XChangePointerControl(3X11XLIB FUNCTIOXChangePointerControl(3X11)NAME
XChangePointerControl, XGetPointerControl - control
pointer
SYNTAX
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 mul-
tiplier.
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(3X11XLIB FUNCTIOXChangePointerControl(3X11)DESCRIPTION
The XChangePointerControl function defines how the point-
ing device moves. The acceleration, expressed as a frac-
tion, is a multiplier for movement. For example, specify-
ing 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_denomi-
nator argument.
XChangePointerControl can generate a BadValue error.
The XGetPointerControl function returns the pointer's cur-
rent acceleration multiplier and acceleration threshold.
DIAGNOSTICS
BadValue Some numeric value falls outside the range of
values accepted by the request. Unless a spe-
cific 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
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