RFC 336 (rfc336) - Page 2 of 2

Level 0 Graphic Input Protocol

NIC 9929
NWG/RFC# 336
Level 0 Graphic Input Protocol

                 Count is an integer number indicating the number of
                 characters (bytes) which follow.

                 Text String is a string of "Count" bytes of characters
                 in network ASCII.

              Position Input

                   Simple position data will be conveyed in the
              following format:

                   POSIT : DEVICE : COUNT : x : y

                 POSIT is a protocol code indicating that this string
                 contains position data.  For the present this code is
                 defined to be 2.

                 DEVICE is a code indicating the input device on which
                 this data was generated.  The codes are as defined
                 above.

                 COUNT is an integer number indicating the number of
                 bytes of data which follow.  This includes data for
                 both x and y coordinates.  Thus, the number of bytes of
                 x coordinate data is COUNT divided by 2.  At level 0,
                 COUNT should always be 4, since at this level all
                 coordinates are expressed in 2 bytes of data.

                 x and y coordinate data are represented as signed
                 fractions in the same fashion that position data is
                 represented in the Level 0 graphic output protocol.

           It should be emphasized that input data from a level 0
           graphics user which is not in a format described above should
           be sent on a different link than the graphics input link.
           This may be desirable for certain applications to avoid the
           overhead of the protocol.

       [ This RFC was put into machine readable form for entry ]
       [ into the online RFC archives by BBN Corp. under the   ]
       [ direction of Alex McKenzie.                   12/96   ]