plot -- graphics interface


Files of this format are produced by routines described in plot(S) and are interpreted for various devices by commands described in tplot(ADM). 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 corresponding routine in plot(S).

move: The next four bytes generate a new current point.

cont: Draw a line from the current point to the point given by the next four bytes (see tplot(ADM)).

point: Plot the point given by the next four bytes.

line: Draw a line from the point given by the next four bytes to the point given by the following four bytes.

label: Place the following ASCII string so that its first character falls on the current point. The string is terminated by a newline character.

erase: Start another frame of output.

linemod: Take the following string, up to a new line, as the style for drawing further lines. The styles are dotted, solid, longdashed, shortdashed, and dotdashed. Effective only for the -T4014 and -Tver options of tplot(ADM) (TEKTRONIX 4014 terminal and VERSATEC plotter).

space: The next four bytes give the lower left corner of the plotting area; the following four give the upper right corner. The plot is magnified or reduced to fit the device as closely as possible.
Space settings that exactly fill the plotting area with unit-y scaling are shown for devices supported by the filters of tplot(ADM). 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 not square.

DASI 300
space(0, 0, 4096, 4096);

DASI 300s
space(0, 0, 4096, 4096);

DASI 450
space(0, 0, 4096, 4096);

space(0, 0, 3120, 3120);

VERSATEC plotter
space(0, 0, 2048, 2048);


The plotting library plot(S) and the curses library curses(S) both use the names erase and move. The curses versions are macros. If you need both libraries, put the plot(S) code in a different source file than the curses(S) code, and/or undefine (using #undef move and erase in the plot(S) code.

See also

graph(ADM), plot(S), term(M), tplot(ADM)
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