Quantum GIS API Documentation
1.7.4
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A geometry is the spatial representation of a feature. More...
#include <qgsgeometry.h>
Classes | |
class | Error |
Public Member Functions | |
QgsGeometry () | |
Constructor. | |
QgsGeometry (QgsGeometry const &) | |
copy constructor will prompt a deep copy of the object | |
QgsGeometry & | operator= (QgsGeometry const &rhs) |
assignments will prompt a deep copy of the object | |
~QgsGeometry () | |
Destructor. | |
void | fromGeos (GEOSGeometry *geos) |
Set the geometry, feeding in a geometry in GEOS format. | |
void | fromWkb (unsigned char *wkb, size_t length) |
Set the geometry, feeding in the buffer containing OGC Well-Known Binary and the buffer's length. | |
unsigned char * | asWkb () |
Returns the buffer containing this geometry in WKB format. | |
size_t | wkbSize () |
Returns the size of the WKB in asWkb(). | |
GEOSGeometry * | asGeos () |
Returns a geos geomtry. | |
QGis::WkbType | wkbType () |
Returns type of wkb (point / linestring / polygon etc.) | |
QGis::GeometryType | type () |
Returns type of the vector. | |
bool | isMultipart () |
Returns true if wkb of the geometry is of WKBMulti* type. | |
bool | isGeosEqual (QgsGeometry &) |
compare geometries using GEOS | |
bool | isGeosValid () |
check validity using GEOS | |
bool | isGeosEmpty () |
check if geometry is empty using GEOS | |
double | area () |
get area of geometry using GEOS | |
double | length () |
get length of geometry using GEOS | |
double | distance (QgsGeometry &geom) |
QgsPoint | closestVertex (const QgsPoint &point, int &atVertex, int &beforeVertex, int &afterVertex, double &sqrDist) |
Returns the vertex closest to the given point, the corresponding vertex index, squared distance snap point / target point and the indices of the vertices before/after. | |
void | adjacentVertices (int atVertex, int &beforeVertex, int &afterVertex) |
Returns the indexes of the vertices before and after the given vertex index. | |
bool | insertVertex (double x, double y, int beforeVertex) |
Insert a new vertex before the given vertex index, ring and item (first number is index 0) If the requested vertex number (beforeVertex.back()) is greater than the last actual vertex on the requested ring and item, it is assumed that the vertex is to be appended instead of inserted. | |
bool | moveVertex (double x, double y, int atVertex) |
Moves the vertex at the given position number and item (first number is index 0) to the given coordinates. | |
bool | deleteVertex (int atVertex) |
Deletes the vertex at the given position number and item (first number is index 0) Returns false if atVertex does not correspond to a valid vertex on this geometry (including if this geometry is a Point), or if the number of remaining verticies in the linestring would be less than two. | |
QgsPoint | vertexAt (int atVertex) |
Returns coordinates of a vertex. | |
double | sqrDistToVertexAt (QgsPoint &point, int atVertex) |
Returns the squared cartesian distance between the given point to the given vertex index (vertex at the given position number, ring and item (first number is index 0)) | |
double | closestVertexWithContext (const QgsPoint &point, int &atVertex) |
Searches for the the closest vertex in this geometry to the given point. | |
double | closestSegmentWithContext (const QgsPoint &point, QgsPoint &minDistPoint, int &beforeVertex) |
Searches for the closest segment of geometry to the given point. | |
int | addRing (const QList< QgsPoint > &ring) |
Adds a new ring to this geometry. | |
int | addIsland (const QList< QgsPoint > &ring) |
Adds a new island polygon to a multipolygon feature. | |
int | translate (double dx, double dy) |
Translate this geometry by dx, dy. | |
int | transform (const QgsCoordinateTransform &ct) |
Transform this geometry as described by CoordinateTranasform ct. | |
int | splitGeometry (const QList< QgsPoint > &splitLine, QList< QgsGeometry * > &newGeometries, bool topological, QList< QgsPoint > &topologyTestPoints) |
Splits this geometry according to a given line. | |
int | reshapeGeometry (const QList< QgsPoint > &reshapeWithLine) |
Replaces a part of this geometry with another line. | |
int | makeDifference (QgsGeometry *other) |
Changes this geometry such that it does not intersect the other geometry. | |
QgsRectangle | boundingBox () |
Returns the bounding box of this feature. | |
bool | intersects (const QgsRectangle &r) |
Test for intersection with a rectangle (uses GEOS) | |
bool | intersects (QgsGeometry *geometry) |
Test for intersection with a geometry (uses GEOS) | |
bool | contains (QgsPoint *p) |
Test for containment of a point (uses GEOS) | |
bool | contains (QgsGeometry *geometry) |
Test for if geometry is contained in an other (uses GEOS) | |
bool | disjoint (QgsGeometry *geometry) |
Test for if geometry is disjoint of an other (uses GEOS) | |
bool | equals (QgsGeometry *geometry) |
Test for if geometry equals an other (uses GEOS) | |
bool | touches (QgsGeometry *geometry) |
Test for if geometry touch an other (uses GEOS) | |
bool | overlaps (QgsGeometry *geometry) |
Test for if geometry overlaps an other (uses GEOS) | |
bool | within (QgsGeometry *geometry) |
Test for if geometry is within an other (uses GEOS) | |
bool | crosses (QgsGeometry *geometry) |
Test for if geometry crosses an other (uses GEOS) | |
QgsGeometry * | buffer (double distance, int segments) |
Returns a buffer region around this geometry having the given width and with a specified number of segments used to approximate curves. | |
QgsGeometry * | simplify (double tolerance) |
Returns a simplified version of this geometry using a specified tolerance value. | |
QgsGeometry * | centroid () |
Returns the center of mass of a geometry. | |
QgsGeometry * | convexHull () |
Returns the smallest convex polygon that contains all the points in the geometry. | |
QgsGeometry * | intersection (QgsGeometry *geometry) |
Returns a geometry representing the points shared by this geometry and other. | |
QgsGeometry * | combine (QgsGeometry *geometry) |
Returns a geometry representing all the points in this geometry and other (a union geometry operation). | |
QgsGeometry * | difference (QgsGeometry *geometry) |
Returns a geometry representing the points making up this geometry that do not make up other. | |
QgsGeometry * | symDifference (QgsGeometry *geometry) |
Returns a Geometry representing the points making up this Geometry that do not make up other. | |
QString | exportToWkt () |
Exports the geometry to mWkt. | |
QgsPoint | asPoint () |
return contents of the geometry as a point if wkbType is WKBPoint, otherwise returns [0,0] | |
QgsPolyline | asPolyline () |
return contents of the geometry as a polyline if wkbType is WKBLineString, otherwise an empty list | |
QgsPolygon | asPolygon () |
return contents of the geometry as a polygon if wkbType is WKBPolygon, otherwise an empty list | |
QgsMultiPoint | asMultiPoint () |
return contents of the geometry as a multi point if wkbType is WKBMultiPoint, otherwise an empty list | |
QgsMultiPolyline | asMultiPolyline () |
return contents of the geometry as a multi linestring if wkbType is WKBMultiLineString, otherwise an empty list | |
QgsMultiPolygon | asMultiPolygon () |
return contents of the geometry as a multi polygon if wkbType is WKBMultiPolygon, otherwise an empty list | |
QList< QgsGeometry * > | asGeometryCollection () |
return contents of the geometry as a list of geometries | |
bool | deleteRing (int ringNum, int partNum=0) |
delete a ring in polygon or multipolygon. | |
bool | deletePart (int partNum) |
delete part identified by the part number | |
bool | convertToMultiType () |
Converts single type geometry into multitype geometry e.g. | |
int | avoidIntersections () |
Modifies geometry to avoid intersections with the layers specified in project properties. | |
void | validateGeometry (QList< Error > &errors) |
Validate geometry and produce a list of geometry errors. | |
Static Public Member Functions | |
static QgsGeometry * | fromWkt (QString wkt) |
static method that creates geometry from Wkt | |
static QgsGeometry * | fromPoint (const QgsPoint &point) |
construct geometry from a point | |
static QgsGeometry * | fromMultiPoint (const QgsMultiPoint &multipoint) |
construct geometry from a multipoint | |
static QgsGeometry * | fromPolyline (const QgsPolyline &polyline) |
construct geometry from a polyline | |
static QgsGeometry * | fromMultiPolyline (const QgsMultiPolyline &multiline) |
construct geometry from a multipolyline | |
static QgsGeometry * | fromPolygon (const QgsPolygon &polygon) |
construct geometry from a polygon | |
static QgsGeometry * | fromMultiPolygon (const QgsMultiPolygon &multipoly) |
construct geometry from a multipolygon | |
static QgsGeometry * | fromRect (const QgsRectangle &rect) |
construct geometry from a rectangle | |
static void | validatePolyline (QList< Error > &errors, int i, QgsPolyline polyline, bool ring=false) |
static void | validatePolygon (QList< Error > &errors, int i, const QgsPolygon &polygon) |
Private Member Functions | |
bool | exportWkbToGeos () |
Converts from the WKB geometry to the GEOS geometry. | |
bool | exportGeosToWkb () |
Converts from the GEOS geometry to the WKB geometry. | |
bool | insertVertex (double x, double y, int beforeVertex, const GEOSCoordSequence *old_sequence, GEOSCoordSequence **new_sequence) |
Insert a new vertex before the given vertex index (first number is index 0) in the given GEOS Coordinate Sequence. | |
void | translateVertex (int &wkbPosition, double dx, double dy, bool hasZValue) |
Translates a single vertex by dx and dy. | |
void | transformVertex (int &wkbPosition, const QgsCoordinateTransform &ct, bool hasZValue) |
Transforms a single vertex by ct. | |
int | splitLinearGeometry (GEOSGeometry *splitLine, QList< QgsGeometry * > &newGeometries) |
Splits line/multiline geometries. | |
int | splitPolygonGeometry (GEOSGeometry *splitLine, QList< QgsGeometry * > &newGeometries) |
Splits polygon/multipolygon geometries. | |
int | topologicalTestPointsSplit (const GEOSGeometry *splitLine, QList< QgsPoint > &testPoints) const |
Finds out the points that need to be tested for topological correctnes if this geometry will be split. | |
int | numberOfGeometries (GEOSGeometry *g) const |
Returns number of single geometry in a geos geometry. | |
int | mergeGeometriesMultiTypeSplit (QVector< GEOSGeometry * > &splitResult) |
QgsPoint | asPoint (unsigned char *&ptr, bool hasZValue) |
return point from wkb | |
QgsPolyline | asPolyline (unsigned char *&ptr, bool hasZValue) |
return polyline from wkb | |
QgsPolygon | asPolygon (unsigned char *&ptr, bool hasZValue) |
return polygon from wkb | |
Static Private Member Functions | |
static GEOSGeometry * | reshapeLine (const GEOSGeometry *origLine, const GEOSGeometry *reshapeLineGeos) |
Creates a new line from an original line and a reshape line. | |
static GEOSGeometry * | reshapePolygon (const GEOSGeometry *polygon, const GEOSGeometry *reshapeLineGeos) |
Creates a new polygon replacing the part from the first to the second intersection with the reshape line. | |
static GEOSGeometry * | nodeGeometries (const GEOSGeometry *splitLine, const GEOSGeometry *poly) |
Nodes together a split line and a (multi-) polygon geometry in a multilinestring. | |
static int | lineContainedInLine (const GEOSGeometry *line1, const GEOSGeometry *line2) |
Tests if line1 is completely contained in line2. | |
static int | pointContainedInLine (const GEOSGeometry *point, const GEOSGeometry *line) |
Tests if a point is on a line. | |
static bool | geomInDegrees (const GEOSGeometry *geom) |
Tests if geom bounding rect is within -180 <= x <= 180, -90 <= y <= 90. | |
static void | checkRingIntersections (QList< Error > &errors, int p0, int i0, const QgsPolyline &ring0, int p1, int i1, const QgsPolyline &ring1) |
static bool | geosRelOp (char(*op)(const GEOSGeometry *, const GEOSGeometry *), QgsGeometry *a, QgsGeometry *b) |
Private Attributes | |
unsigned char * | mGeometry |
pointer to geometry in binary WKB format This is the class' native implementation | |
size_t | mGeometrySize |
size of geometry | |
GEOSGeometry * | mGeos |
cached GEOS version of this geometry | |
bool | mDirtyWkb |
If the geometry has been set since the last conversion to WKB. | |
bool | mDirtyGeos |
If the geometry has been set since the last conversion to GEOS. | |
Static Private Attributes | |
static int | refcount |
A geometry is the spatial representation of a feature.
Represents a geometry with input and output in formats specified by (at least) the Open Geospatial Consortium (WKB / Wkt), and containing various functions for geoprocessing of the geometry.
The geometry is represented internally by the OGC WKB format or as GEOS geometry. Some functions use WKB for their work, others use GEOS.
TODO: migrate completely to GEOS and only support WKB/Wkt import/export.
Definition at line 67 of file qgsgeometry.h.
Constructor.
Definition at line 182 of file qgsgeometry.cpp.
Referenced by asGeometryCollection(), and combine().
QgsGeometry::QgsGeometry | ( | QgsGeometry const & | rhs | ) |
copy constructor will prompt a deep copy of the object
Definition at line 191 of file qgsgeometry.cpp.
References mGeometry, mGeometrySize, and mGeos.
int QgsGeometry::addIsland | ( | const QList< QgsPoint > & | ring | ) |
Adds a new island polygon to a multipolygon feature.
Definition at line 2817 of file qgsgeometry.cpp.
References convertToMultiType(), createGeosCollection(), createGeosLinearRing(), createGeosPolygon(), exportWkbToGeos(), mDirtyGeos, mDirtyWkb, mGeos, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsVectorLayer::addIsland().
int QgsGeometry::addRing | ( | const QList< QgsPoint > & | ring | ) |
Adds a new ring to this geometry.
This makes only sense for polygon and multipolygons.
Definition at line 2628 of file qgsgeometry.cpp.
References createGeosCollection(), createGeosLinearRing(), createGeosPolygon(), exportWkbToGeos(), mDirtyGeos, mDirtyWkb, mGeos, QGis::Polygon, throwGEOSException(), type(), QGis::WKBMultiPolygon, QGis::WKBPolygon, and wkbType().
Referenced by QgsVectorLayer::addRing().
void QgsGeometry::adjacentVertices | ( | int | atVertex, |
int & | beforeVertex, | ||
int & | afterVertex | ||
) |
Returns the indexes of the vertices before and after the given vertex index.
This function takes into account the following factors:
1. If the given vertex index is at the end of a linestring, the adjacent index will be -1 (for "no adjacent vertex") 2. If the given vertex index is at the end of a linear ring (such as in a polygon), the adjacent index will take into account the first vertex is equal to the last vertex (and will skip equal vertex positions).
Definition at line 970 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyWkb, mGeometry, QgsDebugMsg, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
double QgsGeometry::area | ( | ) |
get area of geometry using GEOS
Definition at line 5893 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), and mGeos.
Referenced by QgsPalLayerSettings::checkMinimumSizeMM(), and QgsZonalStatistics::statisticsFromPreciseIntersection().
QList< QgsGeometry * > QgsGeometry::asGeometryCollection | ( | ) |
return contents of the geometry as a list of geometries
Definition at line 6144 of file qgsgeometry.cpp.
References exportWkbToGeos(), fromGeosGeom(), mGeos, QgsDebugMsg, and QgsGeometry().
GEOSGeometry * QgsGeometry::asGeos | ( | ) |
Returns a geos geomtry.
QgsGeometry keeps ownership, don't delete the returned object!
Definition at line 599 of file qgsgeometry.cpp.
References exportWkbToGeos(), mDirtyGeos, and mGeos.
Referenced by QgsPALGeometry::getGeosGeometry(), QgsOverlayObject::getGeosGeometry(), isGeosEmpty(), isGeosValid(), QgsPalLabeling::registerDiagramFeature(), QgsPalLayerSettings::registerFeature(), and QgsZonalStatistics::statisticsFromMiddlePointTest_improved().
return contents of the geometry as a multi point if wkbType is WKBMultiPoint, otherwise an empty list
Definition at line 5828 of file qgsgeometry.cpp.
References asPoint(), mGeometry, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, and wkbType().
Referenced by QgsRubberBand::addGeometry(), and deletePart().
return contents of the geometry as a multi polygon if wkbType is WKBMultiPolygon, otherwise an empty list
Definition at line 5871 of file qgsgeometry.cpp.
References asPolygon(), mGeometry, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, and wkbType().
Referenced by QgsRubberBand::addGeometry(), QgsVectorLayer::addTopologicalPoints(), deletePart(), deleteRing(), QgsGeometryAnalyzer::perimeterMeasure(), and validateGeometry().
return contents of the geometry as a multi linestring if wkbType is WKBMultiLineString, otherwise an empty list
Definition at line 5849 of file qgsgeometry.cpp.
References asPolyline(), mGeometry, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, and wkbType().
Referenced by QgsRubberBand::addGeometry(), QgsVectorLayer::addTopologicalPoints(), deletePart(), and validateGeometry().
return contents of the geometry as a point if wkbType is WKBPoint, otherwise returns [0,0]
Definition at line 5798 of file qgsgeometry.cpp.
References mGeometry, QGis::WKBPoint, QGis::WKBPoint25D, and wkbType().
Referenced by QgsRubberBand::addGeometry(), asMultiPoint(), QgsGeometryAnalyzer::simpleMeasure(), and QgsSearchTreeNode::valueAgainst().
QgsPoint QgsGeometry::asPoint | ( | unsigned char *& | ptr, |
bool | hasZValue | ||
) | [private] |
return point from wkb
Definition at line 5715 of file qgsgeometry.cpp.
return contents of the geometry as a polygon if wkbType is WKBPolygon, otherwise an empty list
Definition at line 5818 of file qgsgeometry.cpp.
References mGeometry, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsRubberBand::addGeometry(), QgsVectorLayer::addTopologicalPoints(), asMultiPolygon(), deleteRing(), QgsGeometryAnalyzer::perimeterMeasure(), and validateGeometry().
QgsPolygon QgsGeometry::asPolygon | ( | unsigned char *& | ptr, |
bool | hasZValue | ||
) | [private] |
return polygon from wkb
Definition at line 5756 of file qgsgeometry.cpp.
return contents of the geometry as a polyline if wkbType is WKBLineString, otherwise an empty list
Definition at line 5808 of file qgsgeometry.cpp.
References mGeometry, QGis::WKBLineString, QGis::WKBLineString25D, and wkbType().
Referenced by QgsRubberBand::addGeometry(), QgsVectorLayer::addTopologicalPoints(), asMultiPolyline(), and validateGeometry().
QgsPolyline QgsGeometry::asPolyline | ( | unsigned char *& | ptr, |
bool | hasZValue | ||
) | [private] |
return polyline from wkb
Definition at line 5729 of file qgsgeometry.cpp.
unsigned char * QgsGeometry::asWkb | ( | ) |
Returns the buffer containing this geometry in WKB format.
You may wish to use in conjunction with wkbSize().
Definition at line 578 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyWkb, and mGeometry.
Referenced by QgsVectorFileWriter::addFeature(), QgsInterpolator::addVerticesToCache(), QgsGeometryAnalyzer::dissolveFeature(), QgsVectorLayer::drawFeature(), QgsTINInterpolator::insertData(), QgsLabel::labelPoint(), QgsDistanceArea::measure(), QgsDistanceArea::measurePerimeter(), QgsFeatureRendererV2::renderFeature(), and wkbType().
int QgsGeometry::avoidIntersections | ( | ) |
Modifies geometry to avoid intersections with the layers specified in project properties.
Definition at line 6294 of file qgsgeometry.cpp.
References QgsMapLayerRegistry::instance(), QgsProject::instance(), QgsMapLayerRegistry::mapLayer(), QGis::Polygon, QgsProject::readListEntry(), QgsVectorLayer::removePolygonIntersections(), type(), and wkbType().
Returns the bounding box of this feature.
Definition at line 3431 of file qgsgeometry.cpp.
References exportGeosToWkb(), MathUtils::max(), mDirtyWkb, mGeometry, QgsDebugMsg, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsVectorLayer::boundingBoxOfSelected(), QgsZonalStatistics::calculateStatistics(), QgsSpatialIndex::featureInfo(), QgsOverlayAnalyzer::intersectFeature(), QgsVectorLayer::removePolygonIntersections(), QgsVectorLayer::snapWithContext(), and QgsVectorLayer::updateExtents().
QgsGeometry * QgsGeometry::buffer | ( | double | distance, |
int | segments | ||
) |
Returns a buffer region around this geometry having the given width and with a specified number of segments used to approximate curves.
Definition at line 5957 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), and mGeos.
Referenced by QgsGeometryAnalyzer::bufferFeature().
Returns the center of mass of a geometry.
Definition at line 5992 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), and mGeos.
Referenced by QgsGeometryAnalyzer::centroidFeature().
void QgsGeometry::checkRingIntersections | ( | QList< Error > & | errors, |
int | p0, | ||
int | i0, | ||
const QgsPolyline & | ring0, | ||
int | p1, | ||
int | i1, | ||
const QgsPolyline & | ring1 | ||
) | [static, private] |
Definition at line 6403 of file qgsgeometry.cpp.
References distLine2Point(), intersectLines(), QgsVector::length(), QgsVector::perpVector(), QgsDebugMsg, and QgsPoint::toString().
Referenced by validateGeometry(), and validatePolygon().
double QgsGeometry::closestSegmentWithContext | ( | const QgsPoint & | point, |
QgsPoint & | minDistPoint, | ||
int & | beforeVertex | ||
) |
Searches for the closest segment of geometry to the given point.
point | Specifies the point for search |
minDistPoint | Receives the nearest point on the segment |
beforeVertex | Receives index of the vertex before the closest segment. The vertex after the closest segment is always beforeVertex + 1 |
Definition at line 2402 of file qgsgeometry.cpp.
References exportGeosToWkb(), MathUtils::max(), mDirtyWkb, mGeometry, QgsDebugMsg, QgsPoint::sqrDistToSegment(), QgsPoint::toString(), QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, wkbType(), and QGis::WKBUnknown.
Referenced by QgsVectorLayer::snapToGeometry().
QgsPoint QgsGeometry::closestVertex | ( | const QgsPoint & | point, |
int & | atVertex, | ||
int & | beforeVertex, | ||
int & | afterVertex, | ||
double & | sqrDist | ||
) |
Returns the vertex closest to the given point, the corresponding vertex index, squared distance snap point / target point and the indices of the vertices before/after.
The vertices before/after are -1 if not present
Definition at line 692 of file qgsgeometry.cpp.
References exportGeosToWkb(), MathUtils::max(), mDirtyWkb, mGeometry, QgsDebugMsg, QgsPoint::sqrDist(), QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsVectorLayer::snapToGeometry().
double QgsGeometry::closestVertexWithContext | ( | const QgsPoint & | point, |
int & | atVertex | ||
) |
Searches for the the closest vertex in this geometry to the given point.
point | Specifiest the point for search |
atVertex | Receives index of the closest vertex |
Definition at line 2354 of file qgsgeometry.cpp.
References exportWkbToGeos(), MathUtils::max(), mGeos, and QgsPoint::sqrDist().
QgsGeometry * QgsGeometry::combine | ( | QgsGeometry * | geometry | ) |
Returns a geometry representing all the points in this geometry and other (a union geometry operation).
Definition at line 6053 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), mGeos, QgsGeometry(), QGis::WKBLineString, QGis::WKBLineString25D, and wkbType().
Referenced by QgsGeometryAnalyzer::bufferFeature(), QgsGeometryAnalyzer::convexFeature(), and QgsGeometryAnalyzer::dissolveFeature().
bool QgsGeometry::contains | ( | QgsPoint * | p | ) |
Test for containment of a point (uses GEOS)
Definition at line 3737 of file qgsgeometry.cpp.
References createGeosPoint(), exportWkbToGeos(), mGeos, and QgsDebugMsg.
Referenced by QgsZonalStatistics::statisticsFromMiddlePointTest().
bool QgsGeometry::contains | ( | QgsGeometry * | geometry | ) |
Test for if geometry is contained in an other (uses GEOS)
Definition at line 3789 of file qgsgeometry.cpp.
References geosRelOp().
bool QgsGeometry::convertToMultiType | ( | ) |
Converts single type geometry into multitype geometry e.g.
a polygon into a multipolygon geometry with one polygon
Definition at line 4749 of file qgsgeometry.cpp.
References QgsApplication::endian(), mDirtyGeos, mGeometry, mGeometrySize, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, wkbType(), and QGis::WKBUnknown.
Referenced by addIsland(), and makeDifference().
Returns the smallest convex polygon that contains all the points in the geometry.
Definition at line 6009 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), and mGeos.
Referenced by QgsGeometryAnalyzer::convexFeature(), and QgsGeometryAnalyzer::convexHull().
bool QgsGeometry::crosses | ( | QgsGeometry * | geometry | ) |
Test for if geometry crosses an other (uses GEOS)
Definition at line 3819 of file qgsgeometry.cpp.
References geosRelOp().
bool QgsGeometry::deletePart | ( | int | partNum | ) |
delete part identified by the part number
Definition at line 6231 of file qgsgeometry.cpp.
References asMultiPoint(), asMultiPolygon(), asMultiPolyline(), fromMultiPoint(), fromMultiPolygon(), fromMultiPolyline(), QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, and wkbType().
bool QgsGeometry::deleteRing | ( | int | ringNum, |
int | partNum = 0 |
||
) |
delete a ring in polygon or multipolygon.
Ring 0 is outer ring and can't be deleted.
Definition at line 6181 of file qgsgeometry.cpp.
References asMultiPolygon(), asPolygon(), fromMultiPolygon(), fromPolygon(), QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
bool QgsGeometry::deleteVertex | ( | int | atVertex | ) |
Deletes the vertex at the given position number and item (first number is index 0) Returns false if atVertex does not correspond to a valid vertex on this geometry (including if this geometry is a Point), or if the number of remaining verticies in the linestring would be less than two.
It is up to the caller to distinguish between these error conditions. (Or maybe we add another method to this object to help make the distinction?)
Definition at line 1500 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyGeos, mDirtyWkb, mGeometry, mGeometrySize, QgsDebugMsg, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBNoGeometry, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, wkbType(), and QGis::WKBUnknown.
Referenced by QgsVectorLayer::deleteVertex().
QgsGeometry * QgsGeometry::difference | ( | QgsGeometry * | geometry | ) |
Returns a geometry representing the points making up this geometry that do not make up other.
Definition at line 6092 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), and mGeos.
bool QgsGeometry::disjoint | ( | QgsGeometry * | geometry | ) |
Test for if geometry is disjoint of an other (uses GEOS)
Definition at line 3794 of file qgsgeometry.cpp.
References geosRelOp().
double QgsGeometry::distance | ( | QgsGeometry & | geom | ) |
Definition at line 5930 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), and mGeos.
bool QgsGeometry::equals | ( | QgsGeometry * | geometry | ) |
Test for if geometry equals an other (uses GEOS)
Definition at line 3799 of file qgsgeometry.cpp.
References geosRelOp().
bool QgsGeometry::exportGeosToWkb | ( | ) | [private] |
Converts from the GEOS geometry to the WKB geometry.
Definition at line 4354 of file qgsgeometry.cpp.
References QgsApplication::endian(), getNumGeosPoints(), mDirtyWkb, mGeometry, mGeometrySize, mGeos, QgsDebugMsg, QGis::WKBLineString, QGis::WKBMultiLineString, QGis::WKBMultiPoint, QGis::WKBMultiPolygon, QGis::WKBPoint, QGis::WKBPolygon, and wkbType().
Referenced by adjacentVertices(), asWkb(), boundingBox(), closestSegmentWithContext(), closestVertex(), deleteVertex(), exportToWkt(), insertVertex(), isMultipart(), moveVertex(), splitGeometry(), transform(), translate(), type(), vertexAt(), and wkbSize().
QString QgsGeometry::exportToWkt | ( | ) |
Exports the geometry to mWkt.
Definition at line 3824 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyWkb, mGeometry, QgsDebugMsg, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
bool QgsGeometry::exportWkbToGeos | ( | ) | [private] |
Converts from the WKB geometry to the GEOS geometry.
Definition at line 4104 of file qgsgeometry.cpp.
References CATCH_GEOS, createGeosCollection(), createGeosLinearRing(), createGeosLineString(), createGeosPoint(), createGeosPolygon(), mDirtyGeos, mGeometry, mGeos, QgsDebugMsgLevel, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, and QGis::WKBPolygon25D.
Referenced by addIsland(), addRing(), area(), asGeometryCollection(), asGeos(), buffer(), centroid(), closestVertexWithContext(), combine(), contains(), convexHull(), difference(), distance(), geosRelOp(), intersection(), intersects(), length(), makeDifference(), mergeGeometriesMultiTypeSplit(), reshapeGeometry(), simplify(), splitGeometry(), splitLinearGeometry(), splitPolygonGeometry(), and symDifference().
void QgsGeometry::fromGeos | ( | GEOSGeometry * | geos | ) |
Set the geometry, feeding in a geometry in GEOS format.
This class will take ownership of the buffer.
Definition at line 671 of file qgsgeometry.cpp.
References mDirtyGeos, mDirtyWkb, mGeometry, and mGeos.
Referenced by fromGeosGeom().
QgsGeometry * QgsGeometry::fromMultiPoint | ( | const QgsMultiPoint & | multipoint | ) | [static] |
construct geometry from a multipoint
Definition at line 441 of file qgsgeometry.cpp.
References createGeosCollection(), createGeosPoint(), and fromGeosGeom().
Referenced by deletePart().
QgsGeometry * QgsGeometry::fromMultiPolygon | ( | const QgsMultiPolygon & | multipoly | ) | [static] |
construct geometry from a multipolygon
Definition at line 485 of file qgsgeometry.cpp.
References createGeosCollection(), createGeosPolygon(), and fromGeosGeom().
Referenced by deletePart(), and deleteRing().
QgsGeometry * QgsGeometry::fromMultiPolyline | ( | const QgsMultiPolyline & | multiline | ) | [static] |
construct geometry from a multipolyline
Definition at line 464 of file qgsgeometry.cpp.
References createGeosCollection(), createGeosLineString(), and fromGeosGeom().
Referenced by QgsRubberBand::asGeometry(), and deletePart().
QgsGeometry * QgsGeometry::fromPoint | ( | const QgsPoint & | point | ) | [static] |
construct geometry from a point
Definition at line 426 of file qgsgeometry.cpp.
References createGeosPoint(), and fromGeosGeom().
QgsGeometry * QgsGeometry::fromPolygon | ( | const QgsPolygon & | polygon | ) | [static] |
construct geometry from a polygon
Definition at line 436 of file qgsgeometry.cpp.
References createGeosPolygon(), and fromGeosGeom().
Referenced by QgsRubberBand::asGeometry(), deleteRing(), and fromRect().
QgsGeometry * QgsGeometry::fromPolyline | ( | const QgsPolyline & | polyline | ) | [static] |
construct geometry from a polyline
Definition at line 431 of file qgsgeometry.cpp.
References createGeosLineString(), and fromGeosGeom().
Referenced by QgsRubberBand::asGeometry(), and QgsGeometryAnalyzer::perimeterMeasure().
QgsGeometry * QgsGeometry::fromRect | ( | const QgsRectangle & | rect | ) | [static] |
construct geometry from a rectangle
Definition at line 509 of file qgsgeometry.cpp.
References fromPolygon(), QgsRectangle::xMaximum(), QgsRectangle::xMinimum(), QgsRectangle::yMaximum(), and QgsRectangle::yMinimum().
Referenced by QgsGeometryAnalyzer::extent(), intersects(), and QgsZonalStatistics::statisticsFromPreciseIntersection().
void QgsGeometry::fromWkb | ( | unsigned char * | wkb, |
size_t | length | ||
) |
Set the geometry, feeding in the buffer containing OGC Well-Known Binary and the buffer's length.
This class will take ownership of the buffer.
Definition at line 557 of file qgsgeometry.cpp.
References length(), mDirtyGeos, mDirtyWkb, mGeometry, mGeometrySize, and mGeos.
Referenced by QgsFeature::setGeometryAndOwnership().
QgsGeometry * QgsGeometry::fromWkt | ( | QString | wkt | ) | [static] |
static method that creates geometry from Wkt
Definition at line 406 of file qgsgeometry.cpp.
References fromGeosGeom().
bool QgsGeometry::geomInDegrees | ( | const GEOSGeometry * | geom | ) | [static, private] |
Tests if geom bounding rect is within -180 <= x <= 180, -90 <= y <= 90.
Other methods may use more accurate tolerances if this is true
Definition at line 5573 of file qgsgeometry.cpp.
Referenced by lineContainedInLine(), and pointContainedInLine().
bool QgsGeometry::geosRelOp | ( | char(*)(const GEOSGeometry *, const GEOSGeometry *) | op, |
QgsGeometry * | a, | ||
QgsGeometry * | b | ||
) | [static, private] |
Definition at line 3768 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), mGeos, and QgsDebugMsg.
Referenced by contains(), crosses(), disjoint(), equals(), isGeosEqual(), overlaps(), touches(), and within().
bool QgsGeometry::insertVertex | ( | double | x, |
double | y, | ||
int | beforeVertex | ||
) |
Insert a new vertex before the given vertex index, ring and item (first number is index 0) If the requested vertex number (beforeVertex.back()) is greater than the last actual vertex on the requested ring and item, it is assumed that the vertex is to be appended instead of inserted.
Returns false if atVertex does not correspond to a valid vertex on this geometry (including if this geometry is a Point). It is up to the caller to distinguish between these error conditions. (Or maybe we add another method to this object to help make the distinction?)
Definition at line 1829 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyGeos, mDirtyWkb, mGeometry, mGeometrySize, QgsDebugMsg, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBNoGeometry, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, wkbType(), and QGis::WKBUnknown.
Referenced by QgsVectorLayer::insertVertex().
bool QgsGeometry::insertVertex | ( | double | x, |
double | y, | ||
int | beforeVertex, | ||
const GEOSCoordSequence * | old_sequence, | ||
GEOSCoordSequence ** | new_sequence | ||
) | [private] |
Insert a new vertex before the given vertex index (first number is index 0) in the given GEOS Coordinate Sequence.
If the requested vertex number is greater than the last actual vertex, it is assumed that the vertex is to be appended instead of inserted.
x | x coordinate |
y | y coordinate |
beforeVertex | insert before vertex with this index |
old_sequence | The sequence to update (The caller remains the owner). |
new_sequence | The updated sequence (The caller becomes the owner if the function returns true). Returns false if beforeVertex does not correspond to a valid vertex number on the Coordinate Sequence. |
Definition at line 1199 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::intersection | ( | QgsGeometry * | geometry | ) |
Returns a geometry representing the points shared by this geometry and other.
Definition at line 6027 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), and mGeos.
Referenced by QgsOverlayAnalyzer::intersectFeature(), and QgsZonalStatistics::statisticsFromPreciseIntersection().
bool QgsGeometry::intersects | ( | const QgsRectangle & | r | ) |
Test for intersection with a rectangle (uses GEOS)
Definition at line 3709 of file qgsgeometry.cpp.
References fromRect().
Referenced by QgsOverlayAnalyzer::intersectFeature().
bool QgsGeometry::intersects | ( | QgsGeometry * | geometry | ) |
Test for intersection with a geometry (uses GEOS)
Definition at line 3717 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), mGeos, and QgsDebugMsg.
bool QgsGeometry::isGeosEmpty | ( | ) |
check if geometry is empty using GEOS
Definition at line 6655 of file qgsgeometry.cpp.
References asGeos(), QgsDebugMsg, and GEOSException::what().
bool QgsGeometry::isGeosEqual | ( | QgsGeometry & | g | ) |
compare geometries using GEOS
Definition at line 6650 of file qgsgeometry.cpp.
References geosRelOp().
bool QgsGeometry::isGeosValid | ( | ) |
check validity using GEOS
Definition at line 6630 of file qgsgeometry.cpp.
References asGeos(), QgsDebugMsg, and GEOSException::what().
bool QgsGeometry::isMultipart | ( | ) |
Returns true if wkb of the geometry is of WKBMulti* type.
Definition at line 650 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyWkb, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, and wkbType().
Referenced by makeDifference(), and QgsGeometryAnalyzer::perimeterMeasure().
double QgsGeometry::length | ( | ) |
get length of geometry using GEOS
Definition at line 5912 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), and mGeos.
Referenced by QgsPalLayerSettings::checkMinimumSizeMM(), and fromWkb().
int QgsGeometry::lineContainedInLine | ( | const GEOSGeometry * | line1, |
const GEOSGeometry * | line2 | ||
) | [static, private] |
Tests if line1 is completely contained in line2.
This method works with a very small buffer around line2 and therefore is less prone to numerical errors as the corresponding geos method
Definition at line 5506 of file qgsgeometry.cpp.
References DEFAULT_QUADRANT_SEGMENTS, and geomInDegrees().
Referenced by reshapeLine(), and splitLinearGeometry().
int QgsGeometry::makeDifference | ( | QgsGeometry * | other | ) |
Changes this geometry such that it does not intersect the other geometry.
other | geometry that should not be intersect |
Definition at line 3364 of file qgsgeometry.cpp.
References CATCH_GEOS, convertToMultiType(), exportWkbToGeos(), isMultipart(), mDirtyGeos, mDirtyWkb, and mGeos.
Referenced by QgsVectorLayer::removePolygonIntersections().
int QgsGeometry::mergeGeometriesMultiTypeSplit | ( | QVector< GEOSGeometry * > & | splitResult | ) | [private] |
Definition at line 5634 of file qgsgeometry.cpp.
References createGeosCollection(), exportWkbToGeos(), mDirtyGeos, and mGeos.
Referenced by splitLinearGeometry(), and splitPolygonGeometry().
bool QgsGeometry::moveVertex | ( | double | x, |
double | y, | ||
int | atVertex | ||
) |
Moves the vertex at the given position number and item (first number is index 0) to the given coordinates.
Returns false if atVertex does not correspond to a valid vertex on this geometry
Definition at line 1251 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyGeos, mDirtyWkb, mGeometry, QgsDebugMsg, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsVectorLayer::moveVertex().
GEOSGeometry * QgsGeometry::nodeGeometries | ( | const GEOSGeometry * | splitLine, |
const GEOSGeometry * | poly | ||
) | [static, private] |
Nodes together a split line and a (multi-) polygon geometry in a multilinestring.
Definition at line 5481 of file qgsgeometry.cpp.
Referenced by reshapeLine(), splitLinearGeometry(), and splitPolygonGeometry().
int QgsGeometry::numberOfGeometries | ( | GEOSGeometry * | g | ) | const [private] |
Returns number of single geometry in a geos geometry.
Is save for geos 2 and 3
Definition at line 5617 of file qgsgeometry.cpp.
Referenced by splitPolygonGeometry().
QgsGeometry & QgsGeometry::operator= | ( | QgsGeometry const & | rhs | ) |
assignments will prompt a deep copy of the object
Definition at line 524 of file qgsgeometry.cpp.
References mDirtyGeos, mDirtyWkb, mGeometry, mGeometrySize, and mGeos.
bool QgsGeometry::overlaps | ( | QgsGeometry * | geometry | ) |
Test for if geometry overlaps an other (uses GEOS)
Definition at line 3809 of file qgsgeometry.cpp.
References geosRelOp().
int QgsGeometry::pointContainedInLine | ( | const GEOSGeometry * | point, |
const GEOSGeometry * | line | ||
) | [static, private] |
Tests if a point is on a line.
This method works with a very small buffer and is thus less prone to numerical problems as the direct geos functions.
point | the point to test |
line | line to test |
Definition at line 5545 of file qgsgeometry.cpp.
References geomInDegrees().
Referenced by reshapeLine().
int QgsGeometry::reshapeGeometry | ( | const QList< QgsPoint > & | reshapeWithLine | ) |
Replaces a part of this geometry with another line.
Definition at line 3240 of file qgsgeometry.cpp.
References createGeosLineString(), exportWkbToGeos(), QGis::Line, mDirtyGeos, mDirtyWkb, mGeos, QGis::Point, reshapeLine(), reshapePolygon(), and type().
GEOSGeometry * QgsGeometry::reshapeLine | ( | const GEOSGeometry * | origLine, |
const GEOSGeometry * | reshapeLineGeos | ||
) | [static, private] |
Creates a new line from an original line and a reshape line.
The part of the input line from the first to the last intersection with the \ reshape line will be replaced. The calling function takes ownership of the result.
origLine | the original line |
reshapeLineGeos | the reshape line |
Definition at line 5180 of file qgsgeometry.cpp.
References createGeosPoint(), lineContainedInLine(), nodeGeometries(), and pointContainedInLine().
Referenced by reshapeGeometry(), and reshapePolygon().
GEOSGeometry * QgsGeometry::reshapePolygon | ( | const GEOSGeometry * | polygon, |
const GEOSGeometry * | reshapeLineGeos | ||
) | [static, private] |
Creates a new polygon replacing the part from the first to the second intersection with the reshape line.
As a polygon ring is always closed, the method keeps the longer part of the existing boundary
polygon | geometry to reshape |
reshapeLineGeos | the reshape line |
Definition at line 5047 of file qgsgeometry.cpp.
References reshapeLine().
Referenced by reshapeGeometry().
QgsGeometry * QgsGeometry::simplify | ( | double | tolerance | ) |
Returns a simplified version of this geometry using a specified tolerance value.
Definition at line 5975 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), and mGeos.
Referenced by QgsGeometryAnalyzer::simplifyFeature().
int QgsGeometry::splitGeometry | ( | const QList< QgsPoint > & | splitLine, |
QList< QgsGeometry * > & | newGeometries, | ||
bool | topological, | ||
QList< QgsPoint > & | topologyTestPoints | ||
) |
Splits this geometry according to a given line.
Note that the geometry is only split once. If there are several intersections between geometry and splitLine, only the first one is considered.
splitLine | the line that splits the geometry | |
[out] | newGeometries | list of new geometries that have been created with the split |
topological | true if topological editing is enabled | |
[out] | topologyTestPoints | points that need to be tested for topological completeness in the dataset |
Definition at line 3165 of file qgsgeometry.cpp.
References CATCH_GEOS, createGeosLineString(), exportGeosToWkb(), exportWkbToGeos(), QGis::Line, mDirtyGeos, mDirtyWkb, mGeos, QGis::Point, QGis::Polygon, splitLinearGeometry(), splitPolygonGeometry(), topologicalTestPointsSplit(), and type().
Referenced by QgsVectorLayer::splitFeatures().
int QgsGeometry::splitLinearGeometry | ( | GEOSGeometry * | splitLine, |
QList< QgsGeometry * > & | newGeometries | ||
) | [private] |
Splits line/multiline geometries.
splitLine | the line that splits the feature |
newGeometries | new geometries if splitting was successful |
Definition at line 4866 of file qgsgeometry.cpp.
References exportWkbToGeos(), fromGeosGeom(), lineContainedInLine(), mDirtyGeos, mDirtyWkb, mergeGeometriesMultiTypeSplit(), mGeos, and nodeGeometries().
Referenced by splitGeometry().
int QgsGeometry::splitPolygonGeometry | ( | GEOSGeometry * | splitLine, |
QList< QgsGeometry * > & | newGeometries | ||
) | [private] |
Splits polygon/multipolygon geometries.
Definition at line 4927 of file qgsgeometry.cpp.
References exportWkbToGeos(), fromGeosGeom(), mDirtyGeos, mDirtyWkb, mergeGeometriesMultiTypeSplit(), mGeos, nodeGeometries(), numberOfGeometries(), and QgsDebugMsg.
Referenced by splitGeometry().
double QgsGeometry::sqrDistToVertexAt | ( | QgsPoint & | point, |
int | atVertex | ||
) |
Returns the squared cartesian distance between the given point to the given vertex index (vertex at the given position number, ring and item (first number is index 0))
Definition at line 2337 of file qgsgeometry.cpp.
References MathUtils::max(), QgsDebugMsg, QgsPoint::sqrDist(), QgsPoint::toString(), and vertexAt().
QgsGeometry * QgsGeometry::symDifference | ( | QgsGeometry * | geometry | ) |
Returns a Geometry representing the points making up this Geometry that do not make up other.
Definition at line 6118 of file qgsgeometry.cpp.
References CATCH_GEOS, exportWkbToGeos(), fromGeosGeom(), and mGeos.
int QgsGeometry::topologicalTestPointsSplit | ( | const GEOSGeometry * | splitLine, |
QList< QgsPoint > & | testPoints | ||
) | const [private] |
Finds out the points that need to be tested for topological correctnes if this geometry will be split.
Definition at line 5423 of file qgsgeometry.cpp.
References mGeos.
Referenced by splitGeometry().
bool QgsGeometry::touches | ( | QgsGeometry * | geometry | ) |
Test for if geometry touch an other (uses GEOS)
Definition at line 3804 of file qgsgeometry.cpp.
References geosRelOp().
int QgsGeometry::transform | ( | const QgsCoordinateTransform & | ct | ) |
Transform this geometry as described by CoordinateTranasform ct.
Definition at line 3039 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyGeos, mDirtyWkb, mGeometry, QgsDebugMsg, transformVertex(), QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsPalLabeling::registerDiagramFeature(), QgsPalLayerSettings::registerFeature(), and QgsVectorFileWriter::writeAsVectorFormat().
void QgsGeometry::transformVertex | ( | int & | wkbPosition, |
const QgsCoordinateTransform & | ct, | ||
bool | hasZValue | ||
) | [private] |
Transforms a single vertex by ct.
wkbPosition | position in wkb array. Is increased automatically by the function |
ct | the QgsCoordinateTransform |
hasZValue | 25D type? |
Definition at line 4841 of file qgsgeometry.cpp.
References mGeometry, and QgsCoordinateTransform::transformInPlace().
Referenced by transform().
int QgsGeometry::translate | ( | double | dx, |
double | dy | ||
) |
Translate this geometry by dx, dy.
Definition at line 2913 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyGeos, mDirtyWkb, mGeometry, QgsDebugMsg, translateVertex(), QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsVectorLayer::translateFeature().
void QgsGeometry::translateVertex | ( | int & | wkbPosition, |
double | dx, | ||
double | dy, | ||
bool | hasZValue | ||
) | [private] |
Translates a single vertex by dx and dy.
wkbPosition | position in wkb array. Is increased automatically by the function |
dx | translation of x-coordinate |
dy | translation of y-coordinate |
hasZValue | 25D type? |
Definition at line 4819 of file qgsgeometry.cpp.
References mGeometry.
Referenced by translate().
Returns type of the vector.
Definition at line 628 of file qgsgeometry.cpp.
References exportGeosToWkb(), QGis::Line, mDirtyWkb, QGis::Point, QGis::Polygon, QGis::UnknownGeometry, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by addRing(), avoidIntersections(), QgsPalLayerSettings::checkMinimumSizeMM(), QgsVectorLayer::removePolygonIntersections(), reshapeGeometry(), QgsUndoCommand::GeometryChangeEntry::setOriginalGeometry(), QgsUndoCommand::GeometryChangeEntry::setTargetGeometry(), QgsGeometryAnalyzer::simpleMeasure(), splitGeometry(), and QgsSearchTreeNode::valueAgainst().
void QgsGeometry::validateGeometry | ( | QList< Error > & | errors | ) |
Validate geometry and produce a list of geometry errors.
Definition at line 6559 of file qgsgeometry.cpp.
References asMultiPolygon(), asMultiPolyline(), asPolygon(), asPolyline(), checkRingIntersections(), QgsDebugMsg, ringInRing(), validatePolygon(), validatePolyline(), QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBNoGeometry, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, wkbType(), and QGis::WKBUnknown.
void QgsGeometry::validatePolygon | ( | QList< Error > & | errors, |
int | i, | ||
const QgsPolygon & | polygon | ||
) | [static] |
Definition at line 6530 of file qgsgeometry.cpp.
References checkRingIntersections(), QgsDebugMsg, ringInRing(), and validatePolyline().
Referenced by validateGeometry().
void QgsGeometry::validatePolyline | ( | QList< Error > & | errors, |
int | i, | ||
QgsPolyline | polyline, | ||
bool | ring = false |
||
) | [static] |
Definition at line 6445 of file qgsgeometry.cpp.
References distLine2Point(), intersectLines(), QgsVector::length(), QgsVector::perpVector(), QgsDebugMsg, and QgsPoint::toString().
Referenced by validateGeometry(), and validatePolygon().
QgsPoint QgsGeometry::vertexAt | ( | int | atVertex | ) |
Returns coordinates of a vertex.
atVertex | index of the vertex |
Definition at line 2134 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyWkb, mGeometry, QgsDebugMsg, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, and wkbType().
Referenced by QgsVectorLayer::snapToGeometry(), and sqrDistToVertexAt().
bool QgsGeometry::within | ( | QgsGeometry * | geometry | ) |
Test for if geometry is within an other (uses GEOS)
Definition at line 3814 of file qgsgeometry.cpp.
References geosRelOp().
size_t QgsGeometry::wkbSize | ( | ) |
Returns the size of the WKB in asWkb().
Definition at line 589 of file qgsgeometry.cpp.
References exportGeosToWkb(), mDirtyWkb, and mGeometrySize.
Referenced by QgsVectorFileWriter::addFeature(), QgsGeometryAnalyzer::dissolveFeature(), and QgsLabel::labelPoint().
Returns type of wkb (point / linestring / polygon etc.)
Definition at line 612 of file qgsgeometry.cpp.
References asWkb(), and QGis::WKBUnknown.
Referenced by QgsVectorFileWriter::addFeature(), QgsRubberBand::addGeometry(), addIsland(), addRing(), QgsVectorLayer::addTopologicalPoints(), QgsInterpolator::addVerticesToCache(), adjacentVertices(), asMultiPoint(), asMultiPolygon(), asMultiPolyline(), asPoint(), asPolygon(), asPolyline(), avoidIntersections(), boundingBox(), closestSegmentWithContext(), closestVertex(), combine(), convertToMultiType(), deletePart(), deleteRing(), deleteVertex(), QgsVectorLayer::drawFeature(), exportGeosToWkb(), exportToWkt(), QgsTINInterpolator::insertData(), insertVertex(), isMultipart(), QgsLabel::labelPoint(), moveVertex(), QgsFeatureRendererV2::renderFeature(), QgsGeometryAnalyzer::simpleMeasure(), transform(), translate(), type(), validateGeometry(), and vertexAt().
bool QgsGeometry::mDirtyGeos [private] |
If the geometry has been set since the last conversion to GEOS.
Definition at line 464 of file qgsgeometry.h.
Referenced by addIsland(), addRing(), asGeos(), convertToMultiType(), deleteVertex(), exportWkbToGeos(), fromGeos(), fromWkb(), insertVertex(), makeDifference(), mergeGeometriesMultiTypeSplit(), moveVertex(), operator=(), reshapeGeometry(), splitGeometry(), splitLinearGeometry(), splitPolygonGeometry(), transform(), and translate().
bool QgsGeometry::mDirtyWkb [private] |
If the geometry has been set since the last conversion to WKB.
Definition at line 461 of file qgsgeometry.h.
Referenced by addIsland(), addRing(), adjacentVertices(), asWkb(), boundingBox(), closestSegmentWithContext(), closestVertex(), deleteVertex(), exportGeosToWkb(), exportToWkt(), fromGeos(), fromWkb(), insertVertex(), isMultipart(), makeDifference(), moveVertex(), operator=(), reshapeGeometry(), splitGeometry(), splitLinearGeometry(), splitPolygonGeometry(), transform(), translate(), type(), vertexAt(), and wkbSize().
unsigned char* QgsGeometry::mGeometry [private] |
pointer to geometry in binary WKB format This is the class' native implementation
Definition at line 452 of file qgsgeometry.h.
Referenced by adjacentVertices(), asMultiPoint(), asMultiPolygon(), asMultiPolyline(), asPoint(), asPolygon(), asPolyline(), asWkb(), boundingBox(), closestSegmentWithContext(), closestVertex(), convertToMultiType(), deleteVertex(), exportGeosToWkb(), exportToWkt(), exportWkbToGeos(), fromGeos(), fromWkb(), insertVertex(), moveVertex(), operator=(), QgsGeometry(), transform(), transformVertex(), translate(), translateVertex(), vertexAt(), and ~QgsGeometry().
size_t QgsGeometry::mGeometrySize [private] |
size of geometry
Definition at line 455 of file qgsgeometry.h.
Referenced by convertToMultiType(), deleteVertex(), exportGeosToWkb(), fromWkb(), insertVertex(), operator=(), QgsGeometry(), and wkbSize().
GEOSGeometry* QgsGeometry::mGeos [private] |
cached GEOS version of this geometry
Definition at line 458 of file qgsgeometry.h.
Referenced by addIsland(), addRing(), area(), asGeometryCollection(), asGeos(), buffer(), centroid(), closestVertexWithContext(), combine(), contains(), convexHull(), difference(), distance(), exportGeosToWkb(), exportWkbToGeos(), fromGeos(), fromWkb(), geosRelOp(), intersection(), intersects(), length(), makeDifference(), mergeGeometriesMultiTypeSplit(), operator=(), QgsGeometry(), reshapeGeometry(), simplify(), splitGeometry(), splitLinearGeometry(), splitPolygonGeometry(), symDifference(), topologicalTestPointsSplit(), and ~QgsGeometry().
int QgsGeometry::refcount [static, private] |
Definition at line 577 of file qgsgeometry.h.