plot - graphics interface
Files of this format are produced by routines described in plot(3X),
and are interpreted for various devices by commands described in
plot(1G). A graphics file is a stream of plotting instructions. Each
instruction consists of an ASCII letter usually followed by bytes of
binary information. 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.
Each of the following descriptions begins with the name of the corre-
sponding routine in plot(3X).
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(1G).
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 bytes.
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,' `long-
dashed,' `shortdashed,' and `dotdashed.' Effective only in plot
4014 and plot ver.
s space: The next four bytes give the lower left corner of the plot-
ting area; the following four give the upper right corner. The plot
will be magnified or reduced to fit the device as closely as possi-
Space settings that exactly fill the plotting area with unity scal-
ing appear below for devices supported by the filters of plot(1G).
The upper limit is just outside the plotting area. In every case
the plotting area is taken to be square; points outside may be dis-
playable on devices whose face isn't square.
4014 space(0, 0, 3120, 3120);
ver space(0, 0, 2048, 2048);
300, 300s space(0, 0, 4096, 4096);
450 space(0, 0, 4096, 4096);
plot(1G), plot(3X), graph(1G)
15 January 1983 PLOT(5)