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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_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 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 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 accelera-tion acceleration
       tion 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 1.2.1                        XChangePointerControl(3)