IlvZoomCoordinateTransformer Class Reference

Class for computing the graduations of a scale. More...

#include <ilviews/charts/scaledis.h>

Inheritance diagram for IlvZoomCoordinateTransformer:

Public Member Functions
	IlvZoomCoordinateTransformer (const IlvCoordInterval &zoomWindow, IlDouble zoomFactor, IlBoolean continuous=IlTrue)
	Constructor. More...
void	getTransformedWindow (IlvCoordInterval &itv) const
	Applies the zoom factor to the interval of data that is displayed as zoomed. More...
IlDouble	getZoomFactor () const
	Returns the zoom factor. More...
const IlvCoordInterval &	getZoomWindow () const
	Returns the interval of data that is displayed as zoomed. More...
virtual IlBoolean	inverseTransformPoints (IlUInt pointsCount, IlvDoublePoint *points) const
	Applies the inverse transformation to points. More...
virtual IlBoolean	inverseTransformValue (IlDouble &value) const
	Applies the inverse transformation to a value. More...
IlBoolean	isContinuous () const
	Indicates whether the transition between the zoomed data and the nonzoomed data is continuous. More...
void	setContinuous (IlBoolean continuous)
	Specifies whether the transition between the zoomed data and the nonzoomed data is continuous. More...
IlBoolean	setZoomFactor (IlDouble zoomFactor)
	Sets the zoom factor. More...
IlBoolean	setZoomWindow (const IlvCoordInterval &window)
	Sets the interval of data that is displayed as zoomed. More...
IlBoolean	setZoomWindow (IlDouble start, IlDouble end)
	Sets the interval of data that is displayed as zoomed. More...
virtual IlBoolean	transformPoints (IlUInt pointsCount, IlvDoublePoint *points) const
	Applies a transformation to data points. More...
virtual IlBoolean	transformValue (IlDouble &value) const
	Applies a transformation to a data value. More...
virtual IlBoolean	validateInterval (IlvCoordInterval &interval) const
	Validates an interval. More...
Public Member Functions inherited from IlvCoordinateTransformer
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	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	transformValues (IlUInt valuesCount, IlDouble *values) const
	Applies a transformation to data values. More...
virtual void	write (IlvOutputFile &file) const
	Writes the attributes of the current object in a file. More...

Additional Inherited Members
Static Public Member Functions inherited from IlvCoordinateTransformer
static IlvCoordinateTransformer *	Load (IlvInputFile &file)
	Reads a coordinate transformer object from a file. More...
Protected Member Functions inherited from IlvCoordinateTransformer
	IlvCoordinateTransformer ()
	Constructor. More...
	IlvCoordinateTransformer (const IlvCoordinateTransformer &transfo)
	Constructor. More...
	IlvCoordinateTransformer (IlvInputFile &file)
	Constructor. More...

Detailed Description

Class for computing the graduations of a scale.

Library: ilvcharts

IlvZoomCoordinateTransformer is a subclass of IlvCoordinateTransformer that allows you to define a transformation that is applied locally to a part of the data. This allows you to display these data as zoomed.

Warning

If a zoom coordinate transformer is set on a given coordinate, a zoom scale steps updater (an instance of the IlvZoomScaleStepsUpdater class) must also be set on the scale representing this coordinate in order to compute the corresponding graduations for the scale.

See Also

IlvCoordinateTransformer.

Constructor & Destructor Documentation

IlvZoomCoordinateTransformer::IlvZoomCoordinateTransformer	(	const IlvCoordInterval &	zoomWindow,
		IlDouble	zoomFactor,
		IlBoolean	continuous = IlTrue
	)

Constructor.

Initializes a new IlvZoomCoordinateTransformer object.

Parameters

zoomWindow	The interval on which the data are displayed as zoomed.
zoomFactor	The zoom factor that is applied to the data belonging to the interval zoomWindow.
continuous	A Boolean indicating whether the transition between the zoomed area and the nonzoomed area is continuous.

Member Function Documentation

void IlvZoomCoordinateTransformer::getTransformedWindow

(

IlvCoordInterval &

itv

)

const

Applies the zoom factor to the interval of data that is displayed as zoomed.

Parameters

itv	Returns the interval of data that is displayed as zoomed, once it has been transformed by the zoom factor.

IlDouble IlvZoomCoordinateTransformer::getZoomFactor

(

)

const

Returns the zoom factor.

Returns

The zoom factor that is applied to the data that are displayed as zoomed.

const IlvCoordInterval& IlvZoomCoordinateTransformer::getZoomWindow

(

)

const

Returns the interval of data that is displayed as zoomed.

Returns

The interval for which the data are displayed as zoomed.

virtual IlBoolean IlvZoomCoordinateTransformer::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.

Warning

[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 from IlvCoordinateTransformer.

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

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.

Implements IlvCoordinateTransformer.

IlBoolean IlvZoomCoordinateTransformer::isContinuous

(

)

const

Indicates whether the transition between the zoomed data and the nonzoomed data is continuous.

Returns

IlTrue if the transition between the zoomed data and the nonzoomed data is continuous and IlFalse otherwise.

void IlvZoomCoordinateTransformer::setContinuous

(

IlBoolean

continuous

)

Specifies whether the transition between the zoomed data and the nonzoomed data is continuous.

Parameters

continuous

The new value of the flag indicating whether the transition between the zoomed data and the nonzoomed data is continuous.

IlBoolean IlvZoomCoordinateTransformer::setZoomFactor

(

IlDouble

zoomFactor

)

Sets the zoom factor.

Parameters

zoomFactor

The new zoom factor that is applied to the data that are displayed as zoomed.

IlBoolean IlvZoomCoordinateTransformer::setZoomWindow

(

const IlvCoordInterval &

window

)

Sets the interval of data that is displayed as zoomed.

Parameters

window

The new interval for which the data are displayed as zoomed.

IlBoolean IlvZoomCoordinateTransformer::setZoomWindow	(	IlDouble	start,
		IlDouble	end
	)

Sets the interval of data that is displayed as zoomed.

Parameters

start	The beginning of the interval for which the data are displayed as zoomed.
end	The end of the interval for which the data are displayed as zoomed.

virtual IlBoolean IlvZoomCoordinateTransformer::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.

Warning

[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 from IlvCoordinateTransformer.

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

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.

Implements IlvCoordinateTransformer.

virtual IlBoolean IlvZoomCoordinateTransformer::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 from IlvCoordinateTransformer.