double
touchpad_accel_profile_linear(struct motion_filter *filter,
void *data,
double speed_in, /* units/us */
uint64_t time)
{
double factor; /* unitless */
speed_in *= TP_MAGIC_SLOWDOWN;
factor = pointer_accel_profile_linear(filter, data, speed_in, time);
return factor * TP_MAGIC_SLOWDOWN;
}
static void
print_accel_func(struct motion_filter *filter)
{
double vel;
printf("# gnuplot:\n");
printf("# set xlabel \"speed\"\n");
printf("# set ylabel \"raw accel factor\"\n");
printf("# set style data lines\n");
printf("# plot \"gnuplot.data\" using 1:2\n");
for (vel = 0.0; vel < 3.0; vel += .0001) {
double result = pointer_accel_profile_linear(filter,
NULL,
vel,
0 /* time */);
printf("%.4f\t%.4f\n", vel, result);
}
}
double
touchpad_accel_profile_linear(struct motion_filter *filter,
void *data,
double speed_in,
uint64_t time)
{
/* Once normalized, touchpads see the same
acceleration as mice. that is technically correct but
subjectively wrong, we expect a touchpad to be a lot
slower than a mouse. Apply a magic factor here and proceed
as normal. */
const double TP_MAGIC_SLOWDOWN = 0.4;
double speed_out;
speed_in *= TP_MAGIC_SLOWDOWN;
speed_out = pointer_accel_profile_linear(filter, data, speed_in, time);
return speed_out * TP_MAGIC_SLOWDOWN;
}
