glutDialsFunc  - sets the dial & button box dials callback
       for the current window.

SYNTAX

       void glutDialsFunc(void (*func)(int dial, int value));

ARGUMENTS

       func      The new dials callback function.

DESCRIPTION

       glutDialsFunc sets the dial & button  box  dials  callback
       for  the current window. The dial & button box dials call-
       back for a window is called when the  window  has  dial  &
       button box input focus (normally, when the mouse is in the
       window) and the user generates  dial  &  button  box  dial
       changes.  The  dial  parameter  will  be  the  dial number
       (starting at one). The number of available dial  &  button
       box    dials    can    be    determined    with    glutDe-
       viceGet(GLUT_NUM_DIALS). The value measures  the  absolute
       rotation in degrees. Dial values do not ``roll over'' with
       each complete rotation but continue to accumulate  degrees
       (until the int dial value overflows).

       Registering a dial & button box dials callback when a dial
       & button box device is not available  is  ineffectual  and
       not  an  error.  In  this case, no dial & button box dials
       callbacks will be generated.

       Passing NULL to glutDialsFunc disables the  generation  of
       dial  &  button  box dials callbacks. When a new window is
       created, no dial & button box dials callback is  initially
       registered.

SEE ALSO

       glutButtonBoxFunc, glutDeviceGet

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)