IlvLogScaleStepsUpdater Class Reference

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

#include <ilviews/charts/scaledis.h>

Inheritance diagram for IlvLogScaleStepsUpdater:

Public Member Functions
	IlvLogScaleStepsUpdater (IlvSingleScaleDisplayer *scale)
	Constructor. More...
virtual IlBoolean	checkRange (IlvCoordInterval &range) const
	Checks whether an interval is valid with respect to the step definition. More...
virtual char *	computeStepLabel (IlDouble value) const
	Computes and returns the label displayed for a given data value. More...
virtual void	getStepSubStepValues (const IlvProjectorArea &area, IlUInt &stepsCount, IlDouble *&stepValues, IlUInt &subStepsCount, IlDouble *&subStepValues) const
	Computes and returns the step and substep values for the associated scale. More...
Public Member Functions inherited from IlvScaleStepsUpdater
IlvCoordinateInfo *	getCoordinateInfo () const
	Deprecated More...
IlvSingleScaleDisplayer *	getScale () const
	Returns the scale associated with the current scale steps updater. More...

Additional Inherited Members
Static Public Member Functions inherited from IlvScaleStepsUpdater
static IlvScaleStepsUpdater *	Get (const IlvSingleScaleDisplayer *scale)
	Returns the scale steps updater set on a given scale. More...
static IlvScaleStepsUpdater *	Remove (IlvSingleScaleDisplayer *scale)
	Removes the scale steps updater set on a given scale. More...
static IlvScaleStepsUpdater *	Set (IlvSingleScaleDisplayer *scale, IlvScaleStepsUpdater *updater)
	Sets a scale steps updater on a given scale. More...
Protected Member Functions inherited from IlvScaleStepsUpdater
	IlvScaleStepsUpdater (IlvSingleScaleDisplayer *scale)
	Constructor. More...

Detailed Description

Class for computing the graduations of a scale.

Library: ilvcharts

IlvLogScaleStepsUpdater is a subclass of IlvScaleStepsUpdater that computes logarithmic graduations.

Warning

This class must be used to compute the steps for a given scale only when a logarithmic transformation is set on the coordinate represented by the scale.

See also

IlvScaleStepsUpdater, IlvSingleScaleDisplayer.

Constructor & Destructor Documentation

IlvLogScaleStepsUpdater()

IlvLogScaleStepsUpdater::IlvLogScaleStepsUpdater

(

IlvSingleScaleDisplayer *

scale

)

Constructor.

Initializes a new IlvLogScaleStepsUpdater object.

Member Function Documentation

checkRange()

virtual IlBoolean IlvLogScaleStepsUpdater::checkRange ( IlvCoordInterval &  range ) const

virtual

Checks whether an interval is valid with respect to the step definition.

Called whenever the range of the coordinate associated with the current scale is modified. With this method, you can modify the interval range so that it becomes consistent with the steps definition. The default implementation simply returns IlTrue.

Parameters

range

The range to check.

Returns

IlFalse if the range was not correct and had to be modified, and IlTrue otherwise.

Reimplemented from IlvScaleStepsUpdater.

computeStepLabel()

virtual char* IlvLogScaleStepsUpdater::computeStepLabel ( IlDouble  value ) const

virtual

Computes and returns the label displayed for a given data value.

Parameters

value

The data value for which the label to be displayed is computed.

Reimplemented from IlvScaleStepsUpdater.

getStepSubStepValues()

virtual void IlvLogScaleStepsUpdater::getStepSubStepValues ( const IlvProjectorArea &  area, IlUInt &  stepsCount, IlDouble *&  stepValues, IlUInt &  subStepsCount, IlDouble *&  subStepValues  ) const

virtual

Computes and returns the step and substep values for the associated scale.

Parameters

area	The data area definition. This data area definition can be retrieved with the IlvChartGraphic::getProjectorArea() method.
stepsCount	Returns the number of major steps.
stepValues	Returns the values associated with the major steps.
subStepsCount	Returns the number of minor steps.
subStepValues	Returns the values associated with the minor steps.

Implements IlvScaleStepsUpdater.