Have you ever tried Fusion Charts?
This is the best graphics library I've seen. I used them for web and iOS projects since they now have JS versions of everything.
Quite complicated graphics, a wide range of graphs and even real-time widgets that can meet your specific needs for this project.
They are not free, but they deserve attention. I did everything related to the pilots and demo projects with a trial version.
Check them out at http://www.fusioncharts.com/demos/gallery/
Juan gonzález
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