55 QList<QgsVectorLayer *>
layers()
const {
return mLayers; }
57 void setLayers(
const QList<QgsVectorLayer *> &layers );
86 double offset()
const {
return mOffset; }
92 void setOffset(
double offset );
99 void offsetParameters(
int &quadSegments
SIP_OUT,
int &joinStyle
SIP_OUT,
double &miterLimit
SIP_OUT );
106 void setOffsetParameters(
int quadSegments,
int joinStyle,
double miterLimit );
161 void invalidateGraph();
170 void onAttributeValueChanged(
QgsFeatureId fid,
int idx,
const QVariant &value );
171 void onDataChanged( );
172 void onStyleChanged( );
173 void onLayerDestroyed( QObject *obj );
177 std::unique_ptr< QgsTracerGraph > mGraph;
179 QList<QgsVectorLayer *> mLayers;
185 std::unique_ptr<QgsRenderContext> mRenderContext;
192 int mOffsetSegments = 8;
196 double mOffsetMiterLimit = 5.;
202 int mMaxFeatureCount = 0;
208 bool mHasTopologyProblem =
false;
JoinStyle
Join styles for buffers.
@ Miter
Use mitered joins.
This class represents a coordinate reference system (CRS).
Contains information about the context in which a coordinate transform is executed.
Abstract base class for all 2D vector feature renderers.
A geometry is the spatial representation of a feature.
A class to represent a 2D point.
A rectangle specified with double values.
Contains information about the context of a rendering operation.
Utility class that construct a planar graph from the input vector layers and provides shortest path s...
void setMaxFeatureCount(int count)
Gets maximum possible number of features in graph. If the number is exceeded, graph is not created.
bool hasTopologyProblem() const
Whether there was an error during graph creation due to noding exception, indicating some input data ...
PathError
Possible errors that may happen when calling findShortestPath()
@ ErrNoPath
Points are not connected in the graph.
@ ErrPoint2
End point cannot be joined to the graph.
@ ErrPoint1
Start point cannot be joined to the graph.
@ ErrTooManyFeatures
Max feature count threshold was reached while reading features.
QgsTracer()
Constructor for QgsTracer.
QgsRectangle extent() const
Gets extent to which graph's features will be limited (empty extent means no limit)
int maxFeatureCount() const
Gets maximum possible number of features in graph. If the number is exceeded, graph is not created.
double offset() const
Gets offset in map units that should be applied to the traced paths returned from findShortestPath().
QgsCoordinateReferenceSystem destinationCrs() const
Returns the CRS used for tracing.
QList< QgsVectorLayer * > layers() const
Gets layers used for tracing.
virtual void configure()
Allows derived classes to setup the settings just before the tracer is initialized.
bool isInitialized() const
Whether the internal data structures have been initialized.
Represents a vector layer which manages a vector based data sets.
qint64 QgsFeatureId
64 bit feature ids negative numbers are used for uncommitted/newly added features
const QgsCoordinateReferenceSystem & crs
Simple graph structure for shortest path search.