XChangePointerControl man page on Ultrix

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XChangePointerControl(3X11)	     X11R5	   XChangePointerControl(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_denomina‐
       tor_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.

DESCRIPTION
       The 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 for the pointer values
       to be set, or the parameters are unchanged.  Negative values (other
       than -1) generate a error, as does a zero value for the accel_denomina‐
       tor argument.

       can generate a error.

       The function returns the pointer's current acceleration multiplier and
       acceleration threshold.

DIAGNOSTICS
       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

						   XChangePointerControl(3X11)
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