XChangePointerControl(3X) XChangePointerControl(3X)
NAME
XChangePointerControl, XGetPointerControl - control
pointer
SYNOPSIS
XChangePointerControl(display, do_accel, do_threshold,
accel_numerator,
accel_denominator, threshold)
Display *display;
Bool do_accel, do_threshold;
int accel_numerator, accel_denominator;
int threshold;
XGetPointerControl(display, accel_numerator_return,
accel_denominator_return,
threshold_return)
Display *display;
int *accel_numerator_return,
*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.
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XChangePointerControl(3X) XChangePointerControl(3X)
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.
SEE ALSO
Xlib Programming Manual
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