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.ds xT X Toolkit Intrinsics \- C Language Interface
.ds xW Athena X Widgets \- C Language X Toolkit Interface
.ds xL Xlib \- C Language X Interface
.ds xC Inter-Client Communication Conventions Manual
.TH XChangePointerControl 3 "libX11 1.8.12" "X Version 11" "XLIB FUNCTIONS"
.SH NAME
XChangePointerControl, XGetPointerControl \- control pointer
.SH SYNTAX
.HP
int XChangePointerControl\^(\^Display *\fIdisplay\fP\^, Bool \fIdo_accel\fP\^,
Bool \fIdo_threshold\fP\^, int \fIaccel_numerator\fP\^, int
\fIaccel_denominator\fP\^, int \fIthreshold\fP\^);
.HP
int XGetPointerControl\^(\^Display *\fIdisplay\fP\^, int
*\fIaccel_numerator_return\fP\^, int *\fIaccel_denominator_return\fP\^, int
*\fIthreshold_return\fP\^);
.SH ARGUMENTS
.IP \fIaccel_denominator\fP 1i
Specifies the denominator for the acceleration multiplier.
.IP \fIaccel_denominator_return\fP 1i
Returns the denominator for the acceleration multiplier.
.IP \fIaccel_numerator\fP 1i
Specifies the numerator for the acceleration multiplier.
.IP \fIaccel_numerator_return\fP 1i
Returns the numerator for the acceleration multiplier.
.IP \fIdisplay\fP 1i
Specifies the connection to the X server.
.IP \fIdo_accel\fP 1i
Specifies a Boolean value that controls whether the values for
the accel_numerator or accel_denominator are used.
.IP \fIdo_threshold\fP 1i
Specifies a Boolean value that controls whether the value for the
threshold is used.
.IP \fIthreshold\fP 1i
Specifies the acceleration threshold.
.IP \fIthreshold_return\fP 1i
Returns the acceleration threshold.
.SH DESCRIPTION
The
.B 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
.B True
for the pointer values to be set,
or the parameters are unchanged.
Negative values (other than \-1) generate a
.B BadValue
error, as does a zero value
for the accel_denominator argument.
.LP
.B XChangePointerControl
can generate a
.B BadValue
error.
.LP
The
.B XGetPointerControl
function returns the pointer's current acceleration multiplier
and acceleration threshold.
.SH DIAGNOSTICS
.TP 1i
.B 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.
.SH "SEE ALSO"
\fI\*(xL\fP
