How to realize single line in eclipse's file compare tool

You may use the eclipse's file compare tool, when it compare two files it display two files side by side, and connect ranges with single line. When you scroll the pane, these single lines with change their forms accrodingly but always connect ranges.
I'm programming a similar tool to the eclipse's file compare tool. I'd like to know which classes are related to this kind of "single line", any suggestion will be appreciated.
Best regards

Thank you very much for your reply.
In fact I am not sure what I am planning to do. If it is too complicated, I will modify the design and make it easier to realize. Cause I don't know any classe for drawing lines, do you know any more besides java.awt.geom.Line2D?
In addition, I posted another message related to this one. They are different parts of one same project, can you take a look at it?
Thank you very much.

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How to realize single line in eclipse's file compare tool

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