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Charts Package API Reference Guide

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IlvAbstractScaleDisplayer Class Referenceabstract

Base class for scales. More...

#include <ilviews/charts/scaledis.h>

Inheritance diagram for IlvAbstractScaleDisplayer:
IlvSingleScaleDisplayer IlvCircularScaleDisplayer IlvRectangularScaleDisplayer

Public Types

enum  LabelLayout { LabelInside, LabelOutside }
 This enumeration type defines the label layout on the scale axis. More...
 
enum  TickLayout { TickInside, TickOutside, TickCross }
 This enumeration type defines the tick layout on the scale axis. More...
 

Public Member Functions

virtual ~IlvAbstractScaleDisplayer ()
 Destructor. More...
 
virtual IlvAbstractScaleDisplayercopy () const =0
 Virtual copy constructor. More...
 
virtual void drawLabelOnCrossings (IlBoolean b)=0
 Indicates whether the labels should be drawn where the axes intersect. More...
 
virtual void drawOverlappingLabels (IlBoolean b)=0
 Sets whether overlapping labels are allowed. More...
 
virtual IlvCoordinateInfogetCoordinateInfo (IlUInt index=0) const =0
 Deprecated Returns the coordinate information associated with the scale. More...
 
virtual IlvCoordinateType getCoordinateType () const =0
 Returns the type of the coordinate represented by the current scale. More...
 
IlBoolean getCrossingValue (IlDouble &dataValue) const
 Returns the data value to which the scale is actually fixed. More...
 
IlvDrawOrder getDrawOrder () const
 Returns the drawing order for the current scale. More...
 
IlvCoordinateInfogetInfoForCrossingValue () const
 Returns the coordinate information used to position the scale. More...
 
const char * getName () const
 Returns the name of the scale. More...
 
IlBoolean getRelativePosition (IlvAxisPosition &relPos, IlvPos &offset) const
 Returns the relative position to which the scale is fixed. More...
 
IlDouble getStoredCrossingValue () const
 Returns the stored value to which the scale is fixed. More...
 
IlBoolean isAlwaysVisible () const
 Indicates whether the current scale must always appear on the screen. More...
 
IlBoolean isFixedToPosition () const
 Indicates whether the scale is fixed to a position. More...
 
IlBoolean isInVisibleDataArea () const
 Indicates whether the scale is in the visible data area. More...
 
virtual IlBoolean isOnAbscissa () const =0
 Indicates whether the scale is connected to the abscissa coordinate system. More...
 
virtual IlBoolean isOnOrdinate () const =0
 Indicates whether the scale is connected to an ordinate coordinate system. More...
 
IlBoolean isVisible () const
 Indicates whether the scale is visible. More...
 
IlvOutputFilesave (IlvOutputFile &file) const
 Writes a complete description of the current object in a file. More...
 
virtual void setAlwaysVisible (IlBoolean b)
 Specifies whether the current scale must always appear on the screen. More...
 
virtual void setArrowLength (IlvDim length)=0
 Sets the arrow length. More...
 
virtual void setArrowWidth (IlvDim width)=0
 Sets the arrow width. More...
 
virtual void setAxisLabelOffset (IlvDim offset)=0
 Sets the offset between the scale axis and its label. More...
 
virtual void setAxisLabelPalette (IlvPalette *pal)=0
 Sets the palette used to draw the axis label. More...
 
virtual void setAxisOriented (IlBoolean oriented)=0
 Indicates whether the scale should be oriented. More...
 
virtual void setAxisPalette (IlvPalette *pal)=0
 Sets the palette used to draw the axis. More...
 
virtual IlBoolean setCrossingValue (IlDouble dataValue, const IlvSingleScaleDisplayer *ref)
 Sets the data value to which this scale is fixed. More...
 
virtual void setDrawOrder (IlvDrawOrder drawOrder)
 Sets the drawing order for the current scale. More...
 
virtual void setGridDrawOrder (IlvDrawOrder drawOrder)=0
 Sets the drawing order for the associated grid. More...
 
virtual void setLabelLayout (LabelLayout layout)=0
 Sets the label layout on the scale axis. More...
 
virtual void setLabelZoomFactor (IlDouble scale)=0
 Sets the label scale factor. More...
 
virtual void setMajorTickSize (IlvDim size)=0
 Sets the size of the major ticks. More...
 
virtual void setMinorTickSize (IlvDim size)=0
 Sets the size of the minor ticks. More...
 
void setName (const char *name)
 Sets the name of the scale. More...
 
virtual void setOffset (IlvDim dim)=0
 Sets the offset between the ticks and the step labels. More...
 
virtual void setRelativePosition (IlvAxisPosition relPos, IlvPos offset=0)
 Sets the position to which this scale is fixed. More...
 
virtual void setStepLabel (IlUInt labelIndex, const char *label)=0
 Sets the label for a given step by hand. More...
 
virtual void setStepLabelAngle (IlDouble angle)=0
 Sets the angle of the step labels. More...
 
virtual void setStepLabelFormat (const char *format, IlBoolean invalidate=IlTrue)=0
 Sets the format used to translate data values into step labels. More...
 
virtual void setStepLabels (IlUInt count, const char *const *labels=0)=0
 Sets the step labels by hand. More...
 
virtual void setStepLabelsPalette (IlvPalette *pal)=0
 Sets the palette used to draw the step labels. More...
 
virtual void setTickLayout (TickLayout layout)=0
 Sets the tick layout on the scale axis. More...
 
virtual void setValueToLabelCB (IlvValueToLabelCB cb, IlAny cbData=0)=0
 Sets a conversion callback between data values and step labels. More...
 
void setVisible (IlBoolean visible)
 Sets the visibility of the scale. More...
 
virtual void write (IlvOutputFile &file) const
 Writes the attributes of the current object in a file. More...
 

Static Public Member Functions

static IlvAbstractScaleDisplayerLoad (IlvInputFile &file)
 Reads a scale object from a file. More...
 

Protected Member Functions

 IlvAbstractScaleDisplayer ()
 Constructor. More...
 
 IlvAbstractScaleDisplayer (const IlvAbstractScaleDisplayer &scaleDisplayer)
 Constructor. More...
 
 IlvAbstractScaleDisplayer (IlvInputFile &file)
 Constructor. More...
 

Friends

class IlvAbscissaAxisElement
 
class IlvAxisElement
 

Detailed Description

Base class for scales.

Library: ilvcharts

IlvAbstractScaleDisplayer is an abstract base class that allows you to display a scale. It provides an API for customizing the general scale layout and its appearance.

This class consists mostly of pure virtual methods. In single-scale subclasses, these methods are implemented to handle the various requests for scales representing a single coordinate.

See Also
IlvSingleScaleDisplayer.

Member Enumeration Documentation

This enumeration type defines the label layout on the scale axis.

Enumerator
LabelInside 

The labels will expand inside the data display area.

LabelOutside 

The labels will expand outside the data display area.

This enumeration type defines the tick layout on the scale axis.

Ticks along the scales can have several aspects. This type indicates which aspect you want to use.

Enumerator
TickInside 

The ticks will expand inside the data display area.

TickOutside 

The ticks will expand outside the data display area.

TickCross 

The ticks will expand both inside and outside the data display area.

Constructor & Destructor Documentation

virtual IlvAbstractScaleDisplayer::~IlvAbstractScaleDisplayer ( )
virtual

Destructor.

If the scale is fixed to the value of another coordinate, the associated coordinate information is unlocked.

IlvAbstractScaleDisplayer::IlvAbstractScaleDisplayer ( )
protected

Constructor.

Initializes a new IlvAbstractScaleDisplayer object. By default, the created scale is visible and fixed relatively to the position where the minimum data is displayed, with a relative offset equal to 0. The Boolean value indicating whether the scale must be always visible is set to IlFalse (see the IlvAbstractScaleDisplayer::setAlwaysVisible() method) and the drawing order is set to IlvDrawAbove (see the IlvAbstractScaleDisplayer::setDrawOrder() method).

IlvAbstractScaleDisplayer::IlvAbstractScaleDisplayer ( const IlvAbstractScaleDisplayer scaleDisplayer)
protected

Constructor.

Initializes a new IlvAbstractScaleDisplayer object as a copy of scaleDisplayer.

Parameters
scaleDisplayerThe object used to initialize the current one.
IlvAbstractScaleDisplayer::IlvAbstractScaleDisplayer ( IlvInputFile file)
protected

Constructor.

Initializes a new IlvAbstractScaleDisplayer object from the description read in the input file named file.

Parameters
fileThe file used to initialize the current scale displayer.

Member Function Documentation

virtual IlvAbstractScaleDisplayer* IlvAbstractScaleDisplayer::copy ( ) const
pure virtual

Virtual copy constructor.

Creates and returns a copy of the current object. This method must be overloaded in subclasses. It is automatically declared by the DeclareScaleDisplayerTypeInfo macro. The IlvPredefinedScaleDisplayerIOMembers macro lets you define a default implementation, which returns an instance initialized with the copy constructor.

Returns
A copy of the current object.
virtual void IlvAbstractScaleDisplayer::drawLabelOnCrossings ( IlBoolean  b)
pure virtual

Indicates whether the labels should be drawn where the axes intersect.

Parameters
bThe new value of the Boolean indicating whether the labels should be drawn where the axes intersect. This Boolean is equal<code/code> if the labels should be drawn where the axes intersect and IlFalse otherwise.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::drawOverlappingLabels ( IlBoolean  b)
pure virtual

Sets whether overlapping labels are allowed.

If labels are not allowed to overlap (b is equal to IlFalse), the IlvSingleScaleDisplayer::getNumberOfSkippedSteps() method will be called to compute the number of steps to skip when drawing the labels.

Parameters
bThe new value of the Boolean indicating whether the labels can be overlapped. This Boolean is equal to IlTrue if overlapping labels are allowed and IlFalse otherwise.

Implemented in IlvSingleScaleDisplayer.

virtual IlvCoordinateInfo* IlvAbstractScaleDisplayer::getCoordinateInfo ( IlUInt  index = 0) const
pure virtual

Deprecated Returns the coordinate information associated with the scale.

Parameters
indexThe index of the returned coordinate information object among the coordinate information objects associated with the scale.
Note
The index index is set to 0 by default since only one coordinate information object is associated with a scale by default.
Returns
A pointer to the associated coordinate information.
See Also
IlvChartGraphic::getOrdinateInfo(), IlvChartGraphic::getAbscissaInfo().

Implemented in IlvSingleScaleDisplayer.

virtual IlvCoordinateType IlvAbstractScaleDisplayer::getCoordinateType ( ) const
pure virtual

Returns the type of the coordinate represented by the current scale.

Returns
IlvAbscissaCoordinate if the coordinate represented by the current scale is the abscissa coordinate and IlvOrdinateCoordinate if the coordinate represented by the current scale is an ordinate coordinate.

Implemented in IlvSingleScaleDisplayer.

IlBoolean IlvAbstractScaleDisplayer::getCrossingValue ( IlDouble dataValue) const

Returns the data value to which the scale is actually fixed.

The returned value can be different from the one specified by the IlvAbstractScaleDisplayer::setCrossingValue() method, as it takes into account the actual coordinate range of the other scale.

To retrieve the specified crossing value, use the IlvAbstractScaleDisplayer::getStoredCrossingValue() method.

Parameters
dataValueThe data value to which the scale is actually fixed.
Returns
IlTrue if the scale is fixed to a data value and IlFalse otherwise.
Note
The returned value is meaningful only if the current scale is fixed to a data value on another scale (see the IlvAbstractScaleDisplayer::isFixedToPosition() method).
IlvDrawOrder IlvAbstractScaleDisplayer::getDrawOrder ( ) const

Returns the drawing order for the current scale.

The drawing order enables the scale to be drawn either above (IlvDrawAbove) or below (IlvDrawBelow) other graphical representations.

Returns
The drawing order for the current scale.
IlvCoordinateInfo* IlvAbstractScaleDisplayer::getInfoForCrossingValue ( ) const

Returns the coordinate information used to position the scale.

Returns
A pointer to the coordinate information object associated with the scale to which the current scale is fixed.
const char* IlvAbstractScaleDisplayer::getName ( ) const

Returns the name of the scale.

Returns
The name of the scale.
IlBoolean IlvAbstractScaleDisplayer::getRelativePosition ( IlvAxisPosition relPos,
IlvPos offset 
) const

Returns the relative position to which the scale is fixed.

Parameters
relPosThe parameter used to return the position relative to which the scale is fixed.
offsetThe parameter used to return the offset from the position relPos to which the scale is fixed.
Returns
IlTrue if the scale is fixed to a position and IlFalse otherwise.
See Also
isFixedToPosition().
Note
The returned values are meaningful only if the current scale is fixed to a position (see the IlvAbstractScaleDisplayer::isFixedToPosition() method).
IlDouble IlvAbstractScaleDisplayer::getStoredCrossingValue ( ) const

Returns the stored value to which the scale is fixed.

This value is the one that has been set with the IlvAbstractScaleDisplayer::setCrossingValue() method.

Returns
The stored value to which the scale is fixed.
See Also
getCrossingValue().
Note
The returned value is meaningful only if the current scale is fixed to a data value on another scale (see the IlvAbstractScaleDisplayer::isFixedToPosition() method).
IlBoolean IlvAbstractScaleDisplayer::isAlwaysVisible ( ) const

Indicates whether the current scale must always appear on the screen.

Returns
IlTrue if the current scale must always appear on the screen and IlFalse otherwise. If this method returns IlTrue and if the current scale is fixed to a data value that does not belong to the range of visible data, this range will be modified so that the scale can appear on the screen.
IlBoolean IlvAbstractScaleDisplayer::isFixedToPosition ( ) const

Indicates whether the scale is fixed to a position.

A scale can be either fixed to a position (see the IlvAbstractScaleDisplayer::setRelativePosition() method) or to a value from another scale (see the IlvAbstractScaleDisplayer::setCrossingValue method).

<code/code> if the scale is fixed to a position and IlFalse if it is fixed to a data value.

IlBoolean IlvAbstractScaleDisplayer::isInVisibleDataArea ( ) const

Indicates whether the scale is in the visible data area.

If the current scale is fixed to the data value of another scale, this method indicates whether this value belongs to the range of visible data. If this is not the case, the current scale does not appear and the method returns IlFalse.

Returns
IlTrue if the scale appears in the visible data area and IlFalse otherwise.
virtual IlBoolean IlvAbstractScaleDisplayer::isOnAbscissa ( ) const
pure virtual

Indicates whether the scale is connected to the abscissa coordinate system.

Returns
IlTrue if the scale represents the abscissa coordinate and IlFalse if it represents an ordinate coordinate.

Implemented in IlvSingleScaleDisplayer.

virtual IlBoolean IlvAbstractScaleDisplayer::isOnOrdinate ( ) const
pure virtual

Indicates whether the scale is connected to an ordinate coordinate system.

Returns
IlTrue if the scale represents an ordinate coordinate and IlFalse if it represents the abscissa coordinate.

Implemented in IlvSingleScaleDisplayer.

IlBoolean IlvAbstractScaleDisplayer::isVisible ( ) const

Indicates whether the scale is visible.

Returns
IlTrue if the scale is visible and IlFalse if it is hidden.
static IlvAbstractScaleDisplayer* IlvAbstractScaleDisplayer::Load ( IlvInputFile file)
static

Reads a scale object from a file.

Creates a scale instance from the description stored in the file file. The object description must have been written with the IlvAbstractScaleDisplayer::save() method.

Parameters
fileThe file where the object description is stored.
Returns
A pointer to the created object.
IlvOutputFile& IlvAbstractScaleDisplayer::save ( IlvOutputFile file) const

Writes a complete description of the current object in a file.

Writes the complete object description in a file. This description contains all the information necessary to read back this object with the IlvAbstractScaleDisplayer::Load() member function. This method first writes information regarding the type of the object and calls the IlvAbstractScaleDisplayer::write() method.

Parameters
fileThe file where the complete object description is written.
virtual void IlvAbstractScaleDisplayer::setAlwaysVisible ( IlBoolean  b)
virtual

Specifies whether the current scale must always appear on the screen.

Parameters
bThe new value of the Boolean indicating whether the current scale must always appear on the screen. If this Boolean is set to IlTrue and if the current scale is fixed to a data value that does not belong to the range of visible data, this range will be modified so that the scale can appear on the screen.
virtual void IlvAbstractScaleDisplayer::setArrowLength ( IlvDim  length)
pure virtual

Sets the arrow length.

Parameters
lengthThe new length of the arrow.
See Also
setAxisOriented().

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setArrowWidth ( IlvDim  width)
pure virtual

Sets the arrow width.

Parameters
widthThe new width of the arrow.
See Also
setAxisOriented().

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setAxisLabelOffset ( IlvDim  offset)
pure virtual

Sets the offset between the scale axis and its label.

Parameters
offsetThe new offset between the scale axis and its label.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setAxisLabelPalette ( IlvPalette pal)
pure virtual

Sets the palette used to draw the axis label.

This method locks the new palette and unlocks the previous one.

Parameters
palThe new palette.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setAxisOriented ( IlBoolean  oriented)
pure virtual

Indicates whether the scale should be oriented.

An oriented scale is drawn with an arrow at the end.

Parameters
orientedThe new value of the Boolean indicating whether the scale should be oriented.
See Also
setArrowWidth(), setArrowLength().

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setAxisPalette ( IlvPalette pal)
pure virtual

Sets the palette used to draw the axis.

This method locks the new palette and unlocks the previous one.

Parameters
palThe new palette.

Implemented in IlvSingleScaleDisplayer.

virtual IlBoolean IlvAbstractScaleDisplayer::setCrossingValue ( IlDouble  dataValue,
const IlvSingleScaleDisplayer ref 
)
virtual

Sets the data value to which this scale is fixed.

This method is used to attach the current scale to another one defined by ref. The dataValue parameter is used to specify the data value on ref to which the current scale is fixed.

Note
If dataValue is less than 1 and if a logarithmic transformer is applied to the corresponding coordinate, the value that will be actually stored will be 1. Otherwise, the stored value will be dataValue.
Parameters
dataValueThe new data value to which the scale is fixed.
refThe new scale to which the current scale is attached.
Returns
IlTrue if the scale was successfully fixed IlFalse otherwise.
virtual void IlvAbstractScaleDisplayer::setDrawOrder ( IlvDrawOrder  drawOrder)
virtual

Sets the drawing order for the current scale.

Parameters
drawOrderThe new drawing order.
See Also
getDrawOrder().
virtual void IlvAbstractScaleDisplayer::setGridDrawOrder ( IlvDrawOrder  drawOrder)
pure virtual

Sets the drawing order for the associated grid.

The drawing order enables the grid to be drawn either above (IlvDrawAbove) or below (IlvDrawBelow) other graphical representations. The grid and the scale can have different drawing orders. If no associated grid is defined, this method has no effect.

Parameters
drawOrderThe new drawing order for the associated grid.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setLabelLayout ( LabelLayout  layout)
pure virtual

Sets the label layout on the scale axis.

This layout applies to the step labels and the axis label. The actual result on the screen depends on the projector used and on the position of the axis.

Parameters
layoutThe new layout of the labels.
virtual void IlvAbstractScaleDisplayer::setLabelZoomFactor ( IlDouble  scale)
pure virtual

Sets the label scale factor.

(for internal use)

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setMajorTickSize ( IlvDim  size)
pure virtual

Sets the size of the major ticks.

Parameters
sizeThe new size of the major ticks.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setMinorTickSize ( IlvDim  size)
pure virtual

Sets the size of the minor ticks.

Parameters
sizeThe new size of the minor ticks.

Implemented in IlvSingleScaleDisplayer.

void IlvAbstractScaleDisplayer::setName ( const char *  name)

Sets the name of the scale.

Parameters
nameThe new name of the scale. The name passed as a parameter is copied.
virtual void IlvAbstractScaleDisplayer::setOffset ( IlvDim  dim)
pure virtual

Sets the offset between the ticks and the step labels.

Parameters
dimThe new offset between the ticks and the step labels.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setRelativePosition ( IlvAxisPosition  relPos,
IlvPos  offset = 0 
)
virtual

Sets the position to which this scale is fixed.

The scale is fixed at the offset offset relative to the position relPos. The resulting position in screen coordinates depends on the projector used and on the data display area.

Parameters
offsetThe new offset of the scale.
relPosThe new position relative to which the scale is fixed.
virtual void IlvAbstractScaleDisplayer::setStepLabel ( IlUInt  labelIndex,
const char *  label 
)
pure virtual

Sets the label for a given step by hand.

Parameters
labelIndexThe step index. If the index is invalid, the method does nothing.
labelThe new label for the step. This label is copied before being set and the old one is freed.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setStepLabelAngle ( IlDouble  angle)
pure virtual

Sets the angle of the step labels.

Parameters
angleThe new angle of the step labels.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setStepLabelFormat ( const char *  format,
IlBoolean  invalidate = IlTrue 
)
pure virtual

Sets the format used to translate data values into step labels.

Parameters
formatThe new format. The format parameter is copied and follows the same convention as the string formats used by the C primitives, such as printf().
invalidateIndicates whether the layout of the scale should be recomputed.
Note
The format is used in the IlvSingleScaleDisplayer::computeStepLabel() method.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setStepLabels ( IlUInt  count,
const char *const *  labels = 0 
)
pure virtual

Sets the step labels by hand.

The step labels can either be computed from their associated data values or manually specified by this method. The number of steps drawn by the scale is modified to match the count parameter.

Parameters
countThe number of labels.
labelsThe new labels. Each label of this array is copied before being set. Each label previously defined is freed.
See Also
computeStepLabel().

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setStepLabelsPalette ( IlvPalette pal)
pure virtual

Sets the palette used to draw the step labels.

This method locks the new palette and unlocks the previous one.

Parameters
palThe new palette.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setTickLayout ( TickLayout  layout)
pure virtual

Sets the tick layout on the scale axis.

This layout applies to both major and minor ticks. The actual result on the screen depends on the projector used and on the position of the axis.

Parameters
layoutThe new layout of the ticks.

Implemented in IlvSingleScaleDisplayer.

virtual void IlvAbstractScaleDisplayer::setValueToLabelCB ( IlvValueToLabelCB  cb,
IlAny  cbData = 0 
)
pure virtual

Sets a conversion callback between data values and step labels.

This method lets you specify a function that gives for a data value associated with a step the actual label that will be displayed for this step. The conversion callback is used by the IlvSingleScaleDisplayer::computeStepLabel() method.

Parameters
cbThe conversion callback.
cbDataAn optional parameter used to pass additional information to the callback.

Implemented in IlvSingleScaleDisplayer.

void IlvAbstractScaleDisplayer::setVisible ( IlBoolean  visible)

Sets the visibility of the scale.

Parameters
visibleThe new value of the Boolean indicating whether the scale is visible (IlTrue) or hidden (IlFalse).
virtual void IlvAbstractScaleDisplayer::write ( IlvOutputFile file) const
virtual

Writes the attributes of the current object in a file.

Called by the IlvAbstractScaleDisplayer::save() method. This method can be overloaded in subclasses that define new attributes. The information written by the write() method is read by the IO constructor, which takes an IlvInputFile as its only argument. Both this method and the IO constructor can be automatically declared by using the DeclareScaleDisplayerTypeInfo macro within the class declaration.

Parameters
fileThe file where the attributes of the current object are written.

Reimplemented in IlvSingleScaleDisplayer.


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