Init

DataGraph is a subclass of SApplet which contains the tools necessary for data connections between applets.  Since many Physlets make use of animation, the SApplet class contains a clock that can be shared among various applets.  The clock's time can, in fact be access using the SDataSource interface.

DataGraph is a useful tool for evaluating parsed functions for use in other Physlets.  The y axis will autoscale.