OGR
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#include <ogr_geometry.h>
Public Member Functions | |
virtual double | get_Length () const =0 |
Returns the length of the curve. More... | |
virtual void | StartPoint (OGRPoint *) const =0 |
Return the curve start point. More... | |
virtual void | EndPoint (OGRPoint *) const =0 |
Return the curve end point. More... | |
virtual int | get_IsClosed () const |
Return TRUE if curve is closed. More... | |
virtual void | Value (double, OGRPoint *) const =0 |
Fetch point at given distance along curve. More... | |
virtual OGRLineString * | CurveToLine (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=NULL) const =0 |
Return a linestring from a curve geometry. More... | |
virtual int | getDimension () const |
Get the dimension of this object. More... | |
virtual int | getNumPoints () const =0 |
Return the number of points of a curve geometry. More... | |
virtual OGRPointIterator * | getPointIterator () const =0 |
Returns a point iterator over the curve. 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... | |
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virtual int | getCoordinateDimension () const |
Get the dimension of the coordinates in this object. More... | |
virtual OGRBoolean | IsEmpty () const =0 |
Returns TRUE (non-zero) if the object has no points. 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 | empty ()=0 |
Clear geometry information. This restores the geometry to it's initial state after construction, and before assignment of actual geometry. More... | |
virtual OGRGeometry * | clone () const =0 |
Make a copy of this object. More... | |
virtual void | getEnvelope (OGREnvelope *psEnvelope) const =0 |
Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure. More... | |
virtual void | getEnvelope (OGREnvelope3D *psEnvelope) const =0 |
Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure. More... | |
virtual int | WkbSize () const =0 |
Returns size of related binary representation. More... | |
virtual OGRErr | importFromWkb (unsigned char *, int=-1, OGRwkbVariant=wkbVariantOldOgc)=0 |
Assign geometry from well known binary data. More... | |
virtual OGRErr | exportToWkb (OGRwkbByteOrder, unsigned char *, OGRwkbVariant=wkbVariantOldOgc) const =0 |
Convert a geometry into well known binary format. More... | |
virtual OGRErr | importFromWkt (char **ppszInput)=0 |
Assign geometry from well known text data. More... | |
virtual OGRErr | exportToWkt (char **ppszDstText, OGRwkbVariant=wkbVariantOldOgc) const =0 |
Convert a geometry into well known text format. 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 void | flattenTo2D ()=0 |
Convert geometry to strictly 2D. In a sense this converts all Z coordinates to 0.0. 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 OGRBoolean | hasCurveGeometry (int bLookForNonLinear=FALSE) const |
Returns if this geometry is or has curve geometry. More... | |
virtual OGRGeometry * | getCurveGeometry (const char *const *papszOptions=NULL) const |
Return curve version of this geometry. More... | |
virtual OGRGeometry * | getLinearGeometry (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=NULL) const |
Return, possibly approximate, non-curve version of this geometry. More... | |
virtual void | closeRings () |
Force rings to be closed. More... | |
virtual void | setCoordinateDimension (int nDimension) |
Set the coordinate dimension. More... | |
void | assignSpatialReference (OGRSpatialReference *poSR) |
Assign spatial reference to this object. More... | |
OGRSpatialReference * | getSpatialReference (void) const |
Returns spatial reference system for object. More... | |
virtual OGRErr | transform (OGRCoordinateTransformation *poCT)=0 |
Apply arbitrary coordinate transformation to geometry. More... | |
OGRErr | transformTo (OGRSpatialReference *poSR) |
Transform geometry to new spatial reference system. More... | |
virtual void | segmentize (double dfMaxLength) |
Modify the geometry such it has no segment longer then the given distance. More... | |
virtual OGRBoolean | Intersects (const OGRGeometry *) const |
Do these features intersect? More... | |
virtual OGRBoolean | Equals (OGRGeometry *) const =0 |
Returns TRUE if two geometries are equivalent. 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... | |
virtual void | swapXY () |
Swap x and y coordinates. More... | |
Static Public Member Functions | |
static OGRCompoundCurve * | CastToCompoundCurve (OGRCurve *puCurve) |
Cast to compound curve. More... | |
static OGRLineString * | CastToLineString (OGRCurve *poCurve) |
Cast to linestring. More... | |
static OGRLinearRing * | CastToLinearRing (OGRCurve *poCurve) |
Cast to linear ring. More... | |
Protected Member Functions | |
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... | |
Friends | |
class | OGRCurvePolygon |
class | OGRCompoundCurve |
Abstract curve base class for OGRLineString, OGRCircularString and OGRCompoundCurve
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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. |
References OGRCompoundCurve::addCurveDirectly(), OGRGeometry::assignSpatialReference(), CastToLineString(), OGRGeometry::getGeometryType(), OGRGeometry::getSpatialReference(), OGRGeometry::IsEmpty(), and wkbLineString.
Referenced by OGRGeometryFactory::forceTo().
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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. |
Referenced by OGRCompoundCurve::CastToLinearRing(), OGRCurvePolygon::CastToPolygon(), OGRCurvePolygon::CurvePolyToPoly(), and OGRGeometryFactory::forceToPolygon().
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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. |
Referenced by CastToCompoundCurve(), OGRCompoundCurve::CastToLinearRing(), OGRMultiCurve::CastToMultiLineString(), OGRGeometryFactory::forceTo(), OGRGeometryFactory::forceToLineString(), and OGRCompoundCurve::getPointIterator().
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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 |
Reimplemented in OGRCircularString.
Referenced by OGRCurvePolygon::swapXY().
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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 OGRCompoundCurve, OGRCircularString, and OGRLineString.
Referenced by OGRCurvePolygon::CurvePolyToPoly(), and OGRCompoundCurve::Value().
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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 OGRCompoundCurve, and OGRSimpleCurve.
Referenced by OGRCompoundCurve::addCurveDirectly(), OGRCompoundCurve::EndPoint(), and get_IsClosed().
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pure virtual |
Get the area of the (closed) curve.
This method is designed to be used by OGRCurvePolygon::get_Area().
Implemented in OGRCompoundCurve, OGRCircularString, and OGRLineString.
Referenced by OGRCurvePolygon::get_Area().
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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, OGRCircularString, and OGRLineString.
Referenced by OGRCompoundCurve::get_AreaOfCurveSegments().
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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.
This method relates to the SFCOM ICurve::get_IsClosed() method.
References EndPoint(), OGRPoint::getX(), OGRPoint::getY(), and StartPoint().
Referenced by OGRCurvePolygon::addRing(), OGRLineString::CastToLinearRing(), OGRGeometryFactory::forceTo(), OGRCircularString::get_Area(), OGRCompoundCurve::get_Area(), and OGRCircularString::getLinearGeometry().
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pure virtual |
Returns the length of the curve.
This method relates to the SFCOM ICurve::get_Length() method.
Implemented in OGRCompoundCurve, OGRCircularString, and OGRSimpleCurve.
Referenced by OGRCompoundCurve::get_Length(), and OGRCompoundCurve::Value().
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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.
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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 OGRCompoundCurve, and OGRSimpleCurve.
Referenced by OGRCompoundCurve::addCurveDirectly(), OGRCurvePolygon::addRing(), OGRGeometry::dumpReadable(), OGRGeometryFactory::forceTo(), and OGRCompoundCurve::getNumPoints().
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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 OGRCompoundCurve, and OGRSimpleCurve.
Referenced by IsConvex().
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Returns if a (closed) curve forms a convex shape.
References OGRPointIterator::getNextPoint(), getPointIterator(), OGRPoint::getX(), OGRPoint::getY(), OGRPoint::setX(), and OGRPoint::setY().
Referenced by OGRCircularString::get_Area(), and OGRCompoundCurve::get_Area().
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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 OGRCompoundCurve, and OGRSimpleCurve.
Referenced by OGRCompoundCurve::addCurveDirectly(), get_IsClosed(), and OGRCompoundCurve::StartPoint().
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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 OGRCompoundCurve, OGRCircularString, and OGRSimpleCurve.
Referenced by OGRCompoundCurve::Value().