value when the mouse is on the left side of the screen
value when the mouse is on the right side of the
screen. Note: this value is never reached, because
the maximum mouse coordinate is one pixel less than the
screen size. For example, if the screen width is 1440,
lo is 0.0 and
hi is 1.0, the maximum value output is
1.0 * 1439/1440 = 0.999306 .
curve shape. Either zero (default) for a linear
mapping, or 1 for an exponential mapping. Note:
When using exponential mapping, make sure the
is greater than zero, otherwise NaN values will be
60 dB decay time of a lag-time smoothing. Use zero to avoid any smoothing.