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 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