IlvLinkImage Class Reference

Base class for grapher links. More...

#include <ilviews/grapher/links.h>

Inheritance diagram for IlvLinkImage:

Public Member Functions
	IlvLinkImage (IlvDisplay *display, IlBoolean oriented, IlvGraphic *from, IlvGraphic *to, IlvPalette *palette=0)
	Constructor. More...
virtual void	computePoints (IlvPoint &src, IlvPoint &dst, const IlvTransformer *t=0) const
	Computes the endpoints of the link when it is drawn as a straight line. More...
IlvGraphic *	getFrom () const
	Returns the start node. More...
virtual IlvPoint *	getLinkPoints (IlUInt &nPoints, const IlvTransformer *t=0) const
	Returns the points defining the shape of the link. More...
IlvGraphic *	getTo () const
	Returns the end node. More...
IlBoolean	isOriented () const
	Indicates whether the link is oriented. More...
void	setFrom (IlvGraphic *f)
	Sets the start node. More...
void	setOriented (IlBoolean oriented)
	Changes the oriented mode. More...
void	setTo (IlvGraphic *t)
	Sets the end node. More...
virtual IlBoolean	zoomable () const
	Returns the zoomable property of the link. More...

Detailed Description

Base class for grapher links.

Library: ilvgrapher

IlvLinkImage is the base class for graphic objects that represent a connection between two nodes. By default, link instances appear as a straight line between the two nodes, as shown by the following figure:

- IlvLinkImage -

See Also

IlvGrapher, IlvGrapherPin, IlvMakeLinkInteractor.

Constructor & Destructor Documentation

IlvLinkImage::IlvLinkImage	(	IlvDisplay *	display,
		IlBoolean	oriented,
		IlvGraphic *	from,
		IlvGraphic *	to,
		IlvPalette *	palette = 0
	)

Constructor.

Initializes a new instance of IlvLinkImage that draws a straight line (with or without an arrowhead) between the start and end nodes of the link. When oriented has a value of IlTrue, the link appears as in the following figure:

Parameters

display	The display connection that handles the drawing of this object.
oriented	A Boolean indicating whether an arrowhead is to be drawn at the end of the link.
from	The IlvGraphic object representing the start node of the link.
to	The IlvGraphic object representing the end node of the link.
palette	The palette used to draw the link.

Member Function Documentation

virtual void IlvLinkImage::computePoints ( IlvPoint &  src, IlvPoint &  dst, const IlvTransformer *  t = 0  ) const

virtual

Computes the endpoints of the link when it is drawn as a straight line.

The default implementation computes the endpoints from the bounding boxes of the starting and ending nodes:

• If these rectangles do not intersect, the points are the middle of the sides of the rectangles to be joined.
• If the bounding boxes intersect, the method returns the center of each box.

This method is called by the default implementation of the IlvLinkImage::getLinkPoints method.

Parameters

src	The starting point of the link.
dst	The ending point of the link.
t	The transformer applied to the link.

Reimplemented in IlvArcLinkImage, and IlvPolylineLinkImage.

IlvGraphic* IlvLinkImage::getFrom

(

)

const

Returns the start node.

Returns

The start node.

virtual IlvPoint* IlvLinkImage::getLinkPoints ( IlUInt &  nPoints, const IlvTransformer *  t = 0  ) const

virtual

Returns the points defining the shape of the link.

Returns an array of points defining the shape of the link when it is drawn with the transformer t. The size of the resulting array of points is returned in the nPoints parameter. The array is stored in an IlPoolOf(IlvPoint) and should not be deleted or modified.
This method is internally used by the methods draw, contains, and boundingBox. It is meant to replace various methods defined in subclasses in previous releases of Rogue Wave Views; like the obsolete IlvOneLinkImage::getPoints.
This function is overloaded by subclasses defining a specific shape for links. The default implementation returns an array of two points computed with the IlvLinkImage::computePoints method.

Parameters

nPoints	The number of points in the returned array.
t	The transformer applied to the link.

Returns

The points defining the shape of the link.

Reimplemented in IlvArcLinkImage, IlvDoubleLinkImage, IlvOneSplineLinkImage, IlvOneLinkImage, and IlvPolylineLinkImage.

IlvGraphic* IlvLinkImage::getTo

(

)

const

Returns the end node.

Returns

The ending node.

IlBoolean IlvLinkImage::isOriented

(

)

const

Indicates whether the link is oriented.

Returns

IlTrue if the link is oriented (drawn with an arrowhead) and IlFalse otherwise.

void IlvLinkImage::setFrom

(

IlvGraphic *

f

)

Sets the start node.

If the link is already stored in a grapher, the drawing is automatically updated.

Parameters

f	The new starting node.

void IlvLinkImage::setOriented

(

IlBoolean

oriented

)

Changes the oriented mode.

Changes the image of the link to oriented (that is, it will be drawn with an arrowhead) if the parameter oriented is IlTrue. It removes the arrowhead if oriented is IlFalse.

Warning

Since this method changes the geometry of the link, it must be called using IlvManager::applyToObject if the link is stored in a grapher.

Parameters

oriented

IlTrue if the link is drawn with an arrowhead and IlTrue otherwise.

See Also

IlvGrapher::applyLinks.

void IlvLinkImage::setTo

(

IlvGraphic *

t

)

Sets the end node.

If the link is already stored in a grapher, the drawing is automatically updated.

Parameters

t	The new ending node.

virtual IlBoolean IlvLinkImage::zoomable ( ) const

virtual

Returns the zoomable property of the link.

A link is considered zoomable if both its start and end nodes are zoomable.

Returns

IlTrue if the link is zoomable and IlFalse otherwise.

Reimplemented in IlvLinkLabel, and IlvLinkHandle.