Class for polygon displayers. More...

#include <ilviews/charts/polyline.h>

Inheritance diagram for IlvPolygonChartDisplayer:

Public Member Functions
	IlvPolygonChartDisplayer (IlvPalette *palette=0)
	Constructor. 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 IlBoolean	isFilled () const
	Indicates whether the graphical representation is filled. More...

Public Member Functions inherited from IlvPolylineChartDisplayer
	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 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	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	boundingBoxOfPoints (IlvChartDisplayerPoints dispPts, IlvRect &bbox, IlBoolean takeInfoIntoAccount=IlTrue, 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	drawItem (const IlvChartDisplayerPoints dispPts, 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 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 IlvPolylineChartDisplayer
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 IlUInt	getItemPointsCount (const IlvChartDisplayerPoints *dispPts) const
	Returns the maximum number of points needed to define an item for 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 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 polygon displayers.

Library: ilvcharts

This class is a subclass of IlvPolylineChartDisplayer which allows you to represent data with a polygon.

The polygon 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 polygon displayers in a Cartesian chart (on the left) and a polar chart (on the right).

See also: IlvPolylineChartDisplayer.

Constructor & Destructor Documentation

§ IlvPolygonChartDisplayer()

IlvPolygonChartDisplayer::IlvPolygonChartDisplayer ( IlvPalette * palette = 0 )

Constructor.

Initializes a new IlvPolygonChartDisplayer object.

Parameters

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

Member Function Documentation

§ boundingBoxOfPoints()

virtual void IlvPolygonChartDisplayer::boundingBoxOfPoints	(	IlvChartDisplayerPoints *	dispPts,
		IlvRect &	bbox,
		IlBoolean	takeInfoIntoAccount = `IlTrue`,
		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 first computes the two points that are added to the points in screen coordinates that correspond to the data points to display in order to close the polygon. (See the IlvPolygonChartDisplayer::drawPoints method for more details about this calculation.) These two points are added to the points stored in dispPts. The method then calls the IlvSingleChartDisplayer::boundingBoxOfPoints method with the dispPts object that has been modified as a parameter.

Reimplemented from IlvSingleChartDisplayer.

§ drawItem()

virtual void IlvPolygonChartDisplayer::drawItem	(	const IlvChartDisplayerPoints *	dispPts,
		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 is used only one time (and not for each screen point) to draw the whole polygon. The points defining the extremities of the polygon are stored in points. A polyline is drawn between the extremities of the polygon with the foreground color of the palette itemPalette. The polygon is filled with the background color of the palette itemPalette if the method IlvSingleChartDisplayer::isDrawingFill() returns IlTrue.

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

Reimplemented from IlvPolylineChartDisplayer.

§ drawLegendItem()

virtual void IlvPolygonChartDisplayer::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 current method simply calls the IlvSingleChartDisplayer::drawLegendItem method. (See the IlvSingleChartDisplayer::drawLegendItem method for more details.)

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 IlvPolylineChartDisplayer.

§ drawPoints()

virtual void IlvPolygonChartDisplayer::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.)

This method first computes the two points that are added to the points in screen coordinates that correspond to the data points to display in order to close the polygon. These two points are computed from the first and the last points stored in dispPts. They are located on the abscissa scale in Cartesian charts. They are both on the center of the data display area in polar charts. (These points correspond to the points marked with white circles in the preceding figure.) These two points are added to the points stored in dispPts.

The method computeItem is used for each point in screen coordinates that is stored in dispPts to compute the item that will be displayed for the screen point. The method computeItem returns the current screen point and the following point stored in dispPts, thus allowing the definition of a segment bounding the polygon to display. To improve the drawing performance, the IlvPolygonChartDisplayer::drawItem is called only one time (and not for each screen point) to draw the whole polygon.

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

Reimplemented from IlvPolylineChartDisplayer.

§ isFilled()

virtual IlBoolean IlvPolygonChartDisplayer::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 a polygon. The polygon is bounded by the data point positions and is drawn to the abscissa scale in Cartesian charts and to the center of the data display area in polar charts. The following figure shows an example. The screen points corresponding to data points to display are represented by black squares.

Returns: IlTrue by default.

Reimplemented from IlvAbstractChartDisplayer.

§ selectDataPointsForPoint()

virtual IlvDoublePoint* IlvPolygonChartDisplayer::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 IlvPolylineChartDisplayer.

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

§ IlvPolygonChartDisplayer()

Member Function Documentation

§ boundingBoxOfPoints()

§ drawItem()

§ drawLegendItem()

§ drawPoints()

§ isFilled()

§ selectDataPointsForPoint()