Tessellates polygons into triangles. More...

#include <qgstessellator.h>

Public Member Functions
	QgsTessellator ()
Q_DECL_DEPRECATED	QgsTessellator (const QgsRectangle &bounds, bool addNormals, bool invertNormals=false, bool addBackFaces=false, bool noZ=false, bool addTextureCoords=false, int facade=3, float textureRotation=0.0f)
	Creates tessellator with a specified bounds of input geometry coordinates.
Q_DECL_DEPRECATED	QgsTessellator (double originX, double originY, bool addNormals, bool invertNormals=false, bool addBackFaces=false, bool noZ=false, bool addTextureCoords=false, int facade=3, float textureRotation=0.0f)
	Creates tessellator with a specified origin point of the world (in map coordinates).
void	addPolygon (const QgsPolygon &polygon, float extrusionHeight)
	Tessellates a triangle and adds its vertex entries to the output data array.
std::unique_ptr< QgsMultiPolygon >	asMultiPolygon () const
	Returns the triangulation as a multipolygon geometry.
QVector< float >	data () const
	Returns array of triangle vertex data.
int	dataVerticesCount () const
	Returns the number of vertices stored in the output data array.
QString	error () const
	Returns a descriptive error string if the tessellation failed.
Qgis::ExtrusionFaces	extrusionFaces () const
	Returns which faces are generated during extrusion.
bool	hasBackFacesEnabled () const
	Returns whether back faces are being added to the output data (`true`) or not (`false`).
bool	hasInvertedNormals () const
	Returns whether normals are inverted (`true`) or not (`false`).
bool	hasNormals () const
	Returns whether normals are being added to the output data (`true`) or not (`false`).
bool	hasTextureUVs () const
	Returns whether texture UV coordinates are being added to the output data (`true`) or not (`false`).
bool	isOutputZUp () const
	Returns whether the "up" direction should be the Z axis on output (`true`), otherwise the "up" direction will be the Y axis (`false`).
bool	isZValueIgnored () const
	Returns whether Z values from the input geometries are ignored (`true`) or not (`false`).
QgsVector3D	origin () const
	Returns the origin point of the map.
void	setAddNormals (bool addNormals)
	Sets whether normals should be added to the output data (`true`) or not (`false`).
void	setAddTextureUVs (bool addTextureUVs)
	Sets whether texture UV coordinates should be added to the output data (`true`) or not (`false`).
void	setBackFacesEnabled (bool addBackFaces)
	Sets whether back faces should be added to the output data (`true`) or not (`false`).
void	setBounds (const QgsRectangle &bounds)
	Sets scaling and the bounds of the input geometry coordinates.
void	setExtrusionFaces (Qgis::ExtrusionFaces faces)
	Sets which faces should be generated during extrusion.
void	setInputZValueIgnored (bool ignore)
	Sets whether Z values from the input geometries are ignored (`true`) or not (`false`).
void	setInvertNormals (bool invertNormals)
	Sets whether normals should be inverted (`true`) or not (`false`).
void	setOrigin (const QgsVector3D &origin)
	Sets the origin point of the map.
void	setOutputZUp (bool zUp)
	Sets whether the "up" direction should be the Z axis on output (`true`), otherwise the "up" direction will be the Y axis (`false`).
void	setTextureRotation (float rotation)
	Sets the rotation of texture UV coordinates (in degrees).
int	stride () const
	Returns size of one vertex entry in bytes.
float	textureRotation () const
	Returns the rotation of texture UV coordinates (in degrees).
float	zMaximum () const
	Returns maximal Z value of the data (in world coordinates).
float	zMinimum () const
	Returns minimal Z value of the data (in world coordinates).

Detailed Description

Tessellates 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.

Definition at line 39 of file qgstessellator.h.

Constructor & Destructor Documentation

◆ QgsTessellator() [1/3]

QgsTessellator::QgsTessellator ( )

default

◆ QgsTessellator() [2/3]

QgsTessellator::QgsTessellator	(	double	originX,
		double	originY,
		bool	addNormals,
		bool	invertNormals = false,
		bool	addBackFaces = false,
		bool	noZ = false,
		bool	addTextureCoords = false,
		int	facade = 3,
		float	textureRotation = 0.0f )

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

Deprecated: QGIS 4.0. Use the default QgsTessellator() constructor and individual setters instead.

Definition at line 182 of file qgstessellator.cpp.

◆ QgsTessellator() [3/3]

QgsTessellator::QgsTessellator	(	const QgsRectangle &	bounds,
		bool	addNormals,
		bool	invertNormals = false,
		bool	addBackFaces = false,
		bool	noZ = false,
		bool	addTextureCoords = false,
		int	facade = 3,
		float	textureRotation = 0.0f )

Creates tessellator with a specified bounds of input geometry coordinates.

This constructor allows the tessellator to map input coordinates to a desirable range for numerical stability during calculations.

If noZ is true, then a 2-dimensional tessellation only will be performed and all z coordinates will be ignored.

Since: QGIS 3.10

Deprecated: QGIS 4.0. Use the default QgsTessellator() constructor and individual setters instead.

Definition at line 195 of file qgstessellator.cpp.

Member Function Documentation

◆ addPolygon()

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

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

Definition at line 669 of file qgstessellator.cpp.

◆ asMultiPolygon()

std::unique_ptr< QgsMultiPolygon > QgsTessellator::asMultiPolygon ( ) const

Returns the triangulation as a multipolygon geometry.

Definition at line 816 of file qgstessellator.cpp.

◆ data()

QVector< float > QgsTessellator::data ( ) const

inline

Returns array of triangle vertex data.

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

Definition at line 191 of file qgstessellator.h.

◆ dataVerticesCount()

int QgsTessellator::dataVerticesCount ( ) const

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

Definition at line 808 of file qgstessellator.cpp.

◆ error()

QString QgsTessellator::error ( ) const

inline

Returns a descriptive error string if the tessellation failed.

Since: QGIS 3.34

Definition at line 221 of file qgstessellator.h.

◆ extrusionFaces()

Qgis::ExtrusionFaces QgsTessellator::extrusionFaces ( ) const

inline

Returns which faces are generated during extrusion.

Since: QGIS 4.0

Definition at line 105 of file qgstessellator.h.

◆ hasBackFacesEnabled()

bool QgsTessellator::hasBackFacesEnabled ( ) const

inline

Returns whether back faces are being added to the output data (true) or not (false).

Since: QGIS 4.0

Definition at line 153 of file qgstessellator.h.

◆ hasInvertedNormals()

bool QgsTessellator::hasInvertedNormals ( ) const

inline

Returns whether normals are inverted (true) or not (false).

Since: QGIS 4.0

Definition at line 165 of file qgstessellator.h.

◆ hasNormals()

bool QgsTessellator::hasNormals ( ) const

inline

Returns whether normals are being added to the output data (true) or not (false).

Since: QGIS 4.0

Definition at line 141 of file qgstessellator.h.

◆ hasTextureUVs()

bool QgsTessellator::hasTextureUVs ( ) const

inline

Returns whether texture UV coordinates are being added to the output data (true) or not (false).

Since: QGIS 4.0

Definition at line 129 of file qgstessellator.h.

◆ isOutputZUp()

bool QgsTessellator::isOutputZUp ( ) const

inline

Returns whether the "up" direction should be the Z axis on output (true), otherwise the "up" direction will be the Y axis (false).

The default value is false (to keep compatibility for existing tessellator use cases).

Since: QGIS 3.42

Definition at line 181 of file qgstessellator.h.

◆ isZValueIgnored()

bool QgsTessellator::isZValueIgnored ( ) const

inline

Returns whether Z values from the input geometries are ignored (true) or not (false).

Since: QGIS 4.0

Definition at line 93 of file qgstessellator.h.

◆ origin()

QgsVector3D QgsTessellator::origin ( ) const

inline

Returns the origin point of the map.

Since: QGIS 4.0

Definition at line 74 of file qgstessellator.h.

◆ setAddNormals()

void QgsTessellator::setAddNormals ( bool addNormals )

Sets whether normals should be added to the output data (true) or not (false).

Since: QGIS 4.0

Definition at line 268 of file qgstessellator.cpp.

◆ setAddTextureUVs()

void QgsTessellator::setAddTextureUVs ( bool addTextureUVs )

Sets whether texture UV coordinates should be added to the output data (true) or not (false).

Since: QGIS 4.0

Definition at line 274 of file qgstessellator.cpp.

◆ setBackFacesEnabled()

void QgsTessellator::setBackFacesEnabled ( bool addBackFaces )

Sets whether back faces should be added to the output data (true) or not (false).

Since: QGIS 4.0

Definition at line 258 of file qgstessellator.cpp.

◆ setBounds()

void QgsTessellator::setBounds ( const QgsRectangle & bounds )

Sets scaling and the bounds of the input geometry coordinates.

Since: QGIS 4.0

Definition at line 213 of file qgstessellator.cpp.

◆ setExtrusionFaces()

void QgsTessellator::setExtrusionFaces ( Qgis::ExtrusionFaces faces )

Sets which faces should be generated during extrusion.

Since: QGIS 4.0

Definition at line 224 of file qgstessellator.cpp.

◆ setInputZValueIgnored()

void QgsTessellator::setInputZValueIgnored ( bool ignore )

Sets whether Z values from the input geometries are ignored (true) or not (false).

By default, this is false.

Since: QGIS 4.0

Definition at line 219 of file qgstessellator.cpp.

◆ setInvertNormals()

void QgsTessellator::setInvertNormals ( bool invertNormals )

Sets whether normals should be inverted (true) or not (false).

Since: QGIS 4.0

Definition at line 263 of file qgstessellator.cpp.

◆ setOrigin()

void QgsTessellator::setOrigin ( const QgsVector3D & origin )

Sets the origin point of the map.

Since: QGIS 4.0

Definition at line 208 of file qgstessellator.cpp.

◆ setOutputZUp()

void QgsTessellator::setOutputZUp ( bool zUp )

inline

Sets whether the "up" direction should be the Z axis on output (true), otherwise the "up" direction will be the Y axis (false).

The default value is false (to keep compatibility for existing tessellator use cases).

Since: QGIS 3.42

Definition at line 173 of file qgstessellator.h.

◆ setTextureRotation()

void QgsTessellator::setTextureRotation ( float rotation )

Sets the rotation of texture UV coordinates (in degrees).

Since: QGIS 4.0

Definition at line 253 of file qgstessellator.cpp.

◆ stride()

int QgsTessellator::stride ( ) const

inline

Returns size of one vertex entry in bytes.

Definition at line 197 of file qgstessellator.h.

◆ textureRotation()

float QgsTessellator::textureRotation ( ) const

inline

Returns the rotation of texture UV coordinates (in degrees).

Since: QGIS 4.0

Definition at line 117 of file qgstessellator.h.

◆ zMaximum()

float QgsTessellator::zMaximum ( ) const

inline

Returns maximal Z value of the data (in world coordinates).

Since: QGIS 3.12

Definition at line 214 of file qgstessellator.h.

◆ zMinimum()

float QgsTessellator::zMinimum ( ) const

inline

Returns minimal Z value of the data (in world coordinates).

Since: QGIS 3.12

Definition at line 208 of file qgstessellator.h.

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

/build/qgis-3.99.0+git20251210+2fe06baccd8+99sid/src/core/qgstessellator.h
/build/qgis-3.99.0+git20251210+2fe06baccd8+99sid/src/core/qgstessellator.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ QgsTessellator() [1/3]

◆ QgsTessellator() [2/3]

◆ QgsTessellator() [3/3]

Member Function Documentation

◆ addPolygon()

◆ asMultiPolygon()

◆ data()

◆ dataVerticesCount()

◆ error()

◆ extrusionFaces()

◆ hasBackFacesEnabled()

◆ hasInvertedNormals()

◆ hasNormals()

◆ hasTextureUVs()

◆ isOutputZUp()

◆ isZValueIgnored()

◆ origin()

◆ setAddNormals()

◆ setAddTextureUVs()

◆ setBackFacesEnabled()

◆ setBounds()

◆ setExtrusionFaces()

◆ setInputZValueIgnored()

◆ setInvertNormals()

◆ setOrigin()

◆ setOutputZUp()

◆ setTextureRotation()

◆ stride()

◆ textureRotation()

◆ zMaximum()

◆ zMinimum()