QGIS API Documentation
2.8.2-Wien
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#include <qgsgeometry.h>
Classes | |
class | Error |
Public Member Functions | |
QgsGeometry () | |
Constructor. | |
QgsGeometry (const QgsGeometry &) | |
copy constructor will prompt a deep copy of the object | |
~QgsGeometry () | |
Destructor. | |
int | addPart (const QList< QgsPoint > &points, QGis::GeometryType geomType=QGis::UnknownGeometry) |
Adds a new island polygon to a multipolygon feature. | |
int | addPart (GEOSGeometry *newPart) |
Adds a new island polygon to a multipolygon feature. | |
int | addPart (QgsGeometry *newPart) |
Adds a new island polygon to a multipolygon feature. | |
int | addRing (const QList< QgsPoint > &ring) |
Adds a new ring to this geometry. | |
void | adjacentVertices (int atVertex, int &beforeVertex, int &afterVertex) |
Returns the indexes of the vertices before and after the given vertex index. | |
double | area () |
get area of geometry using GEOS | |
QList< QgsGeometry * > | asGeometryCollection () const |
return contents of the geometry as a list of geometries | |
const GEOSGeometry * | asGeos () const |
Returns a geos geometry. | |
QgsMultiPoint | asMultiPoint () const |
return contents of the geometry as a multi point if wkbType is WKBMultiPoint, otherwise an empty list | |
QgsMultiPolygon | asMultiPolygon () const |
return contents of the geometry as a multi polygon if wkbType is WKBMultiPolygon, otherwise an empty list | |
QgsMultiPolyline | asMultiPolyline () const |
return contents of the geometry as a multi linestring if wkbType is WKBMultiLineString, otherwise an empty list | |
QgsPoint | asPoint () const |
return contents of the geometry as a point if wkbType is WKBPoint, otherwise returns [0,0] | |
QgsPolygon | asPolygon () const |
return contents of the geometry as a polygon if wkbType is WKBPolygon, otherwise an empty list | |
QgsPolyline | asPolyline () const |
return contents of the geometry as a polyline if wkbType is WKBLineString, otherwise an empty list | |
QPointF | asQPointF () const |
Return contents of the geometry as a QPointF if wkbType is WKBPoint, otherwise returns a null QPointF. | |
QPolygonF | asQPolygonF () const |
Return contents of the geometry as a QPolygonF. | |
const unsigned char * | asWkb () const |
Returns the buffer containing this geometry in WKB format. | |
int | avoidIntersections (QMap< QgsVectorLayer *, QSet< QgsFeatureId > > ignoreFeatures=(QMap< QgsVectorLayer *, QSet< QgsFeatureId > >())) |
Modifies geometry to avoid intersections with the layers specified in project properties. | |
QgsRectangle | boundingBox () |
Returns the bounding box of this feature. | |
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 * | buffer (double distance, int segments, int endCapStyle, int joinStyle, double mitreLimit) |
Returns a buffer region around the geometry, with additional style options. | |
QgsGeometry * | centroid () |
Returns the center of mass of a geometry. | |
double | closestSegmentWithContext (const QgsPoint &point, QgsPoint &minDistPoint, int &afterVertex, double *leftOf=0, double epsilon=DEFAULT_SEGMENT_EPSILON) |
Searches for the closest segment of geometry to the given point. | |
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. | |
double | closestVertexWithContext (const QgsPoint &point, int &atVertex) |
Searches for the closest vertex in this geometry to the given point. | |
QgsGeometry * | combine (QgsGeometry *geometry) |
Returns a geometry representing all the points in this geometry and other (a union geometry operation). | |
bool | contains (const QgsPoint *p) const |
Test for containment of a point (uses GEOS) | |
bool | contains (const QgsGeometry *geometry) const |
Test for if geometry is contained in another (uses GEOS) | |
bool | convertToMultiType () |
Converts single type geometry into multitype geometry e.g. | |
QgsGeometry * | convertToType (QGis::GeometryType destType, bool destMultipart=false) |
try to convert the geometry to the requested type | |
QgsGeometry * | convexHull () |
Returns the smallest convex polygon that contains all the points in the geometry. | |
bool | crosses (const QgsGeometry *geometry) const |
Test for if geometry crosses another (uses GEOS) | |
bool | deletePart (int partNum) |
delete part identified by the part number | |
bool | deleteRing (int ringNum, int partNum=0) |
delete a ring in polygon or multipolygon. | |
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. | |
QgsGeometry * | difference (QgsGeometry *geometry) |
Returns a geometry representing the points making up this geometry that do not make up other. | |
bool | disjoint (const QgsGeometry *geometry) const |
Test for if geometry is disjoint of another (uses GEOS) | |
double | distance (QgsGeometry &geom) |
bool | equals (const QgsGeometry *geometry) const |
Test for if geometry equals another (uses GEOS) | |
QString | exportToGeoJSON (const int &precision=17) const |
Exports the geometry to GeoJSON. | |
QString | exportToWkt (const int &precision=17) const |
Exports the geometry to WKT. | |
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. | |
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. | |
QgsGeometry * | interpolate (double distance) |
QgsGeometry * | intersection (QgsGeometry *geometry) |
Returns a geometry representing the points shared by this geometry and other. | |
bool | intersects (const QgsRectangle &r) const |
Test for intersection with a rectangle (uses GEOS) | |
bool | intersects (const QgsGeometry *geometry) const |
Test for intersection with a geometry (uses GEOS) | |
bool | isGeosEmpty () |
check if geometry is empty using GEOS | |
bool | isGeosEqual (QgsGeometry &) |
compare geometries using GEOS | |
bool | isGeosValid () |
check validity using GEOS | |
bool | isMultipart () const |
Returns true if wkb of the geometry is of WKBMulti* type. | |
double | length () |
get length of geometry using GEOS | |
int | makeDifference (QgsGeometry *other) |
Changes this geometry such that it does not intersect the other geometry. | |
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. | |
QgsGeometry * | offsetCurve (double distance, int segments, int joinStyle, double mitreLimit) |
Returns an offset line at a given distance and side from an input line. | |
QgsGeometry & | operator= (QgsGeometry const &rhs) |
assignments will prompt a deep copy of the object | |
bool | overlaps (const QgsGeometry *geometry) const |
Test for if geometry overlaps another (uses GEOS) | |
QgsGeometry * | pointOnSurface () |
Returns a point within a geometry. | |
int | reshapeGeometry (const QList< QgsPoint > &reshapeWithLine) |
Replaces a part of this geometry with another line. | |
int | rotate (double rotation, const QgsPoint ¢er) |
Rotate this geometry around the Z axis. | |
QgsGeometry * | simplify (double tolerance) |
Returns a simplified version of this geometry using a specified tolerance value. | |
int | splitGeometry (const QList< QgsPoint > &splitLine, QList< QgsGeometry * > &newGeometries, bool topological, QList< QgsPoint > &topologyTestPoints) |
Splits this geometry according to a given line. | |
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)) | |
QgsGeometry * | symDifference (QgsGeometry *geometry) |
Returns a Geometry representing the points making up this Geometry that do not make up other. | |
bool | touches (const QgsGeometry *geometry) const |
Test for if geometry touch another (uses GEOS) | |
int | transform (const QgsCoordinateTransform &ct) |
Transform this geometry as described by CoordinateTranasform ct. | |
int | transform (const QTransform &ct) |
Transform this geometry as described by QTransform ct. | |
int | translate (double dx, double dy) |
Translate this geometry by dx, dy. | |
QGis::GeometryType | type () const |
Returns type of the vector. | |
void | validateGeometry (QList< Error > &errors) |
Validate geometry and produce a list of geometry errors. | |
QgsPoint | vertexAt (int atVertex) |
Returns coordinates of a vertex. | |
bool | within (const QgsGeometry *geometry) const |
Test for if geometry is within another (uses GEOS) | |
size_t | wkbSize () const |
Returns the size of the WKB in asWkb(). | |
QGis::WkbType | wkbType () const |
Returns type of wkb (point / linestring / polygon etc.) |
Static Public Member Functions | |
static QgsGeometry * | fromMultiPoint (const QgsMultiPoint &multipoint) |
construct geometry from a multipoint | |
static QgsGeometry * | fromMultiPolygon (const QgsMultiPolygon &multipoly) |
construct geometry from a multipolygon | |
static QgsGeometry * | fromMultiPolyline (const QgsMultiPolyline &multiline) |
construct geometry from a multipolyline | |
static QgsGeometry * | fromPoint (const QgsPoint &point) |
construct geometry from a point | |
static QgsGeometry * | fromPolygon (const QgsPolygon &polygon) |
construct geometry from a polygon | |
static QgsGeometry * | fromPolyline (const QgsPolyline &polyline) |
construct geometry from a polyline | |
static QgsGeometry * | fromQPointF (const QPointF &point) |
Construct geometry from a QPointF. | |
static QgsGeometry * | fromQPolygonF (const QPolygonF &polygon) |
Construct geometry from a QPolygonF. | |
static QgsGeometry * | fromRect (const QgsRectangle &rect) |
construct geometry from a rectangle | |
static QgsGeometry * | fromWkt (QString wkt) |
static method that creates geometry from Wkt | |
static GEOSContextHandle_t | getGEOSHandler () |
return GEOS context handle | |
static QgsGeometry * | unaryUnion (const QList< QgsGeometry * > &geometryList) |
compute the unary union on a list of geometries. |
Definition at line 69 of file qgsgeometry.h.
QgsGeometry::QgsGeometry | ( | ) |
Constructor.
Definition at line 145 of file qgsgeometry.cpp.
QgsGeometry::QgsGeometry | ( | const QgsGeometry & | rhs | ) |
copy constructor will prompt a deep copy of the object
Definition at line 154 of file qgsgeometry.cpp.
QgsGeometry::~QgsGeometry | ( | ) |
Destructor.
Definition at line 175 of file qgsgeometry.cpp.
int QgsGeometry::addPart | ( | const QList< QgsPoint > & | points, |
QGis::GeometryType | geomType = QGis::UnknownGeometry |
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) |
Adds a new island polygon to a multipolygon feature.
Definition at line 2541 of file qgsgeometry.cpp.
int QgsGeometry::addPart | ( | GEOSGeometry * | newPart | ) |
Adds a new island polygon to a multipolygon feature.
Definition at line 2648 of file qgsgeometry.cpp.
int QgsGeometry::addPart | ( | QgsGeometry * | newPart | ) |
Adds a new island polygon to a multipolygon feature.
Definition at line 2639 of file qgsgeometry.cpp.
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 2343 of file qgsgeometry.cpp.
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:
Definition at line 961 of file qgsgeometry.cpp.
double QgsGeometry::area | ( | ) |
get area of geometry using GEOS
Definition at line 5669 of file qgsgeometry.cpp.
QList< QgsGeometry * > QgsGeometry::asGeometryCollection | ( | ) | const |
return contents of the geometry as a list of geometries
Definition at line 5963 of file qgsgeometry.cpp.
const GEOSGeometry * QgsGeometry::asGeos | ( | ) | const |
Returns a geos geometry.
QgsGeometry keeps ownership, don't delete the returned object!
Definition at line 621 of file qgsgeometry.cpp.
QgsMultiPoint QgsGeometry::asMultiPoint | ( | ) | const |
return contents of the geometry as a multi point if wkbType is WKBMultiPoint, otherwise an empty list
Definition at line 5605 of file qgsgeometry.cpp.
QgsMultiPolygon QgsGeometry::asMultiPolygon | ( | ) | const |
return contents of the geometry as a multi polygon if wkbType is WKBMultiPolygon, otherwise an empty list
Definition at line 5648 of file qgsgeometry.cpp.
QgsMultiPolyline QgsGeometry::asMultiPolyline | ( | ) | const |
return contents of the geometry as a multi linestring if wkbType is WKBMultiLineString, otherwise an empty list
Definition at line 5627 of file qgsgeometry.cpp.
QgsPoint QgsGeometry::asPoint | ( | ) | const |
return contents of the geometry as a point if wkbType is WKBPoint, otherwise returns [0,0]
Definition at line 5575 of file qgsgeometry.cpp.
QgsPolygon QgsGeometry::asPolygon | ( | ) | const |
return contents of the geometry as a polygon if wkbType is WKBPolygon, otherwise an empty list
Definition at line 5595 of file qgsgeometry.cpp.
QgsPolyline QgsGeometry::asPolyline | ( | ) | const |
return contents of the geometry as a polyline if wkbType is WKBLineString, otherwise an empty list
Definition at line 5585 of file qgsgeometry.cpp.
QPointF QgsGeometry::asQPointF | ( | ) | const |
Return contents of the geometry as a QPointF if wkbType is WKBPoint, otherwise returns a null QPointF.
Definition at line 5998 of file qgsgeometry.cpp.
QPolygonF QgsGeometry::asQPolygonF | ( | ) | const |
Return contents of the geometry as a QPolygonF.
If geometry is a linestring, then the result will be an open QPolygonF. If the geometry is a polygon, then the result will be a closed QPolygonF of the geometry's exterior ring.
Definition at line 6004 of file qgsgeometry.cpp.
const unsigned char * QgsGeometry::asWkb | ( | ) | const |
Returns the buffer containing this geometry in WKB format.
You may wish to use in conjunction with wkbSize().
Definition at line 605 of file qgsgeometry.cpp.
int QgsGeometry::avoidIntersections | ( | QMap< QgsVectorLayer *, QSet< QgsFeatureId > > | ignoreFeatures = ( QMap<QgsVectorLayer*, QSet<QgsFeatureId> >() ) | ) |
Modifies geometry to avoid intersections with the layers specified in project properties.
ignoreFeatures | possibility to give a list of features where intersections should be ignored (not available in python bindings) |
Definition at line 6171 of file qgsgeometry.cpp.
QgsRectangle QgsGeometry::boundingBox | ( | ) |
Returns the bounding box of this feature.
Definition at line 3231 of file qgsgeometry.cpp.
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 5730 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::buffer | ( | double | distance, |
int | segments, | ||
int | endCapStyle, | ||
int | joinStyle, | ||
double | mitreLimit | ||
) |
Returns a buffer region around the geometry, with additional style options.
distance | buffer distance |
segments | For round joins, number of segments to approximate quarter-circle |
endCapStyle | Round (1) / Flat (2) / Square (3) end cap style |
joinStyle | Round (1) / Mitre (2) / Bevel (3) join style |
mitreLimit | Limit on the mitre ratio used for very sharp corners |
Definition at line 5745 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::centroid | ( | ) |
Returns the center of mass of a geometry.
Definition at line 5800 of file qgsgeometry.cpp.
double QgsGeometry::closestSegmentWithContext | ( | const QgsPoint & | point, |
QgsPoint & | minDistPoint, | ||
int & | afterVertex, | ||
double * | leftOf = 0 , |
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double | epsilon = DEFAULT_SEGMENT_EPSILON |
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) |
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 |
afterVertex | Receives index of the vertex after the closest segment. The vertex before the closest segment is always afterVertex - 1 |
leftOf | Out: Returns if the point lies on the left of right side of the segment ( < 0 means left, > 0 means right ) |
epsilon | epsilon for segment snapping |
Definition at line 2113 of file qgsgeometry.cpp.
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 712 of file qgsgeometry.cpp.
double QgsGeometry::closestVertexWithContext | ( | const QgsPoint & | point, |
int & | atVertex | ||
) |
Searches for 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 2063 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::combine | ( | QgsGeometry * | geometry | ) |
Returns a geometry representing all the points in this geometry and other (a union geometry operation).
Definition at line 5887 of file qgsgeometry.cpp.
bool QgsGeometry::contains | ( | const QgsPoint * | p | ) | const |
Test for containment of a point (uses GEOS)
Definition at line 3499 of file qgsgeometry.cpp.
bool QgsGeometry::contains | ( | const QgsGeometry * | geometry | ) | const |
Test for if geometry is contained in another (uses GEOS)
Definition at line 3560 of file qgsgeometry.cpp.
bool QgsGeometry::convertToMultiType | ( | ) |
Converts single type geometry into multitype geometry e.g.
a polygon into a multipolygon geometry with one polygon
Definition at line 4609 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::convertToType | ( | QGis::GeometryType | destType, |
bool | destMultipart = false |
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) |
try to convert the geometry to the requested type
destType | the geometry type to be converted to |
destMultipart | determines if the output geometry will be multipart or not |
Definition at line 4591 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::convexHull | ( | ) |
Returns the smallest convex polygon that contains all the points in the geometry.
Definition at line 5830 of file qgsgeometry.cpp.
bool QgsGeometry::crosses | ( | const QgsGeometry * | geometry | ) | const |
Test for if geometry crosses another (uses GEOS)
Definition at line 3590 of file qgsgeometry.cpp.
bool QgsGeometry::deletePart | ( | int | partNum | ) |
delete part identified by the part number
Definition at line 6082 of file qgsgeometry.cpp.
bool QgsGeometry::deleteRing | ( | int | ringNum, |
int | partNum = 0 |
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) |
delete a ring in polygon or multipolygon.
Ring 0 is outer ring and can't be deleted.
Definition at line 6033 of file qgsgeometry.cpp.
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 1481 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::difference | ( | QgsGeometry * | geometry | ) |
Returns a geometry representing the points making up this geometry that do not make up other.
Definition at line 5921 of file qgsgeometry.cpp.
bool QgsGeometry::disjoint | ( | const QgsGeometry * | geometry | ) | const |
Test for if geometry is disjoint of another (uses GEOS)
Definition at line 3565 of file qgsgeometry.cpp.
double QgsGeometry::distance | ( | QgsGeometry & | geom | ) |
Definition at line 5708 of file qgsgeometry.cpp.
bool QgsGeometry::equals | ( | const QgsGeometry * | geometry | ) | const |
Test for if geometry equals another (uses GEOS)
Definition at line 3570 of file qgsgeometry.cpp.
QString QgsGeometry::exportToGeoJSON | ( | const int & | precision = 17 | ) | const |
Exports the geometry to GeoJSON.
Definition at line 3809 of file qgsgeometry.cpp.
QString QgsGeometry::exportToWkt | ( | const int & | precision = 17 | ) | const |
Exports the geometry to WKT.
Definition at line 3595 of file qgsgeometry.cpp.
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 690 of file qgsgeometry.cpp.
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static |
construct geometry from a multipoint
Definition at line 433 of file qgsgeometry.cpp.
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static |
construct geometry from a multipolygon
Definition at line 477 of file qgsgeometry.cpp.
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static |
construct geometry from a multipolyline
Definition at line 455 of file qgsgeometry.cpp.
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static |
construct geometry from a point
Definition at line 418 of file qgsgeometry.cpp.
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construct geometry from a polygon
Definition at line 428 of file qgsgeometry.cpp.
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construct geometry from a polyline
Definition at line 423 of file qgsgeometry.cpp.
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Construct geometry from a QPointF.
point | source QPointF |
Definition at line 517 of file qgsgeometry.cpp.
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Construct geometry from a QPolygonF.
If the polygon is closed than the resultant geometry will be a polygon, if it is open than the geometry will be a polyline.
polygon | source QPolygonF |
Definition at line 522 of file qgsgeometry.cpp.
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static |
construct geometry from a rectangle
Definition at line 502 of file qgsgeometry.cpp.
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 583 of file qgsgeometry.cpp.
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static |
static method that creates geometry from Wkt
Definition at line 402 of file qgsgeometry.cpp.
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return GEOS context handle
Definition at line 140 of file qgsgeometry.cpp.
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 1724 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::interpolate | ( | double | distance | ) |
Definition at line 5845 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::intersection | ( | QgsGeometry * | geometry | ) |
Returns a geometry representing the points shared by this geometry and other.
Definition at line 5866 of file qgsgeometry.cpp.
bool QgsGeometry::intersects | ( | const QgsRectangle & | r | ) | const |
Test for intersection with a rectangle (uses GEOS)
Definition at line 3469 of file qgsgeometry.cpp.
bool QgsGeometry::intersects | ( | const QgsGeometry * | geometry | ) | const |
Test for intersection with a geometry (uses GEOS)
Definition at line 3477 of file qgsgeometry.cpp.
bool QgsGeometry::isGeosEmpty | ( | ) |
check if geometry is empty using GEOS
Definition at line 6279 of file qgsgeometry.cpp.
bool QgsGeometry::isGeosEqual | ( | QgsGeometry & | g | ) |
compare geometries using GEOS
Definition at line 6274 of file qgsgeometry.cpp.
bool QgsGeometry::isGeosValid | ( | ) |
check validity using GEOS
Definition at line 6256 of file qgsgeometry.cpp.
bool QgsGeometry::isMultipart | ( | ) | const |
Returns true if wkb of the geometry is of WKBMulti* type.
Definition at line 682 of file qgsgeometry.cpp.
double QgsGeometry::length | ( | ) |
get length of geometry using GEOS
Definition at line 5689 of file qgsgeometry.cpp.
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 3173 of file qgsgeometry.cpp.
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 1244 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::offsetCurve | ( | double | distance, |
int | segments, | ||
int | joinStyle, | ||
double | mitreLimit | ||
) |
Returns an offset line at a given distance and side from an input line.
See buffer() method for details on parameters.
Definition at line 5765 of file qgsgeometry.cpp.
QgsGeometry & QgsGeometry::operator= | ( | QgsGeometry const & | rhs | ) |
assignments will prompt a deep copy of the object
Definition at line 552 of file qgsgeometry.cpp.
bool QgsGeometry::overlaps | ( | const QgsGeometry * | geometry | ) | const |
Test for if geometry overlaps another (uses GEOS)
Definition at line 3580 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::pointOnSurface | ( | ) |
Returns a point within a geometry.
Definition at line 5815 of file qgsgeometry.cpp.
int QgsGeometry::reshapeGeometry | ( | const QList< QgsPoint > & | reshapeWithLine | ) |
Replaces a part of this geometry with another line.
Definition at line 3066 of file qgsgeometry.cpp.
int QgsGeometry::rotate | ( | double | rotation, |
const QgsPoint & | center | ||
) |
Rotate this geometry around the Z axis.
rotation | clockwise rotation in degrees |
center | rotation center |
Definition at line 2858 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::simplify | ( | double | tolerance | ) |
Returns a simplified version of this geometry using a specified tolerance value.
Definition at line 5785 of file qgsgeometry.cpp.
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 2986 of file qgsgeometry.cpp.
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 2047 of file qgsgeometry.cpp.
QgsGeometry * QgsGeometry::symDifference | ( | QgsGeometry * | geometry | ) |
Returns a Geometry representing the points making up this Geometry that do not make up other.
Definition at line 5942 of file qgsgeometry.cpp.
bool QgsGeometry::touches | ( | const QgsGeometry * | geometry | ) | const |
Test for if geometry touch another (uses GEOS)
Definition at line 3575 of file qgsgeometry.cpp.
int QgsGeometry::transform | ( | const QgsCoordinateTransform & | ct | ) |
Transform this geometry as described by CoordinateTranasform ct.
Definition at line 2866 of file qgsgeometry.cpp.
int QgsGeometry::transform | ( | const QTransform & | ct | ) |
Transform this geometry as described by QTransform ct.
Definition at line 2733 of file qgsgeometry.cpp.
int QgsGeometry::translate | ( | double | dx, |
double | dy | ||
) |
Translate this geometry by dx, dy.
Definition at line 2853 of file qgsgeometry.cpp.
QGis::GeometryType QgsGeometry::type | ( | ) | const |
Returns type of the vector.
Definition at line 652 of file qgsgeometry.cpp.
|
static |
compute the unary union on a list of geometries.
May be faster than an iterative union on a set of geometries.
geometryList | a list of QgsGeometry* as input |
Definition at line 6623 of file qgsgeometry.cpp.
void QgsGeometry::validateGeometry | ( | QList< Error > & | errors | ) |
Validate geometry and produce a list of geometry errors.
Definition at line 6251 of file qgsgeometry.cpp.
QgsPoint QgsGeometry::vertexAt | ( | int | atVertex | ) |
Returns coordinates of a vertex.
atVertex | index of the vertex |
Definition at line 1869 of file qgsgeometry.cpp.
bool QgsGeometry::within | ( | const QgsGeometry * | geometry | ) | const |
Test for if geometry is within another (uses GEOS)
Definition at line 3585 of file qgsgeometry.cpp.
size_t QgsGeometry::wkbSize | ( | ) | const |
Returns the size of the WKB in asWkb().
Definition at line 613 of file qgsgeometry.cpp.
QGis::WkbType QgsGeometry::wkbType | ( | ) | const |
Returns type of wkb (point / linestring / polygon etc.)
Definition at line 635 of file qgsgeometry.cpp.