IlvChartGradientPointInfo Class Reference

Sets the data point colors according to a gradient. More...

#include <ilviews/charts/data.h>

Inheritance diagram for IlvChartGradientPointInfo:

Public Member Functions
	IlvChartGradientPointInfo (IlDouble *values, const IlArray &colors)
	Constructor. More...
	IlvChartGradientPointInfo (const IlvChartGradientPointInfo &pointInfo)
	Copy of the Constructor. More...
	IlvChartGradientPointInfo (IlvInputFile &file)
	Constructor. More...
virtual	~IlvChartGradientPointInfo ()
	Destructor.
virtual IlBoolean	getPalette (const IlvChartDataSet *dataSet, IlUInt idx, const IlvAbstractChartDisplayer *disp, const IlvPalette *defaultPalette, IlvPalette *returnPalette) const
	Gets the specific palette for a point in the same collection. More...
Public Member Functions inherited from IlvChartDataPointInfo
	IlvChartDataPointInfo (IlvPalette *palette=0)
	Constructor. More...
	IlvChartDataPointInfo (const IlvChartDataPointInfo &pointInfo)
	Copy Constructor. More...
	IlvChartDataPointInfo (IlvInputFile &file)
	Constructor. More...
virtual	~IlvChartDataPointInfo ()
	Destructor. More...
virtual IlBoolean	boundingBox (const IlvPoint &point, const IlvChartDataSet *dataSet, IlUInt ptidx, const IlvChartGraphic *chart, IlvRect &bbox, const IlvTransformer *t=0) const
	Returns the bounding box of the graphical information object drawn next to the representation of the data point. More...
virtual IlvChartDataPointInfo *	copy () const
	Virtual copy constructor. More...
virtual void	draw (const IlvPoint &point, const IlvChartDataSet *dataSet, IlUInt ptidx, const IlvChartGraphic *chart, IlvPort *dst, const IlvTransformer *t=0, const IlvRegion *clip=0) const
	Draws a graphical information object next to the representation of the data point. More...
IlvPalette *	getPalette () const
	Returns the specific palette. More...
void	lock ()
	Locks the current IlvChartDataPointInfo object. More...
IlvOutputFile &	save (IlvOutputFile &file) const
	Writes a complete description of the current object in a file. More...
void	setForeground (IlvColor *color)
	Sets the foreground color for the specific palette. More...
virtual void	setMode (IlvDrawMode mode)
	Sets the drawing mode. More...
virtual void	setOverwrite (IlBoolean o)
	Sets the way the drawing member functions operate. More...
void	setPalette (IlvPalette *pal)
	Sets the specific palette. More...
void	unLock ()
	Unlocks the current IlvChartDataPointInfo object. More...
virtual void	write (IlvOutputFile &file) const
	Writes the attributes of the current object in a file. More...

Additional Inherited Members
Static Public Member Functions inherited from IlvChartDataPointInfo
static IlvChartDataPointInfo *	Load (IlvInputFile &file)
	Reads a point information object from a file. More...
static IlvChartDataPointInfo *	Read (IlvInputFile &file)
	Reads the attributes of a point information object from a file. More...

Detailed Description

Sets the data point colors according to a gradient.

Library: ilvcharts

A Point Info that computes the color of a data point according to a gradient specification.

The y-value of a data point is used to determine its color according to the transition values of the gradient.

Warning

[note] Limitation: this class does not work correctly on 8-bit displays. If you really need to use a gradient point info in 8-bit color mode, you must create a subclass of IlvChartGradientPointInfo as follows:

• allocate a known number of colors in the constructor.
• lock all allocated colors in the constructor.
• unlock all allocated colors in the destructor.
• redefine the getPalette() method to return a palette using the appropriate color from the allocated color set.

Constructor & Destructor Documentation

IlvChartGradientPointInfo::IlvChartGradientPointInfo	(	IlDouble *	values,
		const IlArray &	colors
	)

Constructor.

Initializes a new IlvChartGradientPointInfo object.

Parameters

values	The transition values of the gradient. The provided array must be sorted in ascending order.
colors	The colors associated with the transition values.

There must be as many values as colors.

IlvChartGradientPointInfo::IlvChartGradientPointInfo

(

const IlvChartGradientPointInfo &

pointInfo

)

Copy of the Constructor.

Initializes a new IlvChartGradientPointInfo object which is a copy of pointInfo.

Parameters

pointInfo

The point information that is used to initialize the current one.

IlvChartGradientPointInfo::IlvChartGradientPointInfo

(

IlvInputFile &

file

)

Constructor.

Initializes a new IlvChartGradientPointInfo object from the description read in the input file named file.

Parameters

file	The file used to initialize the current data point information.

Member Function Documentation

virtual IlBoolean IlvChartGradientPointInfo::getPalette ( const IlvChartDataSet *  dataSet, IlUInt  idx, const IlvAbstractChartDisplayer *  disp, const IlvPalette *  defaultPalette, IlvPalette *  returnPalette  ) const

virtual

Gets the specific palette for a point in the same collection.

Parameters

dataSet	The data set to which the point belongs.
idx	The index of the point.
disp	The displayer which displays the data set.
defaultPalette	The default palette.
returnPalette	A pointer to the specific palette that is changed according to how the data point is drawn.

Returns

true if the returnPalette is changed.

Reimplemented from IlvChartDataPointInfo.