Mouse Keys - MouseKeysAccel

MouseKeysAccel

parameter	meaning
mk_delay	milliseconds between the initial key press and first repeated motion event
mk_interval	milliseconds between repeated motion events
mk_max_speed	steady speed (in action_delta units) applied each event
mk_time_to_max	number of events (count) accelerating to steady speed
mk_curve	ramp used to reach maximum pointer speed

The X Window System MouseKeysAccel control applies action (usually cursor movement) repeatedly while a direction key {1,2,3,4,6,7,8,9} remains depressed. When the key is depressed, an action_delta is immediately applied. If the key remains depressed, longer than mk_delay milliseconds, some action is applied every mk_interval milliseconds until the key is released. If the key remains depressed, after more than mk_time_to_max actions have been applied, action_delta magnified mk_max_speed times, is applied every mk_interval milliseconds.

The first mk_time_to_max actions increase smoothly according to an exponential.

$\mathrm{action\_delta} \times \mathrm{mk\_max\_speed} \times \left( \frac{ i } { \mathrm{mk\_time\_to\_max} } \right) ^{\frac{ 1000 + \mathrm{mk\_curve} } { 1000 }}$

mk_curve	result
-1000	uniform speed, linearly increasing action
0	uniform acceleration, linearly increasing speed
1000	uniform jerk, linearly increasing acceleration

These five parameters are configurable.