OGR
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#include <ogr_geometry.h>
Public Member Functions | |
virtual const char * | getGeometryName () const |
Fetch WKT name for geometry type. More... | |
virtual OGRGeometry * | clone () const |
Make a copy of this object. More... | |
virtual int | isClockwise () const |
Returns TRUE if the ring has clockwise winding (or less than 2 points) More... | |
virtual void | closeRings () |
Force rings to be closed. More... | |
virtual double | get_Area () const |
Compute area of ring. More... | |
virtual int | WkbSize () const |
Returns size of related binary representation. More... | |
virtual OGRErr | importFromWkb (unsigned char *, int=-1) |
Assign geometry from well known binary data. More... | |
virtual OGRErr | exportToWkb (OGRwkbByteOrder, unsigned char *, OGRwkbVariant=wkbVariantOgc) const |
Convert a geometry into well known binary format. More... | |
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OGRLineString () | |
Create an empty line string. | |
virtual OGRErr | importFromWkt (char **) |
Assign geometry from well known text data. More... | |
virtual OGRErr | exportToWkt (char **ppszDstText) const |
Convert a geometry into well known text format. More... | |
virtual int | getDimension () const |
Get the dimension of this object. More... | |
virtual void | empty () |
Clear geometry information. This restores the geometry to it's initial state after construction, and before assignment of actual geometry. More... | |
virtual void | getEnvelope (OGREnvelope *psEnvelope) const |
Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure. More... | |
virtual void | getEnvelope (OGREnvelope3D *psEnvelope) const |
Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure. More... | |
virtual OGRBoolean | IsEmpty () const |
Returns TRUE (non-zero) if the object has no points. More... | |
virtual double | get_Length () const |
Returns the length of the curve. More... | |
virtual void | StartPoint (OGRPoint *) const |
Return the curve start point. More... | |
virtual void | EndPoint (OGRPoint *) const |
Return the curve end point. More... | |
virtual void | Value (double, OGRPoint *) const |
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... | |
int | getNumPoints () const |
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... | |
virtual OGRBoolean | Equals (OGRGeometry *) const |
Returns TRUE if two geometries are equivalent. More... | |
virtual void | setCoordinateDimension (int nDimension) |
Set the 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, 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 | setPoints (int, double *padfX, double *padfY, double *padfZ=NULL) |
Assign all points in a line string. More... | |
void | addPoint (OGRPoint *) |
Add a point to a line string. More... | |
void | addPoint (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 | 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 OGRwkbGeometryType | getGeometryType () const |
Fetch geometry type. More... | |
virtual OGRErr | transform (OGRCoordinateTransformation *poCT) |
Apply arbitrary coordinate transformation to geometry. More... | |
virtual void | flattenTo2D () |
Convert geometry to strictly 2D. In a sense this converts all Z coordinates to 0.0. More... | |
virtual void | segmentize (double dfMaxLength) |
Modify the geometry such it has no segment longer then the given distance. More... | |
virtual void | swapXY () |
Swap x and y coordinates. More... | |
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virtual int | get_IsClosed () const |
Return TRUE if curve is closed. More... | |
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virtual int | getCoordinateDimension () 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... | |
virtual OGRBoolean | IsRing () const |
Test if the geometry is a ring. 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... | |
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 (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 |
Compute boundary. More... | |
virtual double | Distance (const OGRGeometry *) const |
Compute distance between two geometries. More... | |
virtual OGRGeometry * | ConvexHull () const |
Compute convex hull. More... | |
virtual OGRGeometry * | Buffer (double dfDist, int nQuadSegs=30) const |
Compute buffer of geometry. More... | |
virtual OGRGeometry * | Intersection (const OGRGeometry *) const |
Compute intersection. More... | |
virtual OGRGeometry * | Union (const OGRGeometry *) const |
Compute union. More... | |
virtual OGRGeometry * | UnionCascaded () const |
Compute union using cascading. More... | |
virtual OGRGeometry * | Difference (const OGRGeometry *) const |
Compute difference. More... | |
virtual OGRGeometry * | SymDifference (const OGRGeometry *) const |
Compute symmetric difference. More... | |
virtual OGRErr | Centroid (OGRPoint *poPoint) const |
Compute the geometry centroid. More... | |
virtual OGRGeometry * | Simplify (double dTolerance) const |
Simplify the geometry. More... | |
OGRGeometry * | SimplifyPreserveTopology (double dTolerance) const |
Simplify the geometry while preserving topology. More... | |
virtual OGRGeometry * | Polygonize () const |
Polygonizes a set of sparse edges. More... | |
virtual OGRGeometry * | SymmetricDifference (const OGRGeometry *) const CPL_WARN_DEPRECATED("Non standard method. Use SymDifference() instead") |
Compute symmetric difference (deprecated) More... | |
virtual OGRGeometry * | getBoundary () const CPL_WARN_DEPRECATED("Non standard method. Use Boundary() instead") |
Compute boundary (deprecated) More... | |
Friends | |
class | OGRPolygon |
Concrete representation of a closed ring.
This class is functionally equivelent to an OGRLineString, but has a separate identity to maintain alignment with the OpenGIS simple feature data model. It exists to serve as a component of an OGRPolygon.
The OGRLinearRing has no corresponding free standing well known binary representation, so importFromWkb() and exportToWkb() will not actually work. There is a non-standard GDAL WKT representation though.
Because OGRLinearRing is not a "proper" free standing simple features object, it cannot be directly used on a feature via SetGeometry(), and cannot genearally be used with GEOS for operations like Intersects(). Instead the polygon should be used, or the OGRLinearRing should be converted to an OGRLineString for such operations.
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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().
Reimplemented from OGRLineString.
References OGRGeometry::assignSpatialReference(), OGRGeometry::getSpatialReference(), and OGRLineString::setPoints().
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Force rings to be closed.
If this geometry, or any contained geometries has polygon rings that are not closed, they will be closed by adding the starting point at the end.
Reimplemented from OGRGeometry.
References OGRLineString::addPoint(), OGRLineString::getPoint(), OGRLineString::getX(), OGRLineString::getY(), and OGRLineString::getZ().
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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().
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. |
Reimplemented from OGRLineString.
References CPLError(), and OGRLineString::setNumPoints().
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Compute area of ring.
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.
References CPLDebug(), OGRLineString::getEnvelope(), OGRLineString::getNumPoints(), OGRPoint::getX(), OGRLineString::getX(), OGRPoint::getY(), and OGRLineString::getY().
Referenced by OGRPolygon::get_Area().
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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().
Reimplemented from OGRLineString.
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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 zero if not known. |
Reimplemented from OGRLineString.
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Returns TRUE if the ring has clockwise winding (or less than 2 points)
References OGRLineString::getPoint(), and OGRLineString::setPoint().
Referenced by OGRGeometryFactory::organizePolygons().
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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().
Reimplemented from OGRLineString.