GDAL
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Abstract curve base class for OGRLineString, OGRCircularString and OGRCompoundCurve. More...
#include <ogr_geometry.h>
Public Types | |
typedef OGRPoint | ChildType |
Type of child elements. | |
Public Member Functions | |
ConstIterator | begin () const |
Return begin of a point iterator. | |
ConstIterator | end () const |
Return end of a point iterator. | |
virtual OGRCurve * | clone () const override=0 |
Make a copy of this object. | |
virtual double | get_Length () const =0 |
Returns the length of the curve. | |
virtual void | StartPoint (OGRPoint *) const =0 |
Return the curve start point. | |
virtual void | EndPoint (OGRPoint *) const =0 |
Return the curve end point. | |
virtual int | get_IsClosed () const |
Return TRUE if curve is closed. | |
virtual void | Value (double, OGRPoint *) const =0 |
Fetch point at given distance along curve. | |
virtual OGRLineString * | CurveToLine (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=nullptr) const =0 |
Return a linestring from a curve geometry. | |
virtual int | getDimension () const override |
Get the dimension of this object. | |
virtual int | getNumPoints () const =0 |
Return the number of points of a curve geometry. | |
virtual OGRPointIterator * | getPointIterator () const =0 |
Returns a point iterator over the curve. | |
virtual OGRBoolean | IsConvex () const |
Returns if a (closed) curve forms a convex shape. | |
virtual double | get_Area () const =0 |
Get the area of the (closed) curve. | |
virtual double | get_GeodesicArea (const OGRSpatialReference *poSRSOverride=nullptr) const =0 |
Get the area of the (closed) curve, considered as a surface on the underlying ellipsoid of the SRS attached to the geometry. | |
virtual double | get_GeodesicLength (const OGRSpatialReference *poSRSOverride=nullptr) const =0 |
Get the length of the curve, considered as a geodesic line on the underlying ellipsoid of the SRS attached to the geometry. | |
virtual int | isClockwise () const |
Returns TRUE if the ring has clockwise winding (or less than 2 points) | |
virtual void | reversePoints ()=0 |
Reverse point order. | |
OGRSimpleCurve * | toSimpleCurve () |
Down-cast to OGRSimpleCurve*. | |
const OGRSimpleCurve * | toSimpleCurve () const |
Down-cast to OGRSimpleCurve*. | |
bool | operator== (const OGRGeometry &other) const |
Returns if two geometries are equal. | |
bool | operator!= (const OGRGeometry &other) const |
Returns if two geometries are different. | |
virtual int | getCoordinateDimension () const |
Get the dimension of the coordinates in this object. | |
int | CoordinateDimension () const |
Get the dimension of the coordinates in this object. | |
virtual OGRBoolean | IsEmpty () const =0 |
Returns TRUE (non-zero) if the object has no points. | |
virtual OGRBoolean | IsValid () const |
Test if the geometry is valid. | |
virtual OGRGeometry * | MakeValid (CSLConstList papszOptions=nullptr) const |
Attempts to make an invalid geometry valid without losing vertices. | |
virtual OGRGeometry * | Normalize () const |
Attempts to bring geometry into normalized/canonical form. | |
virtual OGRBoolean | IsSimple () const |
Test if the geometry is simple. | |
OGRBoolean | Is3D () const |
OGRBoolean | IsMeasured () const |
virtual OGRBoolean | IsRing () const |
Test if the geometry is a ring. | |
virtual void | empty ()=0 |
Clear geometry information. | |
virtual void | getEnvelope (OGREnvelope *psEnvelope) const =0 |
Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure. | |
virtual void | getEnvelope (OGREnvelope3D *psEnvelope) const =0 |
Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure. | |
virtual size_t | WkbSize () const =0 |
Returns size of related binary representation. | |
OGRErr | importFromWkb (const GByte *, size_t=static_cast< size_t >(-1), OGRwkbVariant=wkbVariantOldOgc) |
Assign geometry from well known binary data. | |
virtual OGRErr | importFromWkb (const unsigned char *, size_t, OGRwkbVariant, size_t &nBytesConsumedOut)=0 |
Assign geometry from well known binary data. | |
OGRErr | exportToWkb (OGRwkbByteOrder, unsigned char *, OGRwkbVariant=wkbVariantOldOgc) const |
Convert a geometry into well known binary format. | |
virtual OGRErr | exportToWkb (unsigned char *, const OGRwkbExportOptions *=nullptr) const =0 |
Convert a geometry into well known binary format. | |
virtual OGRErr | importFromWkt (const char **ppszInput)=0 |
Assign geometry from well known text data. | |
OGRErr | importFromWkt (char **ppszInput) |
Deprecated. | |
OGRErr | exportToWkt (char **ppszDstText, OGRwkbVariant=wkbVariantOldOgc) const |
Convert a geometry into well known text format. | |
virtual std::string | exportToWkt (const OGRWktOptions &opts=OGRWktOptions(), OGRErr *err=nullptr) const =0 |
Export a WKT geometry. | |
virtual OGRwkbGeometryType | getGeometryType () const =0 |
Fetch geometry type. | |
OGRwkbGeometryType | getIsoGeometryType () const |
Get the geometry type that conforms with ISO SQL/MM Part3. | |
virtual const char * | getGeometryName () const =0 |
Fetch WKT name for geometry type. | |
void | dumpReadable (FILE *, const char *=nullptr, CSLConstList papszOptions=nullptr) const |
Dump geometry in well known text format to indicated output file. | |
std::string | dumpReadable (const char *=nullptr, CSLConstList papszOptions=nullptr) const |
Dump geometry in well known text format to indicated output file. | |
virtual void | flattenTo2D ()=0 |
Convert geometry to strictly 2D. | |
virtual char * | exportToGML (const char *const *papszOptions=nullptr) const |
Convert a geometry into GML format. | |
virtual char * | exportToKML () const |
Convert a geometry into KML format. | |
virtual char * | exportToJson (CSLConstList papszOptions=nullptr) const |
Convert a geometry into GeoJSON format. | |
virtual void | accept (IOGRGeometryVisitor *visitor)=0 |
Accept a visitor. | |
virtual void | accept (IOGRConstGeometryVisitor *visitor) const =0 |
Accept a visitor. | |
GEOSGeom | exportToGEOS (GEOSContextHandle_t hGEOSCtxt, bool bRemoveEmptyParts=false) const |
Returns a GEOSGeom object corresponding to the geometry. | |
virtual OGRBoolean | hasCurveGeometry (int bLookForNonLinear=FALSE) const |
Returns if this geometry is or has curve geometry. | |
virtual OGRGeometry * | getCurveGeometry (const char *const *papszOptions=nullptr) const |
Return curve version of this geometry. | |
virtual OGRGeometry * | getLinearGeometry (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=nullptr) const |
Return, possibly approximate, non-curve version of this geometry. | |
void | roundCoordinates (const OGRGeomCoordinatePrecision &sPrecision) |
Round coordinates of the geometry to the specified precision. | |
void | roundCoordinatesIEEE754 (const OGRGeomCoordinateBinaryPrecision &options) |
Round coordinates of a geometry, exploiting characteristics of the IEEE-754 double-precision binary representation. | |
virtual void | closeRings () |
Force rings to be closed. | |
virtual bool | setCoordinateDimension (int nDimension) |
Set the coordinate dimension. | |
virtual bool | set3D (OGRBoolean bIs3D) |
Add or remove the Z coordinate dimension. | |
virtual bool | setMeasured (OGRBoolean bIsMeasured) |
Add or remove the M coordinate dimension. | |
virtual void | assignSpatialReference (const OGRSpatialReference *poSR) |
Assign spatial reference to this object. | |
const OGRSpatialReference * | getSpatialReference (void) const |
Returns spatial reference system for object. | |
virtual OGRErr | transform (OGRCoordinateTransformation *poCT)=0 |
Apply arbitrary coordinate transformation to geometry. | |
OGRErr | transformTo (const OGRSpatialReference *poSR) |
Transform geometry to new spatial reference system. | |
virtual bool | segmentize (double dfMaxLength) |
Modify the geometry such it has no segment longer then the given distance. | |
virtual OGRBoolean | Intersects (const OGRGeometry *) const |
Do these features intersect? | |
virtual OGRBoolean | Equals (const OGRGeometry *) const =0 |
Returns TRUE if two geometries are equivalent. | |
virtual OGRBoolean | Disjoint (const OGRGeometry *) const |
Test for disjointness. | |
virtual OGRBoolean | Touches (const OGRGeometry *) const |
Test for touching. | |
virtual OGRBoolean | Crosses (const OGRGeometry *) const |
Test for crossing. | |
virtual OGRBoolean | Within (const OGRGeometry *) const |
Test for containment. | |
virtual OGRBoolean | Contains (const OGRGeometry *) const |
Test for containment. | |
virtual OGRBoolean | Overlaps (const OGRGeometry *) const |
Test for overlap. | |
virtual OGRGeometry * | Boundary () const |
Compute boundary. | |
virtual double | Distance (const OGRGeometry *) const |
Compute distance between two geometries. | |
virtual OGRGeometry * | ConvexHull () const |
Compute convex hull. | |
virtual OGRGeometry * | ConcaveHull (double dfRatio, bool bAllowHoles) const |
Compute "concave hull" of a geometry. | |
virtual OGRGeometry * | Buffer (double dfDist, int nQuadSegs=30) const |
Compute buffer of geometry. | |
virtual OGRGeometry * | BufferEx (double dfDistance, CSLConstList papszOptions) const |
Compute buffer of geometry. | |
virtual OGRGeometry * | Intersection (const OGRGeometry *) const |
Compute intersection. | |
virtual OGRGeometry * | Union (const OGRGeometry *) const |
Compute union. | |
virtual OGRGeometry * | UnionCascaded () const |
Compute union using cascading. | |
OGRGeometry * | UnaryUnion () const |
Returns the union of all components of a single geometry. | |
virtual OGRGeometry * | Difference (const OGRGeometry *) const |
Compute difference. | |
virtual OGRGeometry * | SymDifference (const OGRGeometry *) const |
Compute symmetric difference. | |
virtual OGRErr | Centroid (OGRPoint *poPoint) const |
Compute the geometry centroid. | |
virtual OGRGeometry * | Simplify (double dTolerance) const |
Simplify the geometry. | |
OGRGeometry * | SimplifyPreserveTopology (double dTolerance) const |
Simplify the geometry while preserving topology. | |
virtual OGRGeometry * | DelaunayTriangulation (double dfTolerance, int bOnlyEdges) const |
Return a Delaunay triangulation of the vertices of the geometry. | |
virtual OGRGeometry * | Polygonize () const |
Polygonizes a set of sparse edges. | |
virtual double | Distance3D (const OGRGeometry *poOtherGeom) const |
Returns the 3D distance between two geometries. | |
OGRGeometry * | SetPrecision (double dfGridSize, int nFlags) const |
Set the geometry's precision, rounding all its coordinates to the precision grid, and making sure the geometry is still valid. | |
virtual bool | hasEmptyParts () const |
Returns whether a geometry has empty parts/rings. | |
virtual void | removeEmptyParts () |
Remove empty parts/rings from this geometry. | |
virtual void | swapXY () |
Swap x and y coordinates. | |
bool | IsRectangle () const |
Returns whether the geometry is a polygon with 4 corners forming a rectangle. | |
OGRPoint * | toPoint () |
Down-cast to OGRPoint*. | |
const OGRPoint * | toPoint () const |
Down-cast to OGRPoint*. | |
OGRCurve * | toCurve () |
Down-cast to OGRCurve*. | |
const OGRCurve * | toCurve () const |
Down-cast to OGRCurve*. | |
OGRLineString * | toLineString () |
Down-cast to OGRLineString*. | |
const OGRLineString * | toLineString () const |
Down-cast to OGRLineString*. | |
OGRLinearRing * | toLinearRing () |
Down-cast to OGRLinearRing*. | |
const OGRLinearRing * | toLinearRing () const |
Down-cast to OGRLinearRing*. | |
OGRCircularString * | toCircularString () |
Down-cast to OGRCircularString*. | |
const OGRCircularString * | toCircularString () const |
Down-cast to OGRCircularString*. | |
OGRCompoundCurve * | toCompoundCurve () |
Down-cast to OGRCompoundCurve*. | |
const OGRCompoundCurve * | toCompoundCurve () const |
Down-cast to OGRCompoundCurve*. | |
OGRSurface * | toSurface () |
Down-cast to OGRSurface*. | |
const OGRSurface * | toSurface () const |
Down-cast to OGRSurface*. | |
OGRPolygon * | toPolygon () |
Down-cast to OGRPolygon*. | |
const OGRPolygon * | toPolygon () const |
Down-cast to OGRPolygon*. | |
OGRTriangle * | toTriangle () |
Down-cast to OGRTriangle*. | |
const OGRTriangle * | toTriangle () const |
Down-cast to OGRTriangle*. | |
OGRCurvePolygon * | toCurvePolygon () |
Down-cast to OGRCurvePolygon*. | |
const OGRCurvePolygon * | toCurvePolygon () const |
Down-cast to OGRCurvePolygon*. | |
OGRGeometryCollection * | toGeometryCollection () |
Down-cast to OGRGeometryCollection*. | |
const OGRGeometryCollection * | toGeometryCollection () const |
Down-cast to OGRGeometryCollection*. | |
OGRMultiPoint * | toMultiPoint () |
Down-cast to OGRMultiPoint*. | |
const OGRMultiPoint * | toMultiPoint () const |
Down-cast to OGRMultiPoint*. | |
OGRMultiLineString * | toMultiLineString () |
Down-cast to OGRMultiLineString*. | |
const OGRMultiLineString * | toMultiLineString () const |
Down-cast to OGRMultiLineString*. | |
OGRMultiPolygon * | toMultiPolygon () |
Down-cast to OGRMultiPolygon*. | |
const OGRMultiPolygon * | toMultiPolygon () const |
Down-cast to OGRMultiPolygon*. | |
OGRMultiCurve * | toMultiCurve () |
Down-cast to OGRMultiCurve*. | |
const OGRMultiCurve * | toMultiCurve () const |
Down-cast to OGRMultiCurve*. | |
OGRMultiSurface * | toMultiSurface () |
Down-cast to OGRMultiSurface*. | |
const OGRMultiSurface * | toMultiSurface () const |
Down-cast to OGRMultiSurface*. | |
OGRPolyhedralSurface * | toPolyhedralSurface () |
Down-cast to OGRPolyhedralSurface*. | |
const OGRPolyhedralSurface * | toPolyhedralSurface () const |
Down-cast to OGRPolyhedralSurface*. | |
OGRTriangulatedSurface * | toTriangulatedSurface () |
Down-cast to OGRTriangulatedSurface*. | |
const OGRTriangulatedSurface * | toTriangulatedSurface () const |
Down-cast to OGRTriangulatedSurface*. | |
Static Public Member Functions | |
static OGRCompoundCurve * | CastToCompoundCurve (OGRCurve *puCurve) |
Cast to compound curve. | |
static OGRLineString * | CastToLineString (OGRCurve *poCurve) |
Cast to linestring. | |
static OGRLinearRing * | CastToLinearRing (OGRCurve *poCurve) |
Cast to linear ring. | |
static GEOSContextHandle_t | createGEOSContext () |
Create a new GEOS context. | |
static void | freeGEOSContext (GEOSContextHandle_t hGEOSCtxt) |
Destroy a GEOS context. | |
static OGRGeometryH | ToHandle (OGRGeometry *poGeom) |
Convert a OGRGeometry* to a OGRGeometryH. | |
static OGRGeometry * | FromHandle (OGRGeometryH hGeom) |
Convert a OGRGeometryH to a OGRGeometry*. | |
Protected Member Functions | |
virtual int | ContainsPoint (const OGRPoint *p) const |
Returns if a point is contained in a (closed) curve. | |
virtual int | IntersectsPoint (const OGRPoint *p) const |
Returns if a point intersects a (closed) curve. | |
virtual double | get_AreaOfCurveSegments () const =0 |
Get the area of the purely curve portions of a (closed) curve. | |
Friends | |
ConstIterator | begin (const OGRCurve *) |
ConstIterator | end (const OGRCurve *) |
Abstract curve base class for OGRLineString, OGRCircularString and OGRCompoundCurve.
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pure virtualinherited |
Accept a visitor.
Implemented in OGRPoint, OGRLineString, OGRLinearRing, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRTriangulatedSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.
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pure virtualinherited |
Accept a visitor.
Implemented in OGRPoint, OGRLineString, OGRLinearRing, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRTriangulatedSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.
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virtualinherited |
Assign spatial reference to this object.
Any existing spatial reference is replaced, but under no circumstances does this result in the object being reprojected. It is just changing the interpretation of the existing geometry. Note that assigning a spatial reference increments the reference count on the OGRSpatialReference, but does not copy it.
Starting with GDAL 2.3, this will also assign the spatial reference to potential sub-geometries of the geometry (OGRGeometryCollection, OGRCurvePolygon/OGRPolygon, OGRCompoundCurve, OGRPolyhedralSurface and their derived classes).
This is similar to the SFCOM IGeometry::put_SpatialReference() method.
This method is the same as the C function OGR_G_AssignSpatialReference().
poSR | new spatial reference system to apply. |
Reimplemented in OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
OGRCurve::ConstIterator OGRCurve::begin | ( | ) | const |
Return begin of a point iterator.
Using this iterator for standard range-based loops is safe, but due to implementation limitations, you shouldn't try to access (dereference) more than one iterator step at a time, since you will get a reference to the same OGRPoint& object.
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virtualinherited |
Compute boundary.
A new geometry object is created and returned containing the boundary of the geometry on which the method is invoked.
This method is the same as the C function OGR_G_Boundary().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
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virtualinherited |
Compute buffer of geometry.
Builds a new geometry containing the buffer region around the geometry on which it is invoked. The buffer is a polygon containing the region within the buffer distance of the original geometry.
Some buffer sections are properly described as curves, but are converted to approximate polygons. The nQuadSegs parameter can be used to control how many segments should be used to define a 90 degree curve - a quadrant of a circle. A value of 30 is a reasonable default. Large values result in large numbers of vertices in the resulting buffer geometry while small numbers reduce the accuracy of the result.
This method is the same as the C function OGR_G_Buffer().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
dfDist | the buffer distance to be applied. Should be expressed into the same unit as the coordinates of the geometry. |
nQuadSegs | the number of segments used to approximate a 90 degree (quadrant) of curvature. |
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virtualinherited |
Compute buffer of geometry.
Builds a new geometry containing the buffer region around the geometry on which it is invoked. The buffer is a polygon containing the region within the buffer distance of the original geometry.
This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.
The following options are supported. See the GEOS library for more detailed descriptions.
This function is the same as the C function OGR_G_BufferEx().
dfDist | the buffer distance to be applied. Should be expressed into the same unit as the coordinates of the geometry. |
papszOptions | NULL terminated list of options (may be NULL) |
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static |
Cast to compound curve.
The passed in geometry is consumed and a new one returned (or NULL in case of failure)
poCurve | the input geometry - ownership is passed to the method. |
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static |
Cast to linear ring.
The passed in geometry is consumed and a new one returned (or NULL in case of failure)
poCurve | the input geometry - ownership is passed to the method. |
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static |
Cast to linestring.
The passed in geometry is consumed and a new one returned (or NULL in case of failure)
poCurve | the input geometry - ownership is passed to the method. |
Compute the geometry centroid.
The centroid location is applied to the passed in OGRPoint object. The centroid is not necessarily within the geometry.
This method relates to the SFCOM ISurface::get_Centroid() method however the current implementation based on GEOS can operate on other geometry types such as multipoint, linestring, geometrycollection such as multipolygons. OGC SF SQL 1.1 defines the operation for surfaces (polygons). SQL/MM-Part 3 defines the operation for surfaces and multisurfaces (multipolygons).
This function is the same as the C function OGR_G_Centroid().
This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.
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overridepure 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().
Implements OGRGeometry.
Implemented in OGRLineString, OGRLinearRing, OGRCircularString, OGRCompoundCurve, and OGRSimpleCurve.
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virtualinherited |
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 in OGRLinearRing, OGRPolygon, and OGRGeometryCollection.
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virtualinherited |
Compute "concave hull" of a geometry.
The concave hull is fully contained within the convex hull and also contains all the points of the input, but in a smaller area. The area ratio is the ratio of the area of the convex hull and the concave hull. Frequently used to convert a multi-point into a polygonal area. that contains all the points in the input Geometry.
A new geometry object is created and returned containing the concave hull of the geometry on which the method is invoked.
This method is the same as the C function OGR_G_ConcaveHull().
This method is built on the GEOS >= 3.11 library If OGR is built without the GEOS >= 3.11 librray, this method will always fail, issuing a CPLE_NotSupported error.
dfRatio | Ratio of the area of the convex hull and the concave hull. |
bAllowHoles | Whether holes are allowed. |
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virtualinherited |
Test for containment.
Tests if actual geometry object contains the passed geometry.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Contains().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the geometry to compare to this geometry. |
Reimplemented in OGRCurvePolygon.
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protectedvirtual |
Returns if a point is contained in a (closed) curve.
Final users should use OGRGeometry::Contains() instead.
p | the point to test |
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virtualinherited |
Compute convex hull.
A new geometry object is created and returned containing the convex hull of the geometry on which the method is invoked.
This method is the same as the C function OGR_G_ConvexHull().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
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inherited |
Get the dimension of the coordinates in this object.
This method is the same as the C function OGR_G_CoordinateDimension().
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staticinherited |
Create a new GEOS context.
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virtualinherited |
Test for crossing.
Tests if this geometry and the other passed into the method are crossing.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Crosses().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the geometry to compare to this geometry. |
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pure virtual |
Return a linestring from a curve geometry.
The returned geometry is a new instance whose ownership belongs to the caller.
If the dfMaxAngleStepSizeDegrees is zero, then a default value will be used. This is currently 4 degrees unless the user has overridden the value with the OGR_ARC_STEPSIZE configuration variable.
This method relates to the ISO SQL/MM Part 3 ICurve::CurveToLine() method.
This function is the same as C function OGR_G_CurveToLine().
dfMaxAngleStepSizeDegrees | the largest step in degrees along the arc, zero to use the default setting. |
papszOptions | options as a null-terminated list of strings or NULL. See OGRGeometryFactory::curveToLineString() for valid options. |
Implemented in OGRLineString, OGRCircularString, and OGRCompoundCurve.
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virtualinherited |
Return a Delaunay triangulation of the vertices of the geometry.
This function is the same as the C function OGR_G_DelaunayTriangulation().
This function is built on the GEOS library, v3.4 or above. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.
dfTolerance | optional snapping tolerance to use for improved robustness |
bOnlyEdges | if TRUE, will return a MULTILINESTRING, otherwise it will return a GEOMETRYCOLLECTION containing triangular POLYGONs. |
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virtualinherited |
Compute difference.
Generates a new geometry which is the region of this geometry with the region of the second geometry removed.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Difference().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the other geometry removed from "this" geometry. |
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virtualinherited |
Test for disjointness.
Tests if this geometry and the other passed into the method are disjoint.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Disjoint().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the geometry to compare to this geometry. |
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virtualinherited |
Compute distance between two geometries.
Returns the shortest distance between the two geometries. The distance is expressed into the same unit as the coordinates of the geometries.
This method is the same as the C function OGR_G_Distance().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the other geometry to compare against. |
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virtualinherited |
Returns the 3D distance between two geometries.
The distance is expressed into the same unit as the coordinates of the geometries.
This method is built on the SFCGAL library, check it for the definition of the geometry operation. If OGR is built without the SFCGAL library, this method will always return -1.0
This function is the same as the C function OGR_G_Distance3D().
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inherited |
Dump geometry in well known text format to indicated output file.
A few options can be defined to change the default dump :
pszPrefix | the prefix to put on each line of output. |
papszOptions | NULL terminated list of options (may be NULL) |
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inherited |
Dump geometry in well known text format to indicated output file.
A few options can be defined to change the default dump :
This method is the same as the C function OGR_G_DumpReadable().
fp | the text file to write the geometry to. |
pszPrefix | the prefix to put on each line of output. |
papszOptions | NULL terminated list of options (may be NULL) |
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pure virtualinherited |
Clear geometry information.
This restores the geometry to its 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().
Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
pure virtual |
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. |
Implemented in OGRSimpleCurve, and OGRCompoundCurve.
|
pure virtualinherited |
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().
Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
inherited |
Returns a GEOSGeom object corresponding to the geometry.
hGEOSCtxt | GEOS context |
bRemoveEmptyParts | Whether empty parts of the geometry should be removed before exporting to GEOS (GDAL >= 3.10) |
|
virtualinherited |
Convert a geometry into GML format.
The GML geometry is expressed directly in terms of GML basic data types assuming the this is available in the gml namespace. The returned string should be freed with CPLFree() when no longer required.
The supported options are :
This method is the same as the C function OGR_G_ExportToGMLEx().
papszOptions | NULL-terminated list of options. |
|
virtualinherited |
Convert a geometry into GeoJSON format.
The returned string should be freed with CPLFree() when no longer required.
The following options are supported :
This method is the same as the C function OGR_G_ExportToJson().
papszOptions | Null terminated list of options, or null (added in 3.9) |
|
virtualinherited |
|
inherited |
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. |
|
pure virtualinherited |
Convert a geometry into well known binary format.
This function relates to the SFCOM IWks::ExportToWKB() method.
This function is the same as the C function OGR_G_ExportToWkbEx().
pabyDstBuffer | a buffer into which the binary representation is written. This buffer must be at least OGR_G_WkbSize() byte in size. |
psOptions | WKB export options. |
Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
inherited |
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(). |
variant | the specification that must be conformed too :
|
|
pure virtualinherited |
Export a WKT geometry.
opts | Output options. |
err | Pointer to error code, if desired. |
Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRMultiPoint, OGRMultiCurve, OGRMultiLineString, OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.
|
pure virtualinherited |
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().
Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
staticinherited |
Destroy a GEOS context.
hGEOSCtxt | GEOS context |
|
inlinestaticinherited |
Convert a OGRGeometryH to a OGRGeometry*.
|
pure virtual |
Get the area of the (closed) curve.
This method is designed to be used by OGRCurvePolygon::get_Area().
Implemented in OGRLineString, OGRCircularString, and OGRCompoundCurve.
|
protectedpure virtual |
Get the area of the purely curve portions of a (closed) curve.
This method is designed to be used on a closed convex curve.
Implemented in OGRCompoundCurve.
|
pure virtual |
Get the area of the (closed) curve, considered as a surface on the underlying ellipsoid of the SRS attached to the geometry.
This method is designed to be used by OGRCurvePolygon::get_GeodesicArea().
The returned area will always be in square meters, and assumes that polygon edges describe geodesic lines on the ellipsoid.
Geodesics follow the shortest route on the surface of the ellipsoid.
If the geometry' SRS is not a geographic one, geometries are reprojected to the underlying geographic SRS of the geometry' SRS. OGRSpatialReference::GetDataAxisToSRSAxisMapping() is honored.
Note that geometries with circular arcs will be linearized in their original coordinate space first, so the resulting geodesic area will be an approximation.
poSRSOverride | If not null, overrides OGRGeometry::getSpatialReference() |
Implemented in OGRLineString, OGRCircularString, and OGRCompoundCurve.
|
pure virtual |
Get the length of the curve, considered as a geodesic line on the underlying ellipsoid of the SRS attached to the geometry.
The returned length will always be in meters.
Geodesics follow the shortest route on the surface of the ellipsoid.
If the geometry' SRS is not a geographic one, geometries are reprojected to the underlying geographic SRS of the geometry' SRS. OGRSpatialReference::GetDataAxisToSRSAxisMapping() is honored.
Note that geometries with circular arcs will be linearized in their original coordinate space first, so the resulting geodesic length will be an approximation.
poSRSOverride | If not null, overrides OGRGeometry::getSpatialReference() |
Implemented in OGRLineString, OGRCircularString, and OGRCompoundCurve.
|
virtual |
Return TRUE if curve is closed.
Tests if a curve is closed. A curve is closed if its start point is equal to its end point.
For equality tests, the M dimension is ignored.
This method relates to the SFCOM ICurve::get_IsClosed() method.
|
pure virtual |
Returns the length of the curve.
This method relates to the SFCOM ICurve::get_Length() method.
Implemented in OGRSimpleCurve, OGRCircularString, and OGRCompoundCurve.
|
virtualinherited |
Get the dimension of the coordinates in this object.
This method is the same as the C function OGR_G_GetCoordinateDimension().
|
virtualinherited |
Return curve version of this geometry.
Returns a geometry that has possibly CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE in it, by de-approximating curve geometries.
If the geometry has no curve portion, the returned geometry will be a clone of it.
The ownership of the returned geometry belongs to the caller.
The reverse method is OGRGeometry::getLinearGeometry().
This function is the same as C function OGR_G_GetCurveGeometry().
papszOptions | options as a null-terminated list of strings. Unused for now. Must be set to NULL. |
Reimplemented in OGRLineString, OGRPolygon, and OGRGeometryCollection.
|
overridevirtual |
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().
Implements OGRGeometry.
|
pure virtualinherited |
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. |
Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
pure virtualinherited |
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. |
Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
pure virtualinherited |
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().
Implemented in OGRPoint, OGRLineString, OGRLinearRing, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRTriangulatedSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.
|
pure virtualinherited |
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().
Implemented in OGRPoint, OGRLineString, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRTriangulatedSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.
|
inherited |
Get the geometry type that conforms with ISO SQL/MM Part3.
|
virtualinherited |
Return, possibly approximate, non-curve version of this geometry.
Returns a geometry that has no CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE in it, by approximating curve geometries.
The ownership of the returned geometry belongs to the caller.
The reverse method is OGRGeometry::getCurveGeometry().
This method is the same as the C function OGR_G_GetLinearGeometry().
dfMaxAngleStepSizeDegrees | the largest step in degrees along the arc, zero to use the default setting. |
papszOptions | options as a null-terminated list of strings. See OGRGeometryFactory::curveToLineString() for valid options. |
Reimplemented in OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, and OGRGeometryCollection.
|
pure virtual |
Return the number of points of a curve geometry.
This method, as a method of OGRCurve, does not relate to a standard. For circular strings or linestrings, it returns the number of points, conforming to SF COM NumPoints(). For compound curves, it returns the sum of the number of points of each of its components (non including intermediate starting/ending points of the different parts).
Implemented in OGRSimpleCurve, and OGRCompoundCurve.
|
pure 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().
Implemented in OGRSimpleCurve, and OGRCompoundCurve.
|
inlineinherited |
Returns spatial reference system for object.
This method relates to the SFCOM IGeometry::get_SpatialReference() method.
This method is the same as the C function OGR_G_GetSpatialReference().
|
virtualinherited |
Returns if this geometry is or has curve geometry.
Returns if a geometry is, contains or may contain a CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE.
If bLookForNonLinear is set to TRUE, it will be actually looked if the geometry or its subgeometries are or contain a non-linear geometry in them. In which case, if the method returns TRUE, it means that getLinearGeometry() would return an approximate version of the geometry. Otherwise, getLinearGeometry() would do a conversion, but with just converting container type, like COMPOUNDCURVE -> LINESTRING, MULTICURVE -> MULTILINESTRING or MULTISURFACE -> MULTIPOLYGON, resulting in a "loss-less" conversion.
This method is the same as the C function OGR_G_HasCurveGeometry().
bLookForNonLinear | set it to TRUE to check if the geometry is or contains a CIRCULARSTRING. |
Reimplemented in OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.
|
virtualinherited |
Returns whether a geometry has empty parts/rings.
Returns true if removeEmptyParts() will modify the geometry.
This is different from IsEmpty().
Reimplemented in OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
inherited |
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 |
|
pure virtualinherited |
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. |
Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiPolygon, OGRPolyhedralSurface, and OGRMultiLineString.
|
inlineinherited |
Deprecated.
|
pure virtualinherited |
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. |
Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRPolyhedralSurface, OGRMultiPoint, OGRMultiCurve, OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRPolyhedralSurface, OGRMultiPoint, and OGRMultiCurve.
|
virtualinherited |
Compute intersection.
Generates a new geometry which is the region of intersection of the two geometries operated on. The Intersects() method can be used to test if two geometries intersect.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Intersection().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the other geometry intersected with "this" geometry. |
|
virtualinherited |
Do these features intersect?
Determines whether two geometries intersect. If GEOS is enabled, then this is done in rigorous fashion otherwise TRUE is returned if the envelopes (bounding boxes) of the two geometries overlap.
The poOtherGeom argument may be safely NULL, but in this case the method will always return TRUE. That is, a NULL geometry is treated as being everywhere.
This method is the same as the C function OGR_G_Intersects().
poOtherGeom | the other geometry to test against. |
Reimplemented in OGRPoint, and OGRCurvePolygon.
|
protectedvirtual |
Returns if a point intersects a (closed) curve.
Final users should use OGRGeometry::Intersects() instead.
p | the point to test |
|
inlineinherited |
Returns whether the geometry has a Z component.
|
virtual |
Returns TRUE if the ring has clockwise winding (or less than 2 points)
Assumes that the line is closed.
Reimplemented in OGRLineString.
|
virtual |
Returns if a (closed) curve forms a convex shape.
|
pure virtualinherited |
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.
Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
inlineinherited |
Returns whether the geometry has a M component.
|
inherited |
Returns whether the geometry is a polygon with 4 corners forming a rectangle.
|
virtualinherited |
Test if the geometry is a ring.
This method is the same as the C function OGR_G_IsRing().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return FALSE.
|
virtualinherited |
Test if the geometry is simple.
This method is the same as the C function OGR_G_IsSimple().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return FALSE.
|
virtualinherited |
Test if the geometry is valid.
This method is the same as the C function OGR_G_IsValid().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return FALSE.
Reimplemented in OGRCircularString.
|
virtualinherited |
Attempts to make an invalid geometry valid without losing vertices.
Already-valid geometries are cloned without further intervention for default MODE=LINEWORK. Already-valid geometries with MODE=STRUCTURE may be subject to non-significant transformations, such as duplicated point removal, change in ring winding order, etc. (before GDAL 3.10, single-part geometry collections could be returned a single geometry. GDAL 3.10 returns the same type of geometry).
Running OGRGeometryFactory::removeLowerDimensionSubGeoms() as a post-processing step is often desired.
This method is the same as the C function OGR_G_MakeValid().
This function is built on the GEOS >= 3.8 library, check it for the definition of the geometry operation. If OGR is built without the GEOS >= 3.8 library, this function will return a clone of the input geometry if it is valid, or NULL if it is invalid
papszOptions | NULL terminated list of options, or NULL. The following options are available:
|
|
virtualinherited |
Attempts to bring geometry into normalized/canonical form.
This method is the same as the C function OGR_G_Normalize().
This function is built on the GEOS library; check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.
|
virtualinherited |
Test for overlap.
Tests if this geometry and the other passed into the method overlap, that is their intersection has a non-zero area.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Overlaps().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the geometry to compare to this geometry. |
|
virtualinherited |
Polygonizes a set of sparse edges.
A new geometry object is created and returned containing a collection of reassembled Polygons: NULL will be returned if the input collection doesn't corresponds to a MultiLinestring, or when reassembling Edges into Polygons is impossible due to topological inconsistencies.
This method is the same as the C function OGR_G_Polygonize().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
|
virtualinherited |
Remove empty parts/rings from this geometry.
Reimplemented in OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
pure virtual |
Reverse point order.
This method updates the points in this curve in place reversing the point ordering (first for last, etc) and component ordering for a compound curve.
Implemented in OGRSimpleCurve, and OGRCompoundCurve.
|
inherited |
Round coordinates of the geometry to the specified precision.
Note that this is not the same as OGRGeometry::SetPrecision(). The later will return valid geometries, whereas roundCoordinates() does not make such guarantee and may return geometries with invalidities, if they are not compatible of the specified precision. roundCoordinates() supports curve geometries, whereas SetPrecision() does not currently.
One use case for roundCoordinates() is to undo the effect of quantizeCoordinates().
sPrecision | Contains the precision requirements. |
|
inherited |
Round coordinates of a geometry, exploiting characteristics of the IEEE-754 double-precision binary representation.
Determines the number of bits (N) required to represent a coordinate value with a specified number of digits after the decimal point, and then sets all but the N most significant bits to zero. The resulting coordinate value will still round to the original value (e.g. after roundCoordinates()), but will have improved compressiblity.
options | Contains the precision requirements. |
|
virtualinherited |
Modify the geometry such it has no segment longer then the given distance.
This method modifies the geometry to add intermediate vertices if necessary so that the maximum length between 2 consecutive vertices is lower than dfMaxLength.
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 |
Reimplemented in OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, and OGRGeometryCollection.
|
virtualinherited |
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 in OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
virtualinherited |
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 in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
virtualinherited |
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 in OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
inherited |
Set the geometry's precision, rounding all its coordinates to the precision grid, and making sure the geometry is still valid.
This is a stronger version of roundCoordinates().
Note that at time of writing GEOS does no supported curve geometries. So currently if this function is called on such a geometry, OGR will first call getLinearGeometry() on the input and getCurveGeometry() on the output, but that it is unlikely to yield to the expected result.
This function is the same as the C function OGR_G_SetPrecision().
This function is built on the GEOSGeom_setPrecision_r() function of the GEOS library. Check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.
dfGridSize | size of the precision grid, or 0 for FLOATING precision. |
nFlags | The bitwise OR of zero, one or several of OGR_GEOS_PREC_NO_TOPO and OGR_GEOS_PREC_KEEP_COLLAPSED |
|
virtualinherited |
Simplify the geometry.
This function is the same as the C function OGR_G_Simplify().
This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.
dTolerance | the distance tolerance for the simplification. |
|
inherited |
Simplify the geometry while preserving topology.
This function is the same as the C function OGR_G_SimplifyPreserveTopology().
This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.
dTolerance | the distance tolerance for the simplification. |
|
pure virtual |
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. |
Implemented in OGRSimpleCurve, and OGRCompoundCurve.
|
virtualinherited |
Swap x and y coordinates.
Reimplemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.
|
virtualinherited |
Compute symmetric difference.
Generates a new geometry which is the symmetric difference of this geometry and the second geometry passed into the method.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_SymDifference().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the other geometry. |
|
inlineinherited |
Down-cast to OGRCircularString*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbCircularString.
|
inlineinherited |
Down-cast to OGRCircularString*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbCircularString.
|
inlineinherited |
Down-cast to OGRCompoundCurve*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbCompoundCurve.
|
inlineinherited |
Down-cast to OGRCompoundCurve*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbCompoundCurve.
|
inlineinherited |
Down-cast to OGRCurve*.
Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbCurve).
|
inlineinherited |
Down-cast to OGRCurve*.
Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbCurve).
|
inlineinherited |
Down-cast to OGRCurvePolygon*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbCurvePolygon or wkbPolygon or wkbTriangle.
|
inlineinherited |
Down-cast to OGRCurvePolygon*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbCurvePolygon or wkbPolygon or wkbTriangle.
|
inlineinherited |
Down-cast to OGRGeometryCollection*.
Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbGeometryCollection).
|
inlineinherited |
Down-cast to OGRGeometryCollection*.
Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbGeometryCollection).
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inlinestaticinherited |
Convert a OGRGeometry* to a OGRGeometryH.
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inlineinherited |
Down-cast to OGRLinearRing*.
Implies prior checking that EQUAL(getGeometryName(), "LINEARRING").
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inlineinherited |
Down-cast to OGRLinearRing*.
Implies prior checking that EQUAL(getGeometryName(), "LINEARRING").
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inlineinherited |
Down-cast to OGRLineString*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbLineString.
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inlineinherited |
Down-cast to OGRLineString*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbLineString.
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inlineinherited |
Down-cast to OGRMultiCurve*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiCurve and derived types.
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inlineinherited |
Down-cast to OGRMultiCurve*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiCurve and derived types.
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inlineinherited |
Down-cast to OGRMultiLineString*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiLineString.
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inlineinherited |
Down-cast to OGRMultiLineString*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiLineString.
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inlineinherited |
Down-cast to OGRMultiPoint*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPoint.
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inlineinherited |
Down-cast to OGRMultiPoint*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPoint.
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inlineinherited |
Down-cast to OGRMultiPolygon*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPolygon.
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inlineinherited |
Down-cast to OGRMultiPolygon*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPolygon.
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inlineinherited |
Down-cast to OGRMultiSurface*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiSurface and derived types.
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inlineinherited |
Down-cast to OGRMultiSurface*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiSurface and derived types.
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inlineinherited |
Down-cast to OGRPoint*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbPoint.
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inlineinherited |
Down-cast to OGRPoint*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbPoint.
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inlineinherited |
Down-cast to OGRPolygon*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolygon or wkbTriangle.
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inlineinherited |
Down-cast to OGRPolygon*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolygon or wkbTriangle.
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inlineinherited |
Down-cast to OGRPolyhedralSurface*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolyhedralSurface or wkbTIN.
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inlineinherited |
Down-cast to OGRPolyhedralSurface*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolyhedralSurface or wkbTIN.
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inline |
Down-cast to OGRSimpleCurve*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbLineString or wkbCircularString.
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inline |
Down-cast to OGRSimpleCurve*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbLineString or wkbCircularString.
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inlineinherited |
Down-cast to OGRSurface*.
Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbSurface).
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inlineinherited |
Down-cast to OGRSurface*.
Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbSurface).
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inlineinherited |
Down-cast to OGRTriangle*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbTriangle.
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inlineinherited |
Down-cast to OGRTriangle*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbTriangle.
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inlineinherited |
Down-cast to OGRTriangulatedSurface*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbTIN.
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inlineinherited |
Down-cast to OGRTriangulatedSurface*.
Implies prior checking that wkbFlatten(getGeometryType()) == wkbTIN.
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virtualinherited |
Test for touching.
Tests if this geometry and the other passed into the method are touching.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Touches().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the geometry to compare to this geometry. |
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pure virtualinherited |
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 only does reprojection on a point-by-point basis. It does not include advanced logic to deal with discontinuities at poles or antimeridian. For that, use the OGRGeometryFactory::transformWithOptions() method.
This method is the same as the C function OGR_G_Transform().
poCT | the transformation to apply. |
Implemented in OGRPolyhedralSurface, OGRPoint, OGRSimpleCurve, OGRLinearRing, OGRCompoundCurve, OGRCurvePolygon, and OGRGeometryCollection.
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inherited |
Transform geometry to new spatial reference system.
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.
This method will only work if the geometry already has an assigned spatial reference system, and if it is transformable to the target coordinate system.
Because this method requires internal creation and initialization of an OGRCoordinateTransformation object it is significantly more expensive to use this method to transform many geometries than it is to create the OGRCoordinateTransformation in advance, and call transform() with that transformation. This method exists primarily for convenience when only transforming a single geometry.
This method is the same as the C function OGR_G_TransformTo().
poSR | spatial reference system to transform to. |
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inherited |
Returns the union of all components of a single geometry.
Usually used to convert a collection into the smallest set of polygons that cover the same area.
See https://postgis.net/docs/ST_UnaryUnion.html for more details.
This method is the same as the C function OGR_G_UnaryUnion().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
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virtualinherited |
Compute union.
Generates a new geometry which is the region of union of the two geometries operated on.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Union().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the other geometry unioned with "this" geometry. |
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virtualinherited |
Compute union using cascading.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
The input geometry must be a MultiPolygon.
This method is the same as the C function OGR_G_UnionCascaded().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
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pure 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().
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. |
Implemented in OGRSimpleCurve, OGRCircularString, and OGRCompoundCurve.
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virtualinherited |
Test for containment.
Tests if actual geometry object is within the passed geometry.
Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.
This method is the same as the C function OGR_G_Within().
This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.
poOtherGeom | the geometry to compare to this geometry. |
Reimplemented in OGRPoint.
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pure virtualinherited |
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().
Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, and OGRPolyhedralSurface.