How can I plot a graph in sections???

Hi
This is what I am trying to do:
I have a graph class that uses a double array to plot.. surprisingly a graph. The problem is that the file that I am plotting from is too large to display all of its data at once on the screen.
What I am trying to do is have a forward and back button that will allow you to display a fixed chunk of data at a time.
Also does anybody know how to clone a double array????
Any help would be great...
Cheers...........

Read the file.
Write a funtion to return all values from
starting from start to end like
public double[] getData(int start, int end)
Use the charting tool to plot only the current set of
values.. Change the start and end parameters according to
what the user wants.. (forward or backward)
Try JFreechart... Its an excellent charting tool..

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