QgsTessellator Class Reference

Class that takes care of tessellation of polygons into triangles. More...

#include <qgstessellator.h>

Public Member Functions
	QgsTessellator (double originX, double originY, bool addNormals, bool invertNormals=false, bool addBackFaces=false)
	Creates tessellator with a specified origin point of the world (in map coordinates) More...
void	addPolygon (const QgsPolygon &polygon, float extrusionHeight)
	Tessellates a triangle and adds its vertex entries to the output data array. More...
std::unique_ptr< QgsMultiPolygon >	asMultiPolygon () const
	Returns the triangulation as a multipolygon geometry. More...
QVector< float >	data () const
	Returns array of triangle vertex data. More...
int	dataVerticesCount () const
	Returns the number of vertices stored in the output data array. More...
int	stride () const
	Returns size of one vertex entry in bytes. More...

Detailed Description

Class that takes care of tessellation of polygons into triangles.

It is expected that client code will create the tessellator object, then repeatedly call addPolygon() method that will generate triangles, and finally call data() to get final vertex data.

Optionally provides extrusion by adding triangles that serve as walls when extrusion height is non-zero.

Since

QGIS 3.4 (since QGIS 3.0 in QGIS_3D library)

Definition at line 39 of file qgstessellator.h.

Constructor & Destructor Documentation

QgsTessellator::QgsTessellator	(	double	originX,
		double	originY,
		bool	addNormals,
		bool	invertNormals = false,
		bool	addBackFaces = false
	)

Creates tessellator with a specified origin point of the world (in map coordinates)

Definition at line 69 of file qgstessellator.cpp.

Member Function Documentation

void QgsTessellator::addPolygon	(	const QgsPolygon &	polygon,
		float	extrusionHeight
	)

Tessellates a triangle and adds its vertex entries to the output data array.

Definition at line 353 of file qgstessellator.cpp.

std::unique_ptr< QgsMultiPolygon > QgsTessellator::asMultiPolygon

(

)

const

Returns the triangulation as a multipolygon geometry.

Definition at line 553 of file qgstessellator.cpp.

QVector<float> QgsTessellator::data ( ) const

inline

Returns array of triangle vertex data.

Vertice coordinates are stored as (x, z, -y)

Definition at line 53 of file qgstessellator.h.

int QgsTessellator::dataVerticesCount

(

)

const

Returns the number of vertices stored in the output data array.

Definition at line 548 of file qgstessellator.cpp.

int QgsTessellator::stride ( ) const

inline

Returns size of one vertex entry in bytes.

Definition at line 59 of file qgstessellator.h.

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

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