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vtkScalarsToColors Class Reference

#include <vtkScalarsToColors.h>

Inheritance diagram for vtkScalarsToColors:

[legend]Collaboration diagram for vtkScalarsToColors:

[legend]List of all members.

Detailed Description

map scalar values into colors

Date:: 2003/01/06 20:36:14

Revision:: 1.28

vtkScalarsToColors is a general purpose superclass for objects that convert scalars to colors. This include vtkLookupTable classes and color transfer functions.

The scalars 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.

See also:: vtkLookupTable vtkColorTransferFunction

Created by:

Martin, Ken

CVS contributions (if > 5%):

Schroeder, Will (38%)
Martin, Ken (24%)
Gobbi, David (15%)
Geveci, Berk (11%)
Law, Charles (6%)

CVS logs (CVSweb):

.h (/Common/vtkScalarsToColors.h)
.cxx (/Common/vtkScalarsToColors.cxx)

Definition at line 56 of file vtkScalarsToColors.h.

Public Types

typedef vtkObject Superclass

Public Methods

virtual const char * GetClassName ()

virtual int IsA (const char *type)

void PrintSelf (ostream &os, vtkIndent indent)

virtual void Build ()

virtual unsigned char * MapValue (float v)=0

virtual void GetColor (float v, float rgb[3])=0

virtual float * GetRange ()=0

virtual void SetRange (float min, float max)=0

void SetRange (float rng[2])

float * GetColor (float v)

virtual float GetOpacity (float vtkNotUsed(v))

float GetLuminance (float x)

void SetAlpha (float alpha)

virtual float GetAlpha ()

vtkUnsignedCharArray * MapScalars (vtkDataArray *scalars, int colorMode, int component)

virtual void SetVectorMode (int)

virtual int GetVectorMode ()

void SetVectorModeToMagnitude ()

void SetVectorModeToComponent ()

virtual void SetVectorComponent (int)

virtual int GetVectorComponent ()

void MapScalarsThroughTable (vtkDataArray *scalars, unsigned char *output, int outputFormat)

void MapScalarsThroughTable (vtkDataArray *scalars, unsigned char *output)

virtual void MapScalarsThroughTable2 (void *input, unsigned char *output, int inputDataType, int numberOfValues, int inputIncrement, int outputFormat)=0

virtual vtkUnsignedCharArray * ConvertUnsignedCharToRGBA (vtkUnsignedCharArray *colors, int numComp, int numTuples)

Static Public Methods

int IsTypeOf (const char *type)

vtkScalarsToColors * SafeDownCast (vtkObject *o)

Protected Types

enum VectorModes { MAGNITUDE = 0, COMPONENT = 1 }

Protected Methods

vtkScalarsToColors ()

~vtkScalarsToColors ()

Protected Attributes

float Alpha

int VectorMode

int UseMagnitude

int VectorComponent

Member Typedef Documentation

typedef vtkObject vtkScalarsToColors::Superclass

Reimplemented from vtkObject.
Reimplemented in vtkLogLookupTable, vtkLookupTable, vtkWindowLevelLookupTable, and vtkColorTransferFunction.
Definition at line 59 of file vtkScalarsToColors.h.

Member Enumeration Documentation

enum vtkScalarsToColors::VectorModes [protected]

Enumeration values:

MAGNITUDE

COMPONENT

Definition at line 188 of file vtkScalarsToColors.h.

Constructor & Destructor Documentation

vtkScalarsToColors::vtkScalarsToColors ( ) [protected]

vtkScalarsToColors::~vtkScalarsToColors ( ) [inline, protected]

Definition at line 175 of file vtkScalarsToColors.h.

Member Function Documentation

virtual const char* vtkScalarsToColors::GetClassName ( ) [virtual]

Reimplemented from vtkObject.
Reimplemented in vtkLogLookupTable, vtkLookupTable, vtkWindowLevelLookupTable, and vtkColorTransferFunction.

int vtkScalarsToColors::IsTypeOf ( const char * type ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.
Reimplemented from vtkObject.
Reimplemented in vtkLogLookupTable, vtkLookupTable, vtkWindowLevelLookupTable, and vtkColorTransferFunction.

virtual int vtkScalarsToColors::IsA ( const char * type ) [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 vtkTypeRevisionMacro found in vtkSetGet.h.
Reimplemented from vtkObject.
Reimplemented in vtkLogLookupTable, vtkLookupTable, vtkWindowLevelLookupTable, and vtkColorTransferFunction.

vtkScalarsToColors* vtkScalarsToColors::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkObject.
Reimplemented in vtkLogLookupTable, vtkLookupTable, vtkWindowLevelLookupTable, and vtkColorTransferFunction.

void vtkScalarsToColors::PrintSelf ( ostream & os,

vtkIndent indent

) [virtual]

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 vtkLogLookupTable, vtkLookupTable, vtkWindowLevelLookupTable, and vtkColorTransferFunction.

virtual void vtkScalarsToColors::Build ( ) [inline, virtual]

Perform any processing required (if any) before processing scalars.
Reimplemented in vtkLookupTable, and vtkWindowLevelLookupTable.
Definition at line 63 of file vtkScalarsToColors.h.

virtual float* vtkScalarsToColors::GetRange ( ) [pure virtual]

Sets/Gets the range of scalars which will be mapped.
Implemented in vtkLookupTable, and vtkColorTransferFunction.

virtual void vtkScalarsToColors::SetRange ( float min,

float max

) [pure virtual]

Sets/Gets the range of scalars which will be mapped.
Implemented in vtkLookupTable, and vtkColorTransferFunction.
Referenced by vtkColorTransferFunction::SetRange(), and vtkLookupTable::SetRange().

void vtkScalarsToColors::SetRange ( float rng[2] ) [inline]

Sets/Gets the range of scalars which will be mapped.
Reimplemented in vtkLookupTable, and vtkColorTransferFunction.
Definition at line 69 of file vtkScalarsToColors.h.

virtual unsigned char* vtkScalarsToColors::MapValue ( float v ) [pure virtual]

Map one value through the lookup table and return a color defined as a RGBA unsigned char tuple (4 bytes).
Implemented in vtkLookupTable, and vtkColorTransferFunction.

virtual void vtkScalarsToColors::GetColor ( float v,

float rgb[3]

) [pure virtual]

Map one value through the lookup table and return the color as an RGB array of floats between 0 and 1.
Implemented in vtkLookupTable, and vtkColorTransferFunction.
Referenced by vtkColorTransferFunction::GetColor(), and vtkLookupTable::GetColor().

float* vtkScalarsToColors::GetColor ( float v ) [inline]

Map one value through the lookup table and return the color as an RGB array of floats between 0 and 1.
Reimplemented in vtkLookupTable, and vtkColorTransferFunction.
Definition at line 84 of file vtkScalarsToColors.h.

virtual float vtkScalarsToColors::GetOpacity ( float vtkNotUsed(v) ) [inline, virtual]

Map one value through the lookup table and return the alpha value (the opacity) as a float between 0 and 1.
Definition at line 91 of file vtkScalarsToColors.h.

float vtkScalarsToColors::GetLuminance ( float x ) [inline]

Map one value through the lookup table and return the luminance 0.3*red + 0.59*green + 0.11*blue as a float between 0 and 1. Returns the luminance value for the specified scalar value.
Definition at line 99 of file vtkScalarsToColors.h.

void vtkScalarsToColors::SetAlpha ( float alpha )

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.

virtual float 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.

vtkUnsignedCharArray* vtkScalarsToColors::MapScalars ( vtkDataArray * scalars,

int colorMode,

int component

)

An internal method maps a data array into a 4-component, unsigned char RGBA array. 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); otherwise, the data is mapped through this instance of ScalarsToColors. The offset 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.

virtual void vtkScalarsToColors::SetVectorMode ( int ) [virtual]

Change mode that maps vectors by magnitude vs. component.

virtual int vtkScalarsToColors::GetVectorMode ( ) [virtual]

Change mode that maps vectors by magnitude vs. component.

void vtkScalarsToColors::SetVectorModeToMagnitude ( )

Change mode that maps vectors by magnitude vs. component.

void vtkScalarsToColors::SetVectorModeToComponent ( )

Change mode that maps vectors by magnitude vs. component.

virtual void vtkScalarsToColors::SetVectorComponent ( int ) [virtual]

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

virtual int vtkScalarsToColors::GetVectorComponent ( ) [virtual]

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

void vtkScalarsToColors::MapScalarsThroughTable ( vtkDataArray * scalars,

unsigned char * output,

int outputFormat

)

Map a set of scalars through the lookup table in a single operation. 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.

void vtkScalarsToColors::MapScalarsThroughTable ( vtkDataArray * scalars,

unsigned char * output

) [inline]

Map a set of scalars through the lookup table in a single operation. 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.
Definition at line 151 of file vtkScalarsToColors.h.
References VTK_RGBA.

virtual void vtkScalarsToColors::MapScalarsThroughTable2 ( void * input,

unsigned char * output,

int inputDataType,

int numberOfValues,

int inputIncrement,

int outputFormat

) [pure virtual]

An internal method typically not used in applications.
Implemented in vtkLookupTable, and vtkColorTransferFunction.

virtual vtkUnsignedCharArray* vtkScalarsToColors::ConvertUnsignedCharToRGBA ( vtkUnsignedCharArray * colors,

int numComp,

int numTuples

) [virtual]

An internal method used to convert a color array to RGBA. The method instantiates a vtkUnsignedCharArray and returns it. The user is responsible for managing the memory.

Member Data Documentation

float vtkScalarsToColors::Alpha [protected]

Definition at line 177 of file vtkScalarsToColors.h.

int vtkScalarsToColors::VectorMode [protected]

Definition at line 180 of file vtkScalarsToColors.h.

int vtkScalarsToColors::UseMagnitude [protected]

Definition at line 184 of file vtkScalarsToColors.h.

int vtkScalarsToColors::VectorComponent [protected]

Definition at line 185 of file vtkScalarsToColors.h.

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

Common/vtkScalarsToColors.h


Public Types
typedef vtkObject	Superclass
Public Methods
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
virtual void	Build ()
virtual unsigned char *	MapValue (float v)=0
virtual void	GetColor (float v, float rgb[3])=0

virtual float *	GetRange ()=0
virtual void	SetRange (float min, float max)=0
void	SetRange (float rng[2])

float *	GetColor (float v)

virtual float	GetOpacity (float vtkNotUsed(v))

float	GetLuminance (float x)

void	SetAlpha (float alpha)
virtual float	GetAlpha ()

vtkUnsignedCharArray *	MapScalars (vtkDataArray *scalars, int colorMode, int component)

virtual void	SetVectorMode (int)
virtual int	GetVectorMode ()
void	SetVectorModeToMagnitude ()
void	SetVectorModeToComponent ()

virtual void	SetVectorComponent (int)
virtual int	GetVectorComponent ()

void	MapScalarsThroughTable (vtkDataArray scalars, unsigned char output, int outputFormat)
void	MapScalarsThroughTable (vtkDataArray scalars, unsigned char output)

virtual void	MapScalarsThroughTable2 (void input, unsigned char output, int inputDataType, int numberOfValues, int inputIncrement, int outputFormat)=0

virtual vtkUnsignedCharArray *	ConvertUnsignedCharToRGBA (vtkUnsignedCharArray *colors, int numComp, int numTuples)
Static Public Methods
int	IsTypeOf (const char *type)
vtkScalarsToColors *	SafeDownCast (vtkObject *o)
Protected Types
enum	VectorModes { MAGNITUDE = 0, COMPONENT = 1 }
Protected Methods
	vtkScalarsToColors ()
	~vtkScalarsToColors ()
Protected Attributes
float	Alpha
int	VectorMode
int	UseMagnitude
int	VectorComponent