Defines the list of pixel values to be considered as transparent or semi transparent when rendering rasters. More...

#include <qgsrastertransparency.h>

Classes
struct	TransparentSingleValuePixel
	Defines the transparency for a range of single-band pixel values. More...

struct	TransparentThreeValuePixel
	Defines the transparency for a RGB pixel value. More...

Public Member Functions
	QgsRasterTransparency ()=default

Q_DECL_DEPRECATED int	alphaValue (double redValue, double greenValue, double blueValue, int globalTransparency=255) const
	Returns the transparency value for a RGB pixel.

Q_DECL_DEPRECATED int	alphaValue (double value, int globalTransparency=255) const
	Returns the transparency value for a single value pixel.

void	initializeTransparentPixelList (double redValue, double greenValue, double blueValue)
	Resets the transparency list to single red, green, and blue values.

void	initializeTransparentPixelList (double value)
	Resets the transparency list to a single value.

bool	isEmpty () const
	True if there are no entries in the pixel lists except the nodata value.

double	opacityForRgbValues (double redValue, double greenValue, double blueValue) const
	Returns the opacity (as a value from 0 to 1) for a set of RGB pixel values.

double	opacityForValue (double value) const
	Returns the opacity (as a value from 0 to 1) for a single value pixel.

void	readXml (const QDomElement &elem)
	Reads the transparency information from an XML document.

void	setTransparentSingleValuePixelList (const QVector< QgsRasterTransparency::TransparentSingleValuePixel > &newList)
	Sets the transparent single value pixel list, replacing the whole existing list.

void	setTransparentThreeValuePixelList (const QVector< QgsRasterTransparency::TransparentThreeValuePixel > &newList)
	Sets the transparent three value pixel list, replacing the whole existing list.

QVector< QgsRasterTransparency::TransparentSingleValuePixel >	transparentSingleValuePixelList () const
	Returns the transparent single value pixel list.

QVector< QgsRasterTransparency::TransparentThreeValuePixel >	transparentThreeValuePixelList () const
	Returns the transparent three value pixel list.

void	writeXml (QDomDocument &doc, QDomElement &parentElem) const
	Writes the transparency information to an XML document.

Detailed Description

Defines the list of pixel values to be considered as transparent or semi transparent when rendering rasters.

Definition at line 33 of file qgsrastertransparency.h.

Constructor & Destructor Documentation

◆ QgsRasterTransparency()

QgsRasterTransparency::QgsRasterTransparency ( )

default

Member Function Documentation

◆ alphaValue() [1/2]

int QgsRasterTransparency::alphaValue	(	double	redValue,
		double	greenValue,
		double	blueValue,
		int	globalTransparency = `255`
	)		const

Returns the transparency value for a RGB pixel.

Searches through the transparency list, if a match is found, the global transparency value is scaled by the stored transparency value.

Parameters

redValue	the red portion of the needle to search for in the transparency hay stack
greenValue	the green portion of the needle to search for in the transparency hay stack
blueValue	the green portion of the needle to search for in the transparency hay stack
globalTransparency	the overall transparency level for the layer

Deprecated:: QGIS 3.40. Use opacityForRgbValues() instead.

Definition at line 93 of file qgsrastertransparency.cpp.

◆ alphaValue() [2/2]

int QgsRasterTransparency::alphaValue	(	double	value,
		int	globalTransparency = `255`
	)		const

Returns the transparency value for a single value pixel.

Searches through the transparency list, and if a match is found, the global transparency value is scaled by the stored transparency value.

Parameters

value	the needle to search for in the transparency hay stack
globalTransparency	the overall transparency level for the layer

Deprecated:: QGIS 3.40. Use opacityForValue() instead.

Definition at line 64 of file qgsrastertransparency.cpp.

◆ initializeTransparentPixelList() [1/2]

void QgsRasterTransparency::initializeTransparentPixelList	(	double	redValue,
		double	greenValue,
		double	blueValue
	)

Resets the transparency list to single red, green, and blue values.

Definition at line 45 of file qgsrastertransparency.cpp.

◆ initializeTransparentPixelList() [2/2]

void QgsRasterTransparency::initializeTransparentPixelList ( double value )

Resets the transparency list to a single value.

Definition at line 36 of file qgsrastertransparency.cpp.

◆ isEmpty()

bool QgsRasterTransparency::isEmpty ( ) const

True if there are no entries in the pixel lists except the nodata value.

Definition at line 122 of file qgsrastertransparency.cpp.

◆ opacityForRgbValues()

double QgsRasterTransparency::opacityForRgbValues	(	double	redValue,
		double	greenValue,
		double	blueValue
	)		const

Returns the opacity (as a value from 0 to 1) for a set of RGB pixel values.

Searches through the transparency list, and if a match is found, returns the opacity corresponding to the values. Returns 1 if no matches are found.

If any of the red, green or blue values are NaN, 0 will be returned.

Since: QGIS 3.38

Definition at line 98 of file qgsrastertransparency.cpp.

◆ opacityForValue()

double QgsRasterTransparency::opacityForValue ( double value ) const

Returns the opacity (as a value from 0 to 1) for a single value pixel.

Searches through the transparency list, and if a match is found, returns the opacity corresponding to the value. Returns 1 if no matches are found.

Since: QGIS 3.38

Definition at line 69 of file qgsrastertransparency.cpp.

◆ readXml()

void QgsRasterTransparency::readXml ( const QDomElement & elem )

Reads the transparency information from an XML document.

Definition at line 169 of file qgsrastertransparency.cpp.

◆ setTransparentSingleValuePixelList()

void QgsRasterTransparency::setTransparentSingleValuePixelList ( const QVector< QgsRasterTransparency::TransparentSingleValuePixel > & newList )

Sets the transparent single value pixel list, replacing the whole existing list.

See also: transparentSingleValuePixelList()

Definition at line 54 of file qgsrastertransparency.cpp.

◆ setTransparentThreeValuePixelList()

void QgsRasterTransparency::setTransparentThreeValuePixelList ( const QVector< QgsRasterTransparency::TransparentThreeValuePixel > & newList )

Sets the transparent three value pixel list, replacing the whole existing list.

See also: transparentThreeValuePixelList()

Definition at line 59 of file qgsrastertransparency.cpp.

◆ transparentSingleValuePixelList()

QVector< QgsRasterTransparency::TransparentSingleValuePixel > QgsRasterTransparency::transparentSingleValuePixelList ( ) const

Returns the transparent single value pixel list.

See also: setTransparentSingleValuePixelList()

Definition at line 26 of file qgsrastertransparency.cpp.

◆ transparentThreeValuePixelList()

QVector< QgsRasterTransparency::TransparentThreeValuePixel > QgsRasterTransparency::transparentThreeValuePixelList ( ) const

Returns the transparent three value pixel list.

See also: setTransparentThreeValuePixelList()

Definition at line 31 of file qgsrastertransparency.cpp.

◆ writeXml()

void QgsRasterTransparency::writeXml	(	QDomDocument &	doc,
		QDomElement &	parentElem
	)		const

Writes the transparency information to an XML document.

Definition at line 127 of file qgsrastertransparency.cpp.

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

/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/raster/qgsrastertransparency.h
/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/raster/qgsrastertransparency.cpp

Classes

Public Member Functions