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vtkLookupTable Class Reference

#include <vtkLookupTable.h>

Inheritance diagram for vtkLookupTable:

[legend]Collaboration diagram for vtkLookupTable:

[legend]List of all members.

Detailed Description

map scalar values into colors via a lookup table

Date:: 2002/12/26 18:24:21

Revision:: 1.70

vtkLookupTable is an object that is used by mapper objects to map scalar values into rgba (red-green-blue-alpha transparency) color specification, or rgba into scalar values. The color table can be created by direct insertion of color values, or by specifying hue, saturation, value, and alpha range and generating a table.

See also:: vtkLogLookupTable vtkWindowLevelLookupTable

Created by:

Martin, Ken

CVS contributions (if > 5%):

Schroeder, Will (39%)
Gobbi, David (27%)
Martin, Ken (11%)
Miller, Jim (5%)

CVS logs (CVSweb):

.h (/Common/vtkLookupTable.h)
.cxx (/Common/vtkLookupTable.cxx)

Examples:: vtkLookupTable (Examples)

Tests:: vtkLookupTable (Tests)

Definition at line 64 of file vtkLookupTable.h.

Public Types

typedef vtkScalarsToColors Superclass

Public Methods

virtual const char * GetClassName ()

virtual int IsA (const char *type)

void PrintSelf (ostream &os, vtkIndent indent)

int Allocate (int sz=256, int ext=256)

virtual void Build ()

virtual void ForceBuild ()

unsigned char * MapValue (float v)

float GetOpacity (float v)

virtual vtkIdType GetIndex (float v)

void SetTableValue (vtkIdType indx, float rgba[4])

void SetTableValue (vtkIdType indx, float r, float g, float b, float a=1.0)

float * GetTableValue (vtkIdType id)

void GetTableValue (vtkIdType id, float rgba[4])

unsigned char * WritePointer (const vtkIdType id, const int number)

void DeepCopy (vtkLookupTable *lut)

virtual void SetRamp (int)

void SetRampToLinear ()

void SetRampToSCurve ()

void SetRampToSQRT ()

virtual int GetRamp ()

void SetScale (int scale)

void SetScaleToLinear ()

void SetScaleToLog10 ()

virtual int GetScale ()

void SetTableRange (float r[2])

virtual void SetTableRange (float min, float max)

virtual float * GetTableRange ()

virtual void GetTableRange (float data[2])

virtual void SetHueRange (float, float)

void SetHueRange (float[2])

virtual float * GetHueRange ()

virtual void GetHueRange (float &, float &)

virtual void GetHueRange (float[2])

virtual void SetSaturationRange (float, float)

void SetSaturationRange (float[2])

virtual float * GetSaturationRange ()

virtual void GetSaturationRange (float &, float &)

virtual void GetSaturationRange (float[2])

virtual void SetValueRange (float, float)

void SetValueRange (float[2])

virtual float * GetValueRange ()

virtual void GetValueRange (float &, float &)

virtual void GetValueRange (float[2])

virtual void SetAlphaRange (float, float)

void SetAlphaRange (float[2])

virtual float * GetAlphaRange ()

virtual void GetAlphaRange (float &, float &)

virtual void GetAlphaRange (float[2])

float * GetColor (float x)

void GetColor (float x, float rgb[3])

void SetNumberOfTableValues (vtkIdType number)

vtkIdType GetNumberOfTableValues ()

unsigned char * GetPointer (const vtkIdType id)

float * GetRange ()

void SetRange (float min, float max)

void SetRange (float rng[2])

virtual void SetNumberOfColors (vtkIdType)

virtual vtkIdType GetNumberOfColors ()

void MapScalarsThroughTable2 (void *input, unsigned char *output, int inputDataType, int numberOfValues, int inputIncrement, int outputIncrement)

Static Public Methods

vtkLookupTable * New ()

int IsTypeOf (const char *type)

vtkLookupTable * SafeDownCast (vtkObject *o)

Protected Methods

vtkLookupTable (int sze=256, int ext=256)

~vtkLookupTable ()

Protected Attributes

vtkIdType NumberOfColors

vtkUnsignedCharArray * Table

float TableRange [2]

float HueRange [2]

float SaturationRange [2]

float ValueRange [2]

float AlphaRange [2]

int Scale

int Ramp

vtkTimeStamp InsertTime

vtkTimeStamp BuildTime

float RGBA [4]

Member Typedef Documentation

typedef vtkScalarsToColors vtkLookupTable::Superclass

Reimplemented from vtkScalarsToColors.
Reimplemented in vtkLogLookupTable, and vtkWindowLevelLookupTable.
Definition at line 71 of file vtkLookupTable.h.

Constructor & Destructor Documentation

vtkLookupTable::vtkLookupTable ( int sze = 256,

int ext = 256

) [protected]

vtkLookupTable::~vtkLookupTable ( ) [protected]

Member Function Documentation

vtkLookupTable* vtkLookupTable::New ( ) [static]

Construct with range=[0,1]; and hsv ranges set up for rainbow color table (from red to blue).
Reimplemented from vtkObject.
Reimplemented in vtkLogLookupTable, and vtkWindowLevelLookupTable.

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

Reimplemented from vtkScalarsToColors.
Reimplemented in vtkLogLookupTable, and vtkWindowLevelLookupTable.

int vtkLookupTable::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 vtkScalarsToColors.
Reimplemented in vtkLogLookupTable, and vtkWindowLevelLookupTable.

virtual int vtkLookupTable::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 vtkScalarsToColors.
Reimplemented in vtkLogLookupTable, and vtkWindowLevelLookupTable.

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

Reimplemented from vtkScalarsToColors.
Reimplemented in vtkLogLookupTable, and vtkWindowLevelLookupTable.

void vtkLookupTable::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 vtkScalarsToColors.
Reimplemented in vtkLogLookupTable, and vtkWindowLevelLookupTable.

int vtkLookupTable::Allocate ( int sz = 256,

int ext = 256

)

Allocate a color table of specified size.

virtual void vtkLookupTable::Build ( ) [virtual]

Generate lookup table from hue, saturation, value, alpha min/max values. Table is built from linear ramp of each value.
Reimplemented from vtkScalarsToColors.
Reimplemented in vtkWindowLevelLookupTable.

virtual void vtkLookupTable::ForceBuild ( ) [virtual]

Force the lookup table to regenerate from hue, saturation, value, and alpha min/max values. Table is built from a linear ramp of each value. ForceBuild() is useful if a lookup table has been defined manually (using SetTableValue) and then an application decides to rebuild the lookup table using the implicit process.

virtual void vtkLookupTable::SetRamp ( int ) [virtual]

Set the shape of the table ramp to either linear or S-curve. The default is S-curve, which tails off gradually at either end. The equation used for the S-curve is y = (sin((x - 1/2)*pi) + 1)/2, while the equation for the linear ramp is simply y = x. For an S-curve greyscale ramp, you should set NumberOfTableValues to 402 (which is 256*pi/2) to provide room for the tails of the ramp. The equation for the SQRT is y = sqrt(x).

void vtkLookupTable::SetRampToLinear ( ) [inline]

Set the shape of the table ramp to either linear or S-curve. The default is S-curve, which tails off gradually at either end. The equation used for the S-curve is y = (sin((x - 1/2)*pi) + 1)/2, while the equation for the linear ramp is simply y = x. For an S-curve greyscale ramp, you should set NumberOfTableValues to 402 (which is 256*pi/2) to provide room for the tails of the ramp. The equation for the SQRT is y = sqrt(x).
Definition at line 97 of file vtkLookupTable.h.
References VTK_RAMP_LINEAR.

void vtkLookupTable::SetRampToSCurve ( ) [inline]

Set the shape of the table ramp to either linear or S-curve. The default is S-curve, which tails off gradually at either end. The equation used for the S-curve is y = (sin((x - 1/2)*pi) + 1)/2, while the equation for the linear ramp is simply y = x. For an S-curve greyscale ramp, you should set NumberOfTableValues to 402 (which is 256*pi/2) to provide room for the tails of the ramp. The equation for the SQRT is y = sqrt(x).
Definition at line 98 of file vtkLookupTable.h.
References VTK_RAMP_SCURVE.

void vtkLookupTable::SetRampToSQRT ( ) [inline]

Set the shape of the table ramp to either linear or S-curve. The default is S-curve, which tails off gradually at either end. The equation used for the S-curve is y = (sin((x - 1/2)*pi) + 1)/2, while the equation for the linear ramp is simply y = x. For an S-curve greyscale ramp, you should set NumberOfTableValues to 402 (which is 256*pi/2) to provide room for the tails of the ramp. The equation for the SQRT is y = sqrt(x).
Definition at line 99 of file vtkLookupTable.h.
References VTK_RAMP_SQRT.

virtual int vtkLookupTable::GetRamp ( ) [virtual]

Set the shape of the table ramp to either linear or S-curve. The default is S-curve, which tails off gradually at either end. The equation used for the S-curve is y = (sin((x - 1/2)*pi) + 1)/2, while the equation for the linear ramp is simply y = x. For an S-curve greyscale ramp, you should set NumberOfTableValues to 402 (which is 256*pi/2) to provide room for the tails of the ramp. The equation for the SQRT is y = sqrt(x).

void vtkLookupTable::SetScale ( int scale )

Set the type of scale to use, linear or logarithmic. The default is linear. If the scale is logarithmic, then the TableRange must not cross the value zero.

void vtkLookupTable::SetScaleToLinear ( ) [inline]

Set the type of scale to use, linear or logarithmic. The default is linear. If the scale is logarithmic, then the TableRange must not cross the value zero.
Definition at line 108 of file vtkLookupTable.h.
References VTK_SCALE_LINEAR.

void vtkLookupTable::SetScaleToLog10 ( ) [inline]

Set the type of scale to use, linear or logarithmic. The default is linear. If the scale is logarithmic, then the TableRange must not cross the value zero.
Definition at line 109 of file vtkLookupTable.h.
References VTK_SCALE_LOG10.

virtual int vtkLookupTable::GetScale ( ) [virtual]

Set the type of scale to use, linear or logarithmic. The default is linear. If the scale is logarithmic, then the TableRange must not cross the value zero.

void vtkLookupTable::SetTableRange ( float r[2] )

Set/Get the minimum/maximum scalar values for scalar mapping. Scalar values less than minimum range value are clamped to minimum range value. Scalar values greater than maximum range value are clamped to maximum range value.
Referenced by vtkWindowLevelLookupTable::SetLevel(), and vtkWindowLevelLookupTable::SetWindow().

virtual void vtkLookupTable::SetTableRange ( float min,

float max

) [virtual]

Set/Get the minimum/maximum scalar values for scalar mapping. Scalar values less than minimum range value are clamped to minimum range value. Scalar values greater than maximum range value are clamped to maximum range value.

virtual float* vtkLookupTable::GetTableRange ( ) [virtual]

Set/Get the minimum/maximum scalar values for scalar mapping. Scalar values less than minimum range value are clamped to minimum range value. Scalar values greater than maximum range value are clamped to maximum range value.

virtual void vtkLookupTable::GetTableRange ( float data[2] ) [virtual]

Set/Get the minimum/maximum scalar values for scalar mapping. Scalar values less than minimum range value are clamped to minimum range value. Scalar values greater than maximum range value are clamped to maximum range value.

virtual void vtkLookupTable::SetHueRange ( float ,

float

) [virtual]

Set the range in hue (using automatic generation). Hue ranges between [0,1].

void vtkLookupTable::SetHueRange ( float [2] )

Set the range in hue (using automatic generation). Hue ranges between [0,1].

virtual float* vtkLookupTable::GetHueRange ( ) [virtual]

Set the range in hue (using automatic generation). Hue ranges between [0,1].

virtual void vtkLookupTable::GetHueRange ( float & ,

float &

) [virtual]

Set the range in hue (using automatic generation). Hue ranges between [0,1].

virtual void vtkLookupTable::GetHueRange ( float [2] ) [virtual]

Set the range in hue (using automatic generation). Hue ranges between [0,1].

virtual void vtkLookupTable::SetSaturationRange ( float ,

float

) [virtual]

Set the range in saturation (using automatic generation). Saturation ranges between [0,1].

void vtkLookupTable::SetSaturationRange ( float [2] )

Set the range in saturation (using automatic generation). Saturation ranges between [0,1].

virtual float* vtkLookupTable::GetSaturationRange ( ) [virtual]

Set the range in saturation (using automatic generation). Saturation ranges between [0,1].

virtual void vtkLookupTable::GetSaturationRange ( float & ,

float &

) [virtual]

Set the range in saturation (using automatic generation). Saturation ranges between [0,1].

virtual void vtkLookupTable::GetSaturationRange ( float [2] ) [virtual]

Set the range in saturation (using automatic generation). Saturation ranges between [0,1].

virtual void vtkLookupTable::SetValueRange ( float ,

float

) [virtual]

Set the range in value (using automatic generation). Value ranges between [0,1].

void vtkLookupTable::SetValueRange ( float [2] )

Set the range in value (using automatic generation). Value ranges between [0,1].

virtual float* vtkLookupTable::GetValueRange ( ) [virtual]

Set the range in value (using automatic generation). Value ranges between [0,1].

virtual void vtkLookupTable::GetValueRange ( float & ,

float &

) [virtual]

Set the range in value (using automatic generation). Value ranges between [0,1].

virtual void vtkLookupTable::GetValueRange ( float [2] ) [virtual]

Set the range in value (using automatic generation). Value ranges between [0,1].

virtual void vtkLookupTable::SetAlphaRange ( float ,

float

) [virtual]

Set the range in alpha (using automatic generation). Alpha ranges from [0,1].

void vtkLookupTable::SetAlphaRange ( float [2] )

Set the range in alpha (using automatic generation). Alpha ranges from [0,1].

virtual float* vtkLookupTable::GetAlphaRange ( ) [virtual]

Set the range in alpha (using automatic generation). Alpha ranges from [0,1].

virtual void vtkLookupTable::GetAlphaRange ( float & ,

float &

) [virtual]

Set the range in alpha (using automatic generation). Alpha ranges from [0,1].

virtual void vtkLookupTable::GetAlphaRange ( float [2] ) [virtual]

Set the range in alpha (using automatic generation). Alpha ranges from [0,1].

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

Map one value through the lookup table.
Implements vtkScalarsToColors.

float* vtkLookupTable::GetColor ( float x ) [inline]

Map one value through the lookup table and return the color as an RGB array of floats between 0 and 1.
Reimplemented from vtkScalarsToColors.
Definition at line 157 of file vtkLookupTable.h.
References vtkScalarsToColors::GetColor().

void vtkLookupTable::GetColor ( float x,

float rgb[3]

) [virtual]

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

float vtkLookupTable::GetOpacity ( float v )

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

virtual vtkIdType vtkLookupTable::GetIndex ( float v ) [virtual]

Return the table index associated with a particular value.

void vtkLookupTable::SetNumberOfTableValues ( vtkIdType number )

Specify the number of values (i.e., colors) in the lookup table.

vtkIdType vtkLookupTable::GetNumberOfTableValues ( ) [inline]

Specify the number of values (i.e., colors) in the lookup table.
Definition at line 171 of file vtkLookupTable.h.
References vtkIdType.

void vtkLookupTable::SetTableValue ( vtkIdType indx,

float rgba[4]

)

Directly load color into lookup table. Use [0,1] float values for color component specification. Make sure that you've either used the Build() method or used SetNumberOfTableValues() prior to using this method.

void vtkLookupTable::SetTableValue ( vtkIdType indx,

float r,

float g,

float b,

float a = 1.0

)

Directly load color into lookup table. Use [0,1] float values for color component specification.

float* vtkLookupTable::GetTableValue ( vtkIdType id )

Return a rgba color value for the given index into the lookup table. Color components are expressed as [0,1] float values.

void vtkLookupTable::GetTableValue ( vtkIdType id,

float rgba[4]

)

Return a rgba color value for the given index into the lookup table. Color components are expressed as [0,1] float values.

unsigned char* vtkLookupTable::GetPointer ( const vtkIdType id ) [inline]

Get pointer to color table data. Format is array of unsigned char r-g-b-a-r-g-b-a...
Definition at line 195 of file vtkLookupTable.h.
References id, and vtkIdType.

unsigned char * vtkLookupTable::WritePointer ( const vtkIdType id,

const int number

) [inline]

Get pointer to data. Useful for direct writes into object. MaxId is bumped by number (and memory allocated if necessary). Id is the location you wish to write into; number is the number of rgba values to write.
Definition at line 254 of file vtkLookupTable.h.
References id, Table, vtkIdType, and vtkUnsignedCharArray::WritePointer().

float* vtkLookupTable::GetRange ( ) [inline, virtual]

Sets/Gets the range of scalars which will be mapped. This is a duplicate of Get/SetTableRange.
Implements vtkScalarsToColors.
Definition at line 208 of file vtkLookupTable.h.

void vtkLookupTable::SetRange ( float min,

float max

) [inline, virtual]

Sets/Gets the range of scalars which will be mapped. This is a duplicate of Get/SetTableRange.
Implements vtkScalarsToColors.
Definition at line 209 of file vtkLookupTable.h.

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

Sets/Gets the range of scalars which will be mapped. This is a duplicate of Get/SetTableRange.
Reimplemented from vtkScalarsToColors.
Definition at line 210 of file vtkLookupTable.h.
References vtkScalarsToColors::SetRange().

virtual void vtkLookupTable::SetNumberOfColors ( vtkIdType ) [virtual]

Set the number of colors in the lookup table. Use SetNumberOfTableValues() instead, it can be used both before and after the table has been built whereas SetNumberOfColors() has no effect after the table has been built.

virtual vtkIdType vtkLookupTable::GetNumberOfColors ( ) [virtual]

Set the number of colors in the lookup table. Use SetNumberOfTableValues() instead, it can be used both before and after the table has been built whereas SetNumberOfColors() has no effect after the table has been built.

void vtkLookupTable::MapScalarsThroughTable2 ( void * input,

unsigned char * output,

int inputDataType,

int numberOfValues,

int inputIncrement,

int outputIncrement

) [virtual]

map a set of scalars through the lookup table
Implements vtkScalarsToColors.

void vtkLookupTable::DeepCopy ( vtkLookupTable * lut )

Copy the contents from another LookupTable

Member Data Documentation

vtkIdType vtkLookupTable::NumberOfColors [protected]

Definition at line 236 of file vtkLookupTable.h.

vtkUnsignedCharArray* vtkLookupTable::Table [protected]

Definition at line 237 of file vtkLookupTable.h.
Referenced by WritePointer().

float vtkLookupTable::TableRange[2] [protected]

Definition at line 238 of file vtkLookupTable.h.

float vtkLookupTable::HueRange[2] [protected]

Definition at line 239 of file vtkLookupTable.h.

float vtkLookupTable::SaturationRange[2] [protected]

Definition at line 240 of file vtkLookupTable.h.

float vtkLookupTable::ValueRange[2] [protected]

Definition at line 241 of file vtkLookupTable.h.

float vtkLookupTable::AlphaRange[2] [protected]

Definition at line 242 of file vtkLookupTable.h.

int vtkLookupTable::Scale [protected]

Definition at line 243 of file vtkLookupTable.h.

int vtkLookupTable::Ramp [protected]

Definition at line 244 of file vtkLookupTable.h.

vtkTimeStamp vtkLookupTable::InsertTime [protected]

Definition at line 245 of file vtkLookupTable.h.

vtkTimeStamp vtkLookupTable::BuildTime [protected]

Definition at line 246 of file vtkLookupTable.h.

float vtkLookupTable::RGBA[4] [protected]

Definition at line 247 of file vtkLookupTable.h.

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

Common/vtkLookupTable.h


Public Types
typedef vtkScalarsToColors	Superclass
Public Methods
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
int	Allocate (int sz=256, int ext=256)
virtual void	Build ()
virtual void	ForceBuild ()
unsigned char *	MapValue (float v)
float	GetOpacity (float v)
virtual vtkIdType	GetIndex (float v)
void	SetTableValue (vtkIdType indx, float rgba[4])
void	SetTableValue (vtkIdType indx, float r, float g, float b, float a=1.0)
float *	GetTableValue (vtkIdType id)
void	GetTableValue (vtkIdType id, float rgba[4])
unsigned char *	WritePointer (const vtkIdType id, const int number)
void	DeepCopy (vtkLookupTable *lut)

virtual void	SetRamp (int)
void	SetRampToLinear ()
void	SetRampToSCurve ()
void	SetRampToSQRT ()
virtual int	GetRamp ()

void	SetScale (int scale)
void	SetScaleToLinear ()
void	SetScaleToLog10 ()
virtual int	GetScale ()

void	SetTableRange (float r[2])
virtual void	SetTableRange (float min, float max)
virtual float *	GetTableRange ()
virtual void	GetTableRange (float data[2])

virtual void	SetHueRange (float, float)
void	SetHueRange (float[2])
virtual float *	GetHueRange ()
virtual void	GetHueRange (float &, float &)
virtual void	GetHueRange (float[2])

virtual void	SetSaturationRange (float, float)
void	SetSaturationRange (float[2])
virtual float *	GetSaturationRange ()
virtual void	GetSaturationRange (float &, float &)
virtual void	GetSaturationRange (float[2])

virtual void	SetValueRange (float, float)
void	SetValueRange (float[2])
virtual float *	GetValueRange ()
virtual void	GetValueRange (float &, float &)
virtual void	GetValueRange (float[2])

virtual void	SetAlphaRange (float, float)
void	SetAlphaRange (float[2])
virtual float *	GetAlphaRange ()
virtual void	GetAlphaRange (float &, float &)
virtual void	GetAlphaRange (float[2])

float *	GetColor (float x)
void	GetColor (float x, float rgb[3])

void	SetNumberOfTableValues (vtkIdType number)
vtkIdType	GetNumberOfTableValues ()

unsigned char *	GetPointer (const vtkIdType id)

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

virtual void	SetNumberOfColors (vtkIdType)
virtual vtkIdType	GetNumberOfColors ()

void	MapScalarsThroughTable2 (void input, unsigned char output, int inputDataType, int numberOfValues, int inputIncrement, int outputIncrement)
Static Public Methods
vtkLookupTable *	New ()
int	IsTypeOf (const char *type)
vtkLookupTable *	SafeDownCast (vtkObject *o)
Protected Methods
	vtkLookupTable (int sze=256, int ext=256)
	~vtkLookupTable ()
Protected Attributes
vtkIdType	NumberOfColors
vtkUnsignedCharArray *	Table
float	TableRange [2]
float	HueRange [2]
float	SaturationRange [2]
float	ValueRange [2]
float	AlphaRange [2]
int	Scale
int	Ramp
vtkTimeStamp	InsertTime
vtkTimeStamp	BuildTime
float	RGBA [4]