Class for polyline displayers. More...

#include <ilviews/charts/polyline.h>

Inheritance diagram for IlvPolylineChartDisplayer:

Public Member Functions
	IlvPolylineChartDisplayer (IlvPalette *palette=0)
	Constructor. More...

virtual	~IlvPolylineChartDisplayer ()
	Destructor. More...

virtual IlBoolean	canBeProjectedIfOutOfBounds () const
	Indicates whether the graphical representation can be projected when it is out-of-bounds. More...

virtual void	drawLegendItem (IlvPort dst, const IlvRect &legendArea, IlvPalette itemPal, const IlvRegion *clip, IlAny clientData=0) const
	Draws the graphic part of a legend item associated with the current displayer. More...

virtual IlvPalette *	getProjectedPointsPalette () const
	Returns the palette used to display out-of-bounds values. More...

virtual IlBoolean	graphicalRepresentationByDataPoint () const
	Indicates whether there is a graphical representation by data point. More...

virtual IlBoolean	isContinuous () const
	Indicates whether the graphical representation is continuous. More...

void	setProjectedPointsPalette (IlvPalette *palette)
	Sets the palette used to display out-of-bounds values. More...

virtual void	treatPointsOutOfAbscissaLimits (const IlvRect &dataDisplayArea, IlvChartDisplayerPoints *dispPts, const IlvCoordInterval &abscissaRange, const IlvPoint &minLimit, const IlvPoint &maxLimit) const
	Treats the occurrence of the points in screen coordinates that are outside the abscissa limits. More...

Public Member Functions inherited from IlvSingleChartDisplayer
virtual	~IlvSingleChartDisplayer ()
	Destructor. More...

virtual IlvChartDisplayerPoints *	allocDisplayerPoints () const
	Allocates and returns an `IlvChartDisplayerPoints` object. More...

virtual IlBoolean	boundingBox (IlvRect &bbox, const IlvTransformer *t=0) const
	Returns the bounding box of the graphical representation of data. More...

virtual IlBoolean	dataPointBBox (IlUInt dataPtIdx, IlvRect &bbox, IlBoolean takeInfoIntoAccount=IlTrue, const IlvTransformer *t=0) const
	Returns the bounding box of the graphical representation of the data points at a given index. More...

virtual void	draw (IlvPort dst, const IlvTransformer t=0, const IlvRegion *clip=0) const
	Draws the graphical representation of data. More...

virtual void	drawDataPoint (IlUInt dataPtIdx, IlvPort dst, const IlvTransformer t=0, const IlvRegion *clip=0) const
	Draws the graphical representation of the data point(s) at a given index. More...

virtual void	drawDataPoints (IlUInt iMin, IlUInt iMax, IlvPort dst, const IlvTransformer t=0, const IlvRegion *clip=0) const
	Draws the graphical representation of the data points between a given interval. More...

virtual void	drawFill (IlBoolean b)
	Sets the filling mode of the displayer. More...

virtual IlvColor *	getBackground (IlUInt index=0) const
	Returns the background color of a palette used by the current displayer to display data. More...

virtual void	getClipArea (IlvRect &area, const IlvTransformer *t) const
	Returns the clipping region that is used for the drawing. More...

void	getDataDisplayArea (IlvRect &dataDisplayArea, const IlvTransformer *t=0) const
	Returns the bounds of the data display area. More...

IlvChartDisplayerPointsFactory *	getDisplayerPointsFactory () const
	Returns the factory used to create `IlvChartDisplayerPoints` instances. More...

virtual IlUInt	getDisplayersCount () const
	Returns the number of displayers. More...

virtual IlUInt	getDisplayItem (IlvChartDataSet &dataSet, const IlvPoint &viewPoint, const IlvTransformer t) const
	Returns the item to which a view point corresponds. More...

virtual IlBoolean	getDisplayPoint (const IlvChartDataSet dataSet, IlUInt dataPtIdx, IlvPoint &point, const IlvTransformer t=0) const
	Returns the corresponding screen point for a data point. More...

virtual IlvColor *	getForeground (IlUInt index=0) const
	Returns the foreground color of a palette used by the current displayer to display data. More...

virtual const char *	getInternalLegendText (IlUInt index=0) const
	Returns the legend text stored in the current displayer. More...

virtual const char *	getLegendText (IlUInt index=0) const
	Returns the text that will be used in a legend for the current displayer. More...

virtual IlUInt	getNearestPoint (IlvChartDataSet &dataSet, const IlvPoint &viewPoint, IlvDim distance, IlvPoint &point, const IlvTransformer t=0) const
	Returns the nearest data point. More...

virtual IlvPalette *	getPalette (IlUInt=0) const
	Returns a palette used by the current displayer to display data. More...

virtual IlvPointInfoCollection *	getPointInfoCollection (const IlvChartDataSet *dataSet) const
	Returns the point information collection defined to be used to display a given data set. More...

IlvPos	getShiftOffset () const
	Returns the offset by which the graphical representation of data is shifted along the base of the chart. More...

virtual IlvDim	getSizeAlongBase () const
	Returns the size along the base for the graphical representation of a given data point. More...

IlBoolean	isDrawingFill () const
	Returns the filling mode for the current displayer. More...

virtual void	releaseDisplayerPoints (IlvChartDisplayerPoints *dispPts) const
	Releases an `IlvChartDisplayerPoints` object used by the current displayer. More...

virtual void	setBackground (IlvColor *color, IlUInt index=0)
	Sets the background color of a palette used by the current displayer to display data. More...

virtual IlBoolean	setDataPoint (IlvChartDataSet dataSet, IlUInt dataPtIdx, const IlvPoint &point, const IlvTransformer t=0) const
	Sets the corresponding data point from a screen point. More...

IlvChartDisplayerPointsFactory *	setDisplayerPointsFactory (IlvChartDisplayerPointsFactory *factory)
	Sets the factory used to create `IlvChartDisplayerPoints` instances. More...

virtual void	setForeground (IlvColor *color, IlUInt index=0)
	Sets the foreground color of a palette used by the current displayer to display data. More...

virtual void	setLegendItems (IlvChartLegend *legend) const
	Sets the legend items associated with the current displayer. More...

virtual void	setLegendText (const char *text, IlUInt index=0)
	Sets the text that will be used in a legend for the current displayer. More...

virtual void	setMode (IlvDrawMode mode)
	Sets the drawing mode. More...

virtual void	setOverwrite (IlBoolean o)
	Sets the overwrite mode. More...

virtual void	setPalette (IlvPalette *pal, IlUInt index=0)
	Sets a palette used by the current displayer to display data. More...

virtual void	setPointInfoCollection (const IlvChartDataSet dataSet, IlvPointInfoCollection ptInfoCollection)
	Sets the point information collection that will be used to display a given data set. More...

void	setShiftOffset (IlvPos offset)
	Sets the offset by which the graphical representation of data is shifted along the base of the chart. More...

virtual IlBoolean	usePointInfo () const
	Indicates whether point information collections are defined. More...

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

Public Member Functions inherited from IlvAbstractChartDisplayer
virtual	~IlvAbstractChartDisplayer ()
	Destructor. More...

void	addDataSet (IlvChartDataSet *dataSet)
	Adds a real data set to be displayed by the current displayer. More...

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

IlBoolean	dataPointToDisplay (const IlvDoublePoint &dataPoint, IlvPoint &point, const IlvTransformer *t=0) const
	Projects a data point into screen coordinates. More...

virtual IlBoolean	displayDataSet (const IlvChartDataSet *dataSet) const
	Indicates whether the current displayer displays a data set. More...

IlBoolean	displayToDataPoint (const IlvPoint &point, IlvDoublePoint &dataPoint, const IlvTransformer *t=0) const
	Inversely projects a screen point to retrieve the corresponding data point. More...

IlvChartGraphic *	getChartGraphic () const
	Returns the chart graphic which uses the current displayer. More...

IlvChartDataSet *	getDataSet (IlUInt index=0) const
	Returns a data set used by the current displayer. More...

IlUInt	getDataSetsCount () const
	Returns the number of data sets used by the current displayer. More...

IlUInt	getMaxDataSetsCount () const
	Returns the maximum number of real data sets that the current displayer is allowed to display. More...

const char *	getName () const
	Returns the name of the current displayer. More...

IlvCoordinateInfo *	getOrdinateInfo () const
	Deprecated Returns the coordinate information associated with the ordinate scale considered to display data. More...

const IlvCompositeChartDisplayer *	getParentDisplayer () const
	Returns the parent displayer. More...

virtual IlvChartDataPointInfo *	getPointInfo (IlUInt dataPtIdx, const IlvChartDataSet *dataSet=0) const
	Returns the point information associated with a given data point. More...

IlvChartDataSet *	getRealDataSet (IlUInt index=0) const
	Returns a real data set to be displayed by the current displayer. More...

IlUInt	getRealDataSetsCount () const
	Returns the number of real data sets. More...

virtual IlvCombinedChartDataSet *	getVirtualDataSet (const IlvChartDataSet *dataSet, IlUInt &index) const
	Returns a virtual data set used by the current displayer. More...

virtual void	insertDataSet (IlvChartDataSet *dataSet, IlUInt index=IlvLastPositionIndex)
	Inserts a real data set to be displayed by the current displayer. More...

virtual IlBoolean	isFilled () const
	Indicates whether the graphical representation is filled. More...

virtual IlBoolean	isViewable () const
	Indicates whether the graphical representation can be viewed. More...

IlBoolean	isVisible () const
	Indicates whether the graphical representation is visible. More...

virtual void	removeDataSet (IlvChartDataSet *dataSet)
	Removes a real data set from the data sets to be displayed by the current displayer. More...

virtual void	removeDataSets ()
	Removes all the real data sets to be displayed by the current displayer.

void	removePointInfoCollection (const IlvChartDataSet *dataSet)
	Removes the point information collection defined to be used to display a given data set. More...

virtual IlBoolean	replaceDataSet (IlvChartDataSet oldDataSet, IlvChartDataSet newDataSet)
	Replaces a real data set with another one. More...

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

virtual void	setChartGraphic (IlvChartGraphic *chart)
	Sets the chart graphic which uses the current displayer. More...

virtual void	setDataSet (IlvChartDataSet *dataSet, IlUInt index=0)
	Sets a real data set to be displayed by the current displayer. More...

void	setDataSet (IlvChartDataSet dataSet, IlvPalette palette, IlUInt index=0)
	Sets a real data set to be displayed by the current displayer. More...

virtual void	setDataSets (IlUInt count, IlvChartDataSet const dataSets)
	Sets the real data sets to be displayed by the current displayer. More...

void	setName (const char *name)
	Sets the name of the current displayer. More...

virtual void	setOrdinateInfo (IlvCoordinateInfo *ordinateInfo)
	Sets the coordinate information associated with the ordinate scale considered to display data. More...

void	setParentDisplayer (const IlvCompositeChartDisplayer *displayer)
	Sets the parent displayer. More...

void	setVirtualDataSet (IlvCombinedChartDataSet *vDataSet, IlUInt index=0)
	Sets a virtual data set used by the current displayer. More...

void	setVisible (IlBoolean visible)
	Specifies whether the graphical representation is visible. More...

virtual IlBoolean	useVirtualDataSets () const
	Indicates whether the current displayer uses virtual data sets. More...

Protected Member Functions
virtual void	computeItem (const IlvChartDisplayerPoints dispPts, IlUInt pointIndex, IlUInt &usedPointsCount, IlvPoint points, const IlvTransformer *t=0) const
	Computes the item that will be displayed for a given point in screen coordinates corresponding to a data point to display. More...

virtual void	drawItem (const IlvChartDisplayerPoints , IlUInt pointIndex, IlUInt pointCount, IlvPoint points, IlvPalette itemPalette, IlvPort dst, const IlvTransformer t=0, const IlvRegion clip=0) const
	Draws the item for a given point in screen coordinates corresponding to a data point to display. More...

virtual void	drawPoints (IlvChartDisplayerPoints dispPts, IlvPort dst, const IlvTransformer t=0, const IlvRegion clip=0) const
	Draws the graphical representation from points in screen coordinates corresponding to the data points to display. More...

virtual IlUInt	getItemPointsCount (const IlvChartDisplayerPoints *dispPts) const
	Returns the maximum number of points needed to define an item for the current displayer. More...

virtual IlvDoublePoint *	selectDataPointsForPoint (IlUInt dataPointIndex, IlUInt &count, IlUInt *&dataPointIndexes) const
	Selects and returns the data points needed to display the graphical representation of the data points at a given index in the real data set(s) to be displayed by the current displayer. More...

Protected Member Functions inherited from IlvSingleChartDisplayer
	IlvSingleChartDisplayer (IlvPalette *palette=0)
	Constructor. More...

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

	IlvSingleChartDisplayer (const IlvSingleChartDisplayer &displayer)
	Constructor. More...

virtual void	boundingBoxOfItem (const IlvChartDisplayerPoints displayerPoints, IlUInt pointIndex, IlUInt pointsCount, IlvPoint points, IlvRect &bbox, IlBoolean takeInfoIntoAccount=IlTrue, const IlvTransformer *t=0) const
	Returns the bounding box of the item drawn for a given point in screen coordinates corresponding to a data point to display. More...

IlBoolean	boundingBoxOfPart (const IlvCoordInterval &abscissaRange, IlBoolean shiftOfCycleLength, IlvRect &partBBox, IlBoolean takeInfoIntoAccount, const IlvTransformer *t=0) const
	Returns the bounding box of a part of the graphical representation of data. More...

virtual void	boundingBoxOfPoints (IlvChartDisplayerPoints displayerPoints, IlvRect &bbox, IlBoolean takeInfoIntoAccount=IlTrue, const IlvTransformer t=0) const
	Returns the bounding box of the graphical representation of projected points. More...

virtual IlBoolean	computeLimitsForDataSelection (const IlvRect &clipRect, const IlvCoordInterval &abscissaRange, const IlvCoordInterval &ordinateRange, IlvCoordInterval &abscissaSelectionRange, IlvCoordInterval &ordinateSelectionRange, IlBoolean &dataToSelect, const IlvTransformer *t=0) const
	Computes the abscissa and ordinate intervals used to select the data to be displayed in a given rectangle. More...

void	drawPart (const IlvCoordInterval &abscissaRange, IlBoolean shiftOfCycleLength, IlvPort dst, const IlvTransformer t=0, const IlvRegion *clip=0) const
	Draws a part of the graphical representation of data. More...

virtual void	drawPointInfos (const IlvChartDisplayerPoints displayerPoints, IlvPort dst, const IlvTransformer t=0, const IlvRegion clip=0, const IlvChartDataSet *dataSet=0) const
	Draws the point information defined for the data points to be displayed. More...

IlUInt	getNearestPointInsidePart (const IlvCoordInterval &abscissaRange, IlBoolean shiftOfCycleLength, IlvChartDataSet &dataSet, const IlvPoint &viewPoint, IlvDim distance, IlvPoint &point, const IlvTransformer t=0) const
	Returns the nearest data point within a given abscissa range. More...

virtual IlUInt	pointsContains (const IlvPoint &viewPoint, IlvChartDisplayerPoints , const IlvTransformer t=0) const
	Returns the index of the data point of which the corresponding displayer item holds viewPoint.

virtual IlvDoublePoint *	selectDataPointsForRange (const IlvCoordInterval &abscissaRange, IlUInt &pointCount, IlUInt &dataPtIdxes, const IlvTransformer t=0, const IlvRect *clip=0) const
	Selects And returns the data points to display that are within a given abscissa interval. More...

virtual IlvDoublePoint *	selectDataPointsInRect (IlUInt &pointCount, IlUInt &dataPtIndexes, IlvRect pickRect, const IlvTransformer t=0) const
	Selects the data points that are rendered within a rectangle. More...

Protected Member Functions inherited from IlvAbstractChartDisplayer
	IlvAbstractChartDisplayer ()
	Constructor. More...

	IlvAbstractChartDisplayer (const IlvAbstractChartDisplayer &displayer)
	Constructor. More...

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

virtual void	dataSetAdded (IlUInt position=IlvLastPositionIndex)
	Performs the updates needed when a real data set is added. More...

virtual void	dataSetRemoved (IlUInt index)
	Performs the updates needed when a real data set is removed. More...

virtual void	update ()
	Performs the updates needed when modifications (removing, adding, replacing) are made to the real data sets.

virtual void	updateVirtualDataSets ()
	Updates the virtual data sets. More...

Additional Inherited Members
Static Public Member Functions inherited from IlvAbstractChartDisplayer
static IlvAbstractChartDisplayer *	Load (IlvInputFile &file)
	Reads a displayer object from a file. More...

Detailed Description

Class for polyline displayers.

Library: ilvcharts

This class is a subclass of IlvSingleChartDisplayer that allows you to represent data with a polyline.

The polyline displayer displays a unique data set. This displayer can be used with any type of projection. (See the IlvAbstractProjector class for more details.)

The following images show data sets represented with polyline displayers in a Cartesian chart (on the left) and a polar chart (on the right).

See also: IlvSingleChartDisplayer.

Constructor & Destructor Documentation

§ IlvPolylineChartDisplayer()

IlvPolylineChartDisplayer::IlvPolylineChartDisplayer ( IlvPalette * palette = 0 )

Constructor.

Initializes a new IlvPolylineChartDisplayer object.

Parameters

palette The palette that will be used to display the polyline.

§ ~IlvPolylineChartDisplayer()

virtual IlvPolylineChartDisplayer::~IlvPolylineChartDisplayer ( )

virtual

Destructor.

The destructor unlocks the palette defined for the projected points (if any).

Member Function Documentation

§ canBeProjectedIfOutOfBounds()

virtual IlBoolean IlvPolylineChartDisplayer::canBeProjectedIfOutOfBounds ( ) const

virtual

Indicates whether the graphical representation can be projected when it is out-of-bounds.

Returns: a value indicating whether the graphical representation displayed by the current displayer can be projected on the limits of the data display area if the graphical representation goes outside of this area. The default implementation returns IlTrue.

Note: The parts of the polyline extending outside of the data display area will be projected on the limits of this area depending on the values returned by the IlvChartGraphic::projectHorizontally() and IlvChartGraphic::projectVertically() methods of the chart that uses the current displayer. The following figure shows an example of this.

The screen points corresponding to data points to display are represented by black squares. In the drawing on the left, the parts of the polyline extending outside of the data display area are not projected. Only the parts of the polyline displayed in bold will appear on the screen since the drawing is clipped by the data display area. In the drawing on the right, the parts of the polyline extending outside of the data display area are projected. Points are added (those shown by white circles) in order to close the polyline that was truncated in the drawing on the left. The polyline then appears to be continuous with the projected parts following the limits of the data display area.

Reimplemented from IlvAbstractChartDisplayer.

§ computeItem()

virtual void IlvPolylineChartDisplayer::computeItem	(	const IlvChartDisplayerPoints *	dispPts,
		IlUInt	pointIndex,
		IlUInt &	usedPointsCount,
		IlvPoint *	points,
		const IlvTransformer *	t = `0`
	)		const

protectedvirtual

Computes the item that will be displayed for a given point in screen coordinates corresponding to a data point to display.

Computes the points defining the item that will be displayed for the point in screen coordinates stored at the index pointIndex in the dispPts object. This object stores the points in screen coordinates corresponding to the data points that have to be displayed by the current displayer. (See the IlvSingleChartDisplayer::computeItem() method for more details.)

The item that will be displayed for a given screen point corresponding to a data point is a segment joining the current screen point and the following screen point corresponding to a data point to display. This segment is defined by two points: the point at the index pointIndex in the dispPts object and the point at the index pointIndex +1.

The number of points defining the item, that is 2 or 0 (if the point at the index pointIndex is the last one in dispPts), is returned in usedPointsCount.

Note: This method is called inside the drawPoints() method to compute the item that will be displayed for each point in screen coordinates that corresponds to a data point to display.

Implements IlvSingleChartDisplayer.

§ drawItem()

virtual void IlvPolylineChartDisplayer::drawItem	(	const IlvChartDisplayerPoints *	,
		IlUInt	pointIndex,
		IlUInt	pointCount,
		IlvPoint *	points,
		IlvPalette *	itemPalette,
		IlvPort *	dst,
		const IlvTransformer *	t = `0`,
		const IlvRegion *	clip = `0`
	)		const

protectedvirtual

Draws the item for a given point in screen coordinates corresponding to a data point to display.

Draws the item for the point in screen coordinates that is stored at the index pointIndex in the dispPts object. This object stores the points in screen coordinates corresponding to the data points that have to be displayed by the current displayer. (See the IlvSingleChartDisplayer::drawItem() method for more details.)

This method draws the part of the polyline defined by the points stored in points. This part of polyline begins at the point at the index pointIndex corresponding to a data point to display. It is composed of all the consecutive segments of the polyline that must be displayed with the same color. The polyline will be drawn at one time only if no point information is defined and so the same color is used to display the whole polyline. (See the IlvPolylineChartDisplayer::drawPoints() method.) The part of polyline is drawn with the foreground color of the palette itemPalette.

Note: This method is called inside the drawPoints() method.

Implements IlvSingleChartDisplayer.

Reimplemented in IlvPolygonChartDisplayer.

§ drawLegendItem()

virtual void IlvPolylineChartDisplayer::drawLegendItem	(	IlvPort *	dst,
		const IlvRect &	legendArea,
		IlvPalette *	itemPal,
		const IlvRegion *	clip,
		IlAny	clientData = `0`
	)		const

virtual

Draws the graphic part of a legend item associated with the current displayer.

The drawing is performed in the port dst using the clipping region clip. It is bounded by the rectangle legendArea.

The current implementation of the method simply draws an horizontal line passing through the center of legendArea and bounded by this area.

Parameters

dst	The port used for the drawing.
legendArea	The area where the drawing is performed.
itemPal	The palette of the legend item associated with the current displayer.
clip	The optional clipping region.
clientData	The client data defined for the legend item associated with the current displayer.

Reimplemented from IlvSingleChartDisplayer.

Reimplemented in IlvPolygonChartDisplayer.

§ drawPoints()

virtual void IlvPolylineChartDisplayer::drawPoints	(	IlvChartDisplayerPoints *	dispPts,
		IlvPort *	dst,
		const IlvTransformer *	t = `0`,
		const IlvRegion *	clip = `0`
	)		const

protectedvirtual

Draws the graphical representation from points in screen coordinates corresponding to the data points to display.

(See the IlvSingleChartDisplayer::drawPoints method for more details.)

The IlvPolylineChartDisplayer::computeItem method is used for each point in screen coordinates that corresponds to a data point to display to compute the item that will be displayed for this screen point. The IlvPolylineChartDisplayer::computeItem method returns the current screen point and the following point stored in dispPts, thus allowing the definition of a segment of the polyline to display. To improve the drawing performance, the IlvPolylineChartDisplayer::drawItem method is not necessary called for each screen point, but only when the color used to display the current segment is different from the color previously used. The IlvPolylineChartDisplayer::drawItem method can then be used to draw several segments.

The IlvSingleChartDisplayer::drawPointInfos method is used to draw the point information (if any).

Reimplemented from IlvSingleChartDisplayer.

Reimplemented in IlvPolygonChartDisplayer.

§ getItemPointsCount()

virtual IlUInt IlvPolylineChartDisplayer::getItemPointsCount ( const IlvChartDisplayerPoints * dispPts ) const

protectedvirtual

Returns the maximum number of points needed to define an item for the current displayer.

Parameters

dispPts The object that stores the points in screen coordinates to be displayed by the current displayer.

Returns: The number of points stored in dispPts, since the segments that make up the polyline are displayed at only one time if no point information is defined and so the same color is used to display the whole polyline. (See the IlvPolylineChartDisplayer::drawPoints method.)

Reimplemented from IlvSingleChartDisplayer.

§ getProjectedPointsPalette()

virtual IlvPalette* IlvPolylineChartDisplayer::getProjectedPointsPalette ( ) const

virtual

Returns the palette used to display out-of-bounds values.

The current implementation of the method returns a pointer to the palette object that has been set to display out-of-bounds data points for the current displayer, if such a palette has been set. Otherwise, it returns a pointer to the palette object that has been set to display out-of-bounds data points in the chart object that uses the current displayer.

Returns: A pointer to the palette object used to display out-of-bounds data points.

Reimplemented from IlvAbstractChartDisplayer.

§ graphicalRepresentationByDataPoint()

virtual IlBoolean IlvPolylineChartDisplayer::graphicalRepresentationByDataPoint ( ) const

virtual

Indicates whether there is a graphical representation by data point.

Returns a Boolean indicating whether there is a graphical representation by data point.

Returns: IlFalse by default. There is not a graphical representation by data point since the polyline that is displayed links several data points together.

Reimplemented from IlvAbstractChartDisplayer.

§ isContinuous()

virtual IlBoolean IlvPolylineChartDisplayer::isContinuous ( ) const

virtual

Indicates whether the graphical representation is continuous.

The graphical representation of data displayed by a displayer is said continuous if the graphical representation displayed for a given data point extends to and relies on another data point. So it is continuous if a given data point is not sufficient to display the graphical representation for this data point.

Returns: IlTrue by default, since the graphical representation displayed by the current displayer is a polyline that links the data points.

Reimplemented from IlvAbstractChartDisplayer.

§ selectDataPointsForPoint()

virtual IlvDoublePoint* IlvPolylineChartDisplayer::selectDataPointsForPoint	(	IlUInt	dataPointIndex,
		IlUInt &	count,
		IlUInt *&	dataPointIndexes
	)		const

protectedvirtual

Selects and returns the data points needed to display the graphical representation of the data points at a given index in the real data set(s) to be displayed by the current displayer.

(See the IlvSingleChartDisplayer::selectDataPointsForPoint method for more details.)

For a displayer displaying a data set with a polyline, the data points that are selected to be able to draw the graphical representation for a data point at a given index of the data set are the following: the data point at the index dataPointIndex plus the data point at the index before (if it exists), and the data point at the index after (if it exists). These selected data points allow the part of the polyline passing through the considered data point at the given index to be drawn.

Reimplemented from IlvSingleChartDisplayer.

Reimplemented in IlvPolygonChartDisplayer.

§ setProjectedPointsPalette()

void IlvPolylineChartDisplayer::setProjectedPointsPalette ( IlvPalette * palette )

Sets the palette used to display out-of-bounds values.

The previous palette is unlocked, and the new one is locked.

Parameters

palette A pointer to the new palette object that will be used to display out-of-bounds data points.

§ treatPointsOutOfAbscissaLimits()

virtual void IlvPolylineChartDisplayer::treatPointsOutOfAbscissaLimits	(	const IlvRect &	dataDisplayArea,
		IlvChartDisplayerPoints *	dispPts,
		const IlvCoordInterval &	abscissaRange,
		const IlvPoint &	minLimit,
		const IlvPoint &	maxLimit
	)		const

virtual

Treats the occurrence of the points in screen coordinates that are outside the abscissa limits.

(See the IlvAbstractChartDisplayer::treatPointsOutOfAbscissaLimits method for more details.)

This method computes the intersections with the abscissa limits of the parts of the polyline extending outside of these limits. The computed intersection points are added to the screen points stored in dispPts and the screen points that are outside the abscissa limits are removed from dispPts.

Reimplemented from IlvSingleChartDisplayer.

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

§ IlvPolylineChartDisplayer()

§ ~IlvPolylineChartDisplayer()

Member Function Documentation

§ canBeProjectedIfOutOfBounds()

§ computeItem()

§ drawItem()

§ drawLegendItem()

§ drawPoints()

§ getItemPointsCount()

§ getProjectedPointsPalette()

§ graphicalRepresentationByDataPoint()

§ isContinuous()

§ selectDataPointsForPoint()

§ setProjectedPointsPalette()

§ treatPointsOutOfAbscissaLimits()