plot - graphics interface
Files of this format are produced by routines described in plot(3X) and plot(3F), 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 inte-
ger. The last designated point in an l, m, n, a, or p instruction becomes the `current
point' for the next instruction. The a and c instructions change the current point in a
manner dependent upon the specific device.
Each of the following descriptions begins with the name of the corresponding routine in
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.
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 cur-
rent 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-
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,' `shortdashed,' 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 follow-
ing 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(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 displayable on devices whose face isn't square.
4013 space(0, 0, 780, 780);
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), plot(3F), graph(1G)
7th Edition May 15, 1985 PLOT(5)