Triangular/Derived Mesh is mesh with vertices in map coordinates. More...

#include <qgstriangularmesh.h>

Public Member Functions
	QgsTriangularMesh ()
	Ctor. More...

	~QgsTriangularMesh ()
	Dtor. More...

double	averageTriangleSize () const
	Returns the average size of triangles in map unit. More...

Q_DECL_DEPRECATED const QVector< QgsMeshVertex > &	centroids () const
	Returns centroids of the native faces in map CRS. More...

bool	contains (const QgsMesh::ElementType &type) const
	Returns whether the mesh contains at mesh elements of given type. More...

const QVector< QgsMeshVertex > &	edgeCentroids () const
	Returns centroids of the native edges in map CRS. More...

QList< int >	edgeIndexesForRectangle (const QgsRectangle &rectangle) const
	Finds indexes of edges intersecting given bounding box It uses spatial indexing. More...

const QVector< QgsMeshEdge > &	edges () const
	Returns edges. More...

const QVector< int > &	edgesToNativeEdges () const
	Returns mapping between edges and original edges. More...

QgsRectangle	extent () const
	Returns the extent of the triangular mesh in map coordinates. More...

const QVector< QgsMeshVertex > &	faceCentroids () const
	Returns centroids of the native faces in map CRS. More...

QList< int >	faceIndexesForRectangle (const QgsRectangle &rectangle) const
	Finds indexes of triangles intersecting given bounding box It uses spatial indexing. More...

int	faceIndexForPoint (const QgsPointXY &point) const
	Finds index of triangle at given point It uses spatial indexing. More...

int	faceIndexForPoint_v2 (const QgsPointXY &point) const
	Finds index of triangle at given point It uses spatial indexing and don't use geos to be faster. More...

int	levelOfDetail () const
	Returns the corresponding index of level of detail on which this mesh is associated. More...

QVector< QgsTriangularMesh * >	simplifyMesh (double reductionFactor, int minimumTrianglesCount=10) const
	Returns simplified meshes. More...

const QVector< QgsMeshFace > &	triangles () const
	Returns triangles. More...

const QVector< int > &	trianglesToNativeFaces () const
	Returns mapping between triangles and original faces. More...

bool	update (QgsMesh *nativeMesh, const QgsCoordinateTransform &transform=QgsCoordinateTransform())
	Constructs triangular mesh from layer's native mesh and transform to destination CRS. More...

QVector< QVector3D >	vertexNormals (float vertScale) const
	Calculates and returns normale vector on each vertex that is part of any face. More...

const QVector< QgsMeshVertex > &	vertices () const
	Returns vertices in map coordinate system. More...

Friends
class	TestQgsTriangularMesh

Detailed Description

Triangular/Derived Mesh is mesh with vertices in map coordinates.

It creates spatial index for identification of a triangle that contains a particular point on the map.

Note: The API is considered EXPERIMENTAL and can be changed without a notice

Since: QGIS 3.2

Definition at line 50 of file qgstriangularmesh.h.

Constructor & Destructor Documentation

◆ QgsTriangularMesh()

QgsTriangularMesh::QgsTriangularMesh ( )

default

Ctor.

◆ ~QgsTriangularMesh()

QgsTriangularMesh::~QgsTriangularMesh ( )

default

Dtor.

Member Function Documentation

◆ averageTriangleSize()

double QgsTriangularMesh::averageTriangleSize ( ) const

Returns the average size of triangles in map unit.

It is calculated using the maximum of the height/width of the bounding box of each triangles.

Since: QGIS 3.14

Definition at line 114 of file qgstriangularmesh.cpp.

◆ centroids()

const QVector< QgsMeshVertex > & QgsTriangularMesh::centroids ( ) const

Returns centroids of the native faces in map CRS.

Deprecated:: since QGIS 3.14 use faceCentroids() instead

Definition at line 310 of file qgstriangularmesh.cpp.

◆ contains()

bool QgsTriangularMesh::contains ( const QgsMesh::ElementType & type ) const

Returns whether the mesh contains at mesh elements of given type.

Since: QGIS 3.14

Definition at line 280 of file qgstriangularmesh.cpp.

◆ edgeCentroids()

const QVector< QgsMeshVertex > & QgsTriangularMesh::edgeCentroids ( ) const

Returns centroids of the native edges in map CRS.

Since: QGIS 3.14

Definition at line 320 of file qgstriangularmesh.cpp.

◆ edgeIndexesForRectangle()

QList< int > QgsTriangularMesh::edgeIndexesForRectangle ( const QgsRectangle & rectangle ) const

Finds indexes of edges intersecting given bounding box It uses spatial indexing.

Parameters

rectangle bounding box in map coordinate system

Returns: edges indexes that intersect the rectangle

Definition at line 366 of file qgstriangularmesh.cpp.

◆ edges()

const QVector< QgsMeshEdge > & QgsTriangularMesh::edges ( ) const

Returns edges.

Definition at line 305 of file qgstriangularmesh.cpp.

◆ edgesToNativeEdges()

const QVector< int > & QgsTriangularMesh::edgesToNativeEdges ( ) const

Returns mapping between edges and original edges.

Definition at line 330 of file qgstriangularmesh.cpp.

◆ extent()

QgsRectangle QgsTriangularMesh::extent ( ) const

Returns the extent of the triangular mesh in map coordinates.

Returns: bounding box of the triangular mesh

Since: QGIS 3.14

Definition at line 270 of file qgstriangularmesh.cpp.

◆ faceCentroids()

const QVector< QgsMeshVertex > & QgsTriangularMesh::faceCentroids ( ) const

Returns centroids of the native faces in map CRS.

Since: QGIS 3.14

Definition at line 315 of file qgstriangularmesh.cpp.

◆ faceIndexesForRectangle()

QList< int > QgsTriangularMesh::faceIndexesForRectangle ( const QgsRectangle & rectangle ) const

Finds indexes of triangles intersecting given bounding box It uses spatial indexing.

Parameters

rectangle bounding box in map coordinate system

Returns: triangle indexes that intersect the rectangle

Since: QGIS 3.4

Definition at line 361 of file qgstriangularmesh.cpp.

◆ faceIndexForPoint()

int QgsTriangularMesh::faceIndexForPoint ( const QgsPointXY & point ) const

Finds index of triangle at given point It uses spatial indexing.

Parameters

point point in map coordinate system

Returns: triangle index that contains the given point, -1 if no such triangle exists

Since: QGIS 3.4

Definition at line 335 of file qgstriangularmesh.cpp.

◆ faceIndexForPoint_v2()

int QgsTriangularMesh::faceIndexForPoint_v2 ( const QgsPointXY & point ) const

Finds index of triangle at given point It uses spatial indexing and don't use geos to be faster.

Parameters

point point in map coordinate system

Returns: triangle index that contains the given point, -1 if no such triangle exists

Since: QGIS 3.12

Definition at line 348 of file qgstriangularmesh.cpp.

◆ levelOfDetail()

int QgsTriangularMesh::levelOfDetail ( ) const

Returns the corresponding index of level of detail on which this mesh is associated.

0: base mesh
1: first simplified mesh
2: second simplified mesh (lower level of detail)
...

Since: QGIS 3.14

Definition at line 275 of file qgstriangularmesh.cpp.

◆ simplifyMesh()

QVector< QgsTriangularMesh * > QgsTriangularMesh::simplifyMesh	(	double	reductionFactor,
		int	minimumTrianglesCount = `10`
	)		const

Returns simplified meshes.

The first simplified mesh is simplified with a goal of a number of triangles equals to the number of triangles of the base mesh divised by the reduction factor. For the following mesh the same reduction factor is used with the prededent goal of number of triangles. There are as many simplified meshes as necessary to have a the minimum triangles count on the last simplified mesh.

The caller has to take the ownership of returned meshes.

Not implemented for Edge meshes and Mixed meshes

Parameters

reductionFactor	is the factor used to reduce the number of triangles of the mesh
minimumTrianglesCount	is the minimal faces count on simplified mesh

Since: QGIS 3.14

Definition at line 396 of file qgstriangularmesh.cpp.

◆ triangles()

const QVector< QgsMeshFace > & QgsTriangularMesh::triangles ( ) const

Returns triangles.

Definition at line 300 of file qgstriangularmesh.cpp.

◆ trianglesToNativeFaces()

const QVector< int > & QgsTriangularMesh::trianglesToNativeFaces ( ) const

Returns mapping between triangles and original faces.

Definition at line 325 of file qgstriangularmesh.cpp.

◆ update()

bool QgsTriangularMesh::update	(	QgsMesh *	nativeMesh,
		const QgsCoordinateTransform &	transform = `QgsCoordinateTransform()`
	)

Constructs triangular mesh from layer's native mesh and transform to destination CRS.

Populates spatial index.

Parameters

nativeMesh	QgsMesh to access native vertices and faces
transform	Transformation from layer CRS to destination (e.g. map) CRS. With invalid transform, it keeps the native mesh CRS

Returns: true if the mesh is effectivly updated, and false if not

Definition at line 122 of file qgstriangularmesh.cpp.

◆ vertexNormals()

QVector< QVector3D > QgsTriangularMesh::vertexNormals ( float vertScale ) const

Calculates and returns normale vector on each vertex that is part of any face.

Returns: all normales at vertices

Since: QGIS 3.12

Definition at line 371 of file qgstriangularmesh.cpp.

◆ vertices()

const QVector< QgsMeshVertex > & QgsTriangularMesh::vertices ( ) const

Returns vertices in map coordinate system.

The list of consist of vertices from native mesh (0-N) and extra vertices needed to create triangles (N+1 - len)

Definition at line 295 of file qgstriangularmesh.cpp.

Friends And Related Function Documentation

◆ TestQgsTriangularMesh

friend class TestQgsTriangularMesh

friend

Definition at line 250 of file qgstriangularmesh.h.

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

/build/qgis-3.20.0+99unstable/src/core/mesh/qgstriangularmesh.h
/build/qgis-3.20.0+99unstable/src/core/mesh/qgstriangularmesh.cpp

Public Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

◆ QgsTriangularMesh()

◆ ~QgsTriangularMesh()

Member Function Documentation

◆ averageTriangleSize()

◆ centroids()

◆ contains()

◆ edgeCentroids()

◆ edgeIndexesForRectangle()

◆ edges()

◆ edgesToNativeEdges()

◆ extent()

◆ faceCentroids()

◆ faceIndexesForRectangle()

◆ faceIndexForPoint()

◆ faceIndexForPoint_v2()

◆ levelOfDetail()

◆ simplifyMesh()

◆ triangles()

◆ trianglesToNativeFaces()

◆ update()

◆ vertexNormals()

◆ vertices()

Friends And Related Function Documentation

◆ TestQgsTriangularMesh