The library is developing, there's a set of examples ready, such as line graphs, bars, area graphs, pies and donuts etc.
Special functionalities are developed: pop-up data about points on the graphs, focusing on one graph line, ignoring a graph line, selecting ranges and points etc. Also data update is available. The examples can be seen here: c3js.org/examples.
We have added a new issue at Drupal.org.
Shortly, the needs of warehouse management are discussed. There is a concept of supply-demand analysis in terms of products and stores.
Ordered products are analysed in terms of sufficiency of warehouse stocks. The visualisation suggested is a double pie chart, like this one: