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CentOS 7.0 - man page for xchangepointercontrol (centos section 3)

XChangePointerControl(3)		  XLIB FUNCTIONS		 XChangePointerControl(3)

NAME
       XChangePointerControl, XGetPointerControl - control pointer

SYNTAX
       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);

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_numera-
		 tor 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 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.

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 - C Language X Interface

X Version 11				   libX11 1.6.0 		 XChangePointerControl(3)


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