QGIS API Documentation 3.41.0-Master (fda2aa46e9a)
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Interface for Triangulation classes. More...
#include <qgstriangulation.h>
Public Types | |
enum | ForcedCrossBehavior { SnappingTypeVertex , DeleteFirst , InsertVertex } |
Enumeration describing the behavior, if two forced lines cross. More... | |
Public Member Functions | |
virtual | ~QgsTriangulation ()=default |
virtual void | addLine (const QgsPointSequence &points, QgsInterpolator::SourceType lineType)=0 |
Adds a line (e.g. | |
virtual int | addPoint (const QgsPoint &point)=0 |
Adds a point to the triangulation. | |
virtual bool | calcNormal (double x, double y, QgsPoint &result)=0 |
Calculates the normal at a point on the surface and assigns it to 'result'. | |
virtual bool | calcPoint (double x, double y, QgsPoint &result)=0 |
Calculates x-, y and z-value of the point on the surface and assigns it to 'result'. | |
virtual void | eliminateHorizontalTriangles ()=0 |
Eliminates the horizontal triangles by swapping. | |
virtual int | oppositePoint (int p1, int p2)=0 |
Returns the number of the point opposite to the triangle points p1, p2 (which have to be on a halfedge). | |
virtual void | performConsistencyTest ()=0 |
Performs a consistency check, remove this later. | |
virtual QgsPoint * | point (int i) const =0 |
Returns a pointer to the point with number i. | |
virtual bool | pointInside (double x, double y)=0 |
Returns true , if the point with coordinates x and y is inside the convex hull and false otherwise. | |
virtual QList< int > | pointsAroundEdge (double x, double y)=0 |
Returns a value list with the numbers of the four points, which would be affected by an edge swap. | |
virtual int | pointsCount () const =0 |
Returns the number of points. | |
virtual void | ruppertRefinement ()=0 |
Adds points to make the triangles better shaped (algorithm of ruppert) | |
virtual bool | saveTriangulation (QgsFeatureSink *sink, QgsFeedback *feedback=nullptr) const =0 |
Saves the triangulation features to a feature sink. | |
virtual void | setForcedCrossBehavior (QgsTriangulation::ForcedCrossBehavior b)=0 |
Draws the points, edges and the forced lines. | |
virtual void | setTriangleInterpolator (TriangleInterpolator *interpolator)=0 |
Sets an interpolator object. | |
virtual QList< int > | surroundingTriangles (int pointno)=0 |
Returns a value list with the information of the triangles surrounding (counterclockwise) a point. | |
virtual bool | swapEdge (double x, double y)=0 |
Reads the content of a taff-file. | |
virtual bool | triangleVertices (double x, double y, QgsPoint &p1, int &n1, QgsPoint &p2, int &n2, QgsPoint &p3, int &n3)=0 |
Finds out in which triangle the point with coordinates x and y is and assigns the numbers of the vertices to 'n1', 'n2' and 'n3' and the vertices to 'p1', 'p2' and 'p3'. | |
virtual bool | triangleVertices (double x, double y, QgsPoint &p1, QgsPoint &p2, QgsPoint &p3)=0 |
Finds out, in which triangle the point with coordinates x and y is and assigns the points at the vertices to 'p1', 'p2' and 'p3. | |
virtual QgsMesh | triangulationToMesh (QgsFeedback *feedback=nullptr) const =0 |
Returns a QgsMesh corresponding to the triangulation. | |
virtual double | xMax () const =0 |
Returns the largest x-coordinate value of the bounding box. | |
virtual double | xMin () const =0 |
Returns the smallest x-coordinate value of the bounding box. | |
virtual double | yMax () const =0 |
Returns the largest y-coordinate value of the bounding box. | |
virtual double | yMin () const =0 |
Returns the smallest x-coordinate value of the bounding box. | |
Static Public Member Functions | |
static QgsFields | triangulationFields () |
Returns the fields output by features when calling saveTriangulation(). | |
Interface for Triangulation classes.
Definition at line 41 of file qgstriangulation.h.
Enumeration describing the behavior, if two forced lines cross.
Definition at line 45 of file qgstriangulation.h.
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virtualdefault |
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pure virtual |
Adds a line (e.g.
a break-, structure- or an isoline) to the triangulation, by specifying a list of source points.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Adds a point to the triangulation.
The point should have a z-value matching the value to interpolate.
Implemented in NormVecDecorator, QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Calculates the normal at a point on the surface and assigns it to 'result'.
true
in case of success and false
in case of failure Implemented in NormVecDecorator, QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Calculates x-, y and z-value of the point on the surface and assigns it to 'result'.
Returns true
in case of success and false
in case of failure
Implemented in NormVecDecorator, QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Eliminates the horizontal triangles by swapping.
Implemented in NormVecDecorator, QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns the number of the point opposite to the triangle points p1, p2 (which have to be on a halfedge).
Returns -1 if point is a virtual point. Returns -10 if point crosses over edges.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Performs a consistency check, remove this later.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns a pointer to the point with number i.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns true
, if the point with coordinates x and y is inside the convex hull and false
otherwise.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns a value list with the numbers of the four points, which would be affected by an edge swap.
This function is e.g. needed by NormVecDecorator to know the points, for which the normals have to be recalculated. The list has to be deleted by the code which calls this method
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns the number of points.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Adds points to make the triangles better shaped (algorithm of ruppert)
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Saves the triangulation features to a feature sink.
The sink must be setup to accept LineString features, with fields matching those returned by triangulationFields().
true
in case of successImplemented in NormVecDecorator, and QgsDualEdgeTriangulation.
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pure virtual |
Draws the points, edges and the forced lines.
Sets the behavior of the triangulation in case of crossing forced lines
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Sets an interpolator object.
Implemented in NormVecDecorator, QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns a value list with the information of the triangles surrounding (counterclockwise) a point.
Four integer values describe a triangle, the first three are the number of the half edges of the triangle and the fourth is -10, if the third (and most counterclockwise) edge is a breakline, and -20 otherwise. Any virtual point needs to have the number -1
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Reads the content of a taff-file.
Saves the content to a taff file Swaps the edge which is closest to the point with x and y coordinates (if this is possible)
Implemented in NormVecDecorator, QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Finds out in which triangle the point with coordinates x and y is and assigns the numbers of the vertices to 'n1', 'n2' and 'n3' and the vertices to 'p1', 'p2' and 'p3'.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Finds out, in which triangle the point with coordinates x and y is and assigns the points at the vertices to 'p1', 'p2' and 'p3.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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static |
Returns the fields output by features when calling saveTriangulation().
These fields should be used when creating a suitable feature sink for saveTriangulation()
Definition at line 18 of file qgstriangulation.cpp.
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pure virtual |
Returns a QgsMesh corresponding to the triangulation.
Implemented in NormVecDecorator, and QgsDualEdgeTriangulation.
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pure virtual |
Returns the largest x-coordinate value of the bounding box.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns the smallest x-coordinate value of the bounding box.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns the largest y-coordinate value of the bounding box.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.
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pure virtual |
Returns the smallest x-coordinate value of the bounding box.
Implemented in QgsDualEdgeTriangulation, and TriDecorator.