XChangePointerControl, XGetPointerControl - control pointer
SYNTAX
int XChangePointerControl(Display *display, Bool do_accel,
Bool do_threshold, int accel_numerator, int
accel_denominator, int threshold);
int XGetPointerControl(Display *display, int
*accel_numerator_return, int *accel_denominator_return, int
*threshold_return);
ARGUMENTS
accel_denominator
Specifies the denominator for the acceleration multiplier.
accel_denominator_return
Returns the denominator for the acceleration multiplier.
accel_numerator
Specifies the numerator for the acceleration multiplier.
accel_numerator_return
Returns the numerator for the acceleration multiplier.
display
Specifies the connection to the X server.
do_accel
Specifies a Boolean value that controls whether the values for
the accel_numerator or accel_denominator are used.
do_threshold
Specifies a Boolean value that controls whether the value for the
threshold is used.
threshold
Specifies the acceleration threshold.
threshold_return
Returns the acceleration threshold.
DESCRIPTION
The
XChangePointerControl
function defines how the pointing device moves.
The acceleration, expressed as a fraction, is a
multiplier for movement.
For example,
specifying 3/1 means the pointer moves three times as fast as normal.
The fraction may be rounded arbitrarily by the X server.
Acceleration
only takes effect if the pointer moves more than threshold pixels at
once and only applies to the amount beyond the value in the threshold argument.
Setting a value to -1 restores the default.
The values of the do_accel and do_threshold arguments must be
True
for the pointer values to be set,
or the parameters are unchanged.
Negative values (other than -1) generate a
BadValue
error, as does a zero value
for the accel_denominator argument.
XChangePointerControl
can generate a
BadValue
error.
The
XGetPointerControl
function returns the pointer's current acceleration multiplier
and acceleration threshold.
DIAGNOSTICS
BadValue
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined
by the argument's type is accepted. Any argument defined as a set of
alternatives can generate this error.
