Subgroup: Graph
Class: QgsGraphBuilderInterface¶
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class
qgis.analysis.
QgsGraphBuilderInterface
(crs: QgsCoordinateReferenceSystem, ctfEnabled: bool = True, topologyTolerance: float = 0, ellipsoidID: str = '')¶ Bases:
sip.wrapper
Default constructor
Parameters: - crs – Coordinate reference system for new graph vertex
- ctfEnabled – enable coordinate transform from source graph CRS to CRS graph
- topologyTolerance – sqrt distance between source point as one graph vertex
- ellipsoidID – ellipsoid for edge measurement
QgsGraphBuilderInterface(QgsGraphBuilderInterface)
Determine interface for creating a graph. Contains the settings of the graph. QgsGraphBuilder and QgsGraphDirector both use a “builder” design pattern
Methods
addEdge
Add edge to the graph addVertex
Add vertex to the graph coordinateTransformationEnabled
Returns coordinate transformation enabled destinationCrs
Returns destinaltion CRS distanceArea
Returns measurement tool topologyTolerance
Returns topology tolerance Signals
Attributes
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addEdge
(self, pt1id: int, pt1: QgsPointXY, pt2id: int, pt2: QgsPointXY, strategies: Iterable[Any])¶ Add edge to the graph
Parameters: - pt1id – first vertex identificator
- pt1 – first vertex coordinates
- pt2id – second vertex identificator
- pt2 – second vertex coordinates
- strategies – optimization strategies
Note
pt1id, pt1 and pt2id, pt2 is a redundant interface. You can use vertex coordinates or their identificators.
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addVertex
(self, id: int, pt: QgsPointXY)¶ Add vertex to the graph
Parameters: - id – vertex identifier
- pt – vertex coordinates
Note
id and pt are redundant. You can use pt or id to identify the vertex
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coordinateTransformationEnabled
(self) → bool¶ Returns coordinate transformation enabled
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destinationCrs
(self) → QgsCoordinateReferenceSystem¶ Returns destinaltion CRS
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distanceArea
(self) → QgsDistanceArea¶ Returns measurement tool
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topologyTolerance
(self) → float¶ Returns topology tolerance