plot(5)
Name
plot − graphics interface
Description
Files in this format are produced by the routines described in plot() and are interpreted for various devices by commands described in plot(.).
A graphics file is a stream of plotting instructions. Each instruction consists of an ASCII letter, usually followed by bytes of binary information, executed in order. A point is designated by four bytes representing the x and y values and 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.
In the following descriptions, the name of the corresponding routine in plot() is enclosed in parenthesis:
a (arc)The first four bytes are the center, the next four provide the starting point, and the last four bytes designate 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 provide the center of the circle and the next two bytes designate the radius.
e (erase)Start another frame of output.
f (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. This is only effective in the following plots: 4014, ver, lvp16, and hp7475a.
l (line)Draw a line from the point designated by the next four bytes to the point provided by the following four bytes.
m (move)The next four bytes provide a new current point.
n (cont)Draw a line from the current point to the point designated by the next four bytes. For further information, see plot(.).
p (point)Plot the point provided by the next four bytes.
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 is magnified or reduced to fit the device as closely as possible.
Space settings that fill the plotting area with unity scaling are listed below for devices supported by the filters of plot(.). In each of the following cases, the plotting area is assumed square; points outside the square can be displayed on devices that have areas which are not square:
4014space(0, 0, 3120, 3120);
verspace(0, 0, 2048, 2048);
300, 300sspace(0, 0, 4096, 4096);
450space(0, 0, 4096, 4096);
aedspace(0, 0, 511, 482)
bitgraphspace(0, 0, 768, 1024)
dumbspace(0, 0, 132, 90)
gigispace(0, 0, 767, 479)
grnspace(0, 0, 512, 512)
hp7221space(0, 0, 1800, 1800)
lvp16space(0, 0, 10365, 7962) (Paper Size: MET A)
space(0, 0, 16640, 10365) (Paper Size: MET B)
space(0, 0, 11040, 7721) (Paper Size: US A4)
space(0, 0, 16150, 11040) (Paper Size: US A3)
space(0, 0, 7721, 7721) (Default)
hp7475aSame as for lvp16.
t (label)Place the first character of the following ASCII string on the current point. This string is terminated by a newline character.