsLineString::QgsLineString | ( | const QVector< QgsPointXY > & | points | ) |
Construct a linestring from list of points.
This constructor is more efficient then calling setPoints() or repeatedly calling addVertex()
Definition at line 158 of file qgslinestring.cpp.
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explicit |
Construct a linestring from a single 2d line segment.
Definition at line 170 of file qgslinestring.cpp.
QgsLineString::QgsLineString | ( | const QVector< double > & | x, |
const QVector< double > & | y, | ||
const QVector< double > & | z = QVector<double>() , |
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const QVector< double > & | m = QVector<double>() , |
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bool | is25DType = false |
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) |
Construct a linestring from arrays of coordinates.
If the z or m arrays are non-empty then the resultant linestring will have z and m types accordingly. This constructor is more efficient then calling setPoints() or repeatedly calling addVertex()
If the z vector is filled, then the geometry type will either be a LineStringZ(M) or LineString25D depending on the is25DType argument. If is25DType is true
(and the m vector is unfilled) then the created Linestring will be a LineString25D type. Otherwise, the LineString will be LineStringZ (or LineStringZM) type.
If the sizes of x and y are non-equal then the resultant linestring will be created using the minimum size of these arrays.
Definition at line 87 of file qgslinestring.cpp.
Constructs a linestring with a single segment from p1 to p2.
Definition at line 133 of file qgslinestring.cpp.
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overridevirtual |
Adds a measure to the geometry, initialized to a preset value.
mValue | initial m-value for all nodes |
true
on success Implements QgsAbstractGeometry.
Definition at line 2157 of file qgslinestring.cpp.
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overridevirtual |
Adds a curve to a painter path.
Implements QgsCurve.
Definition at line 1535 of file qgslinestring.cpp.
void QgsLineString::addVertex | ( | const QgsPoint & | pt | ) |
Adds a new vertex to the end of the line string.
pt | vertex to add |
Definition at line 1843 of file qgslinestring.cpp.
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overridevirtual |
Adds a z-dimension to the geometry, initialized to a preset value.
zValue | initial z-value for all nodes |
true
on success Implements QgsAbstractGeometry.
Definition at line 2133 of file qgslinestring.cpp.
void QgsLineString::append | ( | const QgsLineString * | line | ) |
Appends the contents of another line string to the end of this line string.
line | line to append. Ownership is not transferred. |
Definition at line 1273 of file qgslinestring.cpp.
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overridevirtual |
Returns a GML2 representation of the geometry.
doc | DOM document |
precision | number of decimal places for coordinates |
ns | XML namespace |
axisOrder | Axis order for generated GML |
Implements QgsAbstractGeometry.
Definition at line 783 of file qgslinestring.cpp.
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overridevirtual |
Returns a GML3 representation of the geometry.
doc | DOM document |
precision | number of decimal places for coordinates |
ns | XML namespace |
axisOrder | Axis order for generated GML |
Implements QgsAbstractGeometry.
Definition at line 798 of file qgslinestring.cpp.
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overridevirtual |
Returns a json object representation of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 812 of file qgslinestring.cpp.
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overridevirtual |
Returns a KML representation of the geometry.
Reimplemented from QgsCurve.
Definition at line 823 of file qgslinestring.cpp.
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overridevirtual |
Returns a QPolygonF representing the points.
Reimplemented from QgsCurve.
Definition at line 608 of file qgslinestring.cpp.
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override |
Definition at line 749 of file qgslinestring.cpp.
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overridevirtual |
Returns a WKT representation of the geometry.
precision | number of decimal places for coordinates |
Implements QgsAbstractGeometry.
Definition at line 768 of file qgslinestring.cpp.
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overridevirtual |
Returns true
if the bounding box of this geometry intersects with a box3d.
Since this test only considers the bounding box of the geometry, is is very fast to calculate and handles invalid geometries.
Reimplemented from QgsAbstractGeometry.
Definition at line 482 of file qgslinestring.cpp.
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overridevirtual |
Returns true
if the bounding box of this geometry intersects with a rectangle.
Since this test only considers the bounding box of the geometry, is is very fast to calculate and handles invalid geometries.
Reimplemented from QgsAbstractGeometry.
Definition at line 402 of file qgslinestring.cpp.
QgsBox3D QgsLineString::calculateBoundingBox3d | ( | ) | const |
Calculates the minimal 3D bounding box for the geometry.
Deprecated: use calculateBoundingBox3D instead
Definition at line 667 of file qgslinestring.cpp.
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overridevirtual |
Calculates the minimal 3D bounding box for the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 640 of file qgslinestring.cpp.
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inlinestatic |
Cast the geom to a QgsLineString.
Should be used by qgsgeometry_cast<QgsLineString *>( geometry ).
Definition at line 1070 of file qgslinestring.h.
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overridevirtual |
Returns the centroid of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 1951 of file qgslinestring.cpp.
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overridevirtual |
Clears the geometry, ie reset it to a null geometry.
Implements QgsAbstractGeometry.
Definition at line 273 of file qgslinestring.cpp.
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overridevirtual |
Clones the geometry by performing a deep copy.
Implements QgsCurve.
Definition at line 268 of file qgslinestring.cpp.
void QgsLineString::close | ( | ) |
Closes the line string by appending the first point to the end of the line, if it is not already closed.
Definition at line 2065 of file qgslinestring.cpp.
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overridevirtual |
Searches for the closest segment of the geometry to a given point.
pt | specifies the point to find closest segment to |
segmentPt | storage for the closest point within the geometry |
vertexAfter | storage for the ID of the vertex at the end of the closest segment |
leftOf | indicates whether the point lies on the left side of the geometry (-1 if point is to the left of the geometry, +1 if the point is to the right of the geometry, or 0 for cases where left/right could not be determined, e.g. point exactly on a line) false if point is to right of segment) |
epsilon | epsilon for segment snapping |
Implements QgsAbstractGeometry.
Definition at line 1863 of file qgslinestring.cpp.
QVector< QgsVertexId > QgsLineString::collectDuplicateNodes | ( | double | epsilon = 4 * std::numeric_limits<double>::epsilon() , |
bool | useZValues = false |
||
) | const |
Returns a list of any duplicate nodes contained in the geometry, within the specified tolerance.
If useZValues is true
then z values will also be considered when testing for duplicates.
Definition at line 569 of file qgslinestring.cpp.
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finalprotectedvirtual |
Compares to an other geometry of the same class, and returns a integer for sorting of the two geometries.
Implements QgsAbstractGeometry.
Definition at line 1605 of file qgslinestring.cpp.
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overridevirtual |
Converts the geometry to a specified type.
true
if conversion was successful Reimplemented from QgsAbstractGeometry.
Definition at line 2216 of file qgslinestring.cpp.
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overridevirtual |
Creates a new geometry with the same class and same WKB type as the original and transfers ownership.
To create it, the geometry is default constructed and then the WKB is changed.
Implements QgsAbstractGeometry.
Definition at line 1598 of file qgslinestring.cpp.
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overridevirtual |
Returns a new curve representing a substring of this curve.
The startDistance and endDistance arguments specify the length along the curve which the substring should start and end at. If the endDistance is greater than the total length of the curve then any "extra" length will be ignored.
If z or m values are present, the output z and m will be interpolated using the existing vertices' z or m values.
Implements QgsCurve.
Definition at line 1431 of file qgslinestring.cpp.
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overridevirtual |
Returns a new line string geometry corresponding to a segmentized approximation of the curve.
tolerance | segmentation tolerance |
toleranceType | maximum segmentation angle or maximum difference between approximation and curve |
Implements QgsCurve.
Definition at line 1031 of file qgslinestring.cpp.
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overridevirtual |
Deletes a vertex within the geometry.
position | vertex id for vertex to delete |
true
if delete was successful Implements QgsAbstractGeometry.
Definition at line 1810 of file qgslinestring.cpp.
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overridevirtual |
Returns the inherent dimension of the geometry.
For example, this is 0 for a point geometry, 1 for a linestring and 2 for a polygon.
Implements QgsAbstractGeometry.
Definition at line 1696 of file qgslinestring.cpp.
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overridevirtual |
Draws the geometry using the specified QPainter.
p | destination QPainter |
Implements QgsAbstractGeometry.
Definition at line 1530 of file qgslinestring.cpp.
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overridevirtual |
Draws the curve as a polygon on the specified QPainter.
p | destination QPainter |
Implements QgsCurve.
Definition at line 1554 of file qgslinestring.cpp.
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overridevirtual |
Drops any measure values which exist in the geometry.
true
if m-values were present and have been removed Implements QgsAbstractGeometry.
Definition at line 2199 of file qgslinestring.cpp.
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overridevirtual |
Drops any z-dimensions which exist in the geometry.
true
if Z values were present and have been removed Implements QgsAbstractGeometry.
Definition at line 2188 of file qgslinestring.cpp.
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overridevirtual |
Returns the end point of the curve.
Implements QgsCurve.
Definition at line 1016 of file qgslinestring.cpp.
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inlineoverridevirtual |
Checks whether this curve exactly equals another curve.
Implements QgsCurve.
Definition at line 426 of file qgslinestring.h.
void QgsLineString::extend | ( | double | startDistance, |
double | endDistance | ||
) |
Extends the line geometry by extrapolating out the start or end of the line by a specified distance.
Lines are extended using the bearing of the first or last segment in the line.
Definition at line 1566 of file qgslinestring.cpp.
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overridevirtual |
Filters the vertices from the geometry in place, removing any which do not return true
for the filter function check.
Has no meaning when called on a single point geometry.
Depending on the filter used, this may result in an invalid geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 2280 of file qgslinestring.cpp.
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static |
Returns a new linestring created by segmentizing the bezier curve between start and end, with the specified control points.
The segments parameter controls how many line segments will be present in the returned linestring.
Any z or m values present in the input coordinates will be interpolated along with the x and y values.
Definition at line 187 of file qgslinestring.cpp.
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static |
Returns a new linestring from a QPolygonF polygon input.
Definition at line 248 of file qgslinestring.cpp.
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overridevirtual |
Sets the geometry from a WKB string.
After successful read the wkb argument will be at the position where the reading has stopped.
Implements QgsAbstractGeometry.
Definition at line 623 of file qgslinestring.cpp.
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overridevirtual |
Sets the geometry from a WKT string.
Implements QgsAbstractGeometry.
Definition at line 715 of file qgslinestring.cpp.
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inlineoverridevirtual |
Performs fuzzy distance comparison between this geometry and other using an epsilon.
Traditionally, the comparison is done by examining the specific values (such as x and y) that define the location of vertices in the geometry. It focuses on the numerical differences or relationships between these values. On the other hand, comparing distances between points considers the actual spatial separation or length between the points, regardless of their coordinate values. This comparison involves measuring the distance between two points using formulas like the distance formula. Here, it's the "distance comparison" (fuzzyDistanceEqual).
Implements QgsAbstractGeometry.
Definition at line 397 of file qgslinestring.h.
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inlineoverridevirtual |
Performs fuzzy comparison between this geometry and other using an epsilon.
The comparison is done by examining the specific values (such as x and y) that define the location of vertices in the geometry.
Implements QgsAbstractGeometry.
Definition at line 368 of file qgslinestring.h.
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overridevirtual |
Returns a unique string representing the geometry type.
Implements QgsAbstractGeometry.
Definition at line 1691 of file qgslinestring.cpp.
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finalvirtual |
Returns the index of the first vertex matching the given point, or -1 if a matching vertex is not found.
Implements QgsCurve.
Definition at line 288 of file qgslinestring.cpp.
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overridevirtual |
Inserts a vertex into the geometry.
position | vertex id for position of inserted vertex |
vertex | vertex to insert |
true
if insert was successful Implements QgsAbstractGeometry.
Definition at line 1764 of file qgslinestring.cpp.
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overridevirtual |
Returns an interpolated point on the curve at the specified distance.
If z or m values are present, the output z and m will be interpolated using the existing vertices' z or m values.
If distance is negative, or is greater than the length of the curve, nullptr
will be returned.
Implements QgsCurve.
Definition at line 1411 of file qgslinestring.cpp.
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overridevirtual |
Returns true
if the curve is closed.
Reimplemented from QgsCurve.
Definition at line 391 of file qgslinestring.cpp.
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overridevirtual |
Returns true if the curve is closed.
Unlike isClosed. It looks only for XY coordinates.
Reimplemented from QgsCurve.
Definition at line 382 of file qgslinestring.cpp.
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overridevirtual |
Returns true
if the geometry is empty.
Reimplemented from QgsAbstractGeometry.
Definition at line 283 of file qgslinestring.cpp.
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overridevirtual |
Checks validity of the geometry, and returns true
if the geometry is valid.
error | will be set to the validity error message |
flags | indicates optional flags which control the type of validity checking performed (corresponding to Qgis::GeometryValidityFlags). |
true
if geometry is validReimplemented from QgsCurve.
Definition at line 319 of file qgslinestring.cpp.
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overridevirtual |
Returns the planar, 2-dimensional length of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 885 of file qgslinestring.cpp.
double QgsLineString::length3D | ( | ) | const |
Returns the length in 3D world of the line string.
If it is not a 3D line string, return its 2D length.
Definition at line 970 of file qgslinestring.cpp.
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inlineoverridevirtual |
Returns the m value of the specified node in the line string.
index | index of node, where the first node in the line is 0 |
nan
if index is out of bounds or the line does not have m values Implements QgsCurve.
Definition at line 679 of file qgslinestring.h.
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inline |
Returns a const pointer to the m vertex data, or nullptr
if the linestring does not have m values.
Definition at line 575 of file qgslinestring.h.
QgsLineString * QgsLineString::measuredLine | ( | double | start, |
double | end | ||
) | const |
Re-write the measure ordinate (or add one, if it isn't already there) interpolating the measure between the supplied start and end values.
Definition at line 2355 of file qgslinestring.cpp.
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overridevirtual |
Moves a vertex within the geometry.
position | vertex id for vertex to move |
newPos | new position of vertex |
true
if move was successful Implements QgsAbstractGeometry.
Definition at line 1790 of file qgslinestring.cpp.
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inline |
Returns the m vertex values as a vector.
Definition at line 618 of file qgslinestring.h.
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overridevirtual |
Returns the number of nodes contained in the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 1043 of file qgslinestring.cpp.
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overridevirtual |
Returns the number of points in the curve.
Implements QgsCurve.
Definition at line 1038 of file qgslinestring.cpp.
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overridevirtual |
Returns the point and vertex id of a point within the curve.
node | node number, where the first node is 0 |
point | will be set to point at corresponding node in the curve |
type | will be set to the vertex type of the node |
true
if node exists within the curve Implements QgsCurve.
Definition at line 1940 of file qgslinestring.cpp.
QgsPoint QgsLineString::pointN | ( | int | i | ) | const |
Returns the specified point from inside the line string.
i | index of point, starting at 0 for the first point |
Definition at line 1048 of file qgslinestring.cpp.
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overridevirtual |
Returns a list of points within the curve.
Implements QgsCurve.
Definition at line 1133 of file qgslinestring.cpp.
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overridevirtual |
Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerate geometry.
The epsilon parameter specifies the tolerance for coordinates when determining that vertices are identical.
By default, z values are not considered when detecting duplicate nodes. E.g. two nodes with the same x and y coordinate but different z values will still be considered duplicate and one will be removed. If useZValues is true
, then the z values are also tested and nodes with the same x and y but different z will be maintained.
Note that duplicate nodes are not tested between different parts of a multipart geometry. E.g. a multipoint geometry with overlapping points will not be changed by this method.
The function will return true
if nodes were removed, or false
if no duplicate nodes were found.
Implements QgsAbstractGeometry.
Definition at line 342 of file qgslinestring.cpp.
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overridevirtual |
Returns a reversed copy of the curve, where the direction of the curve has been flipped.
Implements QgsCurve.
Definition at line 1335 of file qgslinestring.cpp.
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finalvirtual |
Scrolls the curve vertices so that they start with the vertex at the given index.
Implements QgsCurve.
Definition at line 672 of file qgslinestring.cpp.
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overridevirtual |
Returns the length of the segment of the geometry which begins at startVertex.
Implements QgsAbstractGeometry.
Definition at line 2117 of file qgslinestring.cpp.
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inline |
Sets the m value of the specified node in the line string.
index | index of node, where the first node in the line is 0. Corresponding node must already exist in line string, and the line string must have m values. |
m | m value of node |
Definition at line 851 of file qgslinestring.h.
void QgsLineString::setPoints | ( | const QgsPointSequence & | points | ) |
Resets the line string to match the specified list of points.
The line string will inherit the dimensionality of the first point in the list.
points | new points for line string. If empty, line string will be cleared. |
Definition at line 1214 of file qgslinestring.cpp.
void QgsLineString::setPoints | ( | size_t | size, |
const double * | x, | ||
const double * | y, | ||
const double * | z = nullptr , |
||
const double * | m = nullptr |
||
) |
Resets the line string to match the specified point data.
The line string dimensionality will be based on whether z or m arrays are specified.
size | point count. |
x | array of x data |
y | array of y data |
z | array of z data, can be nullptr |
m | array of m data, can be nullptr |
Definition at line 1144 of file qgslinestring.cpp.
void QgsLineString::setXAt | ( | int | index, |
double | x | ||
) |
Sets the x-coordinate of the specified node in the line string.
index | index of node, where the first node in the line is 0. Corresponding node must already exist in line string. |
x | x-coordinate of node |
Definition at line 1113 of file qgslinestring.cpp.
void QgsLineString::setYAt | ( | int | index, |
double | y | ||
) |
Sets the y-coordinate of the specified node in the line string.
index | index of node, where the first node in the line is 0. Corresponding node must already exist in line string. |
y | y-coordinate of node |
Definition at line 1120 of file qgslinestring.cpp.
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inline |
Sets the z-coordinate of the specified node in the line string.
index | index of node, where the first node in the line is 0. Corresponding node must already exist in line string, and the line string must have z-dimension. |
z | z-coordinate of node |
Definition at line 807 of file qgslinestring.h.
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overridevirtual |
Makes a new geometry with all the points or vertices snapped to the closest point of the grid.
Ownership is transferred to the caller.
If the gridified geometry could not be calculated nullptr
will be returned. It may generate an invalid geometry (in some corner cases). It can also be thought as rounding the edges and it may be useful for removing errors.
Example:
In this case we use a 2D grid of 1x1 to gridify. In this case, it can be thought like rounding the x and y of all the points/vertices to full units (remove all decimals).
hSpacing | Horizontal spacing of the grid (x axis). 0 to disable. |
vSpacing | Vertical spacing of the grid (y axis). 0 to disable. |
dSpacing | Depth spacing of the grid (z axis). 0 (default) to disable. |
mSpacing | Custom dimension spacing of the grid (m axis). 0 (default) to disable. |
Implements QgsAbstractGeometry.
Definition at line 329 of file qgslinestring.cpp.
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finalvirtual |
Splits the curve at the specified vertex index, returning two curves which represent the portion of the curve up to an including the vertex at index, and the portion of the curve from the vertex at index (inclusive) to the end of the curve.
Implements QgsCurve.
Definition at line 911 of file qgslinestring.cpp.
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overridevirtual |
Returns the starting point of the curve.
Implements QgsCurve.
Definition at line 1007 of file qgslinestring.cpp.
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overridevirtual |
Calculates the shoelace/triangle formula sum for the points in the linestring.
If the linestring is closed (i.e. a polygon) then the polygon area is equal to the absolute value of the sum. Please note that the sum will be negative if the points are defined in clockwise order. Therefore, if you want to use the sum as an area (as the method name indicates) then you probably should use the absolute value, since otherwise a bug can be introduced (such as the bug fixed for github issue 49578)
Implements QgsCurve.
Definition at line 1997 of file qgslinestring.cpp.
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overridevirtual |
Swaps the x and y coordinates from the geometry.
This can be used to repair geometries which have accidentally had their latitude and longitude coordinates reversed.
Implements QgsAbstractGeometry.
Definition at line 2210 of file qgslinestring.cpp.
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overridevirtual |
Returns the geometry converted to the more generic curve type QgsCompoundCurve.
Reimplemented from QgsCurve.
Definition at line 1559 of file qgslinestring.cpp.
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overridevirtual |
Transforms the geometry using a coordinate transform.
ct | coordinate transform |
d | transformation direction |
transformZ | set to true to also transform z coordinates. This requires that the z coordinates in the geometry represent height relative to the vertical datum of the source CRS (generally ellipsoidal heights) and are expressed in its vertical units (generally meters). If false , then z coordinates will not be changed by the transform. |
Implements QgsAbstractGeometry.
Definition at line 1707 of file qgslinestring.cpp.
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overridevirtual |
Transforms the x and y components of the geometry using a QTransform object t.
Optionally, the geometry's z values can be scaled via zScale and translated via zTranslate. Similarly, m-values can be scaled via mScale and translated via mTranslate.
Implements QgsAbstractGeometry.
Definition at line 1729 of file qgslinestring.cpp.
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overridevirtual |
Transforms the vertices from the geometry in place, using the specified geometry transformer object.
Depending on the transformer used, this may result in an invalid geometry.
The optional feedback argument can be used to cancel the transformation before it completes. If this is done, the geometry will be left in a semi-transformed state.
true
if the geometry was successfully transformed.Implements QgsAbstractGeometry.
Definition at line 2236 of file qgslinestring.cpp.
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overridevirtual |
Transforms the vertices from the geometry in place, applying the transform function to every vertex.
Depending on the transform used, this may result in an invalid geometry.
Transform functions are not permitted to alter the dimensionality of vertices. If a transform which adds (or removes) z/m values is desired, first call the corresponding addZValue() or addMValue() function to change the geometry's dimensionality and then transform.
Reimplemented from QgsAbstractGeometry.
Definition at line 2326 of file qgslinestring.cpp.
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overridevirtual |
Returns approximate angle at a vertex.
This is usually the average angle between adjacent segments, and can be pictured as the orientation of a line following the curvature of the geometry at the specified vertex.
vertex | the vertex id |
Implements QgsAbstractGeometry.
Definition at line 2074 of file qgslinestring.cpp.
void QgsLineString::visitPointsByRegularDistance | ( | double | distance, |
const std::function< bool(double x, double y, double z, double m, double startSegmentX, double startSegmentY, double startSegmentZ, double startSegmentM, double endSegmentX, double endSegmentY, double endSegmentZ, double endSegmentM) > & | visitPoint | ||
) | const |
Visits regular points along the linestring, spaced by distance.
The visitPoint function should return false
to abort further traversal.
Definition at line 1351 of file qgslinestring.cpp.
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overridevirtual |
Returns the length of the QByteArray returned by asWkb()
The optional flags argument specifies flags controlling WKB export behavior
Implements QgsAbstractGeometry.
Definition at line 742 of file qgslinestring.cpp.
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overridevirtual |
Returns the x-coordinate of the specified node in the line string.
index | index of node, where the first node in the line is 0 |
Implements QgsCurve.
Definition at line 1097 of file qgslinestring.cpp.
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inline |
Returns a const pointer to the x vertex data.
Definition at line 535 of file qgslinestring.h.
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inline |
Returns the x vertex values as a vector.
Definition at line 588 of file qgslinestring.h.
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overridevirtual |
Returns the y-coordinate of the specified node in the line string.
index | index of node, where the first node in the line is 0 |
Implements QgsCurve.
Definition at line 1105 of file qgslinestring.cpp.
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inline |
Returns a const pointer to the y vertex data.
Definition at line 546 of file qgslinestring.h.
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inline |
Returns the y vertex values as a vector.
Definition at line 598 of file qgslinestring.h.
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inlineoverridevirtual |
Returns the z-coordinate of the specified node in the line string.
index | index of node, where the first node in the line is 0 |
nan
if index is out of bounds or the line does not have a z dimension Implements QgsCurve.
Definition at line 633 of file qgslinestring.h.
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inline |
Returns a const pointer to the z vertex data, or nullptr
if the linestring does not have z values.
Definition at line 559 of file qgslinestring.h.
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inline |
Returns the z vertex values as a vector.
Definition at line 608 of file qgslinestring.h.
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friend |
Definition at line 1222 of file qgslinestring.h.
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friend |
Definition at line 1223 of file qgslinestring.h.
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friend |
Definition at line 1224 of file qgslinestring.h.