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how to create a graph representing a big tree(parents and children are known)

 
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Thank you so much!
Also, I need to write the graph into a jpg/gif file or display the graph in the web browser.

I got a code from JGraph and can create the graph I want, however, JGraph define the graph as class Gscene instead of Img or BufferedImg or RenderedImg. Therefore, I couldn't use ImageIO.write(image, ext, file) to write the graph into a jpg file.
 
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