GDAL
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OGRSimpleCurve Class Reference

Abstract curve base class for OGRLineString and OGRCircularString. More...

#include <ogr_geometry.h>

Inheritance diagram for OGRSimpleCurve:
OGRCurve OGRGeometry OGRCircularString OGRLineString OGRLinearRing

Public Member Functions

OGRSimpleCurveoperator= (const OGRSimpleCurve &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 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 segmentize (double dfMaxLength) CPL_OVERRIDE
 Modify the geometry such it has no segment longer then the given distance. 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 OGRLineStringCurveToLine (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=NULL) const =0
 Return a linestring from a curve geometry. 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...
 
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...
 
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...
 
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 *=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 OGRBoolean hasCurveGeometry (int bLookForNonLinear=FALSE) const
 Returns if this geometry is or has curve geometry. More...
 
virtual OGRGeometrygetCurveGeometry (const char *const *papszOptions=NULL) const CPL_WARN_UNUSED_RESULT
 Return curve version of this geometry. More...
 
virtual OGRGeometrygetLinearGeometry (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=NULL) const CPL_WARN_UNUSED_RESULT
 Return, possibly approximate, non-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...
 

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 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 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...
 

Detailed Description

Abstract curve base class for OGRLineString and OGRCircularString.

Note: this class does not exist in SQL/MM standard and exists for implementation convenience.

Since
GDAL 2.0

Constructor & Destructor Documentation

OGRSimpleCurve::OGRSimpleCurve ( const OGRSimpleCurve other)
protected

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

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.

Parameters
poPointthe 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.

Parameters
xthe X coordinate to assign to the new point.
ythe 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.

Parameters
xthe X coordinate to assign to the new point.
ythe Y coordinate to assign to the new point.
zthe 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.

Parameters
xthe X coordinate to assign to the new point.
ythe Y coordinate to assign to the new point.
zthe Z coordinate to assign to the new point (defaults to zero).
mthe 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.

Parameters
xthe X coordinate to assign to the new point.
ythe Y coordinate to assign to the new point.
mthe 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.

Parameters
poOtherLinethe other OGRLineString.
nStartVertexthe first vertex to copy, defaults to 0 to start with the first vertex in the other linestring.
nEndVertexthe last vertex to copy, defaults to -1 indicating the last vertex of the other line string.
OGRGeometry * OGRSimpleCurve::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.

Reimplemented in OGRLinearRing.

void OGRSimpleCurve::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 OGRSimpleCurve::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 OGRSimpleCurve::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 OGRSimpleCurve::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.

Reimplemented in OGRCircularString, and OGRLinearRing.

OGRErr OGRSimpleCurve::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.

Reimplemented in OGRCircularString.

void OGRSimpleCurve::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 OGRSimpleCurve::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.

Reimplemented in OGRCircularString.

double OGRSimpleCurve::get_LinearArea ( ) const
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(i-1)))/2" for i = 0 to pointCount-1, assuming the last point is a duplicate of the first.

Returns
computed area.
void OGRSimpleCurve::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.

Reimplemented in OGRCircularString.

void OGRSimpleCurve::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.

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.

Parameters
iVertexthe vertex to return, between 0 and getNumPoints()-1.
Returns
M value.
int OGRSimpleCurve::getNumPoints ( ) const
inlinevirtual

Fetch vertex count.

Returns the number of vertices in the line string.

Returns
vertex count.

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.

Parameters
ithe vertex to fetch, from 0 to getNumPoints()-1.
poPointa point to initialize with the fetched point.
OGRPointIterator * OGRSimpleCurve::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.

void OGRSimpleCurve::getPoints ( OGRRawPoint paoPointsOut,
double *  padfZOut = NULL 
) 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.

Parameters
paoPointsOuta buffer into which the points is written.
padfZOutthe Z values that go with the points (optional, may be NULL).
void OGRSimpleCurve::getPoints ( void *  pabyX,
int  nXStride,
void *  pabyY,
int  nYStride,
void *  pabyZ = NULL,
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.

Parameters
pabyXa buffer of at least (sizeof(double) * nXStride * nPointCount) bytes, may be NULL.
nXStridethe number of bytes between 2 elements of pabyX.
pabyYa buffer of at least (sizeof(double) * nYStride * nPointCount) bytes, may be NULL.
nYStridethe number of bytes between 2 elements of pabyY.
pabyZa buffer of at last size (sizeof(double) * nZStride * nPointCount) bytes, may be NULL.
nZStridethe number of bytes between 2 elements of pabyZ.
Since
OGR 1.9.0
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.

Parameters
pabyXa buffer of at least (sizeof(double) * nXStride * nPointCount) bytes, may be NULL.
nXStridethe number of bytes between 2 elements of pabyX.
pabyYa buffer of at least (sizeof(double) * nYStride * nPointCount) bytes, may be NULL.
nYStridethe number of bytes between 2 elements of pabyY.
pabyZa buffer of at last size (sizeof(double) * nZStride * nPointCount) bytes, may be NULL.
nZStridethe number of bytes between 2 elements of pabyZ.
pabyMa buffer of at last size (sizeof(double) * nMStride * nPointCount) bytes, may be NULL.
nMStridethe number of bytes between 2 elements of pabyM.
Since
OGR 2.1.0
OGRLineString * OGRSimpleCurve::getSubLine ( double  dfDistanceFrom,
double  dfDistanceTo,
int  bAsRatio 
) const
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.

Parameters
dfDistanceFromThe distance from the origin of linestring, where the subline should begins
dfDistanceToThe distance from the origin of linestring, where the subline should ends
bAsRatioThe flag indicating that distances are the ratio of the linestring length.
Returns
a newly allocated linestring now owned by the caller, or NULL on failure.
Since
OGR 1.11.0
double OGRSimpleCurve::getX ( int  iVertex) const
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.

Parameters
iVertexthe vertex to return, between 0 and getNumPoints()-1.
Returns
X value.
double OGRSimpleCurve::getY ( int  iVertex) const
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.

Parameters
iVertexthe vertex to return, between 0 and getNumPoints()-1.
Returns
X value.
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.

Parameters
iVertexthe vertex to return, between 0 and getNumPoints()-1.
Returns
Z value.
OGRErr OGRSimpleCurve::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.

Reimplemented in OGRCircularString, and OGRLinearRing.

OGRErr OGRSimpleCurve::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.

Reimplemented in OGRCircularString.

OGRBoolean OGRSimpleCurve::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.

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.

Since
GDAL 2.1
double OGRSimpleCurve::Project ( const OGRPoint ) const
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.

Returns
a distance from the begin of the linestring to the projected point.
Since
OGR 1.11.0
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).

void OGRSimpleCurve::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.

Reimplemented in OGRCircularString.

void OGRSimpleCurve::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 OGRSimpleCurve::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 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.

Parameters
iPointthe index of the vertex to assign (zero based).
mIninput M coordinate to assign.
void OGRSimpleCurve::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 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.

Parameters
nNewPointCountthe new number of points for geometry.
bZeroizeNewContentwhether 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.

Parameters
iPointthe index of the vertex to assign (zero based).
poPointthe 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.

Parameters
iPointthe index of the vertex to assign (zero based).
xIninput X coordinate to assign.
yIninput 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.

Parameters
iPointthe index of the vertex to assign (zero based).
xIninput X coordinate to assign.
yIninput Y coordinate to assign.
zIninput 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.

Parameters
iPointthe index of the vertex to assign (zero based).
xIninput X coordinate to assign.
yIninput Y coordinate to assign.
zIninput Z coordinate to assign (defaults to zero).
mIninput 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.

Parameters
iPointthe index of the vertex to assign (zero based).
xIninput X coordinate to assign.
yIninput Y coordinate to assign.
mIninput M coordinate to assign (defaults to zero).
void OGRSimpleCurve::setPoints ( int  nPointsIn,
OGRRawPoint paoPointsIn,
double *  padfZIn = NULL 
)

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.

Parameters
nPointsInnumber of points being passed in paoPointsIn
paoPointsInlist of points being assigned.
padfZInthe 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.

Parameters
nPointsInnumber of points being passed in paoPointsIn
paoPointsInlist of points being assigned.
padfZInthe Z values that go with the points.
padfMInthe M values that go with the points.
void OGRSimpleCurve::setPoints ( int  nPointsIn,
double *  padfX,
double *  padfY,
double *  padfZIn = NULL 
)

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.

Parameters
nPointsInnumber of points being passed in padfX and padfY.
padfXlist of X coordinates of points being assigned.
padfYlist of Y coordinates of points being assigned.
padfZInlist 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.

Parameters
nPointsInnumber of points being passed in padfX and padfY.
padfXlist of X coordinates of points being assigned.
padfYlist of Y coordinates of points being assigned.
padfZInlist of Z coordinates of points being assigned.
padfMInlist 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.

Parameters
nPointsInnumber of points being passed in paoPointsIn
paoPointsInlist of points being assigned.
padfMInthe M values that go with the points.
void OGRSimpleCurve::setPointsM ( int  nPointsIn,
double *  padfX,
double *  padfY,
double *  padfMIn = NULL 
)

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.

Parameters
nPointsInnumber of points being passed in padfX and padfY.
padfXlist of X coordinates of points being assigned.
padfYlist of Y coordinates of points being assigned.
padfMInlist 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.

Parameters
iPointthe index of the vertex to assign (zero based).
zIninput Z coordinate to assign.
void OGRSimpleCurve::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.

void OGRSimpleCurve::swapXY ( )
virtual

Swap x and y coordinates.

Since
OGR 1.8.0

Reimplemented from OGRGeometry.

OGRErr OGRSimpleCurve::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.

Reimplemented in OGRLinearRing.

void OGRSimpleCurve::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.

Reimplemented in OGRCircularString.

int OGRSimpleCurve::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.

Reimplemented in OGRLinearRing.


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

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