QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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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 triangle-point 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 z-value 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 re-estimation 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 on-the-fly. 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 z-value 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 taff-file. | |
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 x-coordinate value of the bounding box. | |
double | xMin () const override |
Returns the smallest x-coordinate value of the bounding box. | |
double | yMax () const override |
Returns the largest y-coordinate value of the bounding box. | |
double | yMin () const override |
Returns the smallest x-coordinate 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 | |
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Normal | |
BreakLine | |
EndPoint |
Definition at line 40 of file NormVecDecorator.h.
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inline |
Definition at line 94 of file NormVecDecorator.h.
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inline |
Constructor for TriDecorator with an existing triangulation.
Definition at line 101 of file NormVecDecorator.h.
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override |
Definition at line 27 of file NormVecDecorator.cpp.
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overridevirtual |
Adds a point to the triangulation.
The point should have a z-value matching the value to interpolate.
Implements QgsTriangulation.
Definition at line 43 of file NormVecDecorator.cpp.
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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 triangle-point 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.
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overridevirtual |
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
Implements QgsTriangulation.
Definition at line 228 of file NormVecDecorator.cpp.
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overridevirtual |
Eliminates the horizontal triangles by swapping or by insertion of new points. If alreadyestimated is true
, a re-estimation 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.
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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 on-the-fly. Returns false
, if something went wrong and true
otherwise.
Definition at line 249 of file NormVecDecorator.cpp.
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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.
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protected |
Sets the state (BreakLine, Normal, EndPoint) of a point.
Definition at line 529 of file NormVecDecorator.cpp.
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inlineoverridevirtual |
Sets an interpolator.
Implements QgsTriangulation.
Definition at line 109 of file NormVecDecorator.h.
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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.
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overridevirtual |
Returns a QgsMesh corresponding to the triangulation.
Implements QgsTriangulation.
Definition at line 580 of file NormVecDecorator.cpp.
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protected |
Is true
, if the normals already have been estimated.
Definition at line 76 of file NormVecDecorator.h.
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staticprotected |
Definition at line 77 of file NormVecDecorator.h.
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protected |
Association with an interpolator object.
Definition at line 79 of file NormVecDecorator.h.
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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.
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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.