Concrete representation of a circular string, that is to say a curve made of one or several arc circles. More...

#include <ogr_geometry.h>

Inheritance diagram for OGRCircularString:

Public Member Functions
	OGRCircularString ()
	Create an empty circular string.

	OGRCircularString (const OGRCircularString &other)
	Copy constructor. More...

OGRCircularString &	operator= (const OGRCircularString &other)
	Assignment operator. More...

virtual OGRErr	importFromWkb (const unsigned char *, int, OGRwkbVariant, int &nBytesConsumedOut) override
	Assign geometry from well known binary data. More...

virtual OGRErr	exportToWkb (OGRwkbByteOrder, unsigned char *, OGRwkbVariant=wkbVariantOldOgc) const override
	Convert a geometry into well known binary format. More...

OGRErr	importFromWkt (const char **) override
	deprecated

virtual OGRErr	exportToWkt (char **ppszDstText, OGRwkbVariant=wkbVariantOldOgc) const override
	Convert a geometry into well known text format. More...

virtual OGRBoolean	IsValid () const override
	Test if the geometry is valid. More...

virtual void	getEnvelope (OGREnvelope *psEnvelope) const override
	Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure. More...

virtual void	getEnvelope (OGREnvelope3D *psEnvelope) const override
	Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure. More...

virtual double	get_Length () const override
	Returns the length of the curve. More...

virtual OGRLineString *	CurveToLine (double dfMaxAngleStepSizeDegrees=0, const char const papszOptions=nullptr) const override
	Return a linestring from a curve geometry. More...

virtual void	Value (double, OGRPoint *) const override
	Fetch point at given distance along curve. More...

virtual double	get_Area () const override
	Get the area of the (closed) curve. More...

virtual OGRwkbGeometryType	getGeometryType () const override
	Fetch geometry type. More...

virtual const char *	getGeometryName () const override
	Fetch WKT name for geometry type. More...

virtual void	segmentize (double dfMaxLength) override
	Modify the geometry such it has no segment longer then the given distance. More...

virtual OGRBoolean	hasCurveGeometry (int bLookForNonLinear=FALSE) const override
	Returns if this geometry is or has curve geometry. More...

virtual OGRGeometry *	getLinearGeometry (double dfMaxAngleStepSizeDegrees=0, const char const papszOptions=nullptr) const override
	Return, possibly approximate, non-curve version of this geometry. More...

OGRSimpleCurve *	toUpperClass ()
	Return pointer of this in upper class.

const OGRSimpleCurve *	toUpperClass () const
	Return pointer of this in upper class.

virtual void	accept (IOGRGeometryVisitor *visitor) override
	Accept a visitor. More...

virtual void	accept (IOGRConstGeometryVisitor *visitor) const override
	Accept a visitor. More...

Public Member Functions inherited from OGRSimpleCurve
OGRSimpleCurve &	operator= (const OGRSimpleCurve &other)
	Assignment operator. More...

Iterator	begin ()
	Return begin of point iterator. More...

Iterator	end ()
	Return end of point iterator. More...

ConstIterator	begin () const
	Return begin of point iterator. More...

ConstIterator	end () const
	Return end of point iterator. More...

virtual int	WkbSize () const override
	Returns size of related binary representation. More...

virtual OGRGeometry *	clone () const override
	Make a copy of this object. More...

virtual void	empty () override
	Clear geometry information. More...

virtual OGRBoolean	IsEmpty () const override
	Returns TRUE (non-zero) if the object has no points. More...

virtual void	StartPoint (OGRPoint *) const override
	Return the curve start point. More...

virtual void	EndPoint (OGRPoint *) const override
	Return the curve end point. More...

virtual double	Project (const OGRPoint *) const
	Project point on linestring. More...

virtual OGRLineString *	getSubLine (double, double, int) const
	Get the portion of linestring. More...

virtual int	getNumPoints () const override
	Fetch vertex count. More...

void	getPoint (int, OGRPoint *) const
	Fetch a point in line string. More...

double	getX (int i) const
	Get X at vertex. More...

double	getY (int i) const
	Get Y at vertex. More...

double	getZ (int i) const
	Get Z at vertex. More...

double	getM (int i) const
	Get measure at vertex. More...

virtual OGRBoolean	Equals (const OGRGeometry *) const override
	Returns TRUE if two geometries are equivalent. More...

virtual void	setCoordinateDimension (int nDimension) override
	Set the coordinate dimension. More...

virtual void	set3D (OGRBoolean bIs3D) override
	Add or remove the Z coordinate dimension. More...

virtual void	setMeasured (OGRBoolean bIsMeasured) override
	Add or remove the M coordinate dimension. More...

void	setNumPoints (int nNewPointCount, int bZeroizeNewContent=TRUE)
	Set number of points in geometry. More...

void	setPoint (int, OGRPoint *)
	Set the location of a vertex in line string. More...

void	setPoint (int, double, double)
	Set the location of a vertex in line string. More...

void	setZ (int, double)
	Set the Z of a vertex in line string. More...

void	setM (int, double)
	Set the M of a vertex in line string. More...

void	setPoint (int, double, double, double)
	Set the location of a vertex in line string. More...

void	setPointM (int, double, double, double)
	Set the location of a vertex in line string. More...

void	setPoint (int, double, double, double, double)
	Set the location of a vertex in line string. More...

void	setPoints (int, const OGRRawPoint , const double =nullptr)
	Assign all points in a line string. More...

void	setPointsM (int, const OGRRawPoint , const double )
	Assign all points in a line string. More...

void	setPoints (int, const OGRRawPoint , const double , const double *)
	Assign all points in a line string. More...

void	setPoints (int, const double padfX, const double padfY, const double *padfZIn=nullptr)
	Assign all points in a line string. More...

void	setPointsM (int, const double padfX, const double padfY, const double *padfMIn=nullptr)
	Assign all points in a line string. More...

void	setPoints (int, const double padfX, const double padfY, const double padfZIn, const double padfMIn)
	Assign all points in a line string. More...

void	addPoint (const OGRPoint *)
	Add a point to a line string. More...

void	addPoint (double, double)
	Add a point to a line string. More...

void	addPoint (double, double, double)
	Add a point to a line string. More...

void	addPointM (double, double, double)
	Add a point to a line string. More...

void	addPoint (double, double, double, double)
	Add a point to a line string. More...

void	getPoints (OGRRawPoint , double =nullptr) const
	Returns all points of line string. More...

void	getPoints (void pabyX, int nXStride, void pabyY, int nYStride, void *pabyZ=nullptr, int nZStride=0) const
	Returns all points of line string. More...

void	getPoints (void pabyX, int nXStride, void pabyY, int nYStride, void pabyZ, int nZStride, void pabyM, int nMStride) const
	Returns all points of line string. More...

void	addSubLineString (const OGRLineString *, int nStartVertex=0, int nEndVertex=-1)
	Add a segment of another linestring to this one. More...

void	reversePoints (void)
	Reverse point order. More...

virtual OGRPointIterator *	getPointIterator () const override
	Returns a point iterator over the curve. More...

virtual OGRErr	transform (OGRCoordinateTransformation *poCT) override
	Apply arbitrary coordinate transformation to geometry. More...

virtual void	flattenTo2D () override
	Convert geometry to strictly 2D. More...

virtual void	swapXY () override
	Swap x and y coordinates. More...

Public Member Functions inherited from OGRCurve
ConstIterator	begin () const
	Return begin of a point iterator. More...

ConstIterator	end () const
	Return end of a point iterator. More...

virtual int	get_IsClosed () const
	Return TRUE if curve is closed. More...

virtual int	getDimension () const override
	Get the dimension of this object. More...

virtual OGRBoolean	IsConvex () const
	Returns if a (closed) curve forms a convex shape. More...

OGRSimpleCurve *	toSimpleCurve ()
	Down-cast to OGRSimpleCurve*. More...

const OGRSimpleCurve *	toSimpleCurve () const
	Down-cast to OGRSimpleCurve*. More...

Public Member Functions inherited from OGRGeometry
	OGRGeometry (const OGRGeometry &other)
	Copy constructor. More...

OGRGeometry &	operator= (const OGRGeometry &other)
	Assignment operator. More...

bool	operator== (const OGRGeometry &other) const
	Returns if two geometries are equal. More...

bool	operator!= (const OGRGeometry &other) const
	Returns if two geometries are different. More...

virtual int	getCoordinateDimension () const
	Get the dimension of the coordinates in this object. More...

int	CoordinateDimension () const
	Get the dimension of the coordinates in this object. More...

virtual OGRBoolean	IsSimple () const
	Test if the geometry is simple. More...

OGRBoolean	Is3D () const

OGRBoolean	IsMeasured () const

virtual OGRBoolean	IsRing () const
	Test if the geometry is a ring. More...

OGRErr	importFromWkb (const GByte *, int=-1, OGRwkbVariant=wkbVariantOldOgc)
	Assign geometry from well known binary data. More...

OGRErr	importFromWkt (char ppszInput) CPL_WARN_DEPRECATED("Use importFromWkt( const char) instead")
	Deprecated. More...

OGRwkbGeometryType	getIsoGeometryType () const
	Get the geometry type that conforms with ISO SQL/MM Part3. More...

virtual void	dumpReadable (FILE , const char =nullptr, char **papszOptions=nullptr) const
	Dump geometry in well known text format to indicated output file. More...

virtual char *	exportToGML (const char const papszOptions=nullptr) const
	Convert a geometry into GML format. More...

virtual char *	exportToKML () const
	Convert a geometry into KML format. More...

virtual char *	exportToJson () const
	Convert a geometry into GeoJSON format. More...

virtual GEOSGeom	exportToGEOS (GEOSContextHandle_t hGEOSCtxt) const CPL_WARN_UNUSED_RESULT
	Returns a GEOSGeom object corresponding to the geometry. More...

virtual OGRGeometry *	getCurveGeometry (const char const papszOptions=nullptr) const CPL_WARN_UNUSED_RESULT
	Return curve version of this geometry. More...

virtual void	closeRings ()
	Force rings to be closed. More...

virtual void	assignSpatialReference (OGRSpatialReference *poSR)
	Assign spatial reference to this object. More...

OGRSpatialReference *	getSpatialReference (void) const
	Returns spatial reference system for object. More...

OGRErr	transformTo (OGRSpatialReference *poSR)
	Transform geometry to new spatial reference system. More...

virtual OGRBoolean	Intersects (const OGRGeometry *) const
	Do these features intersect? More...

virtual OGRBoolean	Disjoint (const OGRGeometry *) const
	Test for disjointness. More...

virtual OGRBoolean	Touches (const OGRGeometry *) const
	Test for touching. More...

virtual OGRBoolean	Crosses (const OGRGeometry *) const
	Test for crossing. More...

virtual OGRBoolean	Within (const OGRGeometry *) const
	Test for containment. More...

virtual OGRBoolean	Contains (const OGRGeometry *) const
	Test for containment. More...

virtual OGRBoolean	Overlaps (const OGRGeometry *) const
	Test for overlap. More...

virtual OGRGeometry *	Boundary () const CPL_WARN_UNUSED_RESULT
	Compute boundary. More...

virtual double	Distance (const OGRGeometry *) const
	Compute distance between two geometries. More...

virtual OGRGeometry *	ConvexHull () const CPL_WARN_UNUSED_RESULT
	Compute convex hull. More...

virtual OGRGeometry *	Buffer (double dfDist, int nQuadSegs=30) const CPL_WARN_UNUSED_RESULT
	Compute buffer of geometry. More...

virtual OGRGeometry *	Intersection (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
	Compute intersection. More...

virtual OGRGeometry *	Union (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
	Compute union. More...

virtual OGRGeometry *	UnionCascaded () const CPL_WARN_UNUSED_RESULT
	Compute union using cascading. More...

virtual OGRGeometry *	Difference (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
	Compute difference. More...

virtual OGRGeometry *	SymDifference (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
	Compute symmetric difference. More...

virtual OGRErr	Centroid (OGRPoint *poPoint) const
	Compute the geometry centroid. More...

virtual OGRGeometry *	Simplify (double dTolerance) const CPL_WARN_UNUSED_RESULT
	Simplify the geometry. More...

OGRGeometry *	SimplifyPreserveTopology (double dTolerance) const CPL_WARN_UNUSED_RESULT
	Simplify the geometry while preserving topology. More...

virtual OGRGeometry *	DelaunayTriangulation (double dfTolerance, int bOnlyEdges) const CPL_WARN_UNUSED_RESULT
	Return a Delaunay triangulation of the vertices of the geometry. More...

virtual OGRGeometry *	Polygonize () const CPL_WARN_UNUSED_RESULT
	Polygonizes a set of sparse edges. More...

virtual double	Distance3D (const OGRGeometry *poOtherGeom) const
	Returns the 3D distance between two geometries. More...

OGRPoint *	toPoint ()
	Down-cast to OGRPoint*. More...

const OGRPoint *	toPoint () const
	Down-cast to OGRPoint*. More...

OGRCurve *	toCurve ()
	Down-cast to OGRCurve*. More...

const OGRCurve *	toCurve () const
	Down-cast to OGRCurve*. More...

OGRSimpleCurve *	toSimpleCurve ()
	Down-cast to OGRSimpleCurve*. More...

const OGRSimpleCurve *	toSimpleCurve () const
	Down-cast to OGRSimpleCurve*. More...

OGRLineString *	toLineString ()
	Down-cast to OGRLineString*. More...

const OGRLineString *	toLineString () const
	Down-cast to OGRLineString*. More...

OGRLinearRing *	toLinearRing ()
	Down-cast to OGRLinearRing*. More...

const OGRLinearRing *	toLinearRing () const
	Down-cast to OGRLinearRing*. More...

OGRCircularString *	toCircularString ()
	Down-cast to OGRCircularString*. More...

const OGRCircularString *	toCircularString () const
	Down-cast to OGRCircularString*. More...

OGRCompoundCurve *	toCompoundCurve ()
	Down-cast to OGRCompoundCurve*. More...

const OGRCompoundCurve *	toCompoundCurve () const
	Down-cast to OGRCompoundCurve*. More...

OGRSurface *	toSurface ()
	Down-cast to OGRSurface*. More...

const OGRSurface *	toSurface () const
	Down-cast to OGRSurface*. More...

OGRPolygon *	toPolygon ()
	Down-cast to OGRPolygon*. More...

const OGRPolygon *	toPolygon () const
	Down-cast to OGRPolygon*. More...

OGRTriangle *	toTriangle ()
	Down-cast to OGRTriangle*. More...

const OGRTriangle *	toTriangle () const
	Down-cast to OGRTriangle*. More...

OGRCurvePolygon *	toCurvePolygon ()
	Down-cast to OGRCurvePolygon*. More...

const OGRCurvePolygon *	toCurvePolygon () const
	Down-cast to OGRCurvePolygon*. More...

OGRGeometryCollection *	toGeometryCollection ()
	Down-cast to OGRGeometryCollection*. More...

const OGRGeometryCollection *	toGeometryCollection () const
	Down-cast to OGRGeometryCollection*. More...

OGRMultiPoint *	toMultiPoint ()
	Down-cast to OGRMultiPoint*. More...

const OGRMultiPoint *	toMultiPoint () const
	Down-cast to OGRMultiPoint*. More...

OGRMultiLineString *	toMultiLineString ()
	Down-cast to OGRMultiLineString*. More...

const OGRMultiLineString *	toMultiLineString () const
	Down-cast to OGRMultiLineString*. More...

OGRMultiPolygon *	toMultiPolygon ()
	Down-cast to OGRMultiPolygon*. More...

const OGRMultiPolygon *	toMultiPolygon () const
	Down-cast to OGRMultiPolygon*. More...

OGRMultiCurve *	toMultiCurve ()
	Down-cast to OGRMultiCurve*. More...

const OGRMultiCurve *	toMultiCurve () const
	Down-cast to OGRMultiCurve*. More...

OGRMultiSurface *	toMultiSurface ()
	Down-cast to OGRMultiSurface*. More...

const OGRMultiSurface *	toMultiSurface () const
	Down-cast to OGRMultiSurface*. More...

OGRPolyhedralSurface *	toPolyhedralSurface ()
	Down-cast to OGRPolyhedralSurface*. More...

const OGRPolyhedralSurface *	toPolyhedralSurface () const
	Down-cast to OGRPolyhedralSurface*. More...

OGRTriangulatedSurface *	toTriangulatedSurface ()
	Down-cast to OGRTriangulatedSurface*. More...

const OGRTriangulatedSurface *	toTriangulatedSurface () const
	Down-cast to OGRTriangulatedSurface*. More...

Additional Inherited Members
Public Types inherited from OGRSimpleCurve
typedef OGRPoint	ChildType
	Type of child elements. More...

Public Types inherited from OGRCurve
typedef OGRPoint	ChildType
	Type of child elements. More...

Static Public Member Functions inherited from OGRCurve
static OGRCompoundCurve *	CastToCompoundCurve (OGRCurve *puCurve)
	Cast to compound curve. More...

static OGRLineString *	CastToLineString (OGRCurve *poCurve)
	Cast to linestring. More...

static OGRLinearRing *	CastToLinearRing (OGRCurve *poCurve)
	Cast to linear ring. More...

Static Public Member Functions inherited from OGRGeometry
static GEOSContextHandle_t	createGEOSContext ()
	Create a new GEOS context. More...

static void	freeGEOSContext (GEOSContextHandle_t hGEOSCtxt)
	Destroy a GEOS context. More...

static OGRGeometryH	ToHandle (OGRGeometry *poGeom)
	Convert a OGRGeometry* to a OGRGeometryH. More...

static OGRGeometry *	FromHandle (OGRGeometryH hGeom)
	Convert a OGRGeometryH to a OGRGeometry*. More...

Protected Member Functions inherited from OGRSimpleCurve
virtual double	get_LinearArea () const
	Compute area of ring / closed linestring. More...

	OGRSimpleCurve ()
	Constructor.

	OGRSimpleCurve (const OGRSimpleCurve &other)
	Copy constructor. More...

Protected Member Functions inherited from OGRCurve
virtual int	ContainsPoint (const OGRPoint *p) const
	Returns if a point is contained in a (closed) curve. More...

virtual int	IntersectsPoint (const OGRPoint *p) const
	Returns if a point intersects a (closed) curve. More...

virtual double	get_AreaOfCurveSegments () const =0
	Get the area of the purely curve portions of a (closed) curve. More...

Detailed Description

Concrete representation of a circular string, that is to say a curve made of one or several arc circles.

Note: for implementation convenience, we make it inherit from OGRSimpleCurve whereas SQL/MM only makes it inherits from OGRCurve.

Compatibility: ISO SQL/MM Part 3.

Since: GDAL 2.0

Constructor & Destructor Documentation

◆ OGRCircularString()

OGRCircularString::OGRCircularString ( const OGRCircularString & other )

default

Copy constructor.

Note: before GDAL 2.1, only the default implementation of the constructor existed, which could be unsafe to use.

Since: GDAL 2.1

Member Function Documentation

◆ accept() [1/2]

virtual void OGRCircularString::accept ( IOGRGeometryVisitor * visitor )

inlineoverridevirtual

Accept a visitor.

Implements OGRGeometry.

◆ accept() [2/2]

virtual void OGRCircularString::accept ( IOGRConstGeometryVisitor * visitor ) const

inlineoverridevirtual

Accept a visitor.

Implements OGRGeometry.

◆ CurveToLine()

OGRLineString * OGRCircularString::CurveToLine	(	double	dfMaxAngleStepSizeDegrees = `0`,
		const char const	papszOptions = `nullptr`
	)		const

overridevirtual

Return a linestring from a curve geometry.

The returned geometry is a new instance whose ownership belongs to the caller.

If the dfMaxAngleStepSizeDegrees is zero, then a default value will be used. This is currently 4 degrees unless the user has overridden the value with the OGR_ARC_STEPSIZE configuration variable.

This method relates to the ISO SQL/MM Part 3 ICurve::CurveToLine() method.

This function is the same as C function OGR_G_CurveToLine().

Parameters

dfMaxAngleStepSizeDegrees	the largest step in degrees along the arc, zero to use the default setting.
papszOptions	options as a null-terminated list of strings or NULL. See OGRGeometryFactory::curveToLineString() for valid options.

Returns: a line string approximating the curve

Since: GDAL 2.0

Implements OGRCurve.

◆ exportToWkb()

OGRErr OGRCircularString::exportToWkb	(	OGRwkbByteOrder	eByteOrder,
		unsigned char *	pabyData,
		OGRwkbVariant	eWkbVariant = `wkbVariantOldOgc`
	)		const

overridevirtual

Convert a geometry into well known binary format.

This method relates to the SFCOM IWks::ExportToWKB() method.

This method is the same as the C function OGR_G_ExportToWkb() or OGR_G_ExportToIsoWkb(), depending on the value of eWkbVariant.

Parameters

eByteOrder	One of wkbXDR or wkbNDR indicating MSB or LSB byte order respectively.
pabyData	a buffer into which the binary representation is written. This buffer must be at least OGRGeometry::WkbSize() byte in size.
eWkbVariant	What standard to use when exporting geometries with three dimensions (or more). The default wkbVariantOldOgc is the historical OGR variant. wkbVariantIso is the variant defined in ISO SQL/MM and adopted by OGC for SFSQL 1.2.

Returns: Currently OGRERR_NONE is always returned.

Reimplemented from OGRSimpleCurve.

◆ exportToWkt()

OGRErr OGRCircularString::exportToWkt	(	char **	ppszDstText,
		OGRwkbVariant	eWkbVariant = `wkbVariantOldOgc`
	)		const

overridevirtual

Convert a geometry into well known text format.

This method relates to the SFCOM IWks::ExportToWKT() method.

This method is the same as the C function OGR_G_ExportToWkt().

Parameters

ppszDstText	a text buffer is allocated by the program, and assigned to the passed pointer. After use, *ppszDstText should be freed with CPLFree().
eWkbVariant	the specification that must be conformed too : wbkVariantOgc for old-style 99-402 extended dimension (Z) WKB types wbkVariantIso for SFSQL 1.2 and ISO SQL/MM Part 3

Returns: Currently OGRERR_NONE is always returned.

Reimplemented from OGRSimpleCurve.

◆ get_Area()

double OGRCircularString::get_Area ( ) const

overridevirtual

Get the area of the (closed) curve.

This method is designed to be used by OGRCurvePolygon::get_Area().

Returns: the area of the feature in square units of the spatial reference system in use.

Since: GDAL 2.0

Implements OGRCurve.

◆ get_Length()

double OGRCircularString::get_Length ( ) const

overridevirtual

Returns the length of the curve.

This method relates to the SFCOM ICurve::get_Length() method.

Returns: the length of the curve, zero if the curve hasn't been initialized.

Reimplemented from OGRSimpleCurve.

◆ getEnvelope() [1/2]

void OGRCircularString::getEnvelope ( OGREnvelope * psEnvelope ) const

overridevirtual

Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure.

This method is the same as the C function OGR_G_GetEnvelope().

Parameters

psEnvelope the structure in which to place the results.

Reimplemented from OGRSimpleCurve.

◆ getEnvelope() [2/2]

void OGRCircularString::getEnvelope ( OGREnvelope3D * psEnvelope ) const

overridevirtual

Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure.

This method is the same as the C function OGR_G_GetEnvelope3D().

Parameters

psEnvelope the structure in which to place the results.

Since: OGR 1.9.0

Reimplemented from OGRSimpleCurve.

◆ getGeometryName()

const char * OGRCircularString::getGeometryName ( ) const

overridevirtual

Fetch WKT name for geometry type.

There is no SFCOM analog to this method.

This method is the same as the C function OGR_G_GetGeometryName().

Returns: name used for this geometry type in well known text format. The returned pointer is to a static internal string and should not be modified or freed.

Implements OGRGeometry.

◆ getGeometryType()

OGRwkbGeometryType OGRCircularString::getGeometryType ( ) const

overridevirtual

Fetch geometry type.

Note that the geometry type may include the 2.5D flag. To get a 2D flattened version of the geometry type apply the wkbFlatten() macro to the return result.

This method is the same as the C function OGR_G_GetGeometryType().

Returns: the geometry type code.

Implements OGRGeometry.

◆ getLinearGeometry()

OGRGeometry * OGRCircularString::getLinearGeometry	(	double	dfMaxAngleStepSizeDegrees = `0`,
		const char const	papszOptions = `nullptr`
	)		const

overridevirtual

Return, possibly approximate, non-curve version of this geometry.

Returns a geometry that has no CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE in it, by approximating curve geometries.

The ownership of the returned geometry belongs to the caller.

The reverse method is OGRGeometry::getCurveGeometry().

This method is the same as the C function OGR_G_GetLinearGeometry().

Parameters

dfMaxAngleStepSizeDegrees	the largest step in degrees along the arc, zero to use the default setting.
papszOptions	options as a null-terminated list of strings. See OGRGeometryFactory::curveToLineString() for valid options.

Returns: a new geometry.

Since: GDAL 2.0

Reimplemented from OGRGeometry.

◆ hasCurveGeometry()

OGRBoolean OGRCircularString::hasCurveGeometry ( int bLookForNonLinear = FALSE ) const

overridevirtual

Returns if this geometry is or has curve geometry.

Returns if a geometry is, contains or may contain a CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE.

If bLookForNonLinear is set to TRUE, it will be actually looked if the geometry or its subgeometries are or contain a non-linear geometry in them. In which case, if the method returns TRUE, it means that getLinearGeometry() would return an approximate version of the geometry. Otherwise, getLinearGeometry() would do a conversion, but with just converting container type, like COMPOUNDCURVE -> LINESTRING, MULTICURVE -> MULTILINESTRING or MULTISURFACE -> MULTIPOLYGON, resulting in a "loss-less" conversion.

This method is the same as the C function OGR_G_HasCurveGeometry().

Parameters

bLookForNonLinear set it to TRUE to check if the geometry is or contains a CIRCULARSTRING.

Returns: TRUE if this geometry is or has curve geometry.

Since: GDAL 2.0

Reimplemented from OGRGeometry.

◆ importFromWkb()

OGRErr OGRCircularString::importFromWkb	(	const unsigned char *	pabyData,
		int	nSize,
		OGRwkbVariant	eWkbVariant,
		int &	nBytesConsumedOut
	)

overridevirtual

Assign geometry from well known binary data.

The object must have already been instantiated as the correct derived type of geometry object to match the binaries type. This method is used by the OGRGeometryFactory class, but not normally called by application code.

This method relates to the SFCOM IWks::ImportFromWKB() method.

This method is the same as the C function OGR_G_ImportFromWkb().

Parameters

pabyData	the binary input data.
nSize	the size of pabyData in bytes, or -1 if not known.
eWkbVariant	if wkbVariantPostGIS1, special interpretation is done for curve geometries code
nBytesConsumedOut	output parameter. Number of bytes consumed.

Returns: OGRERR_NONE if all goes well, otherwise any of OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or OGRERR_CORRUPT_DATA may be returned.

Since: GDAL 2.3

Reimplemented from OGRSimpleCurve.

◆ IsValid()

OGRBoolean OGRCircularString::IsValid ( ) const

overridevirtual

Test if the geometry is valid.

This method is the same as the C function OGR_G_IsValid().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return FALSE.

Returns: TRUE if the geometry has no points, otherwise FALSE.

Reimplemented from OGRGeometry.

◆ operator=()

OGRCircularString & OGRCircularString::operator= ( const OGRCircularString & other )

Assignment operator.

Note: before GDAL 2.1, only the default implementation of the operator existed, which could be unsafe to use.

Since: GDAL 2.1

◆ segmentize()

void OGRCircularString::segmentize ( double dfMaxLength )

overridevirtual

Modify the geometry such it has no segment longer then the given distance.

Add intermediate vertices to a geometry.

Interpolated points will have Z and M values (if needed) set to 0. Distance computation is performed in 2d only

This function is the same as the C function OGR_G_Segmentize()

Parameters

dfMaxLength the maximum distance between 2 points after segmentization

This method modifies the geometry to add intermediate vertices if necessary so that the maximum length between 2 consecutive vertices is lower than dfMaxLength.

Parameters

dfMaxLength maximum length between 2 consecutive vertices.

Reimplemented from OGRSimpleCurve.

◆ Value()

void OGRCircularString::Value	(	double	dfDistance,
		OGRPoint *	poPoint
	)		const

overridevirtual

Fetch point at given distance along curve.

This method relates to the SF COM ICurve::get_Value() method.

This function is the same as the C function OGR_G_Value().

Parameters

dfDistance	distance along the curve at which to sample position. This distance should be between zero and get_Length() for this curve.
poPoint	the point to be assigned the curve position.

Reimplemented from OGRSimpleCurve.

The documentation for this class was generated from the following files:

ogr_geometry.h
ogrcircularstring.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ OGRCircularString()

Member Function Documentation

◆ accept() [1/2]

◆ accept() [2/2]

◆ CurveToLine()

◆ exportToWkb()

◆ exportToWkt()

◆ get_Area()

◆ get_Length()

◆ getEnvelope() [1/2]

◆ getEnvelope() [2/2]

◆ getGeometryName()

◆ getGeometryType()

◆ getLinearGeometry()

◆ hasCurveGeometry()

◆ importFromWkb()

◆ IsValid()

◆ operator=()

◆ segmentize()

◆ Value()