plot - graphics interface
Files of this format are interpreted for various devices by
commands described in plot(1B). A graphics file is a stream
of plotting instructions. Each instruction consists of an
ASCII letter usually followed by bytes of binary informa-
tion. The instructions are executed in order. A point is
designated by four bytes representing the x and y values;
each value is a signed integer. The last designated point in
an l, m, n, or p instruction becomes the ``current point''
for the next instruction.
m Move: the next four bytes give a new current point.
n Cont: draw a line from the current point to the point
given by the next four bytes. See plot(1B).
p Point: plot the point given by the next four bytes.
l Line: draw a line from the point given by the next
four bytes to the point given by the following four
t Label: place the following ASCII string so that its
first character falls on the current point. The string
is terminated by a NEWLINE.
a Arc: the first four bytes give the center, the next
four give the starting point, and the last four give
the end point of a circular arc. The least significant
coordinate of the end point is used only to determine
the quadrant. The arc is drawn counter-clockwise.
c Circle: the first four bytes give the center of the
circle, the next two the radius.
e Erase: start another frame of output.
f Linemod: take the following string, up to a NEWLINE,
as the style for drawing further lines. The styles are
``dotted,'' ``solid,'' ``longdashed,'' ``short-
dashed,'' and ``dotdashed.'' Effective only in plot
4014 and plot ver.
s Space: the next four bytes give the lower left corner
of the plotting area; the following four give the
upper right corner. The plot will be magnified or
reduced to fit the device as closely as possible.
Space settings that exactly fill the plotting area
with unity scaling appear below for devices supported
by the filters of plot(1B). The upper limit is just
outside the plotting area.
In every case the plotting area is taken to be square;
points outside may be displayable on devices whose face is
4014 space(0, 0, 3120, 3120);
ver space(0, 0, 2048, 2048);
space(0, 0, 4096, 4096);
450 space(0, 0, 4096, 4096);
Man(1) output converted with