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Documentation about the Chart Generation functions still has to be migrated to this community page ... and needs further completion (e.g. to ensure it is D7 compliant also ...).
Anybody familiar with the views UI can use the chart module to create charts without coding PHP snippets, as one typically does when using the Chart API.
So site building knowledge is sufficient to create charts using Views, you don't have to be like an experienced Drupal developer (who probably would rather want to use the Chart API instead).
The following describes the parameters which can be entered manually or used along with the helper functions to create what is called the Chart API array structure of the Chart module.
The Chart module provides a unified Application Programming Interface (the Chart API for short) for the integration of the Google Image Charts charting library in a Drupal site.
This Chart API is typically used by Drupal developers, by using it from within another Drupal module. Something that is typically done from within all sorts of Modules facilitating charting via the Chart module (and there are quite a few of them ...).