IlvChartDataInteractor Class Reference

Abstract base class for chart data manipulation. More...

#include <ilviews/charts/chartint.h>

Inheritance diagram for IlvChartDataInteractor:

Public Types
enum	PickingMode

Public Member Functions
PickingMode	getPickingMode () const
	Returns the current picking mode of the interactor. More...
void	setPickingMode (PickingMode m)
	Sets the current picking mode of the interactor. More...
Public Member Functions inherited from IlvChartInteractor
virtual void	endSequence (IlvChartGraphic *chart, const IlvEvent &event, const IlvTransformer *t)
	Performs the actions needed when an interactor leaves an event sequence. More...
virtual IlBoolean	handleEvent (IlvGraphic *chart, IlvEvent &event, const IlvTransformer *t=0)=0
	Handles events received by the interactor. More...
IlBoolean	isShared () const
	Indicates whether the current object is a shared instance. More...
virtual IlBoolean	isShowingAbscissaCursor () const
	Indicates whether the interactor uses a cursor on the abscissa. More...
virtual IlBoolean	isShowingOrdinateCursor () const
	Indicates whether the interactor uses a cursor on the ordinate. More...
virtual void	startSequence (IlvChartGraphic *chart, const IlvEvent &event, const IlvTransformer *t)
	Performs the actions needed when an interactor enters an event sequence. More...

Static Public Member Functions
static IlvDim	GetPrecision ()
	Returns the precision used to find the data point corresponding to a given screen point. More...
static void	SetPrecicion (IlvDim dim)
	Deprecated misspelling of SetPrecision()
static void	SetPrecision (IlvDim dim)
	Sets the precision used to find the data point corresponding to a given screen point. More...
Static Public Member Functions inherited from IlvChartInteractor
static IlvChartInteractor *	Get (const char *name)
	Returns a shared interactor instance. More...

Protected Member Functions
	IlvChartDataInteractor ()
	Constructor. More...
IlvChartDataSet *	getHandledDataSet () const
	Returns the handled data set. More...
IlvAbstractChartDisplayer *	getHandledDisplayer () const
	Returns the chart displayer representing the handled data. More...
IlUInt	getHandledPointIndex () const
	Returns the index of the handled data point. More...
IlBoolean	isHandlingData () const
	Checks whether valid information about a data point has been stored. More...
virtual IlBoolean	queryData (IlvChartGraphic *chart, IlvPoint &evp, const IlvTransformer *t)
	Retrieves and stores information about a data point. More...
Protected Member Functions inherited from IlvChartInteractor
	IlvChartInteractor ()
	Constructor. More...

Detailed Description

Abstract base class for chart data manipulation.

Library: ilvcharts

This class provides an interface for querying and storing information about the data point corresponding to a given event location in the chart data area.

Member Enumeration Documentation

enum IlvChartDataInteractor::PickingMode

The picking mode defines how a data point is retrieved by the queryData() method.

ItemPicking: this method takes into account the whole displayed item (like a bar for instance).

NearestPointPicking: only the projected data point is taken into account.

Constructor & Destructor Documentation

IlvChartDataInteractor::IlvChartDataInteractor ( )

protected

Constructor.

Initializes a new IlvChartDataInteractor object.

Member Function Documentation

IlvChartDataSet* IlvChartDataInteractor::getHandledDataSet ( ) const

protected

Returns the handled data set.

Returns

The handled data set.

IlvAbstractChartDisplayer* IlvChartDataInteractor::getHandledDisplayer ( ) const

protected

Returns the chart displayer representing the handled data.

Returns

The chart displayer representing the handled data.

IlUInt IlvChartDataInteractor::getHandledPointIndex ( ) const

protected

Returns the index of the handled data point.

Returns

The index of the handled data point.

PickingMode IlvChartDataInteractor::getPickingMode

(

)

const

Returns the current picking mode of the interactor.

See Also

PickingMode

static IlvDim IlvChartDataInteractor::GetPrecision ( )

static

Returns the precision used to find the data point corresponding to a given screen point.

Returns

The precision used to find the data point corresponding to a given screen point.

Note

The returned value indicates the maximum distance that is considered from a given view point to find the nearest displayed data point. The precision is set by default to the value returned by the IlvGetDeltaLine() function.

IlBoolean IlvChartDataInteractor::isHandlingData ( ) const

protected

Checks whether valid information about a data point has been stored.

Returns

IlTrue if valid information about a data point has been stored.

virtual IlBoolean IlvChartDataInteractor::queryData ( IlvChartGraphic *  chart, IlvPoint &  evp, const IlvTransformer *  t  )

protectedvirtual

Retrieves and stores information about a data point.

Given an event location, the closest projected data point is retrieved from the chart. This method stores the following information about the considered data point:

• The chart displayer representing this data point
• The data series
• The index of the data point in the series

Parameters

chart	The considered chart.
evp	The event location in view coordinates.
t	The transformer applied to the view in which the event occurred.

Returns

IlTrue if a data point projection was near the event location.

See Also

getHandledDisplayer, getHandledDataSet, getHandledPointIndex.

void IlvChartDataInteractor::setPickingMode

(

PickingMode

m

)

Sets the current picking mode of the interactor.

See Also

PickingMode

static void IlvChartDataInteractor::SetPrecision ( IlvDim  dim )

static

Sets the precision used to find the data point corresponding to a given screen point.

The precision used to find the data point corresponding to a given screen point is set to dim.

Note

This value indicates the maximum distance that is considered from a given view point to find the nearest displayed data point. The precision is set by default to the value returned by the IlvGetDeltaLine() function.