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

#include <qgsrastertransparency.h>

Classes
struct	TransparentSingleValuePixel

struct	TransparentThreeValuePixel

Public Member Functions
	QgsRasterTransparency ()=default
	Constructor for QgsRasterTransparency. More...

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

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

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

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

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

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

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

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

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

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

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

Detailed Description

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

Definition at line 32 of file qgsrastertransparency.h.

Constructor & Destructor Documentation

◆ QgsRasterTransparency()

QgsRasterTransparency::QgsRasterTransparency ( )

default

Constructor for QgsRasterTransparency.

Member Function Documentation

◆ alphaValue() [1/2]

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

Definition at line 74 of file qgsrastertransparency.cpp.

◆ alphaValue() [2/2]

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 overal transparency level for the layer

Definition at line 106 of file qgsrastertransparency.cpp.

◆ initializeTransparentPixelList() [1/2]

void QgsRasterTransparency::initializeTransparentPixelList ( double value )

Resets the transparency list to a single value.

Definition at line 37 of file qgsrastertransparency.cpp.

◆ initializeTransparentPixelList() [2/2]

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

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

Definition at line 50 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 142 of file qgsrastertransparency.cpp.

◆ readXml()

void QgsRasterTransparency::readXml ( const QDomElement & elem )

Reads the transparency information from an XML document.

Definition at line 183 of file qgsrastertransparency.cpp.

◆ setTransparentSingleValuePixelList()

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

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

See also: transparentSingleValuePixelList()

Definition at line 64 of file qgsrastertransparency.cpp.

◆ setTransparentThreeValuePixelList()

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

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

See also: transparentThreeValuePixelList()

Definition at line 69 of file qgsrastertransparency.cpp.

◆ transparentSingleValuePixelList()

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

Returns the transparent single value pixel list.

See also: setTransparentSingleValuePixelList()

Definition at line 27 of file qgsrastertransparency.cpp.

◆ transparentThreeValuePixelList()

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

Returns the transparent three value pixel list.

See also: setTransparentThreeValuePixelList()

Definition at line 32 of file qgsrastertransparency.cpp.

◆ writeXml()

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

Writes the transparency information to an XML document.

Definition at line 147 of file qgsrastertransparency.cpp.

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

/tmp/buildd/qgis-3.6.0+99unstable/src/core/raster/qgsrastertransparency.h
/tmp/buildd/qgis-3.6.0+99unstable/src/core/raster/qgsrastertransparency.cpp

Classes

Public Member Functions