PLOT(5) 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 disambiguate 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 com-
mand becomes the `current point' (X, Y) for the next com-
mand. 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.)
PLOT(5) PLOT(5)
cl[osepl] Close plotting device.
Basic Plotting Commands
e[rase] Start another frame of output or erase the screen
on CRT terminals 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 back-
slash (`\').
a[rc] x1 y1 x2 y2 xc yc r
Draw a circular arc from x1 y1 to x2 y2 with cen-
ter xc yc and radius r. If the radius is positive,
the arc is drawn counterclockwise; 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
PLOT(5) PLOT(5)
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 upper 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 connected.
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.
PLOT(5) PLOT(5)
de[fine] string { commands }
Define string as commands.
ca[ll] string scale
Invoke commands defined as string applying scale
to all coordinates.
Commands Controlling the Environment
co[lor] string
Draw lines with color string. Available colors
depend on the device. String may contain defini-
tions 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 con-
tain the definitions 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)
PLOT(5) PLOT(5)
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 possible.
Range settings that exactly fill the plotting area
with unity scaling appear below for devices sup-
ported 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 non-
square 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 specified 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 environment.
re[store] Restore previous environment.
SEE ALSO
plot(1), plot(3), graph(1)