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X11R7.4 - man page for xchangepointercontrol (x11r4 section 3)

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XChangePointerControl(3)		  XLIB FUNCTIONS		 XChangePointerControl(3)

       XChangePointerControl, XGetPointerControl - control pointer

       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_denomina-
	      tor_return, int *threshold_return);

		 Specifies the denominator for the acceleration multiplier.

		 Returns the denominator for the acceleration multiplier.

		 Specifies the numerator for the acceleration multiplier.

		 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_numera-
		 tor or accel_denominator are used.

		 Specifies a Boolean value that controls whether the value for the threshold is

       threshold Specifies the acceleration threshold.

		 Returns the acceleration threshold.

       The XChangePointerControl function defines how the pointing device moves.  The accelera-
       tion, 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 arbi-
       trarily 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.

       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.

       Xlib - C Language X Interface

X Version 11				   libX11 1.2.1 		 XChangePointerControl(3)
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