GDAL
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OGRCompoundCurve Class Reference

Utility class to store a collection of curves. More...

#include <ogr_geometry.h>

Inheritance diagram for OGRCompoundCurve:
OGRCurve OGRGeometry

Public Member Functions

 OGRCompoundCurve ()
 Create an empty compound curve.
 
 OGRCompoundCurve (const OGRCompoundCurve &other)
 Copy constructor. More...
 
OGRCompoundCurveoperator= (const OGRCompoundCurve &other)
 Assignment operator. More...
 
virtual int WkbSize () const CPL_OVERRIDE
 Returns size of related binary representation. More...
 
virtual OGRErr importFromWkb (unsigned char *, int=-1, OGRwkbVariant=wkbVariantOldOgc) CPL_OVERRIDE
 Assign geometry from well known binary data. More...
 
virtual OGRErr exportToWkb (OGRwkbByteOrder, unsigned char *, OGRwkbVariant=wkbVariantOldOgc) const CPL_OVERRIDE
 Convert a geometry into well known binary format. More...
 
virtual OGRErr importFromWkt (char **) CPL_OVERRIDE
 Assign geometry from well known text data. More...
 
virtual OGRErr exportToWkt (char **ppszDstText, OGRwkbVariant=wkbVariantOldOgc) const CPL_OVERRIDE
 Convert a geometry into well known text format. More...
 
virtual OGRGeometryclone () const CPL_OVERRIDE
 Make a copy of this object. More...
 
virtual void empty () CPL_OVERRIDE
 Clear geometry information. More...
 
virtual void getEnvelope (OGREnvelope *psEnvelope) const CPL_OVERRIDE
 Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure. More...
 
virtual void getEnvelope (OGREnvelope3D *psEnvelope) const CPL_OVERRIDE
 Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure. More...
 
virtual OGRBoolean IsEmpty () const CPL_OVERRIDE
 Returns TRUE (non-zero) if the object has no points. More...
 
virtual double get_Length () const CPL_OVERRIDE
 Returns the length of the curve. More...
 
virtual void StartPoint (OGRPoint *) const CPL_OVERRIDE
 Return the curve start point. More...
 
virtual void EndPoint (OGRPoint *) const CPL_OVERRIDE
 Return the curve end point. More...
 
virtual void Value (double, OGRPoint *) const CPL_OVERRIDE
 Fetch point at given distance along curve. More...
 
virtual OGRLineStringCurveToLine (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=NULL) const CPL_OVERRIDE
 Return a linestring from a curve geometry. More...
 
virtual int getNumPoints () const CPL_OVERRIDE
 Return the number of points of a curve geometry. More...
 
virtual double get_AreaOfCurveSegments () const CPL_OVERRIDE
 Return area of curve segments. More...
 
virtual double get_Area () const CPL_OVERRIDE
 Get the area of the (closed) curve. More...
 
virtual OGRBoolean Equals (OGRGeometry *) const CPL_OVERRIDE
 Returns TRUE if two geometries are equivalent. More...
 
int getNumCurves () const
 Return the number of curves. More...
 
OGRCurvegetCurve (int)
 Fetch reference to indicated internal ring. More...
 
const OGRCurvegetCurve (int) const
 Fetch reference to indicated internal ring. More...
 
virtual void setCoordinateDimension (int nDimension) CPL_OVERRIDE
 Set the coordinate dimension. More...
 
virtual void set3D (OGRBoolean bIs3D) CPL_OVERRIDE
 Add or remove the Z coordinate dimension. More...
 
virtual void setMeasured (OGRBoolean bIsMeasured) CPL_OVERRIDE
 Add or remove the M coordinate dimension. More...
 
OGRErr addCurve (OGRCurve *, double dfToleranceEps=1e-14)
 Add a curve to the container. More...
 
OGRErr addCurveDirectly (OGRCurve *, double dfToleranceEps=1e-14)
 Add a curve directly to the container. More...
 
OGRCurvestealCurve (int)
 "Steal" reference to curve. More...
 
virtual OGRPointIteratorgetPointIterator () const CPL_OVERRIDE
 Returns a point iterator over the curve. More...
 
virtual OGRwkbGeometryType getGeometryType () const CPL_OVERRIDE
 Fetch geometry type. More...
 
virtual const char * getGeometryName () const CPL_OVERRIDE
 Fetch WKT name for geometry type. More...
 
virtual OGRErr transform (OGRCoordinateTransformation *poCT) CPL_OVERRIDE
 Apply arbitrary coordinate transformation to geometry. More...
 
virtual void flattenTo2D () CPL_OVERRIDE
 Convert geometry to strictly 2D. More...
 
virtual void segmentize (double dfMaxLength) CPL_OVERRIDE
 Modify the geometry such it has no segment longer then the given distance. More...
 
virtual OGRBoolean hasCurveGeometry (int bLookForNonLinear=FALSE) const CPL_OVERRIDE
 Returns if this geometry is or has curve geometry. More...
 
virtual OGRGeometrygetLinearGeometry (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=NULL) const CPL_OVERRIDE
 Return, possibly approximate, non-curve version of this geometry. More...
 
virtual void swapXY () CPL_OVERRIDE
 Swap x and y coordinates. More...
 
- Public Member Functions inherited from OGRCurve
virtual int get_IsClosed () const
 Return TRUE if curve is closed. More...
 
virtual int getDimension () const CPL_OVERRIDE
 Get the dimension of this object. More...
 
virtual OGRBoolean IsConvex () const
 Returns if a (closed) curve forms a convex shape. More...
 
- Public Member Functions inherited from OGRGeometry
 OGRGeometry (const OGRGeometry &other)
 Copy constructor. More...
 
OGRGeometryoperator= (const OGRGeometry &other)
 Assignment operator. 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 IsValid () const
 Test if the geometry is valid. 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...
 
OGRwkbGeometryType getIsoGeometryType () const
 Get the geometry type that conforms with ISO SQL/MM Part3. More...
 
virtual void dumpReadable (FILE *, const char *=NULL, char **papszOptions=NULL) const
 Dump geometry in well known text format to indicated output file. More...
 
virtual char * exportToGML (const char *const *papszOptions=NULL) 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 OGRGeometrygetCurveGeometry (const char *const *papszOptions=NULL) const CPL_WARN_UNUSED_RESULT
 Return curve version of this geometry. More...
 
virtual void closeRings ()
 Force rings to be closed. More...
 
void assignSpatialReference (OGRSpatialReference *poSR)
 Assign spatial reference to this object. More...
 
OGRSpatialReferencegetSpatialReference (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 OGRGeometryBoundary () const CPL_WARN_UNUSED_RESULT
 Compute boundary. More...
 
virtual double Distance (const OGRGeometry *) const
 Compute distance between two geometries. More...
 
virtual OGRGeometryConvexHull () const CPL_WARN_UNUSED_RESULT
 Compute convex hull. More...
 
virtual OGRGeometryBuffer (double dfDist, int nQuadSegs=30) const CPL_WARN_UNUSED_RESULT
 Compute buffer of geometry. More...
 
virtual OGRGeometryIntersection (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
 Compute intersection. More...
 
virtual OGRGeometryUnion (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
 Compute union. More...
 
virtual OGRGeometryUnionCascaded () const CPL_WARN_UNUSED_RESULT
 Compute union using cascading. More...
 
virtual OGRGeometryDifference (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
 Compute difference. More...
 
virtual OGRGeometrySymDifference (const OGRGeometry *) const CPL_WARN_UNUSED_RESULT
 Compute symmetric difference. More...
 
virtual OGRErr Centroid (OGRPoint *poPoint) const
 Compute the geometry centroid. More...
 
virtual OGRGeometrySimplify (double dTolerance) const CPL_WARN_UNUSED_RESULT
 Simplify the geometry. More...
 
OGRGeometrySimplifyPreserveTopology (double dTolerance) const CPL_WARN_UNUSED_RESULT
 Simplify the geometry while preserving topology. More...
 
virtual OGRGeometryDelaunayTriangulation (double dfTolerance, int bOnlyEdges) const CPL_WARN_UNUSED_RESULT
 Return a Delaunay triangulation of the vertices of the geometry. More...
 
virtual OGRGeometryPolygonize () 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...
 

Additional Inherited Members

- Static Public Member Functions inherited from OGRCurve
static OGRCompoundCurveCastToCompoundCurve (OGRCurve *puCurve)
 Cast to compound curve. More...
 
static OGRLineStringCastToLineString (OGRCurve *poCurve)
 Cast to linestring. More...
 
static OGRLinearRingCastToLinearRing (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...
 
- Protected Member Functions inherited from OGRCurve
virtual int ContainsPoint (const OGRPoint *p) const
 Returns if a point is contained in a (closed) curve. More...
 

Detailed Description

Utility class to store a collection of curves.

Used as a member of OGRCompoundCurve and OGRCurvePolygon.

This class is only exported because of linking issues. It should never be directly used.

Since
GDAL 2.0 Concrete representation of a compound curve, made of curves: OGRLineString and OGRCircularString. Each curve is connected by its first point to the last point of the previous curve.

Compatibility: ISO SQL/MM Part 3.

Since
GDAL 2.0

Constructor & Destructor Documentation

OGRCompoundCurve::OGRCompoundCurve ( const OGRCompoundCurve other)

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

OGRErr OGRCompoundCurve::addCurve ( OGRCurve poCurve,
double  dfToleranceEps = 1e-14 
)

Add a curve to the container.

The passed geometry is cloned to make an internal copy.

There is no ISO SQL/MM analog to this method.

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

Parameters
poCurvegeometry to add to the container.
dfToleranceEpstolerance when checking that the first point of a segment matches then end point of the previous one. Default value: 1e-14.
Returns
OGRERR_NONE if successful, or OGRERR_FAILURE in case of error (for example if curves are not contiguous)
OGRErr OGRCompoundCurve::addCurveDirectly ( OGRCurve poCurve,
double  dfToleranceEps = 1e-14 
)

Add a curve directly to the container.

Ownership of the passed geometry is taken by the container rather than cloning as addCurve() does.

There is no ISO SQL/MM analog to this method.

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

Parameters
poCurvegeometry to add to the container.
dfToleranceEpstolerance when checking that the first point of a segment matches then end point of the previous one. Default value: 1e-14.
Returns
OGRERR_NONE if successful, or OGRERR_FAILURE in case of error (for example if curves are not contiguous)
OGRGeometry * OGRCompoundCurve::clone ( ) const
virtual

Make a copy of this object.

This method relates to the SFCOM IGeometry::clone() method.

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

Returns
a new object instance with the same geometry, and spatial reference system as the original.

Implements OGRGeometry.

OGRLineString * OGRCompoundCurve::CurveToLine ( double  dfMaxAngleStepSizeDegrees = 0,
const char *const *  papszOptions = NULL 
) const
virtual

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
dfMaxAngleStepSizeDegreesthe largest step in degrees along the arc, zero to use the default setting.
papszOptionsoptions 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.

void OGRCompoundCurve::empty ( )
virtual

Clear geometry information.

This restores the geometry to it's initial state after construction, and before assignment of actual geometry.

This method relates to the SFCOM IGeometry::Empty() method.

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

Implements OGRGeometry.

void OGRCompoundCurve::EndPoint ( OGRPoint poPoint) const
virtual

Return the curve end point.

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

Parameters
poPointthe point to be assigned the end location.

Implements OGRCurve.

OGRBoolean OGRCompoundCurve::Equals ( OGRGeometry poOtherGeom) const
virtual

Returns TRUE if two geometries are equivalent.

This operation implements the SQL/MM ST_OrderingEquals() operation.

The comparison is done in a structural way, that is to say that the geometry types must be identical, as well as the number and ordering of sub-geometries and vertices. Or equivalently, two geometries are considered equal by this method if their WKT/WKB representation is equal. Note: this must be distinguished for equality in a spatial way (which is the purpose of the ST_Equals() operation).

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

Returns
TRUE if equivalent or FALSE otherwise.

Implements OGRGeometry.

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

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
eByteOrderOne of wkbXDR or wkbNDR indicating MSB or LSB byte order respectively.
pabyDataa buffer into which the binary representation is written. This buffer must be at least OGRGeometry::WkbSize() byte in size.
eWkbVariantWhat 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.

Implements OGRGeometry.

OGRErr OGRCompoundCurve::exportToWkt ( char **  ppszDstText,
OGRwkbVariant  eWkbVariant = wkbVariantOldOgc 
) const
virtual

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
ppszDstTexta text buffer is allocated by the program, and assigned to the passed pointer. After use, *ppszDstText should be freed with CPLFree().
eWkbVariantthe 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.

Implements OGRGeometry.

void OGRCompoundCurve::flattenTo2D ( )
virtual

Convert geometry to strictly 2D.

In a sense this converts all Z coordinates to 0.0.

This method is the same as the C function OGR_G_FlattenTo2D().

Implements OGRGeometry.

double OGRCompoundCurve::get_Area ( ) const
virtual

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.

double OGRCompoundCurve::get_AreaOfCurveSegments ( ) const
virtual

Return area of curve segments.

Returns
area.

Implements OGRCurve.

double OGRCompoundCurve::get_Length ( ) const
virtual

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.

Implements OGRCurve.

OGRCurve * OGRCompoundCurve::getCurve ( int  iRing)

Fetch reference to indicated internal ring.

Note that the returned curve pointer is to an internal data object of the OGRCompoundCurve. It should not be modified or deleted by the application, and the pointer is only valid till the polygon is next modified. Use the OGRGeometry::clone() method to make a separate copy within the application.

Relates to the ISO SQL/MM ST_CurveN() function.

Parameters
iRingcurve index from 0 to getNumCurves() - 1.
Returns
pointer to curve. May be NULL.
const OGRCurve * OGRCompoundCurve::getCurve ( int  iCurve) const

Fetch reference to indicated internal ring.

Note that the returned curve pointer is to an internal data object of the OGRCompoundCurve. It should not be modified or deleted by the application, and the pointer is only valid till the polygon is next modified. Use the OGRGeometry::clone() method to make a separate copy within the application.

Relates to the ISO SQL/MM ST_CurveN() function.

Parameters
iCurvecurve index from 0 to getNumCurves() - 1.
Returns
pointer to curve. May be NULL.
void OGRCompoundCurve::getEnvelope ( OGREnvelope *  psEnvelope) const
virtual

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
psEnvelopethe structure in which to place the results.

Implements OGRGeometry.

void OGRCompoundCurve::getEnvelope ( OGREnvelope3D *  psEnvelope) const
virtual

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
psEnvelopethe structure in which to place the results.
Since
OGR 1.9.0

Implements OGRGeometry.

const char * OGRCompoundCurve::getGeometryName ( ) const
virtual

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.

OGRwkbGeometryType OGRCompoundCurve::getGeometryType ( ) const
virtual

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.

OGRGeometry * OGRCompoundCurve::getLinearGeometry ( double  dfMaxAngleStepSizeDegrees = 0,
const char *const *  papszOptions = NULL 
) const
virtual

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
dfMaxAngleStepSizeDegreesthe largest step in degrees along the arc, zero to use the default setting.
papszOptionsoptions as a null-terminated list of strings. See OGRGeometryFactory::curveToLineString() for valid options.
Returns
a new geometry.
Since
GDAL 2.0

Reimplemented from OGRGeometry.

int OGRCompoundCurve::getNumCurves ( ) const

Return the number of curves.

Note that the number of curves making this compound curve.

Relates to the ISO SQL/MM ST_NumCurves() function.

Returns
number of curves.
int OGRCompoundCurve::getNumPoints ( ) const
virtual

Return the number of points of a curve geometry.

This method, as a method of OGRCurve, does not relate to a standard. For circular strings or linestrings, it returns the number of points, conforming to SF COM NumPoints(). For compound curves, it returns the sum of the number of points of each of its components (non including intermediate starting/ending points of the different parts).

Returns
the number of points of the curve.
Since
GDAL 2.0

Implements OGRCurve.

OGRPointIterator * OGRCompoundCurve::getPointIterator ( ) const
virtual

Returns a point iterator over the curve.

The curve must not be modified while an iterator exists on it.

The iterator must be destroyed with OGRPointIterator::destroy().

Returns
a point iterator over the curve.
Since
GDAL 2.0

Implements OGRCurve.

OGRBoolean OGRCompoundCurve::hasCurveGeometry ( int  bLookForNonLinear = FALSE) const
virtual

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
bLookForNonLinearset 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.

OGRErr OGRCompoundCurve::importFromWkb ( unsigned char *  pabyData,
int  nSize = -1,
OGRwkbVariant  eWkbVariant = wkbVariantOldOgc 
)
virtual

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
pabyDatathe binary input data.
nSizethe size of pabyData in bytes, or zero if not known.
eWkbVariantif wkbVariantPostGIS1, special interpretation is done for curve geometries code
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.

Implements OGRGeometry.

OGRErr OGRCompoundCurve::importFromWkt ( char **  ppszInput)
virtual

Assign geometry from well known text data.

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

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

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

Parameters
ppszInputpointer to a pointer to the source text. The pointer is updated to pointer after the consumed text.
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.

Implements OGRGeometry.

OGRBoolean OGRCompoundCurve::IsEmpty ( ) const
virtual

Returns TRUE (non-zero) if the object has no points.

Normally this returns FALSE except between when an object is instantiated and points have been assigned.

This method relates to the SFCOM IGeometry::IsEmpty() method.

Returns
TRUE if object is empty, otherwise FALSE.

Implements OGRGeometry.

OGRCompoundCurve & OGRCompoundCurve::operator= ( const OGRCompoundCurve 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
void OGRCompoundCurve::segmentize ( double  dfMaxLength)
virtual

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
dfMaxLengththe 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
dfMaxLengthmaximum length between 2 consecutive vertices.

Reimplemented from OGRGeometry.

void OGRCompoundCurve::set3D ( OGRBoolean  bIs3D)
virtual

Add or remove the Z coordinate dimension.

This method adds or removes the explicit Z coordinate dimension. Removing the Z coordinate dimension of a geometry will remove any existing Z values. Adding the Z dimension to a geometry collection, a compound curve, a polygon, etc. will affect the children geometries.

Parameters
bIs3DShould the geometry have a Z dimension, either TRUE or FALSE.
Since
GDAL 2.1

Reimplemented from OGRGeometry.

void OGRCompoundCurve::setCoordinateDimension ( int  nNewDimension)
virtual

Set the coordinate dimension.

This method sets the explicit coordinate dimension. Setting the coordinate dimension of a geometry to 2 should zero out any existing Z values. Setting the dimension of a geometry collection, a compound curve, a polygon, etc. will affect the children geometries. This will also remove the M dimension if present before this call.

Deprecated:
use set3D() or setMeasured().
Parameters
nNewDimensionNew coordinate dimension value, either 2 or 3.

Reimplemented from OGRGeometry.

void OGRCompoundCurve::setMeasured ( OGRBoolean  bIsMeasured)
virtual

Add or remove the M coordinate dimension.

This method adds or removes the explicit M coordinate dimension. Removing the M coordinate dimension of a geometry will remove any existing M values. Adding the M dimension to a geometry collection, a compound curve, a polygon, etc. will affect the children geometries.

Parameters
bIsMeasuredShould the geometry have a M dimension, either TRUE or FALSE.
Since
GDAL 2.1

Reimplemented from OGRGeometry.

void OGRCompoundCurve::StartPoint ( OGRPoint poPoint) const
virtual

Return the curve start point.

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

Parameters
poPointthe point to be assigned the start location.

Implements OGRCurve.

OGRCurve * OGRCompoundCurve::stealCurve ( int  iCurve)

"Steal" reference to curve.

Parameters
iCurvecurve index from 0 to getNumCurves() - 1.
Returns
pointer to curve. May be NULL.
void OGRCompoundCurve::swapXY ( )
virtual

Swap x and y coordinates.

Since
OGR 1.8.0

Reimplemented from OGRGeometry.

OGRErr OGRCompoundCurve::transform ( OGRCoordinateTransformation poCT)
virtual

Apply arbitrary coordinate transformation to geometry.

This method will transform the coordinates of a geometry from their current spatial reference system to a new target spatial reference system. Normally this means reprojecting the vectors, but it could include datum shifts, and changes of units.

Note that this method does not require that the geometry already have a spatial reference system. It will be assumed that they can be treated as having the source spatial reference system of the OGRCoordinateTransformation object, and the actual SRS of the geometry will be ignored. On successful completion the output OGRSpatialReference of the OGRCoordinateTransformation will be assigned to the geometry.

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

Parameters
poCTthe transformation to apply.
Returns
OGRERR_NONE on success or an error code.

Implements OGRGeometry.

void OGRCompoundCurve::Value ( double  dfDistance,
OGRPoint poPoint 
) const
virtual

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

Implements OGRCurve.

int OGRCompoundCurve::WkbSize ( ) const
virtual

Returns size of related binary representation.

This method returns the exact number of bytes required to hold the well known binary representation of this geometry object. Its computation may be slightly expensive for complex geometries.

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

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

Returns
size of binary representation in bytes.

Implements OGRGeometry.


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

Generated for GDAL by doxygen 1.8.8.