glutMotionFunc, glutPassiveMotionFunc - set the motion and
       passive motion callbacks respectively for the current win-
       dow.

SYNTAX

       void glutMotionFunc(void (*func)(int x, int y));
       void glutPassiveMotionFunc(void (*func)(int x, int y));

ARGUMENTS

       func      The  new motion or passive motion callback func-
                 tion.

DESCRIPTION

       glutMotionFunc and glutPassiveMotionFunc  set  the  motion
       and  passive  motion callback respectively for the current
       window. The motion callback for a window  is  called  when
       the  mouse moves within the window while one or more mouse
       buttons are pressed. The passive  motion  callback  for  a
       window  is  called  when the mouse moves within the window
       while no mouse buttons are pressed.

       The x and y callback parameters indicate the  mouse  loca-
       tion in window relative coordinates.

       Passing  NULL  to  glutMotionFunc or glutPassiveMotionFunc
       disables the generation of the  mouse  or  passive  motion
       callback respectively.

SEE ALSO

       glutMouseFunc, glutSpaceballMotionFunc, glutTabletMotionFunc

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)