In our implementation, potentiometers are subclasses of jog knobs (FISJog). The basic difference is that we expose the current value of the knob (accessed using getVal()and setVal()), and also impose limits on the value, as opposed to the jog in which we do not show the value publically (since the value/knob position is not important for a jog, just the relative change).

We provide two types of potentiometers, the basic potentiometer (FISPot) and the potentiometer that allows attached graphics for the indicator (FISPotAttach). These are similar to FISJog and FISJogAttach, respectively. Since the value is exposed, you can set maximum and minimum values for the potentiometer, even if the values are beyond one revolution. Like the jogs, you can choose between a click-and-drag turn, or a mouse-over turn. The potentiometer extends the jog by exposing the

One interesting feature technically of the jog (but really mostly useful for the potentiometer) is the "snap-to-integer" property of FISPotAttach. This feature lets the user move the knob in a continuous fashion, but when the user releases the mouse, the knob snaps into position at the closest integer step. This simulates physical knobs that have distinct positions at rest, but continuous movement.