Gradient color ramp, which smoothly interpolates between two colors and also supports optional extra color stops. More...

#include <qgscolorrampimpl.h>

Inheritance diagram for QgsGradientColorRamp:

[legend]

Public Member Functions
	QgsGradientColorRamp (const QColor &color1=DEFAULT_GRADIENT_COLOR1, const QColor &color2=DEFAULT_GRADIENT_COLOR2, bool discrete=false, const QgsGradientStopsList &stops=QgsGradientStopsList())
	Constructor for QgsGradientColorRamp.

void	addStopsToGradient (QGradient *gradient, double opacity=1) const
	Copy color ramp stops to a QGradient.

QgsGradientColorRamp *	clone () const override
	Creates a clone of the color ramp.

QColor	color (double value) const override
	Returns the color corresponding to a specified value.

QColor	color1 () const
	Returns the gradient start color.

QColor	color2 () const
	Returns the gradient end color.

QColor::Spec	colorSpec () const
	Returns the color specification in which the color component interpolation will occur.

void	convertToDiscrete (bool discrete)
	Converts a gradient with existing color stops to or from discrete interpolation.

int	count () const override
	Returns number of defined colors, or -1 if undefined.

Qgis::AngularDirection	direction () const
	Returns the direction to traverse the color wheel using when interpolating hue-based color specifications.

QgsStringMap	info () const
	Returns any additional info attached to the gradient ramp (e.g., authorship notes)

void	invert () override
	Inverts the ordering of the color ramp.

bool	isDiscrete () const
	Returns `true` if the gradient is using discrete interpolation, rather than smoothly interpolating between colors.

QVariantMap	properties () const override
	Returns a string map containing all the color ramp's properties.

void	setColor1 (const QColor &color)
	Sets the gradient start color.

void	setColor2 (const QColor &color)
	Sets the gradient end color.

void	setColorSpec (QColor::Spec spec)
	Sets the color specification in which the color component interpolation will occur.

void	setDirection (Qgis::AngularDirection direction)
	Sets the direction to traverse the color wheel using when interpolating hue-based color specifications.

void	setDiscrete (bool discrete)
	Sets whether the gradient should use discrete interpolation, rather than smoothly interpolating between colors.

void	setInfo (const QgsStringMap &info)
	Sets additional info to attach to the gradient ramp (e.g., authorship notes)

void	setStops (const QgsGradientStopsList &stops)
	Sets the list of intermediate gradient stops for the ramp.

QgsGradientStopsList	stops () const
	Returns the list of intermediate gradient stops for the ramp.

QString	type () const override
	Returns a string representing the color ramp type.

double	value (int index) const override
	Returns relative value between [0,1] of color at specified index.

Public Member Functions inherited from QgsColorRamp
virtual	~QgsColorRamp ()

Static Public Member Functions
static QgsColorRamp *	create (const QVariantMap &properties=QVariantMap())
	Creates a new QgsColorRamp from a map of properties.

static QString	typeString ()
	Returns the string identifier for QgsGradientColorRamp.

Static Public Member Functions inherited from QgsColorRamp
static QList< QPair< QString, QString > >	rampTypes ()
	Returns a list of available ramp types, where the first value in each item is the QgsColorRamp::type() string and the second is a user friendly, translated name for the color ramp type.

Protected Attributes
QColor	mColor1

QColor	mColor2

QColor::Spec	mColorSpec = QColor::Spec::Rgb

Qgis::AngularDirection	mDirection = Qgis::AngularDirection::CounterClockwise

bool	mDiscrete

InterpolateColorFunc	mFunc = nullptr

QgsStringMap	mInfo

QgsGradientStopsList	mStops

Detailed Description

Gradient color ramp, which smoothly interpolates between two colors and also supports optional extra color stops.

Definition at line 134 of file qgscolorrampimpl.h.

Constructor & Destructor Documentation

◆ QgsGradientColorRamp()

QgsGradientColorRamp::QgsGradientColorRamp	(	const QColor &	color1 = `DEFAULT_GRADIENT_COLOR1`,
		const QColor &	color2 = `DEFAULT_GRADIENT_COLOR2`,
		bool	discrete = `false`,
		const QgsGradientStopsList &	stops = `QgsGradientStopsList()`
	)

Constructor for QgsGradientColorRamp.

Parameters

color1	start color, corresponding to a position of 0.0
color2	end color, corresponding to a position of 1.0
discrete	set to `true` for discrete interpolation instead of smoothly interpolating between colors
stops	optional list of additional color stops

Definition at line 237 of file qgscolorrampimpl.cpp.

Member Function Documentation

◆ addStopsToGradient()

void QgsGradientColorRamp::addStopsToGradient	(	QGradient *	gradient,
		double	opacity = `1`
	)		const

Copy color ramp stops to a QGradient.

Parameters

gradient	gradient to copy stops into
opacity	opacity multiplier. Opacity of colors will be multiplied by this factor before adding to the gradient.

Definition at line 572 of file qgscolorrampimpl.cpp.

◆ clone()

QgsGradientColorRamp * QgsGradientColorRamp::clone ( ) const

overridevirtual

Creates a clone of the color ramp.

Implements QgsColorRamp.

Definition at line 447 of file qgscolorrampimpl.cpp.

◆ color()

QColor QgsGradientColorRamp::color ( double value ) const

overridevirtual

Returns the color corresponding to a specified value.

Parameters

value value between [0, 1] inclusive

Returns: color for value

Implements QgsColorRamp.

Definition at line 348 of file qgscolorrampimpl.cpp.

◆ color1()

QColor QgsGradientColorRamp::color1 ( ) const

inline

Returns the gradient start color.

See also: setColor1(); color2()

Definition at line 175 of file qgscolorrampimpl.h.

◆ color2()

QColor QgsGradientColorRamp::color2 ( ) const

inline

Returns the gradient end color.

See also: setColor2(); color1()

Definition at line 182 of file qgscolorrampimpl.h.

◆ colorSpec()

QColor::Spec QgsGradientColorRamp::colorSpec ( ) const

inline

Returns the color specification in which the color component interpolation will occur.

For multi-stop gradients this color spec will be used for the portion of the color ramp leading into the final stop (i.e. color2()).

See also: setColorSpec()

Since: QGIS 3.24

Definition at line 270 of file qgscolorrampimpl.h.

◆ convertToDiscrete()

void QgsGradientColorRamp::convertToDiscrete ( bool discrete )

Converts a gradient with existing color stops to or from discrete interpolation.

Parameters

discrete set to true to convert the gradient stops to discrete, or false to convert them to smooth interpolation

See also: isDiscrete()

Definition at line 517 of file qgscolorrampimpl.cpp.

◆ count()

int QgsGradientColorRamp::count ( ) const

inlineoverridevirtual

Returns number of defined colors, or -1 if undefined.

Implements QgsColorRamp.

Definition at line 154 of file qgscolorrampimpl.h.

◆ create()

QgsColorRamp * QgsGradientColorRamp::create ( const QVariantMap & properties = QVariantMap() )

static

Creates a new QgsColorRamp from a map of properties.

Definition at line 247 of file qgscolorrampimpl.cpp.

◆ direction()

Qgis::AngularDirection QgsGradientColorRamp::direction ( ) const

inline

Returns the direction to traverse the color wheel using when interpolating hue-based color specifications.

For multi-stop gradients this direction will be used for the portion of the color ramp leading into the final stop (i.e. color2()).

See also: setDirection()

Since: QGIS 3.24

Definition at line 295 of file qgscolorrampimpl.h.

◆ info()

QgsStringMap QgsGradientColorRamp::info ( ) const

inline

Returns any additional info attached to the gradient ramp (e.g., authorship notes)

See also: setInfo()

Definition at line 244 of file qgscolorrampimpl.h.

◆ invert()

void QgsGradientColorRamp::invert ( )

overridevirtual

Inverts the ordering of the color ramp.

Reimplemented from QgsColorRamp.

Definition at line 399 of file qgscolorrampimpl.cpp.

◆ isDiscrete()

bool QgsGradientColorRamp::isDiscrete ( ) const

inline

Returns true if the gradient is using discrete interpolation, rather than smoothly interpolating between colors.

See also: setDiscrete()

Definition at line 205 of file qgscolorrampimpl.h.

◆ properties()

QVariantMap QgsGradientColorRamp::properties ( ) const

overridevirtual

Returns a string map containing all the color ramp's properties.

Implements QgsColorRamp.

Definition at line 457 of file qgscolorrampimpl.cpp.

◆ setColor1()

void QgsGradientColorRamp::setColor1 ( const QColor & color )

inline

Sets the gradient start color.

Parameters

color start color

See also: color1(); setColor2()

Definition at line 190 of file qgscolorrampimpl.h.

◆ setColor2()

void QgsGradientColorRamp::setColor2 ( const QColor & color )

inline

Sets the gradient end color.

Parameters

color end color

See also: color2(); setColor1()

Definition at line 198 of file qgscolorrampimpl.h.

◆ setColorSpec()

void QgsGradientColorRamp::setColorSpec ( QColor::Spec spec )

Sets the color specification in which the color component interpolation will occur.

Only QColor::Spec::Rgb, QColor::Spec::Hsv and QColor::Spec::Hsl are currently supported.

For multi-stop gradients this color spec will be used for the portion of the color ramp leading into the final stop (i.e. color2()).

See also: colorSpec()

Since: QGIS 3.24

Definition at line 627 of file qgscolorrampimpl.cpp.

◆ setDirection()

void QgsGradientColorRamp::setDirection ( Qgis::AngularDirection direction )

inline

Sets the direction to traverse the color wheel using when interpolating hue-based color specifications.

For multi-stop gradients this direction will be used for the portion of the color ramp leading into the final stop (i.e. color2()).

See also: direction()

Since: QGIS 3.24

Definition at line 307 of file qgscolorrampimpl.h.

◆ setDiscrete()

void QgsGradientColorRamp::setDiscrete ( bool discrete )

inline

Sets whether the gradient should use discrete interpolation, rather than smoothly interpolating between colors.

Parameters

discrete set to true to use discrete interpolation

See also: convertToDiscrete(); isDiscrete()

Definition at line 214 of file qgscolorrampimpl.h.

◆ setInfo()

void QgsGradientColorRamp::setInfo ( const QgsStringMap & info )

inline

Sets additional info to attach to the gradient ramp (e.g., authorship notes)

Parameters

info	map of string info to attach

See also: info()

Definition at line 251 of file qgscolorrampimpl.h.

◆ setStops()

void QgsGradientColorRamp::setStops ( const QgsGradientStopsList & stops )

Sets the list of intermediate gradient stops for the ramp.

Parameters

stops list of stops. Any existing color stops will be replaced. The stop list will be automatically reordered so that stops are listed in ascending offset order.

See also: stops()

Definition at line 564 of file qgscolorrampimpl.cpp.

◆ stops()

QgsGradientStopsList QgsGradientColorRamp::stops ( ) const

inline

Returns the list of intermediate gradient stops for the ramp.

See also: setStops()

Definition at line 238 of file qgscolorrampimpl.h.

◆ type()

QString QgsGradientColorRamp::type ( ) const

overridevirtual

Returns a string representing the color ramp type.

Implements QgsColorRamp.

Definition at line 394 of file qgscolorrampimpl.cpp.

◆ typeString()

static QString QgsGradientColorRamp::typeString ( )

inlinestatic

Returns the string identifier for QgsGradientColorRamp.

Since: QGIS 3.16

Definition at line 163 of file qgscolorrampimpl.h.

◆ value()

double QgsGradientColorRamp::value ( int index ) const

overridevirtual

Returns relative value between [0,1] of color at specified index.

Implements QgsColorRamp.

Definition at line 332 of file qgscolorrampimpl.cpp.

Member Data Documentation

◆ mColor1

QColor QgsGradientColorRamp::mColor1

protected

Definition at line 310 of file qgscolorrampimpl.h.

◆ mColor2

QColor QgsGradientColorRamp::mColor2

protected

Definition at line 311 of file qgscolorrampimpl.h.

◆ mColorSpec

QColor::Spec QgsGradientColorRamp::mColorSpec = QColor::Spec::Rgb

protected

Definition at line 315 of file qgscolorrampimpl.h.

◆ mDirection

Qgis::AngularDirection QgsGradientColorRamp::mDirection = Qgis::AngularDirection::CounterClockwise

protected

Definition at line 316 of file qgscolorrampimpl.h.

◆ mDiscrete

bool QgsGradientColorRamp::mDiscrete

protected

Definition at line 312 of file qgscolorrampimpl.h.

◆ mFunc

InterpolateColorFunc QgsGradientColorRamp::mFunc = nullptr

protected

Definition at line 318 of file qgscolorrampimpl.h.

◆ mInfo

QgsStringMap QgsGradientColorRamp::mInfo

protected

Definition at line 314 of file qgscolorrampimpl.h.

◆ mStops

QgsGradientStopsList QgsGradientColorRamp::mStops

protected

Definition at line 313 of file qgscolorrampimpl.h.

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

/build/qgis-3.99.0+git20250718+f78f5286a64+99sid/src/core/qgscolorrampimpl.h
/build/qgis-3.99.0+git20250718+f78f5286a64+99sid/src/core/qgscolorrampimpl.cpp

Public Member Functions

Static Public Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ QgsGradientColorRamp()

Member Function Documentation

◆ addStopsToGradient()

◆ clone()

◆ color()

◆ color1()

◆ color2()

◆ colorSpec()

◆ convertToDiscrete()

◆ count()

◆ create()

◆ direction()

◆ info()

◆ invert()

◆ isDiscrete()

◆ properties()

◆ setColor1()

◆ setColor2()

◆ setColorSpec()

◆ setDirection()

◆ setDiscrete()

◆ setInfo()

◆ setStops()

◆ stops()

◆ type()

◆ typeString()

◆ value()

Member Data Documentation

◆ mColor1

◆ mColor2

◆ mColorSpec

◆ mDirection

◆ mDiscrete

◆ mFunc

◆ mInfo

◆ mStops