GDAL
Public Member Functions | List of all members
OGRCircularString Class Reference

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:
OGRSimpleCurve OGRCurve OGRGeometry

Public Member Functions

 OGRCircularString ()
 Create an empty circular string.
 
 OGRCircularString (const OGRCircularString &other)
 Copy constructor. More...
 
OGRCircularStringoperator= (const OGRCircularString &other)
 Assignment operator. 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 OGRBoolean IsValid () const CPL_OVERRIDE
 Test if the geometry is valid. 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 double get_Length () const CPL_OVERRIDE
 Returns the length of the curve. More...
 
virtual OGRLineStringCurveToLine (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=NULL) const CPL_OVERRIDE
 Return a linestring from a curve geometry. More...
 
virtual void Value (double, OGRPoint *) const CPL_OVERRIDE
 Fetch point at given distance along curve. More...
 
virtual double get_Area () const CPL_OVERRIDE
 Get the area of the (closed) 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 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...
 
- Public Member Functions inherited from OGRSimpleCurve
OGRSimpleCurveoperator= (const OGRSimpleCurve &other)
 Assignment operator. More...
 
virtual int WkbSize () const CPL_OVERRIDE
 Returns size of related binary representation. More...
 
virtual OGRGeometryclone () const CPL_OVERRIDE
 Make a copy of this object. More...
 
virtual void empty () CPL_OVERRIDE
 Clear geometry information. More...
 
virtual OGRBoolean IsEmpty () const CPL_OVERRIDE
 Returns TRUE (non-zero) if the object has no points. 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 double Project (const OGRPoint *) const
 Project point on linestring. More...
 
virtual OGRLineStringgetSubLine (double, double, int) const
 Get the portion of linestring. More...
 
virtual int getNumPoints () const CPL_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 (OGRGeometry *) const CPL_OVERRIDE
 Returns TRUE if two geometries are equivalent. 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...
 
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, OGRRawPoint *, double *=NULL)
 Assign all points in a line string. More...
 
void setPointsM (int, OGRRawPoint *, double *)
 Assign all points in a line string. More...
 
void setPoints (int, OGRRawPoint *, double *, double *)
 Assign all points in a line string. More...
 
void setPoints (int, double *padfX, double *padfY, double *padfZIn=NULL)
 Assign all points in a line string. More...
 
void setPointsM (int, double *padfX, double *padfY, double *padfMIn=NULL)
 Assign all points in a line string. More...
 
void setPoints (int, double *padfX, double *padfY, double *padfZIn, 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 *=NULL) const
 Returns all points of line string. More...
 
void getPoints (void *pabyX, int nXStride, void *pabyY, int nYStride, void *pabyZ=NULL, 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 OGRPointIteratorgetPointIterator () const CPL_OVERRIDE
 Returns a point iterator over the curve. 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 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 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 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 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 ( const OGRCircularString 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

OGRLineString * OGRCircularString::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.

OGRErr OGRCircularString::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.

Reimplemented from OGRSimpleCurve.

OGRErr OGRCircularString::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.

Reimplemented from OGRSimpleCurve.

double OGRCircularString::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 OGRCircularString::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.

Reimplemented from OGRSimpleCurve.

void OGRCircularString::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.

Reimplemented from OGRSimpleCurve.

void OGRCircularString::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

Reimplemented from OGRSimpleCurve.

const char * OGRCircularString::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 OGRCircularString::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 * OGRCircularString::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.

OGRBoolean OGRCircularString::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 OGRCircularString::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.

Reimplemented from OGRSimpleCurve.

OGRErr OGRCircularString::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.

Reimplemented from OGRSimpleCurve.

OGRBoolean OGRCircularString::IsValid ( ) const
virtual

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.

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
void OGRCircularString::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 OGRSimpleCurve.

void OGRCircularString::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.

Reimplemented from OGRSimpleCurve.


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

Generated for GDAL by doxygen 1.8.8.