term% cat index.txt PLOT(5) File Formats Manual PLOT(5)
NAME
plot - graphics interface
DESCRIPTION
Files of this format are produced by routines described in plot(3), and
are interpreted for various devices by commands described in plot(1).
A graphics file is an ASCII stream of instruction lines. Arguments are
delimited by spaces, tabs, or commas. Numbers may be floating point.
Punctuation marks (except `:'), spaces, and tabs at the beginning of
lines are ignored. Comments run from `:' to newline. Instructions
may be the whole function name or just enough characters to disam‐
biguate it. (Thus ..line, line, or li are all valid instructions.)
Arguments are interpreted as follows:
1. If an instruction requires no arguments, the rest of the line is
ignored.
2. If it requires a string argument, then all the line after the
first field separator is passed as argument. Quote marks may be
used to preserve leading blanks. Strings may include newlines
represented as `\n'.
3. Between numeric arguments alphabetic characters and punctuation
marks are ignored. Thus
line from 5 6 to 7 8
draws a line from (5, 6) to (7, 8).
4. Instructions with numeric arguments remain in effect until a new
instruction is read. Such commands may spill over many lines.
Thus the following sequence will draw a polygon with vertices
(4.5, 6.77), (5.8, 5.6), (7.8, 4.55), and (10.0, 3.6).
move 4.5 6.77
vec 5.8, 5.6 7.8
4.55 10.0, 3.6 4.5, 6.77
The instructions are executed in order. The last designated point in a
line, move, rmove, vec, rvec, arc or point command becomes the `current
point' (X, Y) for the next command. Each of the following descriptions
corresponds to a routine in plot(3).
Open & Close
o[penpl] string
Open plotting device. For troff string specifies the size of
the plot (default is 6i.)
cl[osepl] Close plotting device.
Basic Plotting Commands
e[rase] Start another frame of output or erase the screen on CRT ter‐
minals without scroll.
m[ove] x y
Current point becomes x y.
rm[ove] dx dy
Current point becomes X+dx Y+dy.
poi[nt] x y
Plot the point x y and make it the current point.
v[ec] x y Draw a line from the current point to x y.
li[ne] x1 y1 x2 y2
Draw a line from x1 y1 to x2 y2. Make the current point x2
y2.
t[ext] string
Place the following ASCII string so that its first character
is centered on the current point (default). If string begins
with `\C', the string is centered on the current point. If
string begins with `\R', the string is right adjusted on the
current point. A backslash at the beginning of the string
may be escaped with another backslash (`\').
a[rc] x1 y1 x2 y2 xc yc r
Draw a circular arc from x1 y1 to x2 y2 with center xc yc and
radius r. If the radius is positive, the arc is drawn coun‐
terclockwise; if the radius is negetive, the arc is drawn
clockwise. The starting point is exact but the ending point
is approximate.
ci[rcle] xc yc r
Draw a circle centered at xc yc with radius r. If the range
and frame parameters do not specify a square, the circle will
be elliptical.
di[sc] xc yc r
Draw a solid circle centered at xc yc with radius r using the
filling color (see cfill below). disc only works on the
5620; on other devices disc is the same as circle.
bo[x] x1 y1 x2 y2
Draw a box with lower left hand corner at x1 y1 and upper
right hand corner at x2 y2.
sb[ox] x1 y1 x2 y2
Draw a solid box with lower lefthand corner at x1 y1 and up‐
per righthand corner at x2 y2 using the filling color (see
cfill below).
par[abola] x1 y1 x2 y2 xg yg
Draw a parabola from x1 y1 to x2 y2 `guided' by xg yg. The
parabola passes through the midpoint of the line joining xg
yg with the midpoint of the line joining x1 y1 and x2 y2 and
is tangent to the lines from xg yg to the endpoints.
pol[y] { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
Draw polygons with vertices x1 y1 ... xn yn and X1 Y1 ... Xm
Ym. If only one polygon is specified, the inner brackets are
not needed. If square brackets `[ ]' are used, the first
vertex is repeated at the end of the list to close the poly‐
gon.
fi[ill] { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
Fill a polygon. The arguments are the same as those for poly
above except that the first vertex is automatically repeated
to close each polygon. The polygons do not have to be con‐
nected. Enclosed polygons appear as holes.
sp[line] { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
Draw a parabolic spline guided by x1 y1 ... xn yn with simple
endpoints.
fsp[line] { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
Draw a parabolic spline guided by x1 y1 ... xn yn with double
first endpoint.
lsp[line] { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
Draw a parabolic spline guided by x1 y1 ... xn yn with double
last endpoint.
dsp[line] { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
Draw a parabolic spline guided by x1 y1 ... xn yn with double
endpoints.
csp[line] { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
Draw a closed parabolic spline guided by x1 y1 ... xn yn.
in[clude] filename
Take commands from file filename.
de[fine] string { commands }
Define string as commands.
ca[ll] string scale
Invoke commands defined as string applying scale to all coor‐
dinates.
Commands Controlling the Environment
co[lor] string
Draw lines with color string. Available colors depend on the
device. String may contain definitions for several devices
separated by ``/''. Colors possible for the various devices
are:
pen black, red, green, blue, Tblack, Tred, Tgreen, Tblue
(assumes default carousel, T=thick)
1-8 (pen number)
/Snumber character size as a % of plotting area
ramtek red, green, blue, magenta, yellow, cyan, white
troff /Fstring font
/Pnumber point size
2621 /Hcharacter used for plotting
pe[n] string
Use string as the style for drawing lines. Not all pen
styles are implemented for all devices. String may contain
definitions for several devices separated by ``/''. The
available pen styles are:
pen solid, dott[ed], short, long, dotd[ashed], cdash, ddash
where cdash and ddash are combinations of long and short
4014 solid, dott[ed], short, long, dotd[ashed], ddash
troff solid, dash where only straight lines will be dashed
5620 /Bnumber for line thickness
2621 /Hcharacter character used for plotting
cf[ill] string
Use string as color for filling. String may contain the def‐
initions for several devices separated by `/'. The following
colors are available on the specified devices:
pen black, red, green, blue, Tblack, Tred, Tgreen, Tblue
1-8 pen number
ramtek red, green, blue, magenta, yellow, cyan, white
5620 /Btexture string with octal numbers for texture; see types(9.5).
The 16 words of texture should be followed by one word for the mode used
by texture (see bitblt(9.3)
2621 /Hcharacter character to use for filling
All devices
/Adegrees angle of slant of shading lines
/Gnumber gap between shading lines (in user units)
ra[nge] x1 y1 x2 y2
The data will fall between x1 y1 and x2 y2. The plot will be
magnified or reduced to fit the device as closely as possi‐
ble.
Range settings that exactly fill the plotting area with unity
scaling appear below for devices supported by the filters of
plot(1). 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 with nonsquare faces.
4014 range(0.,, 0.,, 3120.,, 3120.);
troff range(0.,0.,6144., 6144.);
ramtek range(0., 0., 511., 511.);
2621 range(0., 0., 22., 22.);
5620 range dependent on layer size
pen range dependent on paper size
fr[ame] px1 py1 px2 py2
The data will be plotted in the fraction of the display spec‐
ified by px1 py1 for lower lefthand corner and px2 py2 for
upper righthand corner. Thus frame .5 0 1. .5 plots in the
lower right quadrant of the display; frame 0. 1. 1. 0. uses
the whole display but inverts the y coordinates.
sa[ve] Save the current environment, and move to a new one. The new
environment inherits the old one. There are 7 levels of en‐
vironment.
re[store] Restore previous environment.
SEE ALSO
plot(1), plot(3), graph(1)
PLOT(5)