GDAL

Abstract curve base class for OGRLineString and OGRCircularString. More...
#include <ogr_geometry.h>
Public Member Functions  
OGRSimpleCurve &  operator= (const OGRSimpleCurve &other) 
Assignment operator. More...  
virtual int  WkbSize () const override 
Returns size of related binary representation. 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...  
virtual OGRErr  importFromWkt (char **) override 
Assign geometry from well known text data. More...  
virtual OGRErr  exportToWkt (char **ppszDstText, OGRwkbVariant=wkbVariantOldOgc) const override 
Convert a geometry into well known text format. More...  
virtual OGRGeometry *  clone () const override 
Make a copy of this object. More...  
virtual void  empty () override 
Clear geometry information. 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 OGRBoolean  IsEmpty () const override 
Returns TRUE (nonzero) if the object has no points. More...  
virtual double  get_Length () const override 
Returns the length of the curve. 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 void  Value (double, OGRPoint *) const override 
Fetch point at given distance along curve. 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 (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, OGRRawPoint *, double *=nullptr) 
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=nullptr) 
Assign all points in a line string. More...  
void  setPointsM (int, double *padfX, double *padfY, double *padfMIn=nullptr) 
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 *=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  segmentize (double dfMaxLength) override 
Modify the geometry such it has no segment longer then the given distance. More...  
virtual void  swapXY () 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 OGRLineString *  CurveToLine (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=nullptr) const =0 
Return a linestring from a curve geometry. 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...  
virtual double  get_Area () const =0 
Get the area of the (closed) curve. More...  
Public Member Functions inherited from OGRGeometry  
OGRGeometry (const OGRGeometry &other)  
Copy constructor. More...  
OGRGeometry &  operator= (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...  
OGRErr  importFromWkb (unsigned char *, int=1, OGRwkbVariant=wkbVariantOldOgc) 
Assign geometry from well known binary data. More...  
virtual OGRwkbGeometryType  getGeometryType () const =0 
Fetch geometry type. More...  
OGRwkbGeometryType  getIsoGeometryType () const 
Get the geometry type that conforms with ISO SQL/MM Part3. More...  
virtual const char *  getGeometryName () const =0 
Fetch WKT name for geometry type. 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 OGRBoolean  hasCurveGeometry (int bLookForNonLinear=FALSE) const 
Returns if this geometry is or has curve geometry. More...  
virtual OGRGeometry *  getCurveGeometry (const char *const *papszOptions=nullptr) const CPL_WARN_UNUSED_RESULT 
Return curve version of this geometry. More...  
virtual OGRGeometry *  getLinearGeometry (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=nullptr) const CPL_WARN_UNUSED_RESULT 
Return, possibly approximate, noncurve 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...  
Protected Member Functions  
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...  
Additional Inherited Members  
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...  
Abstract curve base class for OGRLineString and OGRCircularString.
Note: this class does not exist in SQL/MM standard and exists for implementation convenience.

protected 
Copy constructor.
Note: before GDAL 2.1, only the default implementation of the constructor existed, which could be unsafe to use.
void OGRSimpleCurve::addPoint  (  const OGRPoint *  poPoint  ) 
Add a point to a line string.
The vertex count of the line string is increased by one, and assigned from the passed location value.
There is no SFCOM analog to this method.
poPoint  the point to assign to the new vertex. 
void OGRSimpleCurve::addPoint  (  double  x, 
double  y  
) 
Add a point to a line string.
The vertex count of the line string is increased by one, and assigned from the passed location value.
There is no SFCOM analog to this method.
x  the X coordinate to assign to the new point. 
y  the Y coordinate to assign to the new point. 
void OGRSimpleCurve::addPoint  (  double  x, 
double  y,  
double  z  
) 
Add a point to a line string.
The vertex count of the line string is increased by one, and assigned from the passed location value.
There is no SFCOM analog to this method.
x  the X coordinate to assign to the new point. 
y  the Y coordinate to assign to the new point. 
z  the Z coordinate to assign to the new point (defaults to zero). 
void OGRSimpleCurve::addPoint  (  double  x, 
double  y,  
double  z,  
double  m  
) 
Add a point to a line string.
The vertex count of the line string is increased by one, and assigned from the passed location value.
There is no SFCOM analog to this method.
x  the X coordinate to assign to the new point. 
y  the Y coordinate to assign to the new point. 
z  the Z coordinate to assign to the new point (defaults to zero). 
m  the M coordinate to assign to the new point (defaults to zero). 
void OGRSimpleCurve::addPointM  (  double  x, 
double  y,  
double  m  
) 
Add a point to a line string.
The vertex count of the line string is increased by one, and assigned from the passed location value.
There is no SFCOM analog to this method.
x  the X coordinate to assign to the new point. 
y  the Y coordinate to assign to the new point. 
m  the M coordinate to assign to the new point. 
void OGRSimpleCurve::addSubLineString  (  const OGRLineString *  poOtherLine, 
int  nStartVertex = 0 , 

int  nEndVertex = 1 

) 
Add a segment of another linestring to this one.
Adds the request range of vertices to the end of this line string in an efficient manner. If the nStartVertex is larger than the nEndVertex then the vertices will be reversed as they are copied.
poOtherLine  the other OGRLineString. 
nStartVertex  the first vertex to copy, defaults to 0 to start with the first vertex in the other linestring. 
nEndVertex  the last vertex to copy, defaults to 1 indicating the last vertex of the other line string. 

overridevirtual 
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().
Implements OGRGeometry.
Reimplemented in OGRLinearRing.

overridevirtual 
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.

overridevirtual 
Return the curve end point.
This method relates to the SF COM ICurve::get_EndPoint() method.
poPoint  the point to be assigned the end location. 
Implements OGRCurve.

overridevirtual 
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 subgeometries 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().
Implements OGRGeometry.

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.
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. 
Implements OGRGeometry.
Reimplemented in OGRCircularString, and OGRLinearRing.

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().
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 :

Implements OGRGeometry.
Reimplemented in OGRCircularString.

overridevirtual 
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.

overridevirtual 
Returns the length of the curve.
This method relates to the SFCOM ICurve::get_Length() method.
Implements OGRCurve.
Reimplemented in OGRCircularString.

protectedvirtual 
Compute area of ring / closed linestring.
The area is computed according to Green's Theorem:
Area is "Sum(x(i)*(y(i+1)  y(i1)))/2" for i = 0 to pointCount1, assuming the last point is a duplicate of the first.

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().
psEnvelope  the structure in which to place the results. 
Implements OGRGeometry.
Reimplemented in OGRCircularString.

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().
psEnvelope  the structure in which to place the results. 
Implements OGRGeometry.
Reimplemented in OGRCircularString.
double OGRSimpleCurve::getM  (  int  iVertex  )  const 
Get measure at vertex.
Returns the M (measure) value at the indicated vertex. If no M value is available, 0.0 is returned. If iVertex is out of range a crash may occur, no internal range checking is performed.
iVertex  the vertex to return, between 0 and getNumPoints()1. 

inlineoverridevirtual 
Fetch vertex count.
Returns the number of vertices in the line string.
Implements OGRCurve.
void OGRSimpleCurve::getPoint  (  int  i, 
OGRPoint *  poPoint  
)  const 
Fetch a point in line string.
This method relates to the SFCOM ILineString::get_Point() method.
i  the vertex to fetch, from 0 to getNumPoints()1. 
poPoint  a point to initialize with the fetched point. 

overridevirtual 
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().
Implements OGRCurve.
void OGRSimpleCurve::getPoints  (  OGRRawPoint *  paoPointsOut, 
double *  padfZOut = nullptr 

)  const 
Returns all points of line string.
This method copies all points into user list. This list must be at least sizeof(OGRRawPoint) * OGRGeometry::getNumPoints() byte in size. It also copies all Z coordinates.
There is no SFCOM analog to this method.
paoPointsOut  a buffer into which the points is written. 
padfZOut  the Z values that go with the points (optional, may be NULL). 
void OGRSimpleCurve::getPoints  (  void *  pabyX, 
int  nXStride,  
void *  pabyY,  
int  nYStride,  
void *  pabyZ = nullptr , 

int  nZStride = 0 

)  const 
Returns all points of line string.
This method copies all points into user arrays. The user provides the stride between 2 consecutive elements of the array.
On some CPU architectures, care must be taken so that the arrays are properly aligned.
There is no SFCOM analog to this method.
pabyX  a buffer of at least (sizeof(double) * nXStride * nPointCount) bytes, may be NULL. 
nXStride  the number of bytes between 2 elements of pabyX. 
pabyY  a buffer of at least (sizeof(double) * nYStride * nPointCount) bytes, may be NULL. 
nYStride  the number of bytes between 2 elements of pabyY. 
pabyZ  a buffer of at last size (sizeof(double) * nZStride * nPointCount) bytes, may be NULL. 
nZStride  the number of bytes between 2 elements of pabyZ. 
void OGRSimpleCurve::getPoints  (  void *  pabyX, 
int  nXStride,  
void *  pabyY,  
int  nYStride,  
void *  pabyZ,  
int  nZStride,  
void *  pabyM,  
int  nMStride  
)  const 
Returns all points of line string.
This method copies all points into user arrays. The user provides the stride between 2 consecutive elements of the array.
On some CPU architectures, care must be taken so that the arrays are properly aligned.
There is no SFCOM analog to this method.
pabyX  a buffer of at least (sizeof(double) * nXStride * nPointCount) bytes, may be NULL. 
nXStride  the number of bytes between 2 elements of pabyX. 
pabyY  a buffer of at least (sizeof(double) * nYStride * nPointCount) bytes, may be NULL. 
nYStride  the number of bytes between 2 elements of pabyY. 
pabyZ  a buffer of at last size (sizeof(double) * nZStride * nPointCount) bytes, may be NULL. 
nZStride  the number of bytes between 2 elements of pabyZ. 
pabyM  a buffer of at last size (sizeof(double) * nMStride * nPointCount) bytes, may be NULL. 
nMStride  the number of bytes between 2 elements of pabyM. 

virtual 
Get the portion of linestring.
The portion of the linestring extracted to new one. The input distances (maybe present as ratio of length of linestring) set begin and end of extracted portion.
dfDistanceFrom  The distance from the origin of linestring, where the subline should begins 
dfDistanceTo  The distance from the origin of linestring, where the subline should ends 
bAsRatio  The flag indicating that distances are the ratio of the linestring length. 

inline 
Get X at vertex.
Returns the X value at the indicated vertex. If iVertex is out of range a crash may occur, no internal range checking is performed.
iVertex  the vertex to return, between 0 and getNumPoints()1. 

inline 
Get Y at vertex.
Returns the Y value at the indicated vertex. If iVertex is out of range a crash may occur, no internal range checking is performed.
iVertex  the vertex to return, between 0 and getNumPoints()1. 
double OGRSimpleCurve::getZ  (  int  iVertex  )  const 
Get Z at vertex.
Returns the Z (elevation) value at the indicated vertex. If no Z value is available, 0.0 is returned. If iVertex is out of range a crash may occur, no internal range checking is performed.
iVertex  the vertex to return, between 0 and getNumPoints()1. 

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().
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. 
Implements OGRGeometry.
Reimplemented in OGRCircularString, and OGRLinearRing.

overridevirtual 
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().
ppszInput  pointer to a pointer to the source text. The pointer is updated to pointer after the consumed text. 
Implements OGRGeometry.
Reimplemented in OGRCircularString.

overridevirtual 
Returns TRUE (nonzero) 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.
Implements OGRGeometry.
OGRSimpleCurve & OGRSimpleCurve::operator=  (  const OGRSimpleCurve &  other  ) 
Assignment operator.
Note: before GDAL 2.1, only the default implementation of the operator existed, which could be unsafe to use.

virtual 
Project point on linestring.
The input point projected on linestring. This is the shortest distance from point to the linestring. The distance from begin of linestring to the point projection returned.
This method is built on the GEOS library (GEOS >= 3.2.0), check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return 1, issuing a CPLE_NotSupported error.
void OGRSimpleCurve::reversePoints  (  void  ) 
Reverse point order.
This method updates the points in this line string in place reversing the point ordering (first for last, etc).

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()
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.
dfMaxLength  maximum length between 2 consecutive vertices. 
Reimplemented from OGRGeometry.
Reimplemented in OGRCircularString.

overridevirtual 
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.
bIs3D  Should the geometry have a Z dimension, either TRUE or FALSE. 
Reimplemented from OGRGeometry.

overridevirtual 
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.
nNewDimension  New coordinate dimension value, either 2 or 3. 
Reimplemented from OGRGeometry.
void OGRSimpleCurve::setM  (  int  iPoint, 
double  mIn  
) 
Set the M of a vertex in line string.
If iPoint is larger than the number of necessary the number of existing points in the line string, the point count will be increased to accommodate the request.
There is no SFCOM analog to this method.
iPoint  the index of the vertex to assign (zero based). 
mIn  input M coordinate to assign. 

overridevirtual 
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.
bIsMeasured  Should the geometry have a M dimension, either TRUE or FALSE. 
Reimplemented from OGRGeometry.
void OGRSimpleCurve::setNumPoints  (  int  nNewPointCount, 
int  bZeroizeNewContent = TRUE 

) 
Set number of points in geometry.
This method primary exists to preset the number of points in a linestring geometry before setPoint() is used to assign them to avoid reallocating the array larger with each call to addPoint().
This method has no SFCOM analog.
nNewPointCount  the new number of points for geometry. 
bZeroizeNewContent  whether to set to zero the new elements of arrays that are extended. 
void OGRSimpleCurve::setPoint  (  int  iPoint, 
OGRPoint *  poPoint  
) 
Set the location of a vertex in line string.
If iPoint is larger than the number of necessary the number of existing points in the line string, the point count will be increased to accommodate the request.
There is no SFCOM analog to this method.
iPoint  the index of the vertex to assign (zero based). 
poPoint  the value to assign to the vertex. 
void OGRSimpleCurve::setPoint  (  int  iPoint, 
double  xIn,  
double  yIn  
) 
Set the location of a vertex in line string.
If iPoint is larger than the number of necessary the number of existing points in the line string, the point count will be increased to accommodate the request.
There is no SFCOM analog to this method.
iPoint  the index of the vertex to assign (zero based). 
xIn  input X coordinate to assign. 
yIn  input Y coordinate to assign. 
void OGRSimpleCurve::setPoint  (  int  iPoint, 
double  xIn,  
double  yIn,  
double  zIn  
) 
Set the location of a vertex in line string.
If iPoint is larger than the number of necessary the number of existing points in the line string, the point count will be increased to accommodate the request.
There is no SFCOM analog to this method.
iPoint  the index of the vertex to assign (zero based). 
xIn  input X coordinate to assign. 
yIn  input Y coordinate to assign. 
zIn  input Z coordinate to assign (defaults to zero). 
void OGRSimpleCurve::setPoint  (  int  iPoint, 
double  xIn,  
double  yIn,  
double  zIn,  
double  mIn  
) 
Set the location of a vertex in line string.
If iPoint is larger than the number of necessary the number of existing points in the line string, the point count will be increased to accommodate the request.
There is no SFCOM analog to this method.
iPoint  the index of the vertex to assign (zero based). 
xIn  input X coordinate to assign. 
yIn  input Y coordinate to assign. 
zIn  input Z coordinate to assign (defaults to zero). 
mIn  input M coordinate to assign (defaults to zero). 
void OGRSimpleCurve::setPointM  (  int  iPoint, 
double  xIn,  
double  yIn,  
double  mIn  
) 
Set the location of a vertex in line string.
If iPoint is larger than the number of necessary the number of existing points in the line string, the point count will be increased to accommodate the request.
There is no SFCOM analog to this method.
iPoint  the index of the vertex to assign (zero based). 
xIn  input X coordinate to assign. 
yIn  input Y coordinate to assign. 
mIn  input M coordinate to assign (defaults to zero). 
void OGRSimpleCurve::setPoints  (  int  nPointsIn, 
OGRRawPoint *  paoPointsIn,  
double *  padfZIn = nullptr 

) 
Assign all points in a line string.
This method clears any existing points assigned to this line string, and assigns a whole new set. It is the most efficient way of assigning the value of a line string.
There is no SFCOM analog to this method.
nPointsIn  number of points being passed in paoPointsIn 
paoPointsIn  list of points being assigned. 
padfZIn  the Z values that go with the points (optional, may be NULL). 
void OGRSimpleCurve::setPoints  (  int  nPointsIn, 
OGRRawPoint *  paoPointsIn,  
double *  padfZIn,  
double *  padfMIn  
) 
Assign all points in a line string.
This method clears any existing points assigned to this line string, and assigns a whole new set. It is the most efficient way of assigning the value of a line string.
There is no SFCOM analog to this method.
nPointsIn  number of points being passed in paoPointsIn 
paoPointsIn  list of points being assigned. 
padfZIn  the Z values that go with the points. 
padfMIn  the M values that go with the points. 
void OGRSimpleCurve::setPoints  (  int  nPointsIn, 
double *  padfX,  
double *  padfY,  
double *  padfZIn = nullptr 

) 
Assign all points in a line string.
This method clear any existing points assigned to this line string, and assigns a whole new set.
There is no SFCOM analog to this method.
nPointsIn  number of points being passed in padfX and padfY. 
padfX  list of X coordinates of points being assigned. 
padfY  list of Y coordinates of points being assigned. 
padfZIn  list of Z coordinates of points being assigned (defaults to NULL for 2D objects). 
void OGRSimpleCurve::setPoints  (  int  nPointsIn, 
double *  padfX,  
double *  padfY,  
double *  padfZIn,  
double *  padfMIn  
) 
Assign all points in a line string.
This method clear any existing points assigned to this line string, and assigns a whole new set.
There is no SFCOM analog to this method.
nPointsIn  number of points being passed in padfX and padfY. 
padfX  list of X coordinates of points being assigned. 
padfY  list of Y coordinates of points being assigned. 
padfZIn  list of Z coordinates of points being assigned. 
padfMIn  list of M coordinates of points being assigned. 
void OGRSimpleCurve::setPointsM  (  int  nPointsIn, 
OGRRawPoint *  paoPointsIn,  
double *  padfMIn  
) 
Assign all points in a line string.
This method clears any existing points assigned to this line string, and assigns a whole new set. It is the most efficient way of assigning the value of a line string.
There is no SFCOM analog to this method.
nPointsIn  number of points being passed in paoPointsIn 
paoPointsIn  list of points being assigned. 
padfMIn  the M values that go with the points. 
void OGRSimpleCurve::setPointsM  (  int  nPointsIn, 
double *  padfX,  
double *  padfY,  
double *  padfMIn = nullptr 

) 
Assign all points in a line string.
This method clear any existing points assigned to this line string, and assigns a whole new set.
There is no SFCOM analog to this method.
nPointsIn  number of points being passed in padfX and padfY. 
padfX  list of X coordinates of points being assigned. 
padfY  list of Y coordinates of points being assigned. 
padfMIn  list of M coordinates of points being assigned. 
void OGRSimpleCurve::setZ  (  int  iPoint, 
double  zIn  
) 
Set the Z of a vertex in line string.
If iPoint is larger than the number of necessary the number of existing points in the line string, the point count will be increased to accommodate the request.
There is no SFCOM analog to this method.
iPoint  the index of the vertex to assign (zero based). 
zIn  input Z coordinate to assign. 

overridevirtual 
Return the curve start point.
This method relates to the SF COM ICurve::get_StartPoint() method.
poPoint  the point to be assigned the start location. 
Implements OGRCurve.

overridevirtual 

overridevirtual 
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().
poCT  the transformation to apply. 
Implements OGRGeometry.
Reimplemented in OGRLinearRing.

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().
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. 
Implements OGRCurve.
Reimplemented in OGRCircularString.

overridevirtual 
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().
Implements OGRGeometry.
Reimplemented in OGRLinearRing.