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IlvPolylineChartDisplayer Class Reference

Class for polyline displayers. More...

#include <ilviews/charts/polyline.h>

Inheritance diagram for IlvPolylineChartDisplayer:
IlvSingleChartDisplayer IlvAbstractChartDisplayer IlvValueInterface IlvPolygonChartDisplayer

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 IlvPalettegetProjectedPointsPalette () 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 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 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...
 
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 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...
 
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 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 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(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 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 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 ( IlvPalette palette = 0)

Constructor.

Initializes a new IlvPolylineChartDisplayer object.

Parameters
paletteThe palette that will be used to display the polyline.
virtual IlvPolylineChartDisplayer::~IlvPolylineChartDisplayer ( )
virtual

Destructor.

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

Member Function Documentation

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.

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.

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.

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
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 IlvSingleChartDisplayer.

Reimplemented in IlvPolygonChartDisplayer.

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.

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
dispPtsThe 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.

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.

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.

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.

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.

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


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