The TGraphLink component is designed to represent and
display graph edge for both directed and undirected
graphs in a Borland Delphi program. It is a line
connecting two points (nodes) and optional one or two
arrows on this line. You can change: the line width;
arrow's style, color and size; arrow location on the
edge. At run-time you can determine if the point is on
the graph edge. OnMouseDown event for this component
occurs when you press a mouse button with the mouse
pointer on line or arrow representing the graph edge,
NOT on the whole control rectangle.

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