#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 |
void | assignSpatialReference (OGRSpatialReference *poSR) |
OGRSpatialReference * | getSpatialReference (void) const |
virtual OGRErr | transform (OGRCoordinateTransformation *poCT)=0 |
OGRErr | transformTo (OGRSpatialReference *poSR) |
virtual OGRBoolean | Intersect (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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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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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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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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Do these features intersect? Currently this is not implemented in a rigerous fashion, and generally just tests whether the envelopes of the two features intersect. Eventually this will be made rigerous. The poOtherGeom argument may be safely NULL, but in this case the method will always return FALSE. This method is the same as the C function OGR_G_Intersect().
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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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