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 accelera-
       tion 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 1.1.1         XChangePointerControl(3)