XChangePointerControl(3X11)XLIB

NAME
       XChangePointerControl, XGetPointerControl - control
       pointer

SYNTAX
       XChangePointerControl(display, do_accel, do_threshold,
       accel_numerator,
                               accel_denominator, threshold)
             Display *display;
             Bool do_accel, do_threshold;
             int accel_numerator, accel_denominator;
             int threshold;

       XGetPointerControl(display, accel_numerator_return,
       accel_denominator_return,
                              threshold_return)
             Display *display;
             int *accel_numerator_return,
       *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 mul-
                 tiplier.

       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 point-
       ing device moves.  The acceleration, expressed as a frac-
       tion, is a multiplier for movement.  For example, specify-
       ing 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_denomi-
       nator argument.

       XChangePointerControl can generate a BadValue error.

       The XGetPointerControl function returns the pointer's cur-
       rent acceleration multiplier and acceleration threshold.

DIAGNOSTICS
       BadValue  Some numeric value falls outside the range of
                 values accepted by the request.  Unless a spe-
                 cific 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