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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 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.
- 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 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,’’ ‘‘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 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 not square.
- space(0, 0, 3120, 3120);
- ver
- space(0, 0, 2048, 2048);
- 300, 300s
- space(0, 0, 4096, 4096);
- space(0, 0, 4096, 4096);