RFC 86 (rfc86) - Page 2 of 6

Proposal for a Network Standard Format for a Data Stream to Control Graphics Display

The NGDS is accepted into the local Host and interpreted by the NGSI.  The

NGSI is a process which modifies the NGDL according to inputs in the NGDS.

The NGDL is the display list for the NGLI; the NGLI executes the NGDL and

controls the beam which writes on the NGS.



The NGS is square, has horizontal and vertical sides, and positions on it

are specified by an ordered pair of unsigned 16 bit fractions.  The first

fraction specifies the horizontal distance from the left hand edge, and

the second specifies the vertical distance from the bottom edge.  The

resolution of the screen is unspecified.



The lack of specification of the resolution of the NGS is intentional;

programs designers should not interpret this to mean that they may impose

a particular requirement on the using system.  Thus the quality of the

displayed picture should degrade gradually with decreasing resolution.



The NGLI has primitives for moving the beam to a particular point, intensify-

ing a point, drawing a vector, or drawing a character.  Characters are

assumed to be not more than .015 screen width wide, and not more than .025

screen height high.  When the beam is moved to a screen position before

drawing characters, that position should be at the lower left hand corner

of the first character drawn.  The beam position after drawing a character

is immediately to the right of the character, properly positioned for another

character.  However, after drawing one or more characters, the exact horizontal