Public Member Functions

OGRPoint Class Reference

#include <ogr_geometry.h>

Inheritance diagram for OGRPoint:
OGRGeometry

List of all members.

Public Member Functions

 OGRPoint ()
 Create a (0,0) point.
virtual int WkbSize () const
 Returns size of related binary representation.
virtual OGRErr importFromWkb (unsigned char *, int=-1)
 Assign geometry from well known binary data.
virtual OGRErr exportToWkb (OGRwkbByteOrder, unsigned char *, OGRwkbVariant=wkbVariantOgc) const
 Convert a geometry into well known binary format.
virtual OGRErr importFromWkt (char **)
 Assign geometry from well known text data.
virtual OGRErr exportToWkt (char **ppszDstText) const
 Convert a geometry into well known text format.
virtual int getDimension () const
 Get the dimension of this object.
virtual OGRGeometryclone () const
 Make a copy of this object.
virtual void empty ()
 Clear geometry information. This restores the geometry to it's initial state after construction, and before assignment of actual geometry.
virtual void getEnvelope (OGREnvelope *psEnvelope) const
 Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure.
virtual void getEnvelope (OGREnvelope3D *psEnvelope) const
 Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure.
virtual OGRBoolean IsEmpty () const
 Returns TRUE (non-zero) if the object has no points.
double getX () const
 Fetch X coordinate.
double getY () const
 Fetch Y coordinate.
double getZ () const
 Fetch Z coordinate.
virtual void setCoordinateDimension (int nDimension)
 Set the coordinate dimension.
void setX (double xIn)
 Assign point X coordinate.
void setY (double yIn)
 Assign point Y coordinate.
void setZ (double zIn)
 Assign point Z coordinate. Calling this method will force the geometry coordinate dimension to 3D (wkbPoint|wkbZ).
virtual OGRBoolean Equals (OGRGeometry *) const
 Returns TRUE if two geometries are equivalent.
virtual const char * getGeometryName () const
 Fetch WKT name for geometry type.
virtual OGRwkbGeometryType getGeometryType () const
 Fetch geometry type.
virtual OGRErr transform (OGRCoordinateTransformation *poCT)
 Apply arbitrary coordinate transformation to geometry.
virtual void flattenTo2D ()
 Convert geometry to strictly 2D. In a sense this converts all Z coordinates to 0.0.
virtual void swapXY ()
 Swap x and y coordinates.

Detailed Description

Point class.

Implements SFCOM IPoint methods.


Member Function Documentation

OGRGeometry * OGRPoint::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.

References OGRGeometry::assignSpatialReference(), OGRGeometry::getSpatialReference(), OGRPoint(), and setCoordinateDimension().

void OGRPoint::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.

Referenced by OGRGeometry::Centroid(), importFromWkt(), OGRPoint(), and OGRPolygon::PointOnSurface().

OGRBoolean OGRPoint::Equals ( OGRGeometry poOtherGeom  )  const [virtual]

Returns TRUE if two geometries are equivalent.

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

Returns:
TRUE if equivalent or FALSE otherwise.

Implements OGRGeometry.

References getGeometryType(), OGRGeometry::getGeometryType(), getX(), getY(), getZ(), OGRGeometry::IsEmpty(), and IsEmpty().

Referenced by OGRGeometryFactory::forceToLineString().

OGRErr OGRPoint::exportToWkb ( OGRwkbByteOrder  eByteOrder,
unsigned char *  pabyData,
OGRwkbVariant  eWkbVariant = wkbVariantOgc 
) 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().

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 wkbVariantOgc 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.

References getGeometryType(), IsEmpty(), and wkbVariantIso.

OGRErr OGRPoint::exportToWkt ( char **  ppszDstText  )  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:
ppszDstText a text buffer is allocated by the program, and assigned to the passed pointer. After use, *ppszDstText should be freed with OGRFree().
Returns:
Currently OGRERR_NONE is always returned.

Implements OGRGeometry.

References IsEmpty().

void OGRPoint::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.

int OGRPoint::getDimension (  )  const [virtual]

Get the dimension of this object.

This method corresponds to the SFCOM IGeometry::GetDimension() method. It indicates the dimension of the object, but does not indicate the dimension of the underlying space (as indicated by OGRGeometry::getCoordinateDimension()).

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

Returns:
0 for points, 1 for lines and 2 for surfaces.

Implements OGRGeometry.

void OGRPoint::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:
psEnvelope the structure in which to place the results.

Implements OGRGeometry.

References getX(), and getY().

void OGRPoint::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:
psEnvelope the structure in which to place the results.
Since:
OGR 1.9.0

Implements OGRGeometry.

References getX(), getY(), and getZ().

const char * OGRPoint::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 OGRPoint::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.

Referenced by Equals(), exportToWkb(), and OGR_G_Centroid().

double OGRPoint::getX (  )  const [inline]

Fetch X coordinate.

Relates to the SFCOM IPoint::get_X() method.

Returns:
the X coordinate of this point.

Referenced by OGRLineString::addPoint(), OGRGeometry::Centroid(), Equals(), OGRMultiPoint::exportToWkt(), OGRCurve::get_IsClosed(), getEnvelope(), OGRGeometryFactory::organizePolygons(), OGRPolygon::PointOnSurface(), and OGRLineString::setPoint().

double OGRPoint::getY (  )  const [inline]

Fetch Y coordinate.

Relates to the SFCOM IPoint::get_Y() method.

Returns:
the Y coordinate of this point.

Referenced by OGRLineString::addPoint(), OGRGeometry::Centroid(), Equals(), OGRMultiPoint::exportToWkt(), OGRCurve::get_IsClosed(), getEnvelope(), OGRGeometryFactory::organizePolygons(), OGRPolygon::PointOnSurface(), and OGRLineString::setPoint().

double OGRPoint::getZ (  )  const [inline]

Fetch Z coordinate.

Relates to the SFCOM IPoint::get_Z() method.

Returns:
the Z coordinate of this point, or zero if it is a 2D point.

Referenced by OGRLineString::addPoint(), Equals(), OGRMultiPoint::exportToWkt(), getEnvelope(), and OGRLineString::setPoint().

OGRErr OGRPoint::importFromWkb ( unsigned char *  pabyData,
int  nSize = -1 
) [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:
pabyData the binary input data.
nSize the size of pabyData in bytes, or zero if not known.
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.

References wkbPoint.

OGRErr OGRPoint::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:
ppszInput pointer 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.

References empty().

OGRBoolean OGRPoint::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.

Referenced by OGRGeometry::Centroid(), Equals(), exportToWkb(), exportToWkt(), OGRMultiPoint::exportToWkt(), and OGRPolygon::PointOnSurface().

void OGRPoint::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 will not necessarily affect the children geometries.

Parameters:
nNewDimension New coordinate dimension value, either 2 or 3.

Reimplemented from OGRGeometry.

Referenced by clone().

void OGRPoint::setX ( double  xIn  )  [inline]

Assign point X coordinate.

There is no corresponding SFCOM method.

Referenced by OGRGeometry::Centroid(), OGRLineString::getPoint(), OGRGeometryFactory::organizePolygons(), OGRPolygon::PointOnSurface(), and OGRLineString::Value().

void OGRPoint::setY ( double  yIn  )  [inline]

Assign point Y coordinate.

There is no corresponding SFCOM method.

Referenced by OGRGeometry::Centroid(), OGRLineString::getPoint(), OGRGeometryFactory::organizePolygons(), OGRPolygon::PointOnSurface(), and OGRLineString::Value().

void OGRPoint::setZ ( double  zIn  )  [inline]

Assign point Z coordinate. Calling this method will force the geometry coordinate dimension to 3D (wkbPoint|wkbZ).

There is no corresponding SFCOM method.

Referenced by OGRLineString::getPoint(), and OGRLineString::Value().

void OGRPoint::swapXY (  )  [virtual]

Swap x and y coordinates.

Since:
OGR 1.8.0

Reimplemented from OGRGeometry.

OGRErr OGRPoint::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:
poCT the transformation to apply.
Returns:
OGRERR_NONE on success or an error code.

Implements OGRGeometry.

References OGRGeometry::assignSpatialReference(), OGRCoordinateTransformation::GetTargetCS(), and OGRCoordinateTransformation::Transform().

int OGRPoint::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:

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