Superclass for mapping scalar values to colors. More...

#include <vtkScalarsToColors.h>

Inheritance diagram for vtkScalarsToColors:

Collaboration diagram for vtkScalarsToColors:

Public Types
enum	VectorModes { MAGNITUDE = 0 , COMPONENT = 1 , RGBCOLORS = 2 }

typedef vtkObject	Superclass

Public Member Functions
virtual vtkTypeBool	IsA (const char *type)
	Return 1 if this class is the same type of (or a subclass of) the named class.

vtkScalarsToColors *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses.

virtual void	Build ()
	Perform any processing required (if any) before processing scalars.

virtual const unsigned char *	MapValue (double v)
	Map one value through the lookup table and return a color defined as an RGBA unsigned char tuple (4 bytes).

virtual void	GetColor (double v, double rgb[3])
	Map one value through the lookup table and store the color as an RGB array of doubles between 0 and 1 in the rgb argument.

double *	GetColor (double v)
	Map one value through the lookup table and return the color as an RGB array of doubles between 0 and 1.

virtual double	GetOpacity (double v)
	Map one value through the lookup table and return the alpha value (the opacity) as a double between 0 and 1.

double	GetLuminance (double x)
	Map one value through the lookup table and return the luminance 0.3red + 0.59green + 0.11*blue as a double between 0 and 1.

void	MapVectorsThroughTable (void input, unsigned char output, int inputDataType, int numberOfValues, int inputIncrement, int outputFormat, int vectorComponent, int vectorSize)
	Map vectors through the lookup table.

void	MapVectorsThroughTable (void input, unsigned char output, int inputDataType, int numberOfValues, int inputIncrement, int outputFormat)

void	MapScalarsThroughTable (vtkDataArray scalars, unsigned char output, int outputFormat)
	Map a set of scalars through the lookup table in a single operation.

void	MapScalarsThroughTable (vtkDataArray scalars, unsigned char output)

void	MapScalarsThroughTable (void input, unsigned char output, int inputDataType, int numberOfValues, int inputIncrement, int outputFormat)

virtual void	MapScalarsThroughTable2 (void input, unsigned char output, int inputDataType, int numberOfValues, int inputIncrement, int outputFormat)
	An internal method typically not used in applications.

virtual void	DeepCopy (vtkScalarsToColors *o)
	Copy the contents from another object.

virtual vtkTypeBool	UsingLogScale ()
	This should return 1 if the subclass is using log scale for mapping scalars to colors.

virtual vtkIdType	GetNumberOfAvailableColors ()
	Get the number of available colors for mapping to.

virtual vtkIdType	SetAnnotation (vtkVariant value, vtkStdString annotation)
	Add a new entry (or change an existing entry) to the list of annotated values.

virtual vtkIdType	SetAnnotation (vtkStdString value, vtkStdString annotation)
	This variant of SetAnnotation accepts the value as a string so ParaView can treat annotations as string vector arrays.

vtkIdType	GetNumberOfAnnotatedValues ()
	Return the annotated value at a particular index in the list of annotations.

vtkVariant	GetAnnotatedValue (vtkIdType idx)
	Return the annotated value at a particular index in the list of annotations.

vtkStdString	GetAnnotation (vtkIdType idx)
	Return the annotation at a particular index in the list of annotations.

virtual void	GetAnnotationColor (const vtkVariant &val, double rgba[4])
	Obtain the color associated with a particular annotated value (or NanColor if unmatched).

vtkIdType	GetAnnotatedValueIndex (vtkVariant val)
	Return the index of the given value in the list of annotated values (or -1 if not present).

vtkIdType	GetAnnotatedValueIndexInternal (const vtkVariant &val)
	Look up an index into the array of annotations given a value.

virtual void	GetIndexedColor (vtkIdType i, double rgba[4])
	Get the "indexed color" assigned to an index.

virtual bool	RemoveAnnotation (vtkVariant value)
	Remove an existing entry from the list of annotated values.

virtual void	ResetAnnotations ()
	Remove all existing values and their annotations.


virtual vtkTypeBool	IsOpaque ()
	Return true if all of the values defining the mapping have an opacity equal to 1.

virtual vtkTypeBool	IsOpaque (vtkAbstractArray *scalars, int colorMode, int component)
	Return true if all of the values defining the mapping have an opacity equal to 1.

virtual vtkTypeBool	IsOpaque (vtkAbstractArray scalars, int colorMode, int component, vtkUnsignedCharArray ghosts, unsigned char ghostsToSkip=0xff)
	Return true if all of the values defining the mapping have an opacity equal to 1.


virtual double *	GetRange ()
	Sets/Gets the range of scalars that will be mapped.

virtual void	SetRange (double min, double max)
	Sets/Gets the range of scalars that will be mapped.

virtual void	SetRange (const double rng[2])
	Sets/Gets the range of scalars that will be mapped.


virtual void	SetAlpha (double alpha)
	Specify an additional opacity (alpha) value to blend with.

virtual double	GetAlpha ()
	Specify an additional opacity (alpha) value to blend with.


virtual vtkUnsignedCharArray *	MapScalars (vtkDataArray *scalars, int colorMode, int component, int outputFormat=VTK_RGBA)
	Internal methods that map a data array into an unsigned char array.

virtual vtkUnsignedCharArray *	MapScalars (vtkAbstractArray *scalars, int colorMode, int component, int outputFormat=VTK_RGBA)
	Internal methods that map a data array into an unsigned char array.


virtual void	SetVectorMode (int)
	Change mode that maps vectors by magnitude vs.

virtual int	GetVectorMode ()
	Change mode that maps vectors by magnitude vs.

void	SetVectorModeToMagnitude ()
	Change mode that maps vectors by magnitude vs.

void	SetVectorModeToComponent ()
	Change mode that maps vectors by magnitude vs.

void	SetVectorModeToRGBColors ()
	Change mode that maps vectors by magnitude vs.


virtual void	SetVectorComponent (int)
	If the mapper does not select which component of a vector to map to colors, you can specify it here.

virtual int	GetVectorComponent ()
	If the mapper does not select which component of a vector to map to colors, you can specify it here.


virtual void	SetVectorSize (int)
	When mapping vectors, consider only the number of components selected by VectorSize to be part of the vector, and ignore any other components.

virtual int	GetVectorSize ()
	When mapping vectors, consider only the number of components selected by VectorSize to be part of the vector, and ignore any other components.


virtual void	SetAnnotations (vtkAbstractArray values, vtkStringArray annotations)
	Set a list of discrete values, either as a categorical set of values (when IndexedLookup is true) or as a set of annotations to add to a scalar array (when IndexedLookup is false).

virtual vtkAbstractArray *	GetAnnotatedValues ()
	Set a list of discrete values, either as a categorical set of values (when IndexedLookup is true) or as a set of annotations to add to a scalar array (when IndexedLookup is false).

virtual vtkStringArray *	GetAnnotations ()
	Set a list of discrete values, either as a categorical set of values (when IndexedLookup is true) or as a set of annotations to add to a scalar array (when IndexedLookup is false).


virtual void	SetIndexedLookup (vtkTypeBool)
	Set/get whether the lookup table is for categorical or ordinal data.

virtual vtkTypeBool	GetIndexedLookup ()
	Set/get whether the lookup table is for categorical or ordinal data.

virtual void	IndexedLookupOn ()
	Set/get whether the lookup table is for categorical or ordinal data.

virtual void	IndexedLookupOff ()
	Set/get whether the lookup table is for categorical or ordinal data.


template<>
unsigned char	ColorToUChar (double t)
	Specializations of vtkScalarsToColors::ColorToUChar Converts from a color in a floating point type in range 0.0-1.0 to a uchar in range 0-255.

template<>
unsigned char	ColorToUChar (float t)
	Specializations of vtkScalarsToColors::ColorToUChar Converts from a color in a floating point type in range 0.0-1.0 to a uchar in range 0-255.

Public Member Functions inherited from vtkObject
	vtkBaseTypeMacro (vtkObject, vtkObjectBase)

virtual void	DebugOn ()
	Turn debugging output on.

virtual void	DebugOff ()
	Turn debugging output off.

bool	GetDebug ()
	Get the value of the debug flag.

void	SetDebug (bool debugFlag)
	Set the value of the debug flag.

virtual void	Modified ()
	Update the modification time for this object.

virtual vtkMTimeType	GetMTime ()
	Return this object's modified time.

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses.

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

vtkTypeBool	HasObserver (unsigned long event)

vtkTypeBool	HasObserver (const char *event)

vtkTypeBool	InvokeEvent (unsigned long event)

vtkTypeBool	InvokeEvent (const char *event)

std::string	GetObjectDescription () const override
	The object description printed in messages and PrintSelf output.

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

vtkCommand *	GetCommand (unsigned long tag)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

void	RemoveObserver (vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

void	RemoveObservers (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

void	RemoveObservers (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

vtkTypeBool	HasObserver (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

vtkTypeBool	HasObserver (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object.

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events.

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events.

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Allow user to set the AbortFlagOn() with the return value of the callback method.

vtkTypeBool	InvokeEvent (unsigned long event, void *callData)
	This method invokes an event and return whether the event was aborted or not.

vtkTypeBool	InvokeEvent (const char event, void callData)
	This method invokes an event and return whether the event was aborted or not.

virtual void	SetObjectName (const std::string &objectName)
	Set/get the name of this object for reporting purposes.

virtual std::string	GetObjectName () const
	Set/get the name of this object for reporting purposes.

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const
	Return the class name as a string.

virtual std::string	GetObjectDescription () const
	The object description printed in messages and PrintSelf output.

virtual vtkTypeBool	IsA (const char *name)
	Return 1 if this class is the same type of (or a subclass of) the named class.

virtual vtkIdType	GetNumberOfGenerationsFromBase (const char *name)
	Given the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class).

virtual void	Delete ()
	Delete a VTK object.

virtual void	FastDelete ()
	Delete a reference to this object.

void	InitializeObjectBase ()

void	Print (ostream &os)
	Print an object to an ostream.

void	Register (vtkObjectBase *o)
	Increase the reference count (mark as used by another object).

virtual void	UnRegister (vtkObjectBase *o)
	Decrease the reference count (release by another object).

int	GetReferenceCount ()
	Return the current reference count of this object.

void	SetReferenceCount (int)
	Sets the reference count.

bool	GetIsInMemkind () const
	A local state flag that remembers whether this object lives in the normal or extended memory space.

virtual void	PrintHeader (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses.

virtual void	PrintTrailer (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses.

virtual bool	UsesGarbageCollector () const
	Indicate whether the class uses `vtkGarbageCollector` or not.

Static Public Member Functions
static vtkTypeBool	IsTypeOf (const char *type)

static vtkScalarsToColors *	SafeDownCast (vtkObjectBase *o)

static vtkScalarsToColors *	New ()


template<typename T >
static unsigned char	ColorToUChar (T t)
	Converts a color from numeric type T to uchar.

template<typename T >
static void	ColorToUChar (T t, unsigned char *dest)
	Converts a color from numeric type T to uchar.

Static Public Member Functions inherited from vtkObject
static vtkObject *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

static void	BreakOnError ()
	This method is called when vtkErrorMacro executes.

static void	SetGlobalWarningDisplay (vtkTypeBool val)
	This is a global flag that controls whether any debug, warning or error messages are displayed.

static void	GlobalWarningDisplayOn ()
	This is a global flag that controls whether any debug, warning or error messages are displayed.

static void	GlobalWarningDisplayOff ()
	This is a global flag that controls whether any debug, warning or error messages are displayed.

static vtkTypeBool	GetGlobalWarningDisplay ()
	This is a global flag that controls whether any debug, warning or error messages are displayed.

Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool	IsTypeOf (const char *name)
	Return 1 if this class type is the same type of (or a subclass of) the named class.

static vtkIdType	GetNumberOfGenerationsFromBaseType (const char *name)
	Given a the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class).

static vtkObjectBase *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

static void	SetMemkindDirectory (const char *directoryname)
	The name of a directory, ideally mounted -o dax, to memory map an extended memory space within.

static bool	GetUsingMemkind ()
	A global state flag that controls whether vtkObjects are constructed in the usual way (the default) or within the extended memory space.

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkScalarsToColors ()

	~vtkScalarsToColors () override

void	MapColorsToColors (void input, unsigned char output, int inputDataType, int numberOfValues, int numberOfComponents, int vectorSize, int outputFormat)
	An internal method that assumes that the input already has the right colors, and only remaps the range to [0,255] and pads to the desired output format.

vtkUnsignedCharArray *	ConvertToRGBA (vtkDataArray *colors, int numComp, int numTuples)
	An internal method used to convert a color array to RGBA.

void	MapVectorsToMagnitude (void input, double output, int inputDataType, int numberOfValues, int numberOfComponents, int vectorSize)
	An internal method for converting vectors to magnitudes, used as a preliminary step before doing magnitude mapping.

virtual vtkIdType	CheckForAnnotatedValue (vtkVariant value)
	Allocate annotation arrays if needed, then return the index of the given value or -1 if not present.

virtual void	UpdateAnnotatedValueMap ()
	Update the map from annotated values to indices in the array of annotations.

Protected Member Functions inherited from vtkObject
	vtkObject ()

	~vtkObject () override

void	RegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=nullptr)
	These methods allow a command to exclusively grab all events.

void	InternalReleaseFocus ()
	These methods allow a command to exclusively grab all events.

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	RegisterInternal (vtkObjectBase *, vtkTypeBool check)

virtual void	UnRegisterInternal (vtkObjectBase *, vtkTypeBool check)

virtual void	ReportReferences (vtkGarbageCollector *)

virtual void	ObjectFinalize ()

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
vtkAbstractArray *	AnnotatedValues

vtkStringArray *	Annotations

vtkInternalAnnotatedValueList *	AnnotatedValueList

vtkTypeBool	IndexedLookup

double	Alpha

int	VectorMode

int	VectorComponent

int	VectorSize

int	UseMagnitude

unsigned char	RGBABytes [4]

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

std::string	ObjectName

Protected Attributes inherited from vtkObjectBase
std::atomic< int32_t >	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Additional Inherited Members
Static Protected Member Functions inherited from vtkObjectBase
static vtkMallocingFunction	GetCurrentMallocFunction ()

static vtkReallocingFunction	GetCurrentReallocFunction ()

static vtkFreeingFunction	GetCurrentFreeFunction ()

static vtkFreeingFunction	GetAlternateFreeFunction ()

Detailed Description

Superclass for mapping scalar values to colors.

vtkScalarsToColors is a general-purpose base class for objects that convert scalars to colors. This include vtkLookupTable classes and color transfer functions. By itself, this class will simply rescale the scalars.

The scalar-to-color mapping can be augmented with an additional uniform alpha blend. This is used, for example, to blend a vtkActor's opacity with the lookup table values.

Specific scalar values may be annotated with text strings that will be included in color legends using SetAnnotations, SetAnnotation, GetNumberOfAnnotatedValues, GetAnnotatedValue, GetAnnotation, RemoveAnnotation, and ResetAnnotations.

This class also has a method for indicating that the set of annotated values form a categorical color map; by setting IndexedLookup to true, you indicate that the annotated values are the only valid values for which entries in the color table should be returned. In this mode, subclasses should then assign colors to annotated values by taking the modulus of an annotated value's index in the list of annotations with the number of colors in the table.

See also: vtkLookupTable vtkColorTransferFunction

Examples:: vtkScalarsToColors (Examples)

Online Examples:

ExportPolyDataScene

Tests:: vtkScalarsToColors (Tests)

Definition at line 75 of file vtkScalarsToColors.h.

Member Typedef Documentation

◆ Superclass

typedef vtkObject vtkScalarsToColors::Superclass

Definition at line 78 of file vtkScalarsToColors.h.

Member Enumeration Documentation

◆ VectorModes

enum vtkScalarsToColors::VectorModes

Enumerator
MAGNITUDE
COMPONENT
RGBCOLORS

Definition at line 200 of file vtkScalarsToColors.h.

Constructor & Destructor Documentation

◆ vtkScalarsToColors()

vtkScalarsToColors::vtkScalarsToColors ( )

protected

◆ ~vtkScalarsToColors()

vtkScalarsToColors::~vtkScalarsToColors ( )

overrideprotected

Member Function Documentation

◆ IsTypeOf()

static vtkTypeBool vtkScalarsToColors::IsTypeOf ( const char * type )

static

◆ IsA()

virtual vtkTypeBool vtkScalarsToColors::IsA ( const char * name )

virtual

Return 1 if this class is the same type of (or a subclass of) the named class.

Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObjectBase.

Reimplemented in vtkLookupTable, vtkColorTransferFunction, vtkDiscretizableColorTransferFunction, vtkLogLookupTable, vtkLookupTableWithEnabling, and vtkWindowLevelLookupTable.

◆ SafeDownCast()

static vtkScalarsToColors * vtkScalarsToColors::SafeDownCast ( vtkObjectBase * o )

static

◆ NewInstanceInternal()

virtual vtkObjectBase * vtkScalarsToColors::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented in vtkLookupTable, vtkColorTransferFunction, vtkDiscretizableColorTransferFunction, vtkLogLookupTable, vtkLookupTableWithEnabling, and vtkWindowLevelLookupTable.

◆ NewInstance()

vtkScalarsToColors * vtkScalarsToColors::NewInstance ( ) const

◆ PrintSelf()

void vtkScalarsToColors::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)

overridevirtual

Methods invoked by print to print information about the object including superclasses.

Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkObject.

Reimplemented in vtkWindowLevelLookupTable.

◆ New()

static vtkScalarsToColors * vtkScalarsToColors::New ( )

static

◆ IsOpaque() [1/3]

virtual vtkTypeBool vtkScalarsToColors::IsOpaque ( )

virtual

Return true if all of the values defining the mapping have an opacity equal to 1.

Default implementation returns true. The more complex signature will yield more accurate results.

Reimplemented in vtkLookupTable, and vtkDiscretizableColorTransferFunction.

◆ IsOpaque() [2/3]

virtual vtkTypeBool vtkScalarsToColors::IsOpaque	(	vtkAbstractArray *	scalars,
		int	colorMode,
		int	component
	)

virtual

Return true if all of the values defining the mapping have an opacity equal to 1.

Default implementation returns true. The more complex signature will yield more accurate results.

Reimplemented in vtkLookupTable, and vtkDiscretizableColorTransferFunction.

◆ IsOpaque() [3/3]

virtual vtkTypeBool vtkScalarsToColors::IsOpaque	(	vtkAbstractArray *	scalars,
		int	colorMode,
		int	component,
		vtkUnsignedCharArray *	ghosts,
		unsigned char	ghostsToSkip = `0xff`
	)

virtual

Return true if all of the values defining the mapping have an opacity equal to 1.

Default implementation returns true. The more complex signature will yield more accurate results.

Reimplemented in vtkLookupTable, and vtkDiscretizableColorTransferFunction.

◆ Build()

virtual void vtkScalarsToColors::Build ( )

inlinevirtual

Perform any processing required (if any) before processing scalars.

Default implementation does nothing.

Reimplemented in vtkLookupTable, and vtkDiscretizableColorTransferFunction.

Definition at line 98 of file vtkScalarsToColors.h.

◆ GetRange()

virtual double * vtkScalarsToColors::GetRange ( )

virtual

Sets/Gets the range of scalars that will be mapped.

Reimplemented in vtkLookupTable, and vtkColorTransferFunction.

◆ SetRange() [1/2]

virtual void vtkScalarsToColors::SetRange	(	double	min,
		double	max
	)

virtual

Sets/Gets the range of scalars that will be mapped.

Reimplemented in vtkLookupTable, and vtkColorTransferFunction.

◆ SetRange() [2/2]

virtual void vtkScalarsToColors::SetRange ( const double rng[2] )

inlinevirtual

Sets/Gets the range of scalars that will be mapped.

Reimplemented in vtkLookupTable, and vtkColorTransferFunction.

Definition at line 106 of file vtkScalarsToColors.h.

◆ MapValue()

virtual const unsigned char * vtkScalarsToColors::MapValue ( double v )

virtual

Map one value through the lookup table and return a color defined as an RGBA unsigned char tuple (4 bytes).

Reimplemented in vtkLookupTable, vtkColorTransferFunction, and vtkDiscretizableColorTransferFunction.

◆ GetColor() [1/2]

virtual void vtkScalarsToColors::GetColor	(	double	v,
		double	rgb[3]
	)

virtual

Map one value through the lookup table and store the color as an RGB array of doubles between 0 and 1 in the rgb argument.

Reimplemented in vtkLookupTable, vtkDiscretizableColorTransferFunction, and vtkColorTransferFunction.

◆ GetColor() [2/2]

double * vtkScalarsToColors::GetColor ( double v )

inline

Map one value through the lookup table and return the color as an RGB array of doubles between 0 and 1.

Definition at line 125 of file vtkScalarsToColors.h.

◆ GetOpacity()

virtual double vtkScalarsToColors::GetOpacity ( double v )

virtual

Map one value through the lookup table and return the alpha value (the opacity) as a double between 0 and 1.

This implementation always returns 1.

Reimplemented in vtkLookupTable, and vtkDiscretizableColorTransferFunction.

◆ GetLuminance()

double vtkScalarsToColors::GetLuminance ( double x )

inline

Map one value through the lookup table and return the luminance 0.3*red + 0.59*green + 0.11*blue as a double between 0 and 1.

Returns the luminance value for the specified scalar value.

Definition at line 143 of file vtkScalarsToColors.h.

◆ SetAlpha()

virtual void vtkScalarsToColors::SetAlpha ( double alpha )

virtual

Specify an additional opacity (alpha) value to blend with.

Values != 1 modify the resulting color consistent with the requested form of the output. This is typically used by an actor in order to blend its opacity. Value is clamped between 0 and 1.

Reimplemented in vtkDiscretizableColorTransferFunction.

◆ GetAlpha()

virtual double vtkScalarsToColors::GetAlpha ( )

virtual

Specify an additional opacity (alpha) value to blend with.

Values != 1 modify the resulting color consistent with the requested form of the output. This is typically used by an actor in order to blend its opacity. Value is clamped between 0 and 1.

◆ MapScalars() [1/2]

virtual vtkUnsignedCharArray * vtkScalarsToColors::MapScalars	(	vtkDataArray *	scalars,
		int	colorMode,
		int	component,
		int	outputFormat = `VTK_RGBA`
	)

virtual

Internal methods that map a data array into an unsigned char array.

The output format can be set to VTK_RGBA (4 components), VTK_RGB (3 components), VTK_LUMINANCE (1 component, greyscale), or VTK_LUMINANCE_ALPHA (2 components). If not supplied, the output format defaults to RGBA. The color mode determines the behavior of mapping. If VTK_COLOR_MODE_DEFAULT is set, then unsigned char data arrays are treated as colors (and converted to RGBA if necessary); If VTK_COLOR_MODE_DIRECT_SCALARS is set, then all arrays are treated as colors (integer types are clamped in the range 0-255, floating point arrays are clamped in the range 0.0-1.0. Note 'char' does not have enough values to represent a color so mapping this type is considered an error); otherwise, the data is mapped through this instance of ScalarsToColors. The component argument is used for data arrays with more than one component; it indicates which component to use to do the blending. When the component argument is -1, then the this object uses its own selected technique to change a vector into a scalar to map.

◆ MapScalars() [2/2]

virtual vtkUnsignedCharArray * vtkScalarsToColors::MapScalars	(	vtkAbstractArray *	scalars,
		int	colorMode,
		int	component,
		int	outputFormat = `VTK_RGBA`
	)

virtual

Internal methods that map a data array into an unsigned char array.

The output format can be set to VTK_RGBA (4 components), VTK_RGB (3 components), VTK_LUMINANCE (1 component, greyscale), or VTK_LUMINANCE_ALPHA (2 components). If not supplied, the output format defaults to RGBA. The color mode determines the behavior of mapping. If VTK_COLOR_MODE_DEFAULT is set, then unsigned char data arrays are treated as colors (and converted to RGBA if necessary); If VTK_COLOR_MODE_DIRECT_SCALARS is set, then all arrays are treated as colors (integer types are clamped in the range 0-255, floating point arrays are clamped in the range 0.0-1.0. Note 'char' does not have enough values to represent a color so mapping this type is considered an error); otherwise, the data is mapped through this instance of ScalarsToColors. The component argument is used for data arrays with more than one component; it indicates which component to use to do the blending. When the component argument is -1, then the this object uses its own selected technique to change a vector into a scalar to map.