When a Panner object is added to a CoordinateRect, it becomes possible to
"grab" the coordinate rectangle and pan it (that is, slide it around by
moving it with the mouse).
Panner() -
Constructor for class edu.hws.jcm.draw.Panner
Create a Panner object that will let the user pan the CoordinateRect
that contains the Panner by
right-clicking and dragging (or, on Macintosh, command-clicking).
A ParserContext holds all the state data for a parsing operation, including the
string that is being parsed, a pointer to the current position in that string,
and the most recently parsed token from the string.
If the style of the function is set to PIECEWISE_LINEAR,
then linear interpolation is used to find the value
of the functions for x-values between the points that define the function.