Display of relationships between nodes of multiple trees

Hello,
I am trying to develop a gui to display the relationship between multiple trees.
Tree1:------|---------------Tree2:----------------|--------Tree3:
------------|-------------------------------------|--------------
Root -------|----------------Root-----------------|--------Root
---Leaf1----|--------------------Node1------------|-----------LeafA
---Leaf2----|-----------------------Leaf11--------|-----------LeafB
---Leaf3----|-----------------------Leaf12--------|-----------LeafC
---Leaf4----|--------------------Node2
------------|-----------------------Leaf21
------------|-----------------------Leaf22
(The hyphens do not signifiy relationships, they are put there because the
preview takes away the blanks. The | characters are intended to act as separators
between adjacent trees.)
All the trees are scrollable and have been added to three different scrollpanes
and are displayed on a window. The relationships can only be between leaves
of the trees.
The only way I can figure out to show such relationships is by drawing lines
e.g. a line from Tree1.Leaf1 to Tree2.Leaf21 etc. Users may define relationships
by drawing lines from one tree node to another by dragging the mouse.
The lines may criss cross and there might be a lot of lines etc.
I would like to know about alternative ways to show such relationships on the
screen in a neater way.
I would also like a way to make lines "full fledged objects" e.g. they will get mouse
events such that actions can be triggered by double clicking or right clicking on a
line.
I would appreciate your help in this very much.
Best Regards,
Sandeepan

Joop Eggen and deriderj, thank you for your replies.
However, the JGraph framework is available only on Jsdk 1.4 and not on Jsdk 1.3.
I saw an item in the FAQ about the possibility of porting JGraph to 1.3 but there were
no links on the site for this.
I need to use Jsdk 1.3 as Jsdk1.4 is unsuported by the vendor of one of the tools that I need
to use and they do not have any plans to support 1.4 in the near future.
I would appreciate the forum's help in pointing out JGraph like functionality in Jsdk1.3 via some other API or maybe knowledge about whether someone has ported JGraph to Jsdk 1.3
Regards,
Sandeepan

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