IlvRadialChartCursor Class Reference

Cursor subclass for the abscissa scale of polar charts. More...

#include <ilviews/charts/cursor.h>

Inheritance diagram for IlvRadialChartCursor:

List of all members.

Public Member Functions
	IlvRadialChartCursor (IlDouble value, IlvPalette *palette=0)
	Constructor.
virtual void	delimiterBBox (const IlvSingleScaleDisplayer *scale, const IlvPoint &cursorPoint, IlDouble cursorAngle, const IlvRect &scaleDataDisplayArea, IlvRect &bbox) const
	Returns the bounding box of the delimiter.
virtual void	drawDelimiter (const IlvSingleScaleDisplayer *scale, const IlvPoint &cursorPoint, IlDouble cursorAngle, const IlvRect &scaleDataDisplayArea, IlvPort *dst, const IlvRegion *clip) const
	Draws the cursor delimiter.

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Detailed Description

Cursor subclass for the abscissa scale of polar charts.

Library: ilvcharts

This class is a subclass of IlvAbstractChartCursor that allows you to define a radial cursor. This kind of cursor is used only for polar charts. A polar chart displays data expressed in polar coordinates with an abscissa scale that is circular and ordinate scales that are radial. A radial cursor is designed to be added to the circular scale of a polar chart. It draws a line joining the center of the data display area to the point on the abscissa scale corresponding to the cursor value.

You can see an example of a radial cursor on the figure below where a cursor is added to the abscissa scale of the displayed chart.

See also:

IlvAbstractChartCursor.

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Constructor & Destructor Documentation

IlvRadialChartCursor::IlvRadialChartCursor	(	IlDouble	value,
		IlvPalette *	palette = 0
	)

Constructor.

Initializes a new IlvRadialChartCursor object.

Parameters:

	value	The cursor value.
	palette	The palette used to draw the cursor.

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Member Function Documentation

virtual void IlvRadialChartCursor::delimiterBBox	(	const IlvSingleScaleDisplayer *	scale,
		const IlvPoint &	cursorPoint,
		IlDouble	cursorAngle,
		const IlvRect &	scaleDataDisplayArea,
		IlvRect &	bbox
	)			const [virtual]

Returns the bounding box of the delimiter.

This method must be defined in subclasses.

Parameters:

	scale	The scale to which the cursor is attached.
	cursorpoint	The point in view coordinates on the scale axis.
	cursorAngle	The direction angle of the cursor from the scale axis.
	scaleDataDisplayArea	The data display area of the corresponding scale.
	bbox	The returned bounding box.

Implements IlvAbstractChartCursor.

virtual void IlvRadialChartCursor::drawDelimiter	(	const IlvSingleScaleDisplayer *	scale,
		const IlvPoint &	cursorPoint,
		IlDouble	cursorAngle,
		const IlvRect &	scaleDataDisplayArea,
		IlvPort *	dst,
		const IlvRegion *	clip
	)			const [virtual]

Draws the cursor delimiter.

This method must be defined in subclasses. The defined method should take into account the ghost drawing property of the delimiter (see the IlvAbstractChartCursor::isDrawingGhost method).

Parameters:

	scale	The scale to which the cursor is attached.
	cursorpoint	The point in view coordinates on the scale axis.
	cursorAngle	The direction angle of the cursor from the scale axis.
	scaleDataDisplayArea	The data display area of the corresponding scale.
	dst	The drawing port.
	clip	The drawing clip.

Implements IlvAbstractChartCursor.