QGIS API Documentation 3.39.0Master (734b709c2f9)

Decorator class which adds the functionality of estimating normals at the data points. More...
#include <NormVecDecorator.h>
Public Types  
enum  PointState { Normal , BreakLine , EndPoint } 
Enumeration for the state of a point. Normal means, that the point is not on a BreakLine, BreakLine means that the point is on a breakline (but not an end point of it) and EndPoint means, that it is an endpoint of a breakline. More...  
Public Types inherited from QgsTriangulation  
enum  ForcedCrossBehavior { SnappingTypeVertex , DeleteFirst , InsertVertex } 
Enumeration describing the behavior, if two forced lines cross. More...  
Public Member Functions  
NormVecDecorator ()  
NormVecDecorator (QgsTriangulation *tin)  
Constructor for TriDecorator with an existing triangulation.  
~NormVecDecorator () override  
int  addPoint (const QgsPoint &p) override 
Adds a point to the triangulation.  
bool  calcNormal (double x, double y, QgsPoint &result) override 
Calculates the normal at a point on the surface and assigns it to 'result'. Returns true in case of success and false in case of failure.  
bool  calcNormalForPoint (double x, double y, int pointIndex, Vector3D *result) 
Calculates the normal of a trianglepoint for the point with coordinates x and y. This is needed, if a point is on a break line and there is no unique normal stored in 'mNormVec'. Returns false , it something went wrong and true otherwise.  
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 or by insertion of new points. If alreadyestimated is true , a reestimation of the normals will be done.  
bool  estimateFirstDerivative (int pointno) 
Estimates the first derivative a point. Return true in case of success and false otherwise.  
bool  estimateFirstDerivatives (QgsFeedback *feedback=nullptr) 
This method adds the functionality of estimating normals at the data points. Return true in the case of success and false otherwise.  
Vector3D *  getNormal (int n) const 
Returns a pointer to the normal vector for the point with the number n.  
PointState  getState (int pointno) const 
Returns the state of the point with the number 'pointno'.  
bool  getTriangle (double x, double y, QgsPoint &p1, int &ptn1, Vector3D *v1, PointState *state1, QgsPoint &p2, int &ptn2, Vector3D *v2, PointState *state2, QgsPoint &p3, int &ptn3, Vector3D *v3, PointState *state3) 
This function behaves similar to the one above. Additionally, the numbers of the points are returned (ptn1, ptn2, ptn3) as well as the PointStates of the triangle points (state1, state2, state3)  
bool  getTriangle (double x, double y, QgsPoint &p1, Vector3D *v1, QgsPoint &p2, Vector3D *v2, QgsPoint &p3, Vector3D *v3) 
Finds out, in which triangle a point with coordinates x and y is and assigns the triangle points to p1, p2, p3 and the estimated normals to v1, v2, v3. The vectors are normally taken from 'mNormVec', except if p1, p2 or p3 is a point on a breakline. In this case, the normal is calculated onthefly. Returns false , if something went wrong and true otherwise.  
bool  saveTriangulation (QgsFeatureSink *sink, QgsFeedback *feedback=nullptr) const override 
Saves the triangulation features to a feature sink.  
void  setTriangleInterpolator (TriangleInterpolator *inter) override 
Sets an interpolator.  
bool  swapEdge (double x, double y) override 
Swaps the edge which is closest to the point with x and y coordinates (if this is possible) and forces recalculation of the concerned normals (if alreadyestimated is true )  
QgsMesh  triangulationToMesh (QgsFeedback *feedback=nullptr) const override 
Returns a QgsMesh corresponding to the triangulation.  
Public Member Functions inherited from TriDecorator  
TriDecorator ()=default  
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 
Protected Member Functions  
void  setState (int pointno, PointState s) 
Sets the state (BreakLine, Normal, EndPoint) of a point.  
Protected Attributes  
bool  alreadyestimated 
Is true , if the normals already have been estimated.  
TriangleInterpolator *  mInterpolator = nullptr 
Association with an interpolator object.  
QVector< Vector3D * > *  mNormVec 
Vector that stores the normals for the points. If 'estimateFirstDerivatives()' was called and there is nullptr , this means, that the triangle point is on a breakline.  
QVector< PointState > *  mPointState 
Vector who stores, it a point is not on a breakline, if it is a normal point of the breakline or if it is an endpoint of a breakline.  
Protected Attributes inherited from TriDecorator  
QgsTriangulation *  mTIN = nullptr 
Association with a Triangulation object.  
Static Protected Attributes  
static const unsigned int  DEFAULT_STORAGE_FOR_NORMALS = 100000 
Additional Inherited Members  
Static Public Member Functions inherited from QgsTriangulation  
static QgsFields  triangulationFields () 
Returns the fields output by features when calling saveTriangulation().  
Decorator class which adds the functionality of estimating normals at the data points.
Definition at line 36 of file NormVecDecorator.h.
Enumeration for the state of a point. Normal means, that the point is not on a BreakLine, BreakLine means that the point is on a breakline (but not an end point of it) and EndPoint means, that it is an endpoint of a breakline.
Enumerator  

Normal  
BreakLine  
EndPoint 
Definition at line 40 of file NormVecDecorator.h.

inline 
Definition at line 94 of file NormVecDecorator.h.

inline 
Constructor for TriDecorator with an existing triangulation.
Definition at line 101 of file NormVecDecorator.h.

override 
Definition at line 27 of file NormVecDecorator.cpp.

overridevirtual 
Adds a point to the triangulation.
The point should have a zvalue matching the value to interpolate.
Implements QgsTriangulation.
Definition at line 43 of file NormVecDecorator.cpp.

overridevirtual 
Calculates the normal at a 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 83 of file NormVecDecorator.cpp.
bool NormVecDecorator::calcNormalForPoint  (  double  x, 
double  y,  
int  pointIndex,  
Vector3D *  result  
) 
Calculates the normal of a trianglepoint for the point with coordinates x and y. This is needed, if a point is on a break line and there is no unique normal stored in 'mNormVec'. Returns false
, it something went wrong and true
otherwise.
Definition at line 103 of file NormVecDecorator.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 228 of file NormVecDecorator.cpp.

overridevirtual 
Eliminates the horizontal triangles by swapping or by insertion of new points. If alreadyestimated is true
, a reestimation of the normals will be done.
Implements QgsTriangulation.
Definition at line 509 of file NormVecDecorator.cpp.
bool NormVecDecorator::estimateFirstDerivative  (  int  pointno  ) 
Estimates the first derivative a point. Return true
in case of success and false
otherwise.
Definition at line 346 of file NormVecDecorator.cpp.
bool NormVecDecorator::estimateFirstDerivatives  (  QgsFeedback *  feedback = nullptr  ) 
This method adds the functionality of estimating normals at the data points. Return true
in the case of success and false
otherwise.
Definition at line 494 of file NormVecDecorator.cpp.

inline 
Returns a pointer to the normal vector for the point with the number n.
Definition at line 114 of file NormVecDecorator.h.
NormVecDecorator::PointState NormVecDecorator::getState  (  int  pointno  )  const 
Returns the state of the point with the number 'pointno'.
Definition at line 293 of file NormVecDecorator.cpp.
bool NormVecDecorator::getTriangle  (  double  x, 
double  y,  
QgsPoint &  p1,  
int &  ptn1,  
Vector3D *  v1,  
PointState *  state1,  
QgsPoint &  p2,  
int &  ptn2,  
Vector3D *  v2,  
PointState *  state2,  
QgsPoint &  p3,  
int &  ptn3,  
Vector3D *  v3,  
PointState *  state3  
) 
This function behaves similar to the one above. Additionally, the numbers of the points are returned (ptn1, ptn2, ptn3) as well as the PointStates of the triangle points (state1, state2, state3)
Definition at line 307 of file NormVecDecorator.cpp.
bool NormVecDecorator::getTriangle  (  double  x, 
double  y,  
QgsPoint &  p1,  
Vector3D *  v1,  
QgsPoint &  p2,  
Vector3D *  v2,  
QgsPoint &  p3,  
Vector3D *  v3  
) 
Finds out, in which triangle a point with coordinates x and y is and assigns the triangle points to p1, p2, p3 and the estimated normals to v1, v2, v3. The vectors are normally taken from 'mNormVec', except if p1, p2 or p3 is a point on a breakline. In this case, the normal is calculated onthefly. Returns false
, if something went wrong and true
otherwise.
Definition at line 249 of file NormVecDecorator.cpp.

overridevirtual 
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 successImplements QgsTriangulation.
Definition at line 571 of file NormVecDecorator.cpp.

protected 
Sets the state (BreakLine, Normal, EndPoint) of a point.
Definition at line 529 of file NormVecDecorator.cpp.

inlineoverridevirtual 
Sets an interpolator.
Implements QgsTriangulation.
Definition at line 109 of file NormVecDecorator.h.

overridevirtual 
Swaps the edge which is closest to the point with x and y coordinates (if this is possible) and forces recalculation of the concerned normals (if alreadyestimated is true
)
Implements QgsTriangulation.
Definition at line 541 of file NormVecDecorator.cpp.

overridevirtual 
Returns a QgsMesh corresponding to the triangulation.
Implements QgsTriangulation.
Definition at line 580 of file NormVecDecorator.cpp.

protected 
Is true
, if the normals already have been estimated.
Definition at line 76 of file NormVecDecorator.h.

staticprotected 
Definition at line 77 of file NormVecDecorator.h.

protected 
Association with an interpolator object.
Definition at line 79 of file NormVecDecorator.h.

protected 
Vector that stores the normals for the points. If 'estimateFirstDerivatives()' was called and there is nullptr
, this means, that the triangle point is on a breakline.
Definition at line 81 of file NormVecDecorator.h.

protected 
Vector who stores, it a point is not on a breakline, if it is a normal point of the breakline or if it is an endpoint of a breakline.
Definition at line 83 of file NormVecDecorator.h.