TGraphLink Delphi component - Version 3.05 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.