ZingChart: Setting a threshold or grouping slices in a pie chart
You can set a threshold for a pie chart which will group slices that are in value less than the threshold.
Here is the code on how to do this:
nav: { "threshold":"5%", "others": { "text":"Others", "backgroundColor":"black" } }
The others object sets the slice that includes all slices that are under the threshold level.
Here is a demo that shows how threshold works for pie charts: Demo