LinkItem
Name
LinkItem --  A canvas item for displaying a link between two nodes.
Description
 A CompositeCanvasItem for displaying a link between two NodeItems.
Methods
Phase: Creating
- -  setDirectedFlag:-  (BOOL) directedFlag-  For disabling directed link items. 
- -  setTo:-  (id <NodeItem>) to-  Designate the node that will be the destination of the link. 
- -  setFrom:-  (id <NodeItem>) from-  Designate the node that will be the source of the link. 
Phase: Using
- - (void) update-  Redraw the link (especially due to the motion of nodes). 
- - (void) setColor:-  (const char *) aColor-  Set the color of the link.