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glutDialsFunc(3GLUT)                                GLUT                                glutDialsFunc(3GLUT)



NAME
       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 callback 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  glutDeviceGet(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(3G), glutDeviceGet(3G)


AUTHOR
       Mark J. Kilgard (mjk@nvidia.com)



GLUT                                                 3.7                                glutDialsFunc(3GLUT)