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Charts Package API Reference Guide

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IlvHiLoChartDisplayer Class Reference

Class for high-low displayers. More...

#include <ilviews/charts/hilo.h>

Inheritance diagram for IlvHiLoChartDisplayer:
IlvSingleChartDisplayer IlvAbstractChartDisplayer IlvHiLoBarChartDisplayer

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...
 
IlvPalettegetFallPalette () 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 IlvChartDataPointInfogetPointInfo (IlUInt dataPointIndex, const IlvChartDataSet *dataSet=0) const
 Returns the point information associated with a given data point. More...
 
IlvPalettegetRisePalette () 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 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...
 
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 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...
 
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 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 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 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 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...
 
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...
 

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 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...
 
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 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.
 

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 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
widthThe width of the high-low items.
risePaletteThe rise palette that will be used to draw the high-low items for which the corresponding low value is smaller than the high value.
fallPaletteThe 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
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 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:

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
areaThe clipping region that is used to clip the graphical representation of data drawn by the current displayer.
tThe 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
displayerPointsThe 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
indexThis 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
dataPointIndexThe index of the data point for which we want to retrieve the point information.
dataSetThe 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
palThe 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
modeThe 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
oThe 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
palThe 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
widthThe 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
widthThe 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.


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