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QGIS/python/core/geometry/qgsgeometry.sip
Nyall Dawson 986b5313ed Add QgsGeometry method to get bisector of angle at vertex 
Sponsored by Andreas Neumann
2016-08-29 11:01:52 +10:00

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/** Polyline is represented as a vector of points */
typedef QVector<QgsPoint> QgsPolyline;
/** Polygon: first item of the list is outer ring, inner rings (if any) start from second item */
typedef QVector< QVector<QgsPoint> > QgsPolygon;
/** A collection of QgsPoints that share a common collection of attributes */
typedef QVector<QgsPoint> QgsMultiPoint;
/** A collection of QgsPolylines that share a common collection of attributes */
typedef QVector< QVector<QgsPoint> > QgsMultiPolyline;
/** A collection of QgsPolygons that share a common collection of attributes */
typedef QVector< QVector< QVector<QgsPoint> > > QgsMultiPolygon;
/** \ingroup core
* A geometry is the spatial representation of a feature. Since QGIS 2.10, QgsGeometry acts as a generic container
* for geometry objects. QgsGeometry is implicitly shared, so making copies of geometries is inexpensive. The geometry
* container class can also be stored inside a QVariant object.
*
* The actual geometry representation is stored as a @link QgsAbstractGeometry @endlink within the container, and
* can be accessed via the @link geometry @endlink method or set using the @link setGeometry @endlink method.
*/
class QgsGeometry
{
%TypeHeaderCode
#include <qgsgeometry.h>
%End
public:
//! Constructor
QgsGeometry();
/** Copy constructor will prompt a deep copy of the object */
QgsGeometry( const QgsGeometry & );
/** Creates a geometry from an abstract geometry object. Ownership of
* geom is transferred.
* @note added in QGIS 2.10
*/
explicit QgsGeometry( QgsAbstractGeometry* geom /Transfer/ );
//! Destructor
~QgsGeometry();
/** Returns the underlying geometry store.
* @note added in QGIS 2.10
* @see setGeometry
*/
QgsAbstractGeometry* geometry() const;
/** Sets the underlying geometry store. Ownership of geometry is transferred.
* @note added in QGIS 2.10
* @see geometry
*/
void setGeometry( QgsAbstractGeometry* geometry /Transfer/ );
/** Returns true if the geometry is empty (ie, contains no underlying geometry
* accessible via @link geometry @endlink).
* @see geometry
* @note added in QGIS 2.10
*/
bool isEmpty() const;
/** Creates a new geometry from a WKT string */
static QgsGeometry fromWkt( const QString& wkt );
/** Creates a new geometry from a QgsPoint object*/
static QgsGeometry fromPoint( const QgsPoint& point );
/** Creates a new geometry from a QgsMultiPoint object */
static QgsGeometry fromMultiPoint( const QgsMultiPoint& multipoint );
/** Creates a new geometry from a QgsPolyline object */
static QgsGeometry fromPolyline( const QgsPolyline& polyline );
/** Creates a new geometry from a QgsMultiPolyline object*/
static QgsGeometry fromMultiPolyline( const QgsMultiPolyline& multiline );
/** Creates a new geometry from a QgsPolygon */
static QgsGeometry fromPolygon( const QgsPolygon& polygon );
/** Creates a new geometry from a QgsMultiPolygon */
static QgsGeometry fromMultiPolygon( const QgsMultiPolygon& multipoly );
/** Creates a new geometry from a QgsRectangle */
static QgsGeometry fromRect( const QgsRectangle& rect );
/** Creates a new multipart geometry from a list of QgsGeometry objects*/
static QgsGeometry collectGeometry( const QList< QgsGeometry >& geometries );
/**
* Set the geometry, feeding in a geometry in GEOS format.
* This class will take ownership of the buffer.
* @note not available in python bindings
*/
// void fromGeos( GEOSGeometry* geos );
/**
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.
*/
void fromWkb( unsigned char * wkb /Array/, int length /ArraySize/ );
%MethodCode
// create copy of Python's string and pass it to fromWkb()
unsigned char * copy = new unsigned char[a1];
memcpy(copy, a0, a1);
sipCpp->fromWkb(copy, a1);
%End
/**
Returns the buffer containing this geometry in WKB format.
You may wish to use in conjunction with wkbSize().
@see wkbSize
*/
SIP_PYOBJECT asWkb();
%MethodCode
sipRes = PyBytes_FromStringAndSize((const char *)sipCpp->asWkb(), sipCpp->wkbSize());
%End
/**
* Returns the size of the WKB in asWkb().
* @see asWkb
*/
int wkbSize() const;
/** Returns a geos geometry. QgsGeometry retains ownership of the geometry, so the returned object should not be deleted.
* @param precision The precision of the grid to which to snap the geometry vertices. If 0, no snapping is performed.
* @note this method was added in version 1.1
* @note not available in python bindings
*/
// const GEOSGeometry* asGeos( double precision = 0 ) const;
/** Returns type of the geometry as a WKB type (point / linestring / polygon etc.)
* @see type
*/
QgsWkbTypes::Type wkbType() const;
/** Returns type of the geometry as a QgsWkbTypes::GeometryType
* @see wkbType
*/
QgsWkbTypes::GeometryType type() const;
/** Returns true if WKB of the geometry is of WKBMulti* type */
bool isMultipart() const;
/** Compares the geometry with another geometry using GEOS
@note added in 1.5
*/
bool isGeosEqual( const QgsGeometry& ) const;
/** Checks validity of the geometry using GEOS
@note added in 1.5
*/
bool isGeosValid() const;
/** Check if the geometry is empty using GEOS
@note added in 1.5
*/
bool isGeosEmpty() const;
/** Returns the area of the geometry using GEOS
@note added in 1.5
*/
double area() const;
/** Returns the length of geometry using GEOS
@note added in 1.5
*/
double length() const;
/**
* Returns the minimum distance between this geometry and another geometry, using GEOS.
* Will return a negative value if a geometry is missing.
*
* @param geom geometry to find minimum distance to
*/
double distance( const QgsGeometry& geom ) const;
/**
* 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 and after the closest vertex.
* @param point point to search for
* @param atVertex will be set to the vertex index of the closest found vertex
* @param beforeVertex will be set to the vertex index of the previous vertex from the closest one. Will be set to -1 if
* not present.
* @param afterVertex will be set to the vertex index of the next vertex after the closest one. Will be set to -1 if
* not present.
* @param sqrDist will be set to the square distance between the closest vertex and the specified point
* @returns closest point in geometry
*/
//TODO QGIS 3.0 - rename beforeVertex to previousVertex, afterVertex to nextVertex
QgsPoint closestVertex( const QgsPoint& point, int& atVertex /Out/, int& beforeVertex /Out/, int& afterVertex /Out/, double& sqrDist /Out/ ) const;
/**
* Returns the distance along this geometry from its first vertex to the specified vertex.
* @param vertex vertex index to calculate distance to
* @returns distance to vertex (following geometry), or -1 for invalid vertex numbers
* @note added in QGIS 2.16
*/
double distanceToVertex( int vertex ) const;
/**
* Returns the bisector angle for this geometry at the specified vertex.
* @param vertex vertex index to calculate bisector angle at
* @returns bisector angle, in radians clockwise from north
* @note added in QGIS 3.0
* @see interpolateAngle()
*/
double angleAtVertex( int vertex ) const;
/**
* 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).
*/
void adjacentVertices( int atVertex, int& beforeVertex /Out/, int& afterVertex /Out/ ) const;
/** 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?)
*/
bool insertVertex( double x, double y, int beforeVertex );
/** 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
*/
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.
// * Returns false if atVertex does not correspond to a valid vertex
* on this geometry
*/
bool moveVertex( const QgsPointV2& p, 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?)
*/
bool deleteVertex( int atVertex );
/**
* Returns coordinates of a vertex.
* @param atVertex index of the vertex
* @return Coordinates of the vertex or QgsPoint(0,0) on error
*/
QgsPoint vertexAt( int atVertex ) const;
/**
* 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 sqrDistToVertexAt( QgsPoint& point /In/, int atVertex ) const;
/** Returns the nearest point on this geometry to another geometry.
* @note added in QGIS 2.14
* @see shortestLine()
*/
QgsGeometry nearestPoint( const QgsGeometry& other ) const;
/** Returns the shortest line joining this geometry to another geometry.
* @note added in QGIS 2.14
* @see nearestPoint()
*/
QgsGeometry shortestLine( const QgsGeometry& other ) const;
/**
* Searches for the closest vertex in this geometry to the given point.
* @param point Specifiest the point for search
* @param atVertex Receives index of the closest vertex
* @return The squared cartesian distance is also returned in sqrDist, negative number on error
*/
double closestVertexWithContext( const QgsPoint& point, int& atVertex /Out/ ) const;
/**
* Searches for the closest segment of geometry to the given point
* @param point Specifies the point for search
* @param minDistPoint Receives the nearest point on the segment
* @param afterVertex Receives index of the vertex after the closest segment. The vertex
* before the closest segment is always afterVertex - 1
* @param leftOf Out: Returns if the point lies on the left of right side of the segment ( < 0 means left, > 0 means right )
* @param epsilon epsilon for segment snapping (added in 1.8)
* @return The squared cartesian distance is also returned in sqrDist, negative number on error
*/
double closestSegmentWithContext( const QgsPoint& point, QgsPoint& minDistPoint /Out/, int& afterVertex /Out/ ) const;
/** Adds a new ring to this geometry. This makes only sense for polygon and multipolygons.
@return 0 in case of success (ring added), 1 problem with geometry type, 2 ring not closed,
3 ring is not valid geometry, 4 ring not disjoint with existing rings, 5 no polygon found which contained the ring*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
int addRing( const QList<QgsPoint>& ring );
/** Adds a new ring to this geometry. This makes only sense for polygon and multipolygons.
@return 0 in case of success (ring added), 1 problem with geometry type, 2 ring not closed,
3 ring is not valid geometry, 4 ring not disjoint with existing rings, 5 no polygon found which contained the ring*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
int addRing( QgsCurve* ring );
/** Adds a new part to a the geometry.
* @param points points describing part to add
* @param geomType default geometry type to create if no existing geometry
* @returns 0 in case of success, 1 if not a multipolygon, 2 if ring is not a valid geometry, 3 if new polygon ring
* not disjoint with existing polygons of the feature
*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
%If (!QT5_SUPPORT)
int addPart( const QList<QgsPoint> &points, QgsWkbTypes::GeometryType geomType = QgsWkbTypes::UnknownGeometry );
%End
int addPart( const QList<QgsPoint> &points, QgsWkbTypes::GeometryType geomType = QgsWkbTypes::UnknownGeometry )/PyName=addPoints/;
/** Adds a new part to a the geometry.
* @param points points describing part to add
* @param geomType default geometry type to create if no existing geometry
* @returns 0 in case of success, 1 if not a multipolygon, 2 if ring is not a valid geometry, 3 if new polygon ring
* not disjoint with existing polygons of the feature
*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
%If (!QT5_SUPPORT)
int addPart( const QList<QgsPointV2> &points, QgsWkbTypes::GeometryType geomType = QgsWkbTypes::UnknownGeometry );
%End
int addPart( const QList<QgsPointV2> &points, QgsWkbTypes::GeometryType geomType = QgsWkbTypes::UnknownGeometry )/PyName=addPointsV2/;
/** Adds a new part to this geometry.
* @param part part to add (ownership is transferred)
* @param geomType default geometry type to create if no existing geometry
* @returns 0 in case of success, 1 if not a multipolygon, 2 if ring is not a valid geometry, 3 if new polygon ring
* not disjoint with existing polygons of the feature
*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
int addPart( QgsAbstractGeometry* part /Transfer/, QgsWkbTypes::GeometryType geomType = QgsWkbTypes::UnknownGeometry );
/** Adds a new island polygon to a multipolygon feature
* @param newPart part to add. Ownership is NOT transferred.
* @return 0 in case of success, 1 if not a multipolygon, 2 if ring is not a valid geometry, 3 if new polygon ring
* not disjoint with existing polygons of the feature
* @note not available in python bindings
*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
// int addPart( GEOSGeometry *newPart );
/** Adds a new island polygon to a multipolygon feature
@return 0 in case of success, 1 if not a multipolygon, 2 if ring is not a valid geometry, 3 if new polygon ring
not disjoint with existing polygons of the feature
@note available in python bindings as addPartGeometry (added in 2.2)
*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
int addPart( const QgsGeometry *newPart /Transfer/ ) /PyName=addPartGeometry/;
/** Translate this geometry by dx, dy
@return 0 in case of success*/
int translate( double dx, double dy );
/** Transform this geometry as described by CoordinateTransform ct
@return 0 in case of success*/
int transform( const QgsCoordinateTransform& ct );
/** Transform this geometry as described by QTransform ct
@note added in 2.8
@return 0 in case of success*/
int transform( const QTransform& ct );
/** Rotate this geometry around the Z axis
@note added in 2.8
@param rotation clockwise rotation in degrees
@param center rotation center
@return 0 in case of success*/
int rotate( double rotation, const QgsPoint& center );
/** Splits this geometry according to a given line.
@param splitLine the line that splits the geometry
@param[out] newGeometries list of new geometries that have been created with the split
@param topological true if topological editing is enabled
@param[out] topologyTestPoints points that need to be tested for topological completeness in the dataset
@return 0 in case of success, 1 if geometry has not been split, error else*/
// TODO QGIS 3.0 returns an enum instead of a magic constant
int splitGeometry( const QList<QgsPoint>& splitLine,
QList<QgsGeometry*>&newGeometries /Out/,
bool topological,
QList<QgsPoint> &topologyTestPoints /Out/);
/** Replaces a part of this geometry with another line
* @return 0 in case of success
* @note: this function was added in version 1.3
*/
int reshapeGeometry( const QList<QgsPoint>& reshapeWithLine );
/** Changes this geometry such that it does not intersect the other geometry
* @param other geometry that should not be intersect
* @return 0 in case of success
*/
int makeDifference( const QgsGeometry* other );
/** Returns the geometry formed by modifying this geometry such that it does not
* intersect the other geometry.
* @param other geometry that should not be intersect
* @return difference geometry, or empty geometry if difference could not be calculated
* @note added in QGIS 3.0
*/
QgsGeometry makeDifference( const QgsGeometry& other ) const;
/** Returns the bounding box of this feature*/
QgsRectangle boundingBox() const;
/** Test for intersection with a rectangle (uses GEOS) */
bool intersects( const QgsRectangle& r ) const;
/** Test for intersection with a geometry (uses GEOS) */
bool intersects( const QgsGeometry& geometry ) const;
/** Test for containment of a point (uses GEOS) */
bool contains( const QgsPoint* p ) const;
/** Test for if geometry is contained in another (uses GEOS)
* @note added in 1.5 */
bool contains( const QgsGeometry& geometry ) const;
/** Test for if geometry is disjoint of another (uses GEOS)
* @note added in 1.5 */
bool disjoint( const QgsGeometry& geometry ) const;
/** Test for if geometry equals another (uses GEOS)
* @note added in 1.5 */
bool equals( const QgsGeometry& geometry ) const;
/** Test for if geometry touch another (uses GEOS)
* @note added in 1.5 */
bool touches( const QgsGeometry& geometry ) const;
/** Test for if geometry overlaps another (uses GEOS)
* @note added in 1.5 */
bool overlaps( const QgsGeometry& geometry ) const;
/** Test for if geometry is within another (uses GEOS)
* @note added in 1.5 */
bool within( const QgsGeometry& geometry ) const;
/** Test for if geometry crosses another (uses GEOS)
* @note added in 1.5 */
bool crosses( const QgsGeometry& geometry ) const;
//! Side of line to buffer
enum BufferSide
{
SideLeft, //!< Buffer to left of line
SideRight, //!< Buffer to right of line
};
//! End cap styles for buffers
enum EndCapStyle
{
CapRound, //!< Round cap
CapFlat, //!< Flat cap (in line with start/end of line)
CapSquare, //!< Square cap (extends past start/end of line by buffer distance)
};
//! Join styles for buffers
enum JoinStyle
{
JoinStyleRound, //!< Use rounded joins
JoinStyleMitre, //!< Use mitred joins
JoinStyleBevel, //!< Use beveled joins
};
/** 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 ) const;
/** Returns a buffer region around the geometry, with additional style options.
* @param distance buffer distance
* @param segments for round joins, number of segments to approximate quarter-circle
* @param endCapStyle end cap style
* @param joinStyle join style for corners in geometry
* @param mitreLimit limit on the mitre ratio used for very sharp corners (JoinStyleMitre only)
* @note added in 2.4
*/
QgsGeometry buffer( double distance, int segments, EndCapStyle endCapStyle, JoinStyle joinStyle, double mitreLimit ) const;
/** Returns an offset line at a given distance and side from an input line.
* @param distance buffer distance
* @param segments for round joins, number of segments to approximate quarter-circle
* @param joinStyle join style for corners in geometry
* @param mitreLimit limit on the mitre ratio used for very sharp corners (JoinStyleMitre only)
* @note added in 2.4
*/
QgsGeometry offsetCurve( double distance, int segments, JoinStyle joinStyle, double mitreLimit ) const;
/**
* Returns a single sided buffer for a (multi)line geometry. The buffer is only
* applied to one side of the line.
* @param distance buffer distance
* @param segments for round joins, number of segments to approximate quarter-circle
* @param side side of geometry to buffer
* @param joinStyle join style for corners
* @param mitreLimit limit on the mitre ratio used for very sharp corners
* @return buffered geometry, or an empty geometry if buffer could not be
* calculated
* @note added in QGIS 3.0
*/
QgsGeometry singleSidedBuffer( double distance, int segments, BufferSide side,
JoinStyle joinStyle = JoinStyleRound,
double mitreLimit = 2.0 ) const;
/** Returns a simplified version of this geometry using a specified tolerance value */
QgsGeometry simplify( double tolerance ) const;
/** Returns the center of mass of a geometry
* @note for line based geometries, the center point of the line is returned,
* and for point based geometries, the point itself is returned
*/
QgsGeometry centroid() const;
/** Returns a point within a geometry */
QgsGeometry pointOnSurface() const;
/** Returns the smallest convex polygon that contains all the points in the geometry. */
QgsGeometry convexHull() const;
/**
* Return interpolated point on line at distance
* @note added in 1.9
* @see lineLocatePoint()
*/
QgsGeometry interpolate( double distance ) const;
/** Returns a distance representing the location along this linestring of the closest point
* on this linestring geometry to the specified point. Ie, the returned value indicates
* how far along this linestring you need to traverse to get to the closest location
* where this linestring comes to the specified point.
* @param point point to seek proximity to
* @return distance along line, or -1 on error
* @note only valid for linestring geometries
* @see interpolate()
* @note added in QGIS 3.0
*/
double lineLocatePoint( const QgsGeometry& point ) const;
/** Returns the angle parallel to the linestring or polygon boundary at the specified distance
* along the geometry. Angles are in radians, clockwise from north.
* If the distance coincides precisely at a node then the average angle from the segment either side
* of the node is returned.
* @param distance distance along geometry
* @note added in QGIS 3.0
* @see angleAtVertex()
*/
double interpolateAngle( double distance ) const;
/** Returns a geometry representing the points shared by this geometry and other. */
QgsGeometry intersection( const QgsGeometry& geometry ) const;
/** Returns a geometry representing all the points in this geometry and other (a
* union geometry operation).
* @note this operation is not called union since its a reserved word in C++.
*/
QgsGeometry combine( const QgsGeometry& geometry ) const;
/** Merges any connected lines in a LineString/MultiLineString geometry and
* converts them to single line strings.
* @returns a LineString or MultiLineString geometry, with any connected lines
* joined. An empty geometry will be returned if the input geometry was not a
* MultiLineString geometry.
* @note added in QGIS 3.0
*/
QgsGeometry mergeLines() const;
/** Returns a geometry representing the points making up this geometry that do not make up other. */
QgsGeometry difference( const QgsGeometry& geometry ) const;
/** Returns a geometry representing the points making up this geometry that do not make up other. */
QgsGeometry symDifference( const QgsGeometry& geometry ) const;
/** Returns an extruded version of this geometry. */
QgsGeometry extrude( double x, double y );
/** Exports the geometry to WKT
* @note precision parameter added in 2.4
* @return true in case of success and false else
*/
QString exportToWkt( int precision = 17 ) const;
/** Exports the geometry to GeoJSON
* @return a QString representing the geometry as GeoJSON
* @note added in 1.8
* @note python binding added in 1.9
* @note precision parameter added in 2.4
*/
QString exportToGeoJSON( int precision = 17 ) const;
/** Try to convert the geometry to the requested type
* @param destType the geometry type to be converted to
* @param destMultipart determines if the output geometry will be multipart or not
* @return the converted geometry or nullptr if the conversion fails.
* @note added in 2.2
*/
QgsGeometry convertToType( QgsWkbTypes::GeometryType destType, bool destMultipart = false ) const /Factory/;
/* Accessor functions for getting geometry data */
/** Return contents of the geometry as a point
* if wkbType is WKBPoint, otherwise returns [0,0]
*/
QgsPoint asPoint() const;
/** Return contents of the geometry as a polyline
* if wkbType is WKBLineString, otherwise an empty list
*/
QgsPolyline asPolyline() const;
/** Return contents of the geometry as a polygon
* if wkbType is WKBPolygon, otherwise an empty list
*/
QgsPolygon asPolygon() const;
/** Return contents of the geometry as a multi point
if wkbType is WKBMultiPoint, otherwise an empty list */
QgsMultiPoint asMultiPoint() const;
/** Return contents of the geometry as a multi linestring
if wkbType is WKBMultiLineString, otherwise an empty list */
QgsMultiPolyline asMultiPolyline() const;
/** Return contents of the geometry as a multi polygon
if wkbType is WKBMultiPolygon, otherwise an empty list */
QgsMultiPolygon asMultiPolygon() const;
/** Return contents of the geometry as a list of geometries
@note added in version 1.1 */
QList<QgsGeometry> asGeometryCollection() const;
/** Return contents of the geometry as a QPointF if wkbType is WKBPoint,
* otherwise returns a null QPointF.
* @note added in QGIS 2.7
*/
QPointF asQPointF() 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.
* @note added in QGIS 2.7
*/
QPolygonF asQPolygonF() const;
/** Delete a ring in polygon or multipolygon.
Ring 0 is outer ring and can't be deleted.
@return true on success
@note added in version 1.2 */
bool deleteRing( int ringNum, int partNum = 0 );
/** Delete part identified by the part number
@return true on success
@note added in version 1.2 */
bool deletePart( int partNum );
/**
* Converts single type geometry into multitype geometry
* e.g. a polygon into a multipolygon geometry with one polygon
* If it is already a multipart geometry, it will return true and
* not change the geometry.
*
* @return true in case of success and false else
*/
bool convertToMultiType();
/**
* Converts multi type geometry into single type geometry
* e.g. a multipolygon into a polygon geometry. Only the first part of the
* multi geometry will be retained.
* If it is already a single part geometry, it will return true and
* not change the geometry.
*
* @return true in case of success and false else
*/
bool convertToSingleType();
/** Modifies geometry to avoid intersections with the layers specified in project properties
* @return 0 in case of success,
* 1 if geometry is not of polygon type,
* 2 if avoid intersection would change the geometry type,
* 3 other error during intersection removal
* @param ignoreFeatures possibility to give a list of features where intersections should be ignored (not available in python bindings)
* @note added in 1.5
*/
int avoidIntersections();
class Error
{
public:
Error();
Error( const QString& m );
Error( const QString& m, const QgsPoint& p );
QString what();
QgsPoint where();
bool hasWhere();
};
/** Validate geometry and produce a list of geometry errors
* @note added in 1.5
* @note python binding added in 1.6
**/
void validateGeometry( QList<QgsGeometry::Error> &errors /Out/ );
/** Compute the unary union on a list of geometries. May be faster than an iterative union on a set of geometries.
* @param geometryList a list of QgsGeometry* as input
* @returns the new computed QgsGeometry, or null
*/
static QgsGeometry unaryUnion( const QList<QgsGeometry>& geometryList );
/** Converts the geometry to straight line segments, if it is a curved geometry type.
* @note added in QGIS 2.10
* @see requiresConversionToStraightSegments
*/
void convertToStraightSegment();
/** Returns true if the geometry is a curved geometry type which requires conversion to
* display as straight line segments.
* @note added in QGIS 2.10
* @see convertToStraightSegment
*/
bool requiresConversionToStraightSegments() const;
/** Transforms the geometry from map units to pixels in place.
* @param mtp map to pixel transform
* @note added in QGIS 2.10
*/
void mapToPixel( const QgsMapToPixel& mtp );
// not implemented for 2.10
/* Clips the geometry using the specified rectangle
* @param rect clip rectangle
* @note added in QGIS 2.10
*/
// void clip( const QgsRectangle& rect );
/** Draws the geometry onto a QPainter
* @param p destination QPainter
* @note added in QGIS 2.10
*/
void draw( QPainter& p ) const;
/** Calculates the vertex ID from a vertex number
* @param nr vertex number
* @param id reference to QgsVertexId for storing result
* @returns true if vertex was found
* @note added in QGIS 2.10
* @see vertexNrFromVertexId
*/
bool vertexIdFromVertexNr( int nr, QgsVertexId& id ) const;
/** Returns the vertex number corresponding to a vertex idd
* @param i vertex id
* @returns vertex number
* @note added in QGIS 2.10
* @see vertexIdFromVertexNr
*/
int vertexNrFromVertexId( QgsVertexId i ) const;
/** Return GEOS context handle
* @note added in 2.6
* @note not available in Python
*/
// static GEOSContextHandle_t getGEOSHandler();
/** Construct geometry from a QPointF
* @param point source QPointF
* @note added in QGIS 2.7
*/
static QgsGeometry fromQPointF( QPointF point );
/** 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.
* @param polygon source QPolygonF
* @note added in QGIS 2.7
*/
static QgsGeometry fromQPolygonF( const QPolygonF& polygon );
/** Creates a QgsPolyline from a QPolygonF.
* @param polygon source polygon
* @returns QgsPolyline
* @see createPolygonFromQPolygonF
*/
static QgsPolyline createPolylineFromQPolygonF( const QPolygonF &polygon ) /Factory/;
/** Creates a QgsPolygon from a QPolygonF.
* @param polygon source polygon
* @returns QgsPolygon
* @see createPolylineFromQPolygonF
*/
static QgsPolygon createPolygonFromQPolygonF( const QPolygonF &polygon ) /Factory/;
/** Compares two polylines for equality within a specified tolerance.
* @param p1 first polyline
* @param p2 second polyline
* @param epsilon maximum difference for coordinates between the polylines
* @returns true if polylines have the same number of points and all
* points are equal within the specified tolerance
* @note added in QGIS 2.9
*/
static bool compare( const QgsPolyline& p1, const QgsPolyline& p2, double epsilon = 4 * DBL_EPSILON );
static bool compare( const QgsPolyline& p1, const QgsPolyline& p2, double epsilon = 4 * DBL_EPSILON )/PyName=comparePolylines/;
/** Compares two polygons for equality within a specified tolerance.
* @param p1 first polygon
* @param p2 second polygon
* @param epsilon maximum difference for coordinates between the polygons
* @returns true if polygons have the same number of rings, and each ring has the same
* number of points and all points are equal within the specified tolerance
* @note added in QGIS 2.9
*/
static bool compare( const QgsPolygon& p1, const QgsPolygon& p2, double epsilon = 4 * DBL_EPSILON );
static bool compare( const QgsPolygon& p1, const QgsPolygon& p2, double epsilon = 4 * DBL_EPSILON )/PyName=comparePolygons/;
/** Compares two multipolygons for equality within a specified tolerance.
* @param p1 first multipolygon
* @param p2 second multipolygon
* @param epsilon maximum difference for coordinates between the multipolygons
* @returns true if multipolygons have the same number of polygons, the polygons have the same number
* of rings, and each ring has the same number of points and all points are equal within the specified
* tolerance
* @note added in QGIS 2.9
*/
static bool compare( const QgsMultiPolygon& p1, const QgsMultiPolygon& p2, double epsilon = 4 * DBL_EPSILON );
static bool compare( const QgsMultiPolygon& p1, const QgsMultiPolygon& p2, double epsilon = 4 * DBL_EPSILON )/PyName=compareMultiPolygons/;
/** Smooths a geometry by rounding off corners using the Chaikin algorithm. This operation
* roughly doubles the number of vertices in a geometry.
* @param iterations number of smoothing iterations to run. More iterations results
* in a smoother geometry
* @param offset fraction of line to create new vertices along, between 0 and 1.0
* eg the default value of 0.25 will create new vertices 25% and 75% along each line segment
* of the geometry for each iteration. Smaller values result in "tighter" smoothing.
* @note added in 2.9
*/
QgsGeometry smooth( const unsigned int iterations, const double offset ) const;
/** Smooths a polygon using the Chaikin algorithm*/
QgsPolygon smoothPolygon( const QgsPolygon &polygon, const unsigned int iterations = 1, const double offset = 0.25 ) const;
/** Smooths a polyline using the Chaikin algorithm*/
QgsPolyline smoothLine( const QgsPolyline &polyline, const unsigned int iterations = 1, const double offset = 0.25 ) const;
/** Creates and returns a new geometry engine
*/
static QgsGeometryEngine* createGeometryEngine( const QgsAbstractGeometry* geometry ) /Factory/;
/** Upgrades a point list from QgsPoint to QgsPointV2
* @param input list of QgsPoint objects to be upgraded
* @param output destination for list of points converted to QgsPointV2
*/
static void convertPointList( const QList<QgsPoint>& input, QList<QgsPointV2>& output );
/** Downgrades a point list from QgsPointV2 to QgsPoint
* @param input list of QgsPointV2 objects to be downgraded
* @param output destination for list of points converted to QgsPoint
*/
static void convertPointList( const QList<QgsPointV2>& input, QList<QgsPoint>& output );
//! Allows direct construction of QVariants from geometry.
operator QVariant() const;
/** Returns true if the geometry is non empty (ie, isEmpty() returns false),
* or false if it is an empty, uninitialised geometry (ie, ieEmpty() returns true).
* @note added in QGIS 3.0
*/
operator bool() const;
}; // class QgsGeometry
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