Class for high-low displayers. More...

#include <ilviews/charts/hilo.h>

Inheritance diagram for IlvHiLoChartDisplayer:

Public Member Functions
	IlvHiLoChartDisplayer (IlvDim width=IlvChartDisplayerWidth, IlvPalette risePalette=0, IlvPalette fallPalette=0)
	Constructor. More...

virtual	~IlvHiLoChartDisplayer ()
	Destructor. More...

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

IlvPalette *	getFallPalette () const
	Returns the fall palette. 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 IlvChartDataPointInfo *	getPointInfo (IlUInt dataPointIndex, const IlvChartDataSet *dataSet=0) const
	Returns the point information associated with a given data point. More...

IlvPalette *	getRisePalette () const
	Returns the rise palette. More...

IlvDim	getSize () const
	Returns the size of the high-low items. More...

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

IlvDim	getWidth () const
	Returns the width of the high-low items. More...

IlUInt	getWidthPercent () const
	Returns the width percentage of the high-low items. More...

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

void	setFallPalette (IlvPalette *pal)
	Sets the fall palette. More...

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

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

void	setRisePalette (IlvPalette *pal)
	Sets the rise palette. More...

void	setWidth (IlvDim width)
	Sets the width of the high-low items. More...

void	setWidthPercent (IlUInt width)
	Sets the width percentage of the high-low items. More...

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

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 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...

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	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 void	treatPointsOutOfAbscissaLimits (const IlvRect &dataDisplayArea, IlvChartDisplayerPoints *displayerPoints, const IlvCoordInterval &abscissaRange, const IlvPoint &minLimit, const IlvPoint &maxLimit) const
	Treats the occurrence of points in screen coordinates that are outside the abscissa limits. 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 IlBoolean	canBeProjectedIfOutOfBounds () const
	Indicates whether the graphical representation can be projected when it is out-of-bounds. 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 IlvPalette *	getProjectedPointsPalette () const
	Returns the palette used to display out-of-bounds values. 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 IlBoolean	graphicalRepresentationByDataPoint () const
	Indicates whether there is a graphical representation by data point. More...

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

Protected Member Functions
virtual void	boundingBoxOfPoints (IlvChartDisplayerPoints displayerPoints, IlvRect &bbox, IlBoolean takeInfoIntoAccount, const IlvTransformer t=0) const
	Returns the bounding box of the graphical representation from points in screen coordinates corresponding to the data points to display. More...

virtual void	computeItem (const IlvChartDisplayerPoints displayerPoints, 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 displayerPoints, 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	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 void	drawPoints (IlvChartDisplayerPoints displayerPoints, 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 *displayerPoints) 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...

virtual void	updateVirtualDataSets ()
	Updates the virtual data set. 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 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.

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 high-low displayers.

Library: ilvcharts

This class is a subclass of IlvSingleChartDisplayer which allows you to represent data with high-low items composed of segments. A high-low item is made of a segment linking a low value and a high value and ending at both extremities with pins.

The high-low displayer displays two data sets. The first data set is composed of the low values and the second data set is composed of the high values.

A high-low item is drawn between each pair of low-high values, the low values being taken in order from the first data set and the high values being taken in order from the second data set. Two palettes are defined for this displayer: a rise palette and a fall palette. The rise palette is used to draw the high-low items for which the corresponding low value is smaller than the high value. The fall palette is used to draw the high-low items for which the corresponding low value is greater than the high value.

Since the high-low displayer needs to have a value from each data set that it displays to draw a high-low item, the displayer internally uses a specific virtual data set to put the data into a format that can be displayed. This virtual data set is an instance of the IlvHiLoChartDataSet class. (See this class for more details). It is composed of alternate items from the two data sets: the first data item of the first data set followed by the first data item of the second data set, then the second data item of the first data set followed by the second data item of the second data set, and so on. The virtual data set, constructed from the two real data sets that are set on the displayer, is the data set that is actually displayed by the displayer. (See the Detailed Description of the IlvAbstractChartDisplayer class for more details about virtual data sets).

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 a high-low displayer in a Cartesian chart (on the left) and a polar chart (on the right). The rise palette has its foreground color set to green and the fall palette to red.

See Also: IlvSingleChartDisplayer.

Constructor & Destructor Documentation

IlvHiLoChartDisplayer::IlvHiLoChartDisplayer	(	IlvDim	width = `IlvChartDisplayerWidth`,
		IlvPalette *	risePalette = `0`,
		IlvPalette *	fallPalette = `0`
	)

Constructor.

Initializes a new IlvHiLoChartDisplayer object.

Parameters

width	The width of the high-low items.
risePalette	The rise palette that will be used to draw the high-low items for which the corresponding low value is smaller than the high value.
fallPalette	The fall palette that will be used to draw the high-low items for which the corresponding low value is greater than the high value .

virtual IlvHiLoChartDisplayer::~IlvHiLoChartDisplayer ( )

virtual

Destructor.

The destructor unlocks all palettes used by the current displayer.

Member Function Documentation

virtual void IlvHiLoChartDisplayer::boundingBoxOfPoints	(	IlvChartDisplayerPoints *	displayerPoints,
		IlvRect &	bbox,
		IlBoolean	takeInfoIntoAccount,
		const IlvTransformer *	t = `0`
	)		const

protectedvirtual

Returns the bounding box of the graphical representation from points in screen coordinates corresponding to the data points to display.

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

This method calls the IlvSingleChartDisplayer::boundingBoxOfPoints method. Then, the computed bounding box is expanded along the base by the size of the high-low items. The term base of a chart refers to the abscissa scale of this chart.

Reimplemented from IlvSingleChartDisplayer.

virtual void IlvHiLoChartDisplayer::computeItem	(	const IlvChartDisplayerPoints *	displayerPoints,
		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 that is stored at the index pointIndex in the displayerPoints 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 data points that are displayed are those of the virtual data set that is constructed internally from the two data sets that are set on the current displayer. (See the Detailed Description for more details.) These data points are the alternate data points of the low-values and high-values data sets. Since two data points (one from the low-values data set and one from the high-values data set) are needed to draw a high-low item, the data points of the virtual data set are considered in pairs and the computeItem() method will be called once for each pair of screen points corresponding to data points to display instead of once for each screen point.

The item displayed for a given pair of screen points corresponding to a data point of the low-values data set and a data point to the high-values data set respectively is composed of a segment linking the pair of screen points with two pins perpendicular to the segment added at the extremities of the segment. Thus, the item is simply a polyline made of three segments defined by four points.

The number of computed points defining the item is returned in usedPointsCount.

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

Implements IlvSingleChartDisplayer.

Reimplemented in IlvHiLoBarChartDisplayer.

virtual void IlvHiLoChartDisplayer::drawItem	(	const IlvChartDisplayerPoints *	displayerPoints,
		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 displayerPoints 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 high-low item defined by the points stored in points. The item that is drawn is simply a polyline made of three segments. This polyline is displayed with the foreground color of the palette itemPalette. (See the IlvHiLoChartDisplayer::computeItem() method for more details.)

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

Implements IlvSingleChartDisplayer.

Reimplemented in IlvHiLoBarChartDisplayer.

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

protectedvirtual

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 a rectangle on the limits of legendArea with the foreground color of the palette defined for the current displayer and fills this rectangle with the background color of this palette.

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 IlvHiLoBarChartDisplayer.

virtual void IlvHiLoChartDisplayer::drawPoints	(	IlvChartDisplayerPoints *	displayerPoints,
		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 default implementation of this method uses the IlvHiLoChartDisplayer::getClipArea() method to obtain the clipping region to be used for the drawing. Then, for each pair of points in screen coordinates stored in displayerPoints, it uses:

the IlvHiLoChartDisplayer::computeItem() method to compute the item that will be displayed for this pair of screen points.
the IlvHiLoChartDisplayer::drawItem() method to draw the item for this pair of screen points.

At the end, it uses the IlvSingleChartDisplayer::drawPointInfos() method to draw the point information (if any).

Note: The data points that are displayed are those of the virtual data set that is constructed internally from the two data sets that are set on the current displayer. (See the Detailed Description for more details.) These data points are the alternate data points of the low-values and high-values data sets. Since two data points (one from the low-values data set and one from the high-values data set) are needed to draw a high-low item, the data points of the virtual data set are considered in pairs. And thus the computeItem() and drawItem() methods are called only once for each pair of screen points corresponding to data points to display.

Reimplemented from IlvSingleChartDisplayer.

virtual void IlvHiLoChartDisplayer::getClipArea	(	IlvRect &	area,
		const IlvTransformer *	t
	)		const

virtual

Returns the clipping region that is used for the drawing.

The current implementation of the method returns in area the area obtained by the IlvSingleChartDisplayer::getClipArea method expanded along the base by the size of the high-low items. (The size is obtained by the IlvHiLoChartDisplayer::getSize method.) The term base of a chart refers to the abscissa scale of this chart.

Parameters

area	The clipping region that is used to clip the graphical representation of data drawn by the current displayer.
t	The transformer that is applied to the returned clipping region.

Reimplemented from IlvSingleChartDisplayer.

IlvPalette* IlvHiLoChartDisplayer::getFallPalette ( ) const

Returns the fall palette.

Returns: A pointer to the palette that is used to draw the high-low items for which the corresponding low value is greater than the high value.

virtual IlUInt IlvHiLoChartDisplayer::getItemPointsCount ( const IlvChartDisplayerPoints * displayerPoints ) const

protectedvirtual

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

(See the IlvHiLoChartDisplayer::computeItem method for more details.)

Parameters

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

Returns: 4.

Reimplemented from IlvSingleChartDisplayer.

Reimplemented in IlvHiLoBarChartDisplayer.

virtual const char* IlvHiLoChartDisplayer::getLegendText ( IlUInt index = 0 ) const

virtual

Returns the text that will be used in a legend for the current displayer.

This method returns the legend text stored inside the current displayer if it is defined. Otherwise, it returns the names of the data sets storing the low and high values that are displayed by the current displayer. The names of the data sets are separated by the character "|".

See the IlvAbstractChartDisplayer::getLegendText method for more details.

Parameters

index This parameter is meaningless and can be omitted since the current displayer is not a composite displayer. In the case of a composite displayer, this parameter indicates the index of the displayer within the displayers that compose the composite displayer.

Returns: The text that will be used in a legend.

Reimplemented from IlvSingleChartDisplayer.

virtual IlvChartDataPointInfo* IlvHiLoChartDisplayer::getPointInfo	(	IlUInt	dataPointIndex,
		const IlvChartDataSet *	dataSet = `0`
	)		const

virtual

Returns the point information associated with a given data point.

Returns the point information associated with the data point at the index index in the data set dataSet if dataSet is different from 0. dataSet must be a real data set displayed by the current displayer. If dataSet is equal to 0, the point information associated with a given data point is searched for in the alternate data points of the low-values and high-values data sets that make up the virtual data set used by the current displayer. The point information that is returned is then the point information for the data item at the index dataPointIndex /2 in the data set getRealDataSet(dataPointIndex % 2).

See the IlvAbstractChartDisplayer::getPointInfo method for more details.

Parameters

dataPointIndex	The index of the data point for which we want to retrieve the point information.
dataSet	The data set to which the data point belongs.

Returns: A pointer to the point information associated with a given data point.

Reimplemented from IlvAbstractChartDisplayer.

IlvPalette* IlvHiLoChartDisplayer::getRisePalette ( ) const

Returns the rise palette.

Returns: A pointer to the palette that is used to draw the high-low items for which the corresponding low value is smaller than the high value.

IlvDim IlvHiLoChartDisplayer::getSize ( ) const

Returns the size of the high-low items.

Returns: The size of the high-low items.

Note: This size corresponds to half the width of a high-low item.

virtual IlvDim IlvHiLoChartDisplayer::getSizeAlongBase ( ) const

virtual

Returns the size along the base for the graphical representation of a given data point.

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

Returns: The width of a high-low item.

Note: This size corresponds to twice the value returned by the IlvHiLoChartDisplayer::getSize() method.

Reimplemented from IlvSingleChartDisplayer.

IlvDim IlvHiLoChartDisplayer::getWidth ( ) const

Returns the width of the high-low items.

Returns: The width of the high-low items.

IlUInt IlvHiLoChartDisplayer::getWidthPercent ( ) const

Returns the width percentage of the high-low items.

Returns: The width percentage of the high-low items.

virtual IlBoolean IlvHiLoChartDisplayer::isContinuous ( ) const

virtual

Indicates whether the graphical representation is continuous.

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

Returns: IlTrue by default since the graphical representation displayed by the current displayer is made up of high-low items that link pairs of data points with segments.

Reimplemented from IlvAbstractChartDisplayer.

virtual IlBoolean IlvHiLoChartDisplayer::isFilled ( ) const

virtual

Indicates whether the graphical representation is filled.

A graphical representation is filled for a given data point if it is not only located around this data point but also if it extends towards the origin. This is the case for displayers representing data with high-low items, since a high-low item extends along the ordinate between a low and a high value. (See the IlvAbstractChartDisplayer::isFilled method for more details).

Returns: IlTrue by default.

Reimplemented from IlvAbstractChartDisplayer.

virtual IlBoolean IlvHiLoChartDisplayer::isViewable ( ) const

virtual

Indicates whether the graphical representation can be viewed.

The graphical representation displayed by the current displayer can be viewed if and only if all the elements required to be able to display this graphical representation are verified. It can be viewed if the graphical representation is visible, if the number of data sets to display is greater than or equal to 2, and if the coordinate information associated with the ordinate scale considered to display the data is defined.

Returns: IlTrue if the graphical representation displayed by the current displayer can be viewed and IlFalse otherwise.

Reimplemented from IlvAbstractChartDisplayer.

virtual IlvDoublePoint* IlvHiLoChartDisplayer::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.)

The data points are selected in the virtual data set that is constructed internally from the two data sets that are set on the current displayer, since the data points of this virtual data set are the data points that are finally displayed. (See the Detailed Description for more details).

For a high-low displayer, the data points that are selected to be able to draw the high-low item for the data points at the dataPointIndex index in the low-values and high-values data sets are: the data points at the index dataPointIndex *2 and at the index dataPointIndex *2+1 in the virtual data set. These two data points correspond to the data points at the index dataPointIndex in the data set storing the low values and in the data set storing the high values.

Reimplemented from IlvSingleChartDisplayer.

void IlvHiLoChartDisplayer::setFallPalette ( IlvPalette * pal )

Sets the fall palette.

The old palette, if one exists, is unlocked and the new palette is locked.

Parameters

pal	The new fall palette that is used to draw the high-low items for which the corresponding low value is greater than the high value.

virtual void IlvHiLoChartDisplayer::setMode ( IlvDrawMode mode )

virtual

Sets the drawing mode.

Sets the drawing mode for the current object. The information is passed to all the palettes used by the current displayer to display data.

Parameters

mode	The new drawing mode for the current object.

Reimplemented from IlvSingleChartDisplayer.

virtual void IlvHiLoChartDisplayer::setOverwrite ( IlBoolean o )

virtual

Sets the overwrite mode.

Modifies the way the drawing member functions of the current object operate when drawing on the root port. If the o parameter is set to IlFalse, the drawing operations are hidden by the windows stored on the top window. If the parameter is set to IlTrue, the drawing operations are performed on top of every window present on the screen, just as if the windows were part of the root window. The information is passed to all the palettes used by the current displayer to display data.

Parameters

o	The new value of the Boolean indicating the way the drawing member functions operate.

Reimplemented from IlvSingleChartDisplayer.

void IlvHiLoChartDisplayer::setRisePalette ( IlvPalette * pal )

Sets the rise palette.

The old palette, if one exists, is unlocked and the new palette is locked.

Parameters

pal	The new rise palette that is used to draw the high-low items for which the corresponding low value is smaller than the high value.

void IlvHiLoChartDisplayer::setWidth ( IlvDim width )

Sets the width of the high-low items.

Parameters

width The new width of the high-low items.

void IlvHiLoChartDisplayer::setWidthPercent ( IlUInt width )

Sets the width percentage of the high-low items.

The width of the high-low items will be computed as a percentage of the available space between two abscissa points. Therefore, the items width will grow along if the chart is enlarged or if the visible range is reduced.

Parameters

width The width percentage, between 0 and 100 .

virtual void IlvHiLoChartDisplayer::updateVirtualDataSets ( )

protectedvirtual

Updates the virtual data set.

This method first removes the existing virtual data set and then constructs the new virtual data set of the IlvHiLoChartDataSet type used by the current displayer. This virtual data set is composed of the two data sets (the data set storing the low values and the data set storing the high values) that have to be displayed by the current displayer.

Note: This method is used internally and should not be used directly by the user. It is called in the IlvAbstractChartDisplayer::update() method to update the virtual data sets when the real data sets have been modified.

Reimplemented from IlvAbstractChartDisplayer.

virtual IlBoolean IlvHiLoChartDisplayer::useVirtualDataSets ( ) const

virtual

Indicates whether the current displayer uses virtual data sets.

Returns: IlTrue since the current displayer uses an intermediate data set to be able to display the low and high values stored in two data sets with high-low items. (See the Detailed Description for more information.)

Reimplemented from IlvAbstractChartDisplayer.

Rogue Wave ViewsCharts Package API Reference Guide

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Rogue Wave Views
Charts Package API Reference Guide