QGIS API Documentation 3.35.0Master (6cf940c20d6)

Decorator class for Triangulations (s. More...
#include <TriDecorator.h>
Public Member Functions  
TriDecorator ()=default  
Constructor for TriDecorator.  
TriDecorator (QgsTriangulation *t)  
Constructor for TriDecorator with an existing triangulation.  
void  addLine (const QVector< QgsPoint > &points, QgsInterpolator::SourceType lineType) override 
Adds a line (e.g.  
int  addPoint (const QgsPoint &p) override 
Adds a point to the triangulation.  
virtual void  addTriangulation (QgsTriangulation *t) 
Adds an association to a triangulation.  
bool  calcNormal (double x, double y, QgsPoint &result) override 
Calculates the normal at a point on the surface and assigns it to 'result'.  
bool  calcPoint (double x, double y, QgsPoint &result) override 
Calculates x, y and zvalue of the point on the surface and assigns it to 'result'.  
void  eliminateHorizontalTriangles () override 
Eliminates the horizontal triangles by swapping.  
int  oppositePoint (int p1, int p2) override 
Returns the number of the point opposite to the triangle points p1, p2 (which have to be on a halfedge).  
void  performConsistencyTest () override 
Performs a consistency check, remove this later.  
QgsPoint *  point (int i) const override 
Returns a pointer to the point with number i.  
bool  pointInside (double x, double y) override 
Returns true , if the point with coordinates x and y is inside the convex hull and false otherwise.  
QList< int >  pointsAroundEdge (double x, double y) override 
Returns a value list with the numbers of the four points, which would be affected by an edge swap.  
int  pointsCount () const override 
Returns the number of points.  
void  ruppertRefinement () override 
Adds points to make the triangles better shaped (algorithm of ruppert)  
void  setForcedCrossBehavior (QgsTriangulation::ForcedCrossBehavior b) override 
Draws the points, edges and the forced lines.  
void  setTriangleInterpolator (TriangleInterpolator *interpolator) override 
Sets an interpolator object.  
QList< int >  surroundingTriangles (int pointno) override 
Returns a value list with the information of the triangles surrounding (counterclockwise) a point.  
bool  swapEdge (double x, double y) override 
Reads the content of a tafffile.  
bool  triangleVertices (double x, double y, QgsPoint &p1, int &n1, QgsPoint &p2, int &n2, QgsPoint &p3, int &n3) override 
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'.  
bool  triangleVertices (double x, double y, QgsPoint &p1, QgsPoint &p2, QgsPoint &p3) override 
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.  
double  xMax () const override 
Returns the largest xcoordinate value of the bounding box.  
double  xMin () const override 
Returns the smallest xcoordinate value of the bounding box.  
double  yMax () const override 
Returns the largest ycoordinate value of the bounding box.  
double  yMin () const override 
Returns the smallest xcoordinate value of the bounding box.  
Public Member Functions inherited from QgsTriangulation  
virtual  ~QgsTriangulation ()=default 
virtual bool  saveTriangulation (QgsFeatureSink *sink, QgsFeedback *feedback=nullptr) const =0 
Saves the triangulation features to a feature sink.  
virtual QgsMesh  triangulationToMesh (QgsFeedback *feedback=nullptr) const =0 
Returns a QgsMesh corresponding to the triangulation.  
Protected Attributes  
QgsTriangulation *  mTIN = nullptr 
Association with a Triangulation object.  
Additional Inherited Members  
Public Types inherited from QgsTriangulation  
enum  ForcedCrossBehavior { SnappingTypeVertex , DeleteFirst , InsertVertex } 
Enumeration describing the behavior, if two forced lines cross. More...  
Static Public Member Functions inherited from QgsTriangulation  
static QgsFields  triangulationFields () 
Returns the fields output by features when calling saveTriangulation().  
Decorator class for Triangulations (s.
Decorator pattern in Gamma et al.).
Definition at line 31 of file TriDecorator.h.

default 
Constructor for TriDecorator.

inlineexplicit 
Constructor for TriDecorator with an existing triangulation.
Definition at line 70 of file TriDecorator.h.

overridevirtual 
Adds a line (e.g.
a break, structure or an isoline) to the triangulation, by specifying a list of source points.
Implements QgsTriangulation.
Definition at line 20 of file TriDecorator.cpp.

overridevirtual 
Adds a point to the triangulation.
The point should have a zvalue matching the value to interpolate.
Implements QgsTriangulation.
Definition at line 32 of file TriDecorator.cpp.

inlinevirtual 
Adds an association to a triangulation.
Definition at line 76 of file TriDecorator.h.

overridevirtual 
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 Implements QgsTriangulation.
Definition at line 58 of file TriDecorator.cpp.

overridevirtual 
Calculates x, y and zvalue of the point on the surface and assigns it to 'result'.
Returns true
in case of success and false
in case of failure
Implements QgsTriangulation.
Definition at line 72 of file TriDecorator.cpp.

overridevirtual 
Eliminates the horizontal triangles by swapping.
Implements QgsTriangulation.
Definition at line 246 of file TriDecorator.cpp.

overridevirtual 
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.
Implements QgsTriangulation.
Definition at line 141 of file TriDecorator.cpp.

overridevirtual 
Performs a consistency check, remove this later.
Implements QgsTriangulation.
Definition at line 46 of file TriDecorator.cpp.

overridevirtual 
Returns a pointer to the point with number i.
Implements QgsTriangulation.
Definition at line 86 of file TriDecorator.cpp.

overridevirtual 
Returns true
, if the point with coordinates x and y is inside the convex hull and false
otherwise.
Implements QgsTriangulation.
Definition at line 270 of file TriDecorator.cpp.

overridevirtual 
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
Implements QgsTriangulation.
Definition at line 298 of file TriDecorator.cpp.

overridevirtual 
Returns the number of points.
Implements QgsTriangulation.
Definition at line 128 of file TriDecorator.cpp.

overridevirtual 
Adds points to make the triangles better shaped (algorithm of ruppert)
Implements QgsTriangulation.
Definition at line 258 of file TriDecorator.cpp.

overridevirtual 
Draws the points, edges and the forced lines.
Sets the behavior of the triangulation in case of crossing forced lines
Implements QgsTriangulation.
Definition at line 222 of file TriDecorator.cpp.

overridevirtual 
Sets an interpolator object.
Implements QgsTriangulation.
Definition at line 234 of file TriDecorator.cpp.

overridevirtual 
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
Implements QgsTriangulation.
Definition at line 155 of file TriDecorator.cpp.

overridevirtual 
Reads the content of a tafffile.
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)
Implements QgsTriangulation.
Definition at line 284 of file TriDecorator.cpp.

overridevirtual 
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'.
Implements QgsTriangulation.
Definition at line 100 of file TriDecorator.cpp.

overridevirtual 
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.
Implements QgsTriangulation.
Definition at line 114 of file TriDecorator.cpp.

overridevirtual 
Returns the largest xcoordinate value of the bounding box.
Implements QgsTriangulation.
Definition at line 167 of file TriDecorator.cpp.

overridevirtual 
Returns the smallest xcoordinate value of the bounding box.
Implements QgsTriangulation.
Definition at line 181 of file TriDecorator.cpp.

overridevirtual 
Returns the largest ycoordinate value of the bounding box.
Implements QgsTriangulation.
Definition at line 194 of file TriDecorator.cpp.

overridevirtual 
Returns the smallest xcoordinate value of the bounding box.
Implements QgsTriangulation.
Definition at line 208 of file TriDecorator.cpp.

protected 
Association with a Triangulation object.
Definition at line 65 of file TriDecorator.h.