A ramp shader will color a raster pixel based on a list of values ranges in a ramp. More...

#include <qgscolorrampshader.h>

Inheritance diagram for QgsColorRampShader:

Classes
struct	ColorRampItem

Public Member Functions
	QgsColorRampShader (const QgsColorRampShader &other)

	QgsColorRampShader (double minimumValue=0.0, double maximumValue=255.0, QgsColorRamp *colorRamp=nullptr, Qgis::ShaderInterpolationMethod type=Qgis::ShaderInterpolationMethod::Linear, Qgis::ShaderClassificationMethod classificationMode=Qgis::ShaderClassificationMethod::Continuous)
	Creates a new color ramp shader.

	~QgsColorRampShader () override

Qgis::ShaderClassificationMethod	classificationMode () const
	Returns the classification mode.

void	classifyColorRamp (int band=-1, const QgsRectangle &extent=QgsRectangle(), QgsRasterInterface *input=nullptr)
	Classify color ramp shader.

void	classifyColorRamp (int classes=0, int band=-1, const QgsRectangle &extent=QgsRectangle(), QgsRasterInterface *input=nullptr)
	Classify color ramp shader.

bool	clip () const
	Returns whether the shader will clip values which are out of range.

QList< QgsColorRampShader::ColorRampItem >	colorRampItemList () const
	Returns the custom color map.

Qgis::ShaderInterpolationMethod	colorRampType () const
	Returns the color ramp interpolation method.

QString	colorRampTypeAsQString () const
	Returns the color ramp type as a string.

QgsColorRamp *	createColorRamp () const
	Creates a gradient color ramp from shader settings.

bool	isEmpty () const
	Whether the color ramp contains any items.

const QgsColorRampLegendNodeSettings *	legendSettings () const
	Returns the color ramp shader legend settings.

void	legendSymbologyItems (QList< QPair< QString, QColor > > &symbolItems) const override
	Returns legend symbology items if provided by renderer.

QgsColorRampShader &	operator= (const QgsColorRampShader &other)

bool	operator== (const QgsColorRampShader &other) const

void	readXml (const QDomElement &elem, const QgsReadWriteContext &context=QgsReadWriteContext())
	Reads configuration from the given DOM element.

void	setClassificationMode (Qgis::ShaderClassificationMethod classificationMode)
	Sets the classification mode.

void	setClip (bool clip)
	Sets whether the shader should not render values out of range.

void	setColorRampItemList (const QList< QgsColorRampShader::ColorRampItem > &list)
	Sets a custom color map.

void	setColorRampType (const QString &type)
	Sets the color ramp type.

void	setColorRampType (Qgis::ShaderInterpolationMethod colorRampType)
	Sets the color ramp interpolation method.

void	setLegendSettings (QgsColorRampLegendNodeSettings *settings)
	Sets the color ramp shader legend settings.

void	setSourceColorRamp (QgsColorRamp *colorramp)
	Set the source color ramp.

bool	shade (double redValue, double greenValue, double blueValue, double alphaValue, int returnRedValue, int returnGreenValue, int returnBlueValue, int returnAlphaValue) const override
	Generates an new RGBA value based on an original RGBA value.

bool	shade (double value, int returnRedValue, int returnGreenValue, int returnBlueValue, int returnAlphaValue) const override
	Generates an new RGBA value based on one input value.

QgsColorRamp *	sourceColorRamp () const
	Returns the source color ramp.

QDomElement	writeXml (QDomDocument &doc, const QgsReadWriteContext &context=QgsReadWriteContext()) const
	Writes configuration to a new DOM element.

Public Member Functions inherited from QgsRasterShaderFunction
	QgsRasterShaderFunction (double minimumValue=0.0, double maximumValue=255.0)

virtual	~QgsRasterShaderFunction ()=default

int	labelPrecision () const
	Returns label precision.

double	maximumValue () const
	Returns the minimum value for the raster shader.

double	minimumMaximumRange () const

double	minimumValue () const
	Returns the maximum value for the raster shader.

void	setLabelPrecision (int labelPrecision)
	Sets label precision to labelPrecision.

virtual void	setMaximumValue (double value)
	Sets the maximum value for the raster shader.

virtual void	setMinimumValue (double value)
	Sets the minimum value for the raster shader.

Protected Attributes
std::unique_ptr< QgsColorRamp >	mSourceColorRamp
	Source color ramp.

Protected Attributes inherited from QgsRasterShaderFunction
int	mLabelPrecision = 6
	Label precision.

double	mMaximumValue
	User defineable maximum value for the shading function.

double	mMinimumMaximumRange
	Minimum maximum range for the shading function.

double	mMinimumValue
	User defineable minimum value for the shading function.

Detailed Description

A ramp shader will color a raster pixel based on a list of values ranges in a ramp.

Definition at line 43 of file qgscolorrampshader.h.

Constructor & Destructor Documentation

◆ QgsColorRampShader() [1/2]

QgsColorRampShader::QgsColorRampShader	(	double	minimumValue = `0.0`,
		double	maximumValue = `255.0`,
		QgsColorRamp *	colorRamp = `nullptr`,
		Qgis::ShaderInterpolationMethod	type = `Qgis::ShaderInterpolationMethod::Linear`,
		Qgis::ShaderClassificationMethod	classificationMode = `Qgis::ShaderClassificationMethod::Continuous`
	)

Creates a new color ramp shader.

Parameters

minimumValue	minimum value for the raster shader
maximumValue	maximum value for the raster shader
type	interpolation type used
classificationMode	method used to classify the color ramp shader
colorRamp	vector color ramp used to classify the color ramp shader. Ownership is transferred to the shader.

Definition at line 35 of file qgscolorrampshader.cpp.

◆ ~QgsColorRampShader()

QgsColorRampShader::~QgsColorRampShader ( )

overridedefault

◆ QgsColorRampShader() [2/2]

QgsColorRampShader::QgsColorRampShader ( const QgsColorRampShader & other )

Definition at line 48 of file qgscolorrampshader.cpp.

Member Function Documentation

◆ classificationMode()

Qgis::ShaderClassificationMethod QgsColorRampShader::classificationMode ( ) const

inline

Returns the classification mode.

See also: setClassificationMode()

Definition at line 214 of file qgscolorrampshader.h.

◆ classifyColorRamp() [1/2]

void QgsColorRampShader::classifyColorRamp	(	int	band = `-1`,
		const QgsRectangle &	extent = `QgsRectangle()`,
		QgsRasterInterface *	input = `nullptr`
	)

Classify color ramp shader.

Parameters

band	raster band used in classification (quantile mode only)
extent	extent used in classification (quantile mode only)
input	raster input used in classification (quantile mode only)

Definition at line 375 of file qgscolorrampshader.cpp.

◆ classifyColorRamp() [2/2]

void QgsColorRampShader::classifyColorRamp	(	int	classes = `0`,
		int	band = `-1`,
		const QgsRectangle &	extent = `QgsRectangle()`,
		QgsRasterInterface *	input = `nullptr`
	)

Classify color ramp shader.

Parameters

classes	number of classes
band	raster band used in classification (only used in quantile mode)
extent	extent used in classification (only used in quantile mode)
input	raster input used in classification (only used in quantile mode)

Definition at line 186 of file qgscolorrampshader.cpp.

◆ clip()

bool QgsColorRampShader::clip ( ) const

inline

Returns whether the shader will clip values which are out of range.

See also: setClip()

Definition at line 227 of file qgscolorrampshader.h.

◆ colorRampItemList()

QList< QgsColorRampShader::ColorRampItem > QgsColorRampShader::colorRampItemList ( ) const

inline

Returns the custom color map.

See also: setColorRampItemList()

Definition at line 113 of file qgscolorrampshader.h.

◆ colorRampType()

Qgis::ShaderInterpolationMethod QgsColorRampShader::colorRampType ( ) const

inline

Returns the color ramp interpolation method.

See also: setColorRampType()

Definition at line 120 of file qgscolorrampshader.h.

◆ colorRampTypeAsQString()

QString QgsColorRampShader::colorRampTypeAsQString ( ) const

Returns the color ramp type as a string.

Definition at line 84 of file qgscolorrampshader.cpp.

◆ createColorRamp()

QgsColorRamp * QgsColorRampShader::createColorRamp ( ) const

Creates a gradient color ramp from shader settings.

Since: QGIS 3.18

Definition at line 137 of file qgscolorrampshader.cpp.

◆ isEmpty()

bool QgsColorRampShader::isEmpty ( ) const

Whether the color ramp contains any items.

Since: QGIS 3.4

Definition at line 111 of file qgscolorrampshader.cpp.

◆ legendSettings()

const QgsColorRampLegendNodeSettings * QgsColorRampShader::legendSettings ( ) const

Returns the color ramp shader legend settings.

See also: setLegendSettings()

Since: QGIS 3.18

Definition at line 640 of file qgscolorrampshader.cpp.

◆ legendSymbologyItems()

void QgsColorRampShader::legendSymbologyItems ( QList< QPair< QString, QColor > > & symbolItems ) const

overridevirtual

Returns legend symbology items if provided by renderer.

Reimplemented from QgsRasterShaderFunction.

Definition at line 553 of file qgscolorrampshader.cpp.

◆ operator=()

QgsColorRampShader & QgsColorRampShader::operator= ( const QgsColorRampShader & other )

Definition at line 64 of file qgscolorrampshader.cpp.

◆ operator==()

bool QgsColorRampShader::operator== ( const QgsColorRampShader & other ) const

inline

Definition at line 63 of file qgscolorrampshader.h.

◆ readXml()

void QgsColorRampShader::readXml	(	const QDomElement &	elem,
		const QgsReadWriteContext &	context = `QgsReadWriteContext()`
	)

Reads configuration from the given DOM element.

Since: QGIS 3.4

Definition at line 598 of file qgscolorrampshader.cpp.

◆ setClassificationMode()

void QgsColorRampShader::setClassificationMode ( Qgis::ShaderClassificationMethod classificationMode )

inline

Sets the classification mode.

See also: classificationMode()

Definition at line 207 of file qgscolorrampshader.h.

◆ setClip()

void QgsColorRampShader::setClip ( bool clip )

inline

Sets whether the shader should not render values out of range.

Parameters

clip	set to `true` to clip values which are out of range.

See also: clip()

Definition at line 221 of file qgscolorrampshader.h.

◆ setColorRampItemList()

void QgsColorRampShader::setColorRampItemList ( const QList< QgsColorRampShader::ColorRampItem > & list )

Sets a custom color map.

See also: colorRampItemList()

Definition at line 98 of file qgscolorrampshader.cpp.

◆ setColorRampType() [1/2]

void QgsColorRampShader::setColorRampType ( const QString & type )

Sets the color ramp type.

Definition at line 116 of file qgscolorrampshader.cpp.

◆ setColorRampType() [2/2]

void QgsColorRampShader::setColorRampType ( Qgis::ShaderInterpolationMethod colorRampType )

Sets the color ramp interpolation method.

See also: colorRampType()

Definition at line 106 of file qgscolorrampshader.cpp.

◆ setLegendSettings()

void QgsColorRampShader::setLegendSettings ( QgsColorRampLegendNodeSettings * settings )

Sets the color ramp shader legend settings.

Ownership of settings is transferred.

See also: legendSettings()

Since: QGIS 3.18

Definition at line 645 of file qgscolorrampshader.cpp.

◆ setSourceColorRamp()

void QgsColorRampShader::setSourceColorRamp ( QgsColorRamp * colorramp )

Set the source color ramp.

Ownership is transferred to the shader.

See also: sourceColorRamp()

Definition at line 181 of file qgscolorrampshader.cpp.

◆ shade() [1/2]

bool QgsColorRampShader::shade	(	double	redValue,
		double	greenValue,
		double	blueValue,
		double	alphaValue,
		int *	returnRedValue,
		int *	returnGreenValue,
		int *	returnBlueValue,
		int *	returnAlpha
	)		const

overridevirtual

Generates an new RGBA value based on an original RGBA value.

Parameters

redValue	The red component of the original value to base a new RGBA value on
greenValue	The green component of the original value to base a new RGBA value on
blueValue	The blue component of the original value to base a new RGBA value on
alphaValue	The alpha component of the original value to base a new RGBA value on
returnRedValue	The red component of the new RGBA value
returnGreenValue	The green component of the new RGBA value
returnBlueValue	The blue component of the new RGBA value
returnAlpha	The alpha component of the new RGBA value

Returns: true if the return values are valid otherwise false

Reimplemented from QgsRasterShaderFunction.

Definition at line 535 of file qgscolorrampshader.cpp.

◆ shade() [2/2]

bool QgsColorRampShader::shade	(	double	value,
		int *	returnRedValue,
		int *	returnGreenValue,
		int *	returnBlueValue,
		int *	returnAlpha
	)		const

overridevirtual

Generates an new RGBA value based on one input value.

Parameters

value	The original value to base a new RGBA value on
returnRedValue	The red component of the new RGBA value
returnGreenValue	The green component of the new RGBA value
returnBlueValue	The blue component of the new RGBA value
returnAlpha	The alpha component of the new RGBA value

Returns: true if the return values are valid otherwise false

Reimplemented from QgsRasterShaderFunction.

Definition at line 380 of file qgscolorrampshader.cpp.

◆ sourceColorRamp()

QgsColorRamp * QgsColorRampShader::sourceColorRamp ( ) const

Returns the source color ramp.

See also: setSourceColorRamp()

Definition at line 132 of file qgscolorrampshader.cpp.

◆ writeXml()

QDomElement QgsColorRampShader::writeXml	(	QDomDocument &	doc,
		const QgsReadWriteContext &	context = `QgsReadWriteContext()`
	)		const

Writes configuration to a new DOM element.

Since: QGIS 3.4

Definition at line 562 of file qgscolorrampshader.cpp.

Member Data Documentation

◆ mSourceColorRamp

std::unique_ptr<QgsColorRamp> QgsColorRampShader::mSourceColorRamp

protected

Source color ramp.

Definition at line 250 of file qgscolorrampshader.h.

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

/build/qgis-3.41.0+git20241119+45a0abf3bec+99sid/src/core/raster/qgscolorrampshader.h
/build/qgis-3.41.0+git20241119+45a0abf3bec+99sid/src/core/raster/qgscolorrampshader.cpp

Classes

Public Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ QgsColorRampShader() [1/2]

◆ ~QgsColorRampShader()

◆ QgsColorRampShader() [2/2]

Member Function Documentation

◆ classificationMode()

◆ classifyColorRamp() [1/2]

◆ classifyColorRamp() [2/2]

◆ clip()

◆ colorRampItemList()

◆ colorRampType()

◆ colorRampTypeAsQString()

◆ createColorRamp()

◆ isEmpty()

◆ legendSettings()

◆ legendSymbologyItems()

◆ operator=()

◆ operator==()

◆ readXml()

◆ setClassificationMode()

◆ setClip()

◆ setColorRampItemList()

◆ setColorRampType() [1/2]

◆ setColorRampType() [2/2]

◆ setLegendSettings()

◆ setSourceColorRamp()

◆ shade() [1/2]

◆ shade() [2/2]

◆ sourceColorRamp()

◆ writeXml()

Member Data Documentation

◆ mSourceColorRamp