XChangePointerControl(3) XLIB FUNCTIONS XChangePointerControl(3)
NAME
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 accelera-
tion 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.
SEE ALSO
Xlib - C Language X Interface
X Version 11 libX11 1.8.4 XChangePointerControl(3)
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