Fader objects are created using the following functions.  Faders are drawn between a starting point (x1, y1) and an ending point (x2, y2).

There are two types of faders, a horizontal fader (HFader) and a vertical fader (VFader).

HFader(x1, y1, x2, y2, minValue, maxValue, startValue, updateFunction, foreground, background, outline, thickness)

Creates a horizontal fader from point x1, y1, to point x2, y2. minValue is the smallest possible value (default is 0). maxValue is the largest possible value (default is 999). startValue is the initial fader setting (default is half way). updateFunction specifies what to do when the fader is moved. foreground is the active level color (default is Color.RED). background is the background color (default is Color.BLACK). outline is the outline color (default is Color.BLACK). thickness is the outline thickness in pixels (default is 3).

VFader(x1, y1, x2, y2, minValue, maxValue, startValue, updateFunction, foreground, background, outline, thickness)

Creates a vertical fader.  Everything else is same as above.

You can create a fader as follows:

from gui import *

d = Display()

# function to specify what happens when fader is moved
def printValue(value):
   print value   # replace this with whatever needs to happen

fader = VFader(25, 5, 45, 80, 0, 100, 50, printValue)
d.add(fader)

Once a fader has been created, the following functions are available:

Function	Description
fader.getValue()	Returns the current value of the fader.
fader.setValue(value)	Sets the current value of the fader to value.