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_numer-
              ator_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 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



X Version 11               libX11 1.1.5  XChangePointerControl(3)