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IlvStairChartDisplayer Class Reference

Class for stair displayers. More...

#include <ilviews/charts/polyline.h>

Inheritance diagram for IlvStairChartDisplayer:
IlvStepChartDisplayer IlvSingleChartDisplayer IlvAbstractChartDisplayer IlvValueInterface

Public Member Functions

 IlvStairChartDisplayer (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 IlvStepChartDisplayer
 IlvStepChartDisplayer (IlvPalette *palette=0)
 Constructor. 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...
 
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 IlvChartDisplayerPointsallocDisplayerPoints () 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 IlvColorgetBackground (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...
 
IlvChartDisplayerPointsFactorygetDisplayerPointsFactory () 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 IlvColorgetForeground (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 IlvPalettegetPalette (IlUInt=0) const
 Returns a palette used by the current displayer to display data. More...
 
virtual IlvPointInfoCollectiongetPointInfoCollection (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...
 
IlvChartDisplayerPointsFactorysetDisplayerPointsFactory (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 IlBoolean canBeProjectedIfOutOfBounds () const
 Indicates whether the graphical representation can be projected when it is out-of-bounds. More...
 
virtual IlvAbstractChartDisplayercopy () 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...
 
IlvChartGraphicgetChartGraphic () const
 Returns the chart graphic which uses the current displayer. More...
 
IlvChartDataSetgetDataSet (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...
 
IlvCoordinateInfogetOrdinateInfo () const
 Deprecated Returns the coordinate information associated with the ordinate scale considered to display data. More...
 
const IlvCompositeChartDisplayergetParentDisplayer () const
 Returns the parent displayer. More...
 
virtual IlvChartDataPointInfogetPointInfo (IlUInt dataPtIdx, const IlvChartDataSet *dataSet=0) const
 Returns the point information associated with a given data point. More...
 
virtual IlvPalettegetProjectedPointsPalette () const
 Returns the palette used to display out-of-bounds values. More...
 
IlvChartDataSetgetRealDataSet (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 IlvCombinedChartDataSetgetVirtualDataSet (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...
 
IlvOutputFilesave (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 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 *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 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 IlvStepChartDisplayer
virtual IlvDoublePointselectDataPointsForPoint (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 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 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 IlvDoublePointselectDataPointsForRange (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 IlvDoublePointselectDataPointsInRect (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 IlvAbstractChartDisplayerLoad (IlvInputFile &file)
 Reads a displayer object from a file. More...
 

Detailed Description

Class for stair displayers.

Library: ilvcharts

This class is a subclass of IlvStepChartDisplayer that allows you to represent data with stairs.

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

See also
IlvStepChartDisplayer.

Constructor & Destructor Documentation

§ IlvStairChartDisplayer()

IlvStairChartDisplayer::IlvStairChartDisplayer ( IlvPalette palette = 0)

Constructor.

Initializes a new IlvStairChartDisplayer object.

Parameters
paletteThe palette that will be used to display the stairs.

Member Function Documentation

§ boundingBoxOfPoints()

virtual void IlvStairChartDisplayer::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 stairs. (See the IlvStairChartDisplayer::drawPoints method for more details about this calculation.) These two points are added to the points stored in dispPts. The method then calls the IlvStairChartDisplayer::computeItem method for each screen point stored in dispPts to compute the item that will be displayed for this screen point. Finally, the returned bounding box corresponds to the bounding box of all the points defining the items computed for all the points stored in dispPts.

Reimplemented from IlvStepChartDisplayer.

§ computeItem()

virtual void IlvStairChartDisplayer::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 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::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 point obtained by being shifted along the abscissa scale from the current screen point toward the following point stored in dispPts. This segment is defined by using 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 is returned in usedPointsCount.

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

Reimplemented from IlvStepChartDisplayer.

§ drawItem()

virtual void IlvStairChartDisplayer::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 stairs. The points defining the stairs are stored in points. A polyline is drawn between these points with the foreground color of the palette itemPalette. The stairs are 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 IlvStepChartDisplayer.

§ drawLegendItem()

virtual void IlvStairChartDisplayer::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
dstThe port used for the drawing.
legendAreaThe area where the drawing is performed.
itemPalThe palette of the legend item associated with the current displayer.
clipThe optional clipping region.
clientDataThe client data defined for the legend item associated with the current displayer.

Reimplemented from IlvStepChartDisplayer.

§ drawPoints()

virtual void IlvStairChartDisplayer::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 stairs. 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. Both points are on the center of the data display area in polar charts. Look at the preceding figure for an example. On this figure, the screen points corresponding to data points to display are marked by black squares. These points are stored in dispPts. The two points that are added to close the stairs are shown with white circles. Once they have been computed, these two points are added to the points stored in dispPts.

The method IlvStairChartDisplayer::computeItem is used for each point in screen coordinates that is in dispPts to compute the item that will be displayed for this screen point. The method IlvStairChartDisplayer::computeItem returns the current screen point and the point obtained by being shifted along the abscissa scale from the current screen point toward the next point stored in dispPts. These two points allow the definition of a segment bounding the stairs to display that is issued from the current screen point. (See the previous figure where such a segment is shown for the point 1 in bold.) To improve the drawing performance, the method drawItem is called only one time (and not for each screen point) to draw the complete set of segments bounding the stairs.

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

Reimplemented from IlvSingleChartDisplayer.

§ getItemPointsCount()

virtual IlUInt IlvStairChartDisplayer::getItemPointsCount ( const IlvChartDisplayerPoints dispPts) const
protectedvirtual

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

Parameters
dispPtsThe object that stores the points in screen coordinates to be displayed by the current displayer.
Returns
(N - 2) * 2, where N is the number of points stored in dispPts.
Note
The returned number corresponds to the total number of points used to display the stairs, since the segments that make up the stairs are displayed at only one time. These points are computed by calling the IlvStairChartDisplayer::computeItem() method for each screen point stored in dispPts. (See the IlvStairChartDisplayer::computeItem() method for more information.) The following figure shows a simple example illustrating the points used to display the stairs.

The screen points corresponding to data points to display are marked with black squares. The two points added to close the stairs are marked with white circles. All these points (black squares and white circles) are stored in the dispPts object that is considered for the drawing. The points defining the stairs that are computed from the points stored in dispPts are surrounded by white squares. The number of points defining the stairs is equal to (N - 2) * 2, where >N is the number of points stored in dispPts.

Reimplemented from IlvStepChartDisplayer.

§ isFilled()

virtual IlBoolean IlvStairChartDisplayer::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 stairs. The stairs are bounded by the steps computed for the data points (see the IlvStepChartDisplayer class) and are 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 marked by black squares.

Returns
IlTrue by default.

Reimplemented from IlvAbstractChartDisplayer.


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