DualEdgeTriangulation is an implementation of a triangulation class based on the dual edge data structure. More...

#include <DualEdgeTriangulation.h>

Inheritance diagram for DualEdgeTriangulation:

Public Member Functions
	DualEdgeTriangulation ()

	DualEdgeTriangulation (int nop, Triangulation *decorator)

	~DualEdgeTriangulation () override

void	addLine (const QVector< QgsPoint > &points, QgsInterpolator::SourceType lineType) override
	Adds a line (e.g. More...

int	addPoint (const QgsPoint &p) override
	Adds a point to the triangulation. More...

bool	calcNormal (double x, double y, Vector3D *result) override
	Calculates the normal at a point on the surface. More...

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'. More...

void	eliminateHorizontalTriangles () override
	Eliminates the horizontal triangles by swapping or by insertion of new points. More...

int	getNumberOfPoints () const override
	Returns the number of points. More...

int	getOppositePoint (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). More...

QgsPoint *	getPoint (int i) const override
	Draws the points, edges and the forced lines. More...

QList< int > *	getPointsAroundEdge (double x, double y) override
	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 returned ValueList has to be deleted by the code which calls the method. More...

QList< int >	getSurroundingTriangles (int pointno) override
	Returns a pointer to a value list with the information of the triangles surrounding (counterclockwise) a point. More...

bool	getTriangle (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'. More...

bool	getTriangle (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. More...

double	getXMax () const override
	Returns the largest x-coordinate value of the bounding box. More...

double	getXMin () const override
	Returns the smallest x-coordinate value of the bounding box. More...

double	getYMax () const override
	Returns the largest y-coordinate value of the bounding box. More...

double	getYMin () const override
	Returns the smallest x-coordinate value of the bounding box. More...

void	performConsistencyTest () override
	Performs a consistency check, remove this later. More...

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. More...

void	ruppertRefinement () override
	Adds points to make the triangles better shaped (algorithm of ruppert) More...

bool	saveTriangulation (QgsFeatureSink sink, QgsFeedback feedback=nullptr) const override
	Saves the triangulation features to a feature sink. More...

void	setBreakEdgeColor (int r, int g, int b) override
	Sets the color of the breaklines. More...

void	setDecorator (Triangulation *d)

void	setEdgeColor (int r, int g, int b) override
	Sets the color of the normal edges. More...

void	setForcedCrossBehavior (Triangulation::ForcedCrossBehavior b) override
	Sets the behavior of the triangulation in case of crossing forced lines. More...

void	setForcedEdgeColor (int r, int g, int b) override
	Sets the color of the forced edges. More...

void	setTriangleInterpolator (TriangleInterpolator *interpolator) override
	Sets an interpolator object. More...

bool	swapEdge (double x, double y) override
	Reads the dual edge structure of a taff file. More...

Public Member Functions inherited from Triangulation
virtual	~Triangulation ()=default

Protected Member Functions
int	baseEdgeOfPoint (int point)
	Returns the number of an edge which points to the point with number 'point' or -1 if there is an error. More...

int	baseEdgeOfTriangle (const QgsPoint &point)
	Returns the number of a HalfEdge from a triangle in which 'point' is in. If the number -10 is returned, this means, that 'point' is outside the convex hull. If -5 is returned, then numerical problems with the leftOfTest occurred (and the value of the possible edge is stored in the variable 'mUnstableEdge'. -20 means, that the inserted point is exactly on an edge (the number is stored in the variable 'mEdgeWithPoint'). -25 means, that the point is already in the triangulation (the number of the point is stored in the member 'mTwiceInsPoint'. If -100 is returned, this means that something else went wrong. More...

bool	checkSwap (unsigned int edge, unsigned int recursiveDeep)
	Checks, if 'edge' has to be swapped because of the empty circle criterion. If so, doSwap(...) is called. More...

void	doOnlySwap (unsigned int edge)
	Swaps 'edge' and does no recursiv testing. More...

void	doSwap (unsigned int edge, unsigned int recursiveDeep)
	Swaps 'edge' and test recursively for other swaps (delaunay criterion) More...

bool	edgeOnConvexHull (int edge)
	Returns true, if a half edge is on the convex hull and false otherwise. More...

void	evaluateInfluenceRegion (QgsPoint *point, int edge, QSet< int > &set)
	Function needed for the ruppert algorithm. Tests, if point is in the circle through both endpoints of edge and the endpoint of edge->dual->next->point. If so, the function calls itself recursively for edge->next and edge->next->next. Stops, if it finds a forced edge or a convex hull edge. More...

bool	halfEdgeBBoxTest (int edge, double xlowleft, double ylowleft, double xupright, double yupright) const
	Tests, if the bounding box of the halfedge with index i intersects the specified bounding box. The main purpose for this method is the drawing of the triangulation. More...

unsigned int	insertEdge (int dual, int next, int point, bool mbreak, bool forced)
	Inserts an edge and makes sure, everything is OK with the storage of the edge. The number of the HalfEdge is returned. More...

int	insertForcedSegment (int p1, int p2, QgsInterpolator::SourceType segmentType)
	Inserts a forced segment between the points with the numbers p1 and p2 into the triangulation and returns the number of a HalfEdge belonging to this forced edge or -100 in case of failure. More...

int	splitHalfEdge (int edge, float position)
	Inserts a new point on the halfedge with number 'edge'. The position can have a value from 0 to 1 (e.g. 0.5 would be in the middle). The return value is the number of the new inserted point. tin is the triangulation, which should be used to calculate the elevation of the inserted point. More...

double	swapMinAngle (int edge) const
	Calculates the minimum angle, which would be present, if the specified halfedge would be swapped. More...

bool	swapPossible (unsigned int edge)
	Returns true, if it is possible to swap an edge, otherwise false(concave quad or edge on (or outside) the convex hull) More...

void	triangulatePolygon (QList< int > poly, QList< int > free, int mainedge)
	Divides a polygon in a triangle and two polygons and calls itself recursively for these two polygons. 'poly' is a pointer to a list with the numbers of the edges of the polygon, 'free' is a pointer to a list of free halfedges, and 'mainedge' is the number of the edge, towards which the new triangle is inserted. Mainedge has to be the same as poly->begin(), otherwise the recursion does not work. More...

Protected Attributes
QColor	mBreakEdgeColor
	Color to paint the breaklines. More...

Triangulation *	mDecorator = nullptr
	Pointer to the decorator using this triangulation. It it is used directly, mDecorator equals this. More...

QColor	mEdgeColor
	Color to paint the normal edges. More...

unsigned int	mEdgeInside = 0
	Number of an edge which does not point to the virtual point. It continuously updated for a fast search. More...

unsigned int	mEdgeOutside = 0
	Number of an edge on the outside of the convex hull. It is updated in method 'baseEdgeOfTriangle' to enable insertion of points outside the convex hull. More...

unsigned int	mEdgeWithPoint = 0
	If an inserted point is exactly on an existing edge, 'baseEdgeOfTriangle' returns -20 and sets the variable 'mEdgeWithPoint'. More...

Triangulation::ForcedCrossBehavior	mForcedCrossBehavior = Triangulation::DeleteFirst
	Member to store the behavior in case of crossing forced segments. More...

QColor	mForcedEdgeColor
	Color to paint the forced edges. More...

QVector< HalfEdge * >	mHalfEdge
	Stores pointers to the HalfEdges. More...

QVector< QgsPoint * >	mPointVector
	Stores pointers to all points in the triangulations (including the points contained in the lines) More...

TriangleInterpolator *	mTriangleInterpolator = nullptr
	Association to an interpolator object. More...

int	mTwiceInsPoint = 0
	If a point has been inserted twice, its number is stored in this member. More...

unsigned int	mUnstableEdge = 0
	If an instability occurs in 'baseEdgeOfTriangle', mUnstableEdge is set to the value of the current edge. More...

double	xMax = 0
	X-coordinate of the upper right corner of the bounding box. More...

double	xMin = 0
	X-coordinate of the lower left corner of the bounding box. More...

double	yMax = 0
	Y-coordinate of the upper right corner of the bounding box. More...

double	yMin = 0
	Y-coordinate of the lower left corner of the bounding box. More...

Static Protected Attributes
static const unsigned int	DEFAULT_STORAGE_FOR_HALF_EDGES = 300006
	Default value for the number of storable HalfEdges at the beginning. More...

static const unsigned int	DEFAULT_STORAGE_FOR_POINTS = 100000
	Default value for the number of storable points at the beginning. More...

static const int	MAX_BASE_ITERATIONS = 300000
	Threshold for the leftOfTest to handle numerical instabilities. More...

Friends
class	TestQgsInterpolator

Additional Inherited Members
Public Types inherited from Triangulation
enum	ForcedCrossBehavior { SnappingTypeVertex, DeleteFirst, InsertVertex }
	Enumeration describing the behavior, if two forced lines cross. More...

Static Public Member Functions inherited from Triangulation
static QgsFields	triangulationFields ()
	Returns the fields output by features when calling saveTriangulation(). More...

Detailed Description

DualEdgeTriangulation is an implementation of a triangulation class based on the dual edge data structure.

Note: Not available in Python bindings.

Definition at line 47 of file DualEdgeTriangulation.h.

Constructor & Destructor Documentation

DualEdgeTriangulation::DualEdgeTriangulation ( )

inline

Definition at line 183 of file DualEdgeTriangulation.h.

DualEdgeTriangulation::DualEdgeTriangulation	(	int	nop,
		Triangulation *	decorator
	)

inline

Definition at line 193 of file DualEdgeTriangulation.h.

DualEdgeTriangulation::~DualEdgeTriangulation ( )

override

Definition at line 28 of file DualEdgeTriangulation.cpp.

Member Function Documentation

void DualEdgeTriangulation::addLine	(	const QVector< QgsPoint > &	points,
		QgsInterpolator::SourceType	lineType
	)

overridevirtual

Adds a line (e.g.

a break-, structure- or an isoline) to the triangulation, by specifying a list of source points.

Implements Triangulation.

Definition at line 69 of file DualEdgeTriangulation.cpp.

int DualEdgeTriangulation::addPoint ( const QgsPoint & point )

overridevirtual

Adds a point to the triangulation.

The point should have a z-value matching the value to interpolate.

Implements Triangulation.

Definition at line 101 of file DualEdgeTriangulation.cpp.

int DualEdgeTriangulation::baseEdgeOfPoint ( int point )

protected

Returns the number of an edge which points to the point with number 'point' or -1 if there is an error.

Definition at line 372 of file DualEdgeTriangulation.cpp.

int DualEdgeTriangulation::baseEdgeOfTriangle ( const QgsPoint & point )

protected

Returns the number of a HalfEdge from a triangle in which 'point' is in. If the number -10 is returned, this means, that 'point' is outside the convex hull. If -5 is returned, then numerical problems with the leftOfTest occurred (and the value of the possible edge is stored in the variable 'mUnstableEdge'. -20 means, that the inserted point is exactly on an edge (the number is stored in the variable 'mEdgeWithPoint'). -25 means, that the point is already in the triangulation (the number of the point is stored in the member 'mTwiceInsPoint'. If -100 is returned, this means that something else went wrong.

Definition at line 444 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::calcNormal	(	double	x,
		double	y,
		Vector3D *	result
	)

overridevirtual

Calculates the normal at a point on the surface.

Implements Triangulation.

Definition at line 621 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::calcPoint	(	double	x,
		double	y,
		QgsPoint &	result
	)

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 flase in case of failure

Implements Triangulation.

Definition at line 634 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::checkSwap	(	unsigned int	edge,
		unsigned int	recursiveDeep
	)

protected

Checks, if 'edge' has to be swapped because of the empty circle criterion. If so, doSwap(...) is called.

Definition at line 647 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::doOnlySwap ( unsigned int edge )

protected

Swaps 'edge' and does no recursiv testing.

Definition at line 664 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::doSwap	(	unsigned int	edge,
		unsigned int	recursiveDeep
	)

protected

Swaps 'edge' and test recursively for other swaps (delaunay criterion)

Definition at line 682 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::edgeOnConvexHull ( int edge )

protected

Returns true, if a half edge is on the convex hull and false otherwise.

Definition at line 3136 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::eliminateHorizontalTriangles ( )

overridevirtual

Eliminates the horizontal triangles by swapping or by insertion of new points.

Implements Triangulation.

Definition at line 1535 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::evaluateInfluenceRegion	(	QgsPoint *	point,
		int	edge,
		QSet< int > &	set
	)

protected

Function needed for the ruppert algorithm. Tests, if point is in the circle through both endpoints of edge and the endpoint of edge->dual->next->point. If so, the function calls itself recursively for edge->next and edge->next->next. Stops, if it finds a forced edge or a convex hull edge.

Definition at line 3141 of file DualEdgeTriangulation.cpp.

int DualEdgeTriangulation::getNumberOfPoints ( ) const

inlineoverridevirtual

Returns the number of points.

Implements Triangulation.

Definition at line 203 of file DualEdgeTriangulation.h.

int DualEdgeTriangulation::getOppositePoint	(	int	p1,
		int	p2
	)

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 Triangulation.

Definition at line 856 of file DualEdgeTriangulation.cpp.

QgsPoint * DualEdgeTriangulation::getPoint ( int i ) const

inlineoverridevirtual

Draws the points, edges and the forced lines.

Returns a pointer to the point with number i

Implements Triangulation.

Definition at line 208 of file DualEdgeTriangulation.h.

QList< int > * DualEdgeTriangulation::getPointsAroundEdge	(	double	x,
		double	y
	)

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 returned ValueList has to be deleted by the code which calls the method.

Implements Triangulation.

Definition at line 2915 of file DualEdgeTriangulation.cpp.

QList< int > DualEdgeTriangulation::getSurroundingTriangles ( int pointno )

overridevirtual

Returns a pointer to 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 Triangulation.

Definition at line 890 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::getTriangle	(	double	x,
		double	y,
		QgsPoint &	p1,
		int &	n1,
		QgsPoint &	p2,
		int &	n2,
		QgsPoint &	p3,
		int &	n3
	)

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 Triangulation.

Definition at line 926 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::getTriangle	(	double	x,
		double	y,
		QgsPoint &	p1,
		QgsPoint &	p2,
		QgsPoint &	p3
	)

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 Triangulation.

Definition at line 1034 of file DualEdgeTriangulation.cpp.

double DualEdgeTriangulation::getXMax ( ) const

inlineoverridevirtual

Returns the largest x-coordinate value of the bounding box.

Implements Triangulation.

Definition at line 70 of file DualEdgeTriangulation.h.

double DualEdgeTriangulation::getXMin ( ) const

inlineoverridevirtual

Returns the smallest x-coordinate value of the bounding box.

Implements Triangulation.

Definition at line 72 of file DualEdgeTriangulation.h.

double DualEdgeTriangulation::getYMax ( ) const

inlineoverridevirtual

Returns the largest y-coordinate value of the bounding box.

Implements Triangulation.

Definition at line 74 of file DualEdgeTriangulation.h.

double DualEdgeTriangulation::getYMin ( ) const

inlineoverridevirtual

Returns the smallest x-coordinate value of the bounding box.

Implements Triangulation.

Definition at line 76 of file DualEdgeTriangulation.h.

bool DualEdgeTriangulation::halfEdgeBBoxTest	(	int	edge,
		double	xlowleft,
		double	ylowleft,
		double	xupright,
		double	yupright
	)		const

inlineprotected

Tests, if the bounding box of the halfedge with index i intersects the specified bounding box. The main purpose for this method is the drawing of the triangulation.

Definition at line 216 of file DualEdgeTriangulation.h.

unsigned int DualEdgeTriangulation::insertEdge	(	int	dual,
		int	next,
		int	point,
		bool	mbreak,
		bool	forced
	)

protected

Inserts an edge and makes sure, everything is OK with the storage of the edge. The number of the HalfEdge is returned.

Definition at line 1132 of file DualEdgeTriangulation.cpp.

int DualEdgeTriangulation::insertForcedSegment	(	int	p1,
		int	p2,
		QgsInterpolator::SourceType	segmentType
	)

protected

Inserts a forced segment between the points with the numbers p1 and p2 into the triangulation and returns the number of a HalfEdge belonging to this forced edge or -100 in case of failure.

Definition at line 1140 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::performConsistencyTest ( )

overridevirtual

Performs a consistency check, remove this later.

Implements Triangulation.

Definition at line 49 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::pointInside	(	double	x,
		double	y
	)

overridevirtual

Returns true, if the point with coordinates x and y is inside the convex hull and false otherwise.

Implements Triangulation.

Definition at line 2488 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::ruppertRefinement ( )

overridevirtual

Adds points to make the triangles better shaped (algorithm of ruppert)

Implements Triangulation.

Definition at line 1624 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::saveTriangulation	(	QgsFeatureSink *	sink,
		QgsFeedback *	feedback = `nullptr`
	)		const

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().

Returns: true in case of success

See also: triangulationFields()

Since: QGIS 3.0

Implements Triangulation.

Definition at line 2978 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::setBreakEdgeColor	(	int	r,
		int	g,
		int	b
	)

overridevirtual

Sets the color of the breaklines.

Implements Triangulation.

Definition at line 1525 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::setDecorator ( Triangulation * d )

inline

Definition at line 53 of file DualEdgeTriangulation.h.

void DualEdgeTriangulation::setEdgeColor	(	int	r,
		int	g,
		int	b
	)

overridevirtual

Sets the color of the normal edges.

Implements Triangulation.

Definition at line 1515 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::setForcedCrossBehavior ( Triangulation::ForcedCrossBehavior b )

overridevirtual

Sets the behavior of the triangulation in case of crossing forced lines.

Implements Triangulation.

Definition at line 1510 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::setForcedEdgeColor	(	int	r,
		int	g,
		int	b
	)

overridevirtual

Sets the color of the forced edges.

Implements Triangulation.

Definition at line 1520 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::setTriangleInterpolator ( TriangleInterpolator * interpolator )

overridevirtual

Sets an interpolator object.

Implements Triangulation.

Definition at line 1530 of file DualEdgeTriangulation.cpp.

int DualEdgeTriangulation::splitHalfEdge	(	int	edge,
		float	position
	)

protected

Inserts a new point on the halfedge with number 'edge'. The position can have a value from 0 to 1 (e.g. 0.5 would be in the middle). The return value is the number of the new inserted point. tin is the triangulation, which should be used to calculate the elevation of the inserted point.

Definition at line 3081 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::swapEdge	(	double	x,
		double	y
	)

overridevirtual

Reads the dual edge structure of a taff file.

Saves the dual edge structure to a taff file Swaps the edge which is closest to the point with x and y coordinates (if this is possible)

Implements Triangulation.

Definition at line 2854 of file DualEdgeTriangulation.cpp.

double DualEdgeTriangulation::swapMinAngle ( int edge ) const

protected

Calculates the minimum angle, which would be present, if the specified halfedge would be swapped.

Definition at line 3041 of file DualEdgeTriangulation.cpp.

bool DualEdgeTriangulation::swapPossible ( unsigned int edge )

protected

Returns true, if it is possible to swap an edge, otherwise false(concave quad or edge on (or outside) the convex hull)

Definition at line 2314 of file DualEdgeTriangulation.cpp.

void DualEdgeTriangulation::triangulatePolygon	(	QList< int > *	poly,
		QList< int > *	free,
		int	mainedge
	)

protected

Divides a polygon in a triangle and two polygons and calls itself recursively for these two polygons. 'poly' is a pointer to a list with the numbers of the edges of the polygon, 'free' is a pointer to a list of free halfedges, and 'mainedge' is the number of the edge, towards which the new triangle is inserted. Mainedge has to be the same as poly->begin(), otherwise the recursion does not work.

Definition at line 2351 of file DualEdgeTriangulation.cpp.

Friends And Related Function Documentation

friend class TestQgsInterpolator

friend

Definition at line 178 of file DualEdgeTriangulation.h.

Member Data Documentation

const unsigned int DualEdgeTriangulation::DEFAULT_STORAGE_FOR_HALF_EDGES = 300006

staticprotected

Default value for the number of storable HalfEdges at the beginning.

Definition at line 120 of file DualEdgeTriangulation.h.

const unsigned int DualEdgeTriangulation::DEFAULT_STORAGE_FOR_POINTS = 100000

staticprotected

Default value for the number of storable points at the beginning.

Definition at line 116 of file DualEdgeTriangulation.h.

const int DualEdgeTriangulation::MAX_BASE_ITERATIONS = 300000

staticprotected

Threshold for the leftOfTest to handle numerical instabilities.

Security to prevent endless loops in 'baseEdgeOfTriangle'. It there are more iteration then this number, the point will not be inserted

Definition at line 142 of file DualEdgeTriangulation.h.

QColor DualEdgeTriangulation::mBreakEdgeColor

protected

Color to paint the breaklines.

Definition at line 132 of file DualEdgeTriangulation.h.

Triangulation* DualEdgeTriangulation::mDecorator = nullptr

protected

Pointer to the decorator using this triangulation. It it is used directly, mDecorator equals this.

Definition at line 134 of file DualEdgeTriangulation.h.

QColor DualEdgeTriangulation::mEdgeColor

protected

Color to paint the normal edges.

Definition at line 128 of file DualEdgeTriangulation.h.

unsigned int DualEdgeTriangulation::mEdgeInside = 0

protected

Number of an edge which does not point to the virtual point. It continuously updated for a fast search.

Definition at line 154 of file DualEdgeTriangulation.h.

unsigned int DualEdgeTriangulation::mEdgeOutside = 0

protected

Number of an edge on the outside of the convex hull. It is updated in method 'baseEdgeOfTriangle' to enable insertion of points outside the convex hull.

Definition at line 156 of file DualEdgeTriangulation.h.

unsigned int DualEdgeTriangulation::mEdgeWithPoint = 0

protected

If an inserted point is exactly on an existing edge, 'baseEdgeOfTriangle' returns -20 and sets the variable 'mEdgeWithPoint'.

Definition at line 158 of file DualEdgeTriangulation.h.

Triangulation::ForcedCrossBehavior DualEdgeTriangulation::mForcedCrossBehavior = Triangulation::DeleteFirst

protected

Member to store the behavior in case of crossing forced segments.

Definition at line 126 of file DualEdgeTriangulation.h.

QColor DualEdgeTriangulation::mForcedEdgeColor

protected

Color to paint the forced edges.

Definition at line 130 of file DualEdgeTriangulation.h.

QVector<HalfEdge *> DualEdgeTriangulation::mHalfEdge

protected

Stores pointers to the HalfEdges.

Definition at line 122 of file DualEdgeTriangulation.h.

QVector<QgsPoint *> DualEdgeTriangulation::mPointVector

protected

Stores pointers to all points in the triangulations (including the points contained in the lines)

Definition at line 118 of file DualEdgeTriangulation.h.

TriangleInterpolator* DualEdgeTriangulation::mTriangleInterpolator = nullptr

protected

Association to an interpolator object.

Definition at line 124 of file DualEdgeTriangulation.h.

int DualEdgeTriangulation::mTwiceInsPoint = 0

protected

If a point has been inserted twice, its number is stored in this member.

Definition at line 162 of file DualEdgeTriangulation.h.

unsigned int DualEdgeTriangulation::mUnstableEdge = 0

protected

If an instability occurs in 'baseEdgeOfTriangle', mUnstableEdge is set to the value of the current edge.

Definition at line 160 of file DualEdgeTriangulation.h.

double DualEdgeTriangulation::xMax = 0

protected

X-coordinate of the upper right corner of the bounding box.

Definition at line 108 of file DualEdgeTriangulation.h.

double DualEdgeTriangulation::xMin = 0

protected

X-coordinate of the lower left corner of the bounding box.

Definition at line 110 of file DualEdgeTriangulation.h.

double DualEdgeTriangulation::yMax = 0

protected

Y-coordinate of the upper right corner of the bounding box.

Definition at line 112 of file DualEdgeTriangulation.h.

double DualEdgeTriangulation::yMin = 0

protected

Y-coordinate of the lower left corner of the bounding box.

Definition at line 114 of file DualEdgeTriangulation.h.

The documentation for this class was generated from the following files:

/build/qgis-3.4.15+24xenial/src/analysis/interpolation/DualEdgeTriangulation.h
/build/qgis-3.4.15+24xenial/src/analysis/interpolation/DualEdgeTriangulation.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Static Protected Attributes

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation