Base class defining a transformation to be applied to a coordinate. More...

#include <ilviews/charts/common.h>

Inheritance diagram for IlvCoordinateTransformer:

Public Member Functions
virtual	~IlvCoordinateTransformer ()
	Destructor. More...

virtual IlvCoordinateTransformer *	copy () const =0
	Virtual copy constructor. More...

const IlvCoordinateInfo *	getOwner () const
	Returns the coordinate information that owns the current object. More...

virtual IlBoolean	inverseTransformInterval (IlvCoordInterval &itvl) const
	Applies the inverse transformation to an interval. More...

virtual IlBoolean	inverseTransformPoints (IlUInt pointsCount, IlvDoublePoint *points) const
	Applies the inverse transformation to points. More...

virtual IlBoolean	inverseTransformValue (IlDouble &val) const =0
	Applies the inverse transformation to a value. More...

virtual IlBoolean	inverseTransformValues (IlUInt valuesCount, IlDouble *values) const
	Applies the inverse transformation to values. More...

IlvOutputFile &	save (IlvOutputFile &file) const
	Writes a complete description of the current object in a file. More...

virtual IlBoolean	transformInterval (IlvCoordInterval &itvl) const
	Applies a transformation to an interval. More...

virtual IlBoolean	transformPoints (IlUInt pointsCount, IlvDoublePoint *points) const
	Applies a transformation to data points. More...

virtual IlBoolean	transformValue (IlDouble &value) const =0
	Applies a transformation to a data value. More...

virtual IlBoolean	transformValues (IlUInt valuesCount, IlDouble *values) const
	Applies a transformation to data values. More...

virtual IlBoolean	validateInterval (IlvCoordInterval &interval) const
	Validates an interval. More...

virtual void	write (IlvOutputFile &file) const
	Writes the attributes of the current object in a file. More...

Static Public Member Functions
static IlvCoordinateTransformer *	Load (IlvInputFile &file)
	Reads a coordinate transformer object from a file. More...

Protected Member Functions
	IlvCoordinateTransformer ()
	Constructor. More...

	IlvCoordinateTransformer (const IlvCoordinateTransformer &transfo)
	Constructor. More...

	IlvCoordinateTransformer (IlvInputFile &file)
	Constructor. More...

Detailed Description

Base class defining a transformation to be applied to a coordinate.

Library: ilvcharts

This is an abstract class that allows you to specify a transformation that is applied to a given data coordinate (x, y, theta, or rho) represented by a scale. For example, by specifying the transformation to use, you can transform data values expressed in degrees Celsius to degrees Fahrenheit, thus displaying the values with a scale graduated in degrees Fahrenheit.

The IlvCoordinateTransformer object that is applied to a given coordinate is stored in a specific class named IlvCoordinateInfo. The IlvCoordinateInfo class stores all the information related to a given data coordinate which is represented by a scale. Therefore, we use the term "coordinate information" to describe every instance of the IlvCoordinateInfo class or one of its derived classes.

See also: IlvChartCoordinateTransformer, IlvCoordinateInfo, IlvDoublePoint.

Constructor & Destructor Documentation

§ ~IlvCoordinateTransformer()

virtual IlvCoordinateTransformer::~IlvCoordinateTransformer ( )

virtual

Destructor.

The destructor sets the stored pointer to the coordinate information object that owns the current object to 0.

§ IlvCoordinateTransformer() [1/3]

IlvCoordinateTransformer::IlvCoordinateTransformer ( )

protected

Constructor.

Initializes a new IlvCoordinateTransformer object.

§ IlvCoordinateTransformer() [2/3]

IlvCoordinateTransformer::IlvCoordinateTransformer ( const IlvCoordinateTransformer & transfo )

protected

Constructor.

Initializes a new IlvCoordinateTransformer object which is a copy of transfo.

Parameters

transfo The object used to initialize the current one.

§ IlvCoordinateTransformer() [3/3]

IlvCoordinateTransformer::IlvCoordinateTransformer ( IlvInputFile & file )

protected

Constructor.

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

Parameters

file	The file used to initialize the current object.

Member Function Documentation

§ copy()

virtual IlvCoordinateTransformer* IlvCoordinateTransformer::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 DeclareCoordinateTransformerTypeInfo macro. The IlvPredefinedCoordinateTransformerIOMembers macro lets you define a default implementation, which returns an instance initialized with the copy constructor.

Returns: A copy of the current object.

§ getOwner()

const IlvCoordinateInfo* IlvCoordinateTransformer::getOwner ( ) const

Returns the coordinate information that owns the current object.

Returns: A pointer to the coordinate information object that owns the current object.

§ inverseTransformInterval()

virtual IlBoolean IlvCoordinateTransformer::inverseTransformInterval ( IlvCoordInterval & itvl ) const

virtual

Applies the inverse transformation to an interval.

Parameters

itvl	This parameter stores the interval to transform inversely and is also used to return the interval once it has been inversely transformed.

Returns: IlTrue if the inverse transformation has been successfully applied and IlFalse otherwise.

§ inverseTransformPoints()

virtual IlBoolean IlvCoordinateTransformer::inverseTransformPoints	(	IlUInt	pointsCount,
		IlvDoublePoint *	points
	)		const

virtual

Applies the inverse transformation to points.

Parameters

pointsCount	The number of points to which the inverse transformation is applied.
points	This parameter stores the points to transform inversely and is also used to return the points once they have been inversely transformed.

Returns: IlTrue if the inverse transformation has been successfully applied and IlFalse otherwise.

Note: The inverse transformation is applied only to one coordinate of the points since the transformation is defined for one coordinate (x, y, theta, or rho) represented by a given scale.

Reimplemented in IlvZoomCoordinateTransformer, and IlvChartCoordinateTransformer.

§ inverseTransformValue()

virtual IlBoolean IlvCoordinateTransformer::inverseTransformValue ( IlDouble & val ) const

pure virtual

Applies the inverse transformation to a value.

Parameters

val	This parameter stores the value to transform inversely and is also used to return the value once it has been inversely transformed.

Returns: IlTrue if the inverse transformation has been successfully applied and IlFalse otherwise.

Implemented in IlvZoomCoordinateTransformer, and IlvChartCoordinateTransformer.

§ inverseTransformValues()

virtual IlBoolean IlvCoordinateTransformer::inverseTransformValues	(	IlUInt	valuesCount,
		IlDouble *	values
	)		const

virtual

Applies the inverse transformation to values.

Parameters

valuesCount	The number of values to which the inverse transformation is applied.
values	This parameter stores the values to transform inversely and is also used to return the values once they have been inversely transformed.

Returns: IlTrue if the inverse transformation has been successfully applied and IlFalse otherwise.

Reimplemented in IlvChartCoordinateTransformer.

§ Load()

static IlvCoordinateTransformer* IlvCoordinateTransformer::Load ( IlvInputFile & file )

static

Reads a coordinate transformer object from a file.

Creates a coordinate transformer instance from the description stored in the file file. The object description must have been written with the IlvCoordinateTransformer::save method.

Parameters

file	The file where the object description is stored.

Returns: A pointer to the created object.

§ save()

IlvOutputFile& IlvCoordinateTransformer::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 IlvCoordinateTransformer::Load member function. This method first writes information regarding the type of the object and calls the IlvCoordinateTransformer::write method.

Parameters

file	The file where the complete object description is written.

§ transformInterval()

virtual IlBoolean IlvCoordinateTransformer::transformInterval ( IlvCoordInterval & itvl ) const

virtual

Applies a transformation to an interval.

Parameters

itvl	This parameter stores the interval to transform and is also used to return the interval once it has been transformed.

Returns: IlTrue if the transformation has been successfully applied and IlFalse otherwise.

§ transformPoints()

virtual IlBoolean IlvCoordinateTransformer::transformPoints	(	IlUInt	pointsCount,
		IlvDoublePoint *	points
	)		const

virtual

Applies a transformation to data points.

Parameters

pointsCount	The number of points to which the transformation is applied.
points	This parameter stores the points to transform and is also used to return the transformed points.

Returns: IlTrue if the transformation has been successfully applied and IlFalse otherwise.

Note: The transformation is applied only to one coordinate of the points, since the transformation is defined for one coordinate (x, y, theta or rho) represented by a given scale.

Reimplemented in IlvZoomCoordinateTransformer, and IlvChartCoordinateTransformer.

§ transformValue()

virtual IlBoolean IlvCoordinateTransformer::transformValue ( IlDouble & value ) const

pure virtual

Applies a transformation to a data value.

Parameters

value This parameter stores the value to transform and is also used to return the transformed value.

Returns: IlTrue if the transformation has been successfully applied and IlFalse otherwise.

Implemented in IlvZoomCoordinateTransformer, and IlvChartCoordinateTransformer.

§ transformValues()

virtual IlBoolean IlvCoordinateTransformer::transformValues	(	IlUInt	valuesCount,
		IlDouble *	values
	)		const

virtual

Applies a transformation to data values.

Parameters

valuesCount	The number of values to which the transformation is applied.
values	This parameter stores the values to transform and is also used to return the transformed values.

Returns: IlTrue if the transformation has been successfully applied and IlFalse otherwise.

Reimplemented in IlvChartCoordinateTransformer.

§ validateInterval()

virtual IlBoolean IlvCoordinateTransformer::validateInterval ( IlvCoordInterval & interval ) const

virtual

Validates an interval.

Changes the interval interval so that it becomes consistent with the definition domain of the transformer. The default implementation does nothing and returns IlFalse, which indicates that the interval has not been modified.

Parameters

interval The interval to validate.

Returns: A Boolean value indicating whether the interval has been modified.

Reimplemented in IlvZoomCoordinateTransformer, and IlvChartCoordinateTransformer.

§ write()

virtual void IlvCoordinateTransformer::write ( IlvOutputFile & file ) const

virtual

Writes the attributes of the current object in a file.

Called by the IlvCoordinateTransformer::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 DeclareCoordinateTransformerTypeInfo macro within the class declaration.

Parameters

file	The file where the attributes of the current object are written.

Reimplemented in IlvChartCoordinateTransformer.

Public Member Functions

Static Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

§ ~IlvCoordinateTransformer()

§ IlvCoordinateTransformer() [1/3]

§ IlvCoordinateTransformer() [2/3]

§ IlvCoordinateTransformer() [3/3]

Member Function Documentation

§ copy()

§ getOwner()

§ inverseTransformInterval()

§ inverseTransformPoints()

§ inverseTransformValue()

§ inverseTransformValues()

§ Load()

§ save()

§ transformInterval()

§ transformPoints()

§ transformValue()

§ transformValues()

§ validateInterval()

§ write()