QgsTriangularMesh Class Reference

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

#include <qgstriangularmesh.h>

Public Member Functions
	QgsTriangularMesh ()=default
	Ctor. More...
	~QgsTriangularMesh ()=default
	Dtor. More...
const QVector< QgsMeshVertex > &	centroids () 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...
const QVector< QgsMeshFace > &	triangles () const
	Returns triangles. More...
const QVector< int > &	trianglesToNativeFaces () const
	Returns mapping between triangles and original faces. More...
void	update (QgsMesh *nativeMesh, QgsRenderContext *context)
	Constructs triangular mesh from layer's native mesh and context. More...
const QVector< QgsMeshVertex > &	vertices () const
	Returns vertices in map coordinate system. More...

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 86 of file qgstriangularmesh.h.

Constructor & Destructor Documentation

QgsTriangularMesh::QgsTriangularMesh ( )

default

Ctor.

QgsTriangularMesh::~QgsTriangularMesh ( )

default

Dtor.

Member Function Documentation

const QVector< QgsMeshVertex > & QgsTriangularMesh::centroids

(

)

const

Returns centroids of the native faces in map CRS.

Definition at line 222 of file qgstriangularmesh.cpp.

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 246 of file qgstriangularmesh.cpp.

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 232 of file qgstriangularmesh.cpp.

const QVector< QgsMeshFace > & QgsTriangularMesh::triangles

(

)

const

Returns triangles.

Definition at line 217 of file qgstriangularmesh.cpp.

const QVector< int > & QgsTriangularMesh::trianglesToNativeFaces

(

)

const

Returns mapping between triangles and original faces.

Definition at line 227 of file qgstriangularmesh.cpp.

void QgsTriangularMesh::update	(	QgsMesh *	nativeMesh,
		QgsRenderContext *	context
	)

Constructs triangular mesh from layer's native mesh and context.

Populates spatial index.

Parameters

nativeMesh	QgsMesh to access native vertices and faces
context	Rendering context to estimate number of triagles to create for an face

Definition at line 111 of file qgstriangularmesh.cpp.

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 212 of file qgstriangularmesh.cpp.

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

• /build/qgis-3.4.15+24xenial/src/core/mesh/qgstriangularmesh.h
• /build/qgis-3.4.15+24xenial/src/core/mesh/qgstriangularmesh.cpp