#include <ogr_geometry.h>
Inheritance diagram for OGRGeometry:
Public Member Functions | |
virtual void | empty ()=0 |
virtual OGRErr | importFromWkb (unsigned char *, int=-1)=0 |
virtual OGRErr | importFromWkt (char **ppszInput)=0 |
virtual void | dumpReadable (FILE *, const char *=NULL) |
virtual void | flattenTo2D ()=0 |
virtual char * | exportToGML () const |
virtual void | closeRings () |
void | assignSpatialReference (OGRSpatialReference *poSR) |
OGRSpatialReference * | getSpatialReference (void) const |
virtual OGRErr | transform (OGRCoordinateTransformation *poCT)=0 |
OGRErr | transformTo (OGRSpatialReference *poSR) |
virtual OGRBoolean | Intersects (OGRGeometry *) const |
virtual OGRBoolean | Equals (OGRGeometry *) const =0 |
virtual OGRBoolean | Disjoint (const OGRGeometry *) const |
virtual OGRBoolean | Touches (const OGRGeometry *) const |
virtual OGRBoolean | Crosses (const OGRGeometry *) const |
virtual OGRBoolean | Within (const OGRGeometry *) const |
virtual OGRBoolean | Contains (const OGRGeometry *) const |
virtual OGRBoolean | Overlaps (const OGRGeometry *) const |
virtual OGRGeometry * | getBoundary () const |
virtual double | Distance (const OGRGeometry *) const |
virtual OGRGeometry * | ConvexHull () const |
virtual OGRGeometry * | Buffer (double dfDist, int nQuadSegs=30) const |
virtual OGRGeometry * | Intersection (const OGRGeometry *) const |
virtual OGRGeometry * | Union (const OGRGeometry *) const |
virtual OGRGeometry * | Difference (const OGRGeometry *) const |
virtual OGRGeometry * | SymmetricDifference (const OGRGeometry *) const |
Note that the family of spatial analysis methods (Equal(), Disjoint(), ..., ConvexHull(), Buffer(), ...) are not implemented at ths time. Some other required and optional geometry methods have also been omitted at this time.
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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. This is similar to the SFCOM IGeometry::put_SpatialReference() method. This method is the same as the C function OGR_G_AssignSpatialReference().
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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 segements 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.
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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 in OGRLinearRing, OGRPolygon, and OGRGeometryCollection. |
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Test for containment. Tests if the passed in geometry contains the target geometry. 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.
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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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Test for crossing. Tests if this geometry and the other passed into the method are crossing. 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.
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Compute difference. Generates a new geometry which is the region of this geometry with the region of the second geometry removed. 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.
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Test for disjointness. Tests if this geometry and the other passed into the method are disjoint. 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.
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Compute distance between two geometries. Returns the shortest distance between the two 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.
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Dump geometry in well known text format to indicated output file. This method is the same as the C function OGR_G_DumpReadable().
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Clear geometry information. This restores the geometry to it's initial state after construction, and before assignment of actual geometry. This method relates to the SFCOM IGeometry::Empty() method. This method is the same as the C function OGR_G_Empty(). Implemented in OGRPoint, OGRLineString, OGRPolygon, and OGRGeometryCollection. |
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Returns two if two geometries are equivalent. This method is the same as the C function OGR_G_Equal().
Implemented in OGRPoint, OGRLineString, OGRPolygon, and OGRGeometryCollection. |
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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. This method is the same as the C function OGR_G_ExportToGML().
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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, OGRLineString, OGRPolygon, and OGRGeometryCollection. |
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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_GetBoundary(). 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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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().
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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().
Implemented in OGRPoint, OGRLineString, OGRLinearRing, OGRPolygon, and OGRGeometryCollection. |
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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().
Implemented in OGRPoint, OGRLineString, OGRPolygon, OGRGeometryCollection, OGRMultiPolygon, OGRMultiPoint, and OGRMultiLineString. |
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Compute intersection. Generates a new geometry which is the region of intersection of the two geometries operated on. The Intersect() method can be used to test if two geometries intersect. 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.
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Do these features intersect? Determines whether two geometries intersect. If GEOS is enabled, then this is done in rigerous fashion otherwise TRUE is returned if the envelopes (bounding boxes) of the two features 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().
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Test for overlap. Tests if this geometry and the other passed into the method overlap, that is their intersection has a non-zero area. 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.
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Compute symmetric difference. Generates a new geometry which is the symmetric difference of this geometry and the second geometry passed into the method. This method is the same as the C function OGR_G_SymmetricDifference(). 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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Test for touching. Tests if this geometry and the other passed into the method are touching. 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.
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Apply arbitrary coordinate transformation to geometry. This method will transform the coordinates of a geometry from their current spatial reference system to a new target spatial reference system. Normally this means reprojecting the vectors, but it could include datum shifts, and changes of units. Note that this method does not require that the geometry already have a spatial reference system. It will be assumed that they can be treated as having the source spatial reference system of the OGRCoordinateTransformation object, and the actual SRS of the geometry will be ignored. On successful completion the output OGRSpatialReference of the OGRCoordinateTransformation will be assigned to the geometry. This method is the same as the C function OGR_G_Transform().
Implemented in OGRPoint, OGRLineString, OGRPolygon, and OGRGeometryCollection. |
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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().
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Compute union. Generates a new geometry which is the region of union of the two geometries operated on. 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.
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Test for containment. Tests if the passed in geometry is within the target geometry. 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.
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