

 
Manual Reference Pages  PLOT (7)
NAME
plot  graphics interface
CONTENTS
Description
DESCRIPTION
Files of this format are interpreted by
plot(1)
to draw graphics on the screen.
A
plot file is a
UTF 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.
Extra letters appended to a valid instruction are ignored.
Thus
all mean the same thing.
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

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.
Open & Close
o string 
Open plotting device.
For
troff,
string specifies the size of the plot
(default is

cl 
Close plotting device.


Basic Plotting Commands
e 
Start another frame of output.

m x y 
(move) Current point becomes
x y.

rm dx dy 
Current point becomes
X+dx Y+dy.

poi x y 
Plot the point
x y and make it the current point.

v x y 
Draw a vector from the current point to
x y.

rv dx dy 
Draw vector from current point to
X+dx
Y+dy

li x1 y1 x2 y2  
Draw a line from
x1 y1 to
x2 y2. Make the current point
x2 y2.

t string 
Place the
string so that its
first character is centered on the current point (default).
If
string begins with
it is centered (rightadjusted) on the current point.
A backslash at the beginning of the string may
be escaped with another backslash.

a 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 counterclockwise;
negative, clockwise.
The starting point is exact but the ending point is approximate.

ci 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 xc yc r 
Draw a disc centered at
xc yc with radius
r using the filling color (see
cfill below).

bo x1 y1 x2 y2  
Draw a box with lower left corner at
x1 y1 and upper right corner at
x2 y2.

sb x1 y1 x2 y2  
Draw a solid box with lower left corner at
x1 y1 and upper right corner at
x2 y2 using the filling color (see
cfill below).

par 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 { {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.

fi { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }  
Fill a polygon.
The arguments are the same as those for
pol 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 { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }  
Draw a parabolic spline guided by
x1 y1 ... xn yn with simple endpoints.

fsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }  
Draw a parabolic spline guided by
x1 y1 ... xn yn with double first endpoint.

lsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }  
Draw a parabolic spline guided by
x1 y1 ... xn yn with double last endpoint.

dsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }  
Draw a parabolic spline guided by
x1 y1 ... xn yn with double endpoints.

csp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
in filename  
(include) Take commands from
filename.

de string { commands }  
Define
string as
commands.

ca string scale  
Invoke commands defined as
string applying
scale to all coordinates.


Commands Controlling the Environment
co string 
Use color given by first character of
string, one of
red,
yellow,
green,
blue,
cyan,
magenta,
white, and
kblack. If
string begins with a digit, it is taken to be
a 32bit number specifying 8 bit each of red, green, blue, and alpha.
For example,
0xFFFF00FF denotes solid yellow.

pe string 
Use
string as the style for drawing lines.
The available pen styles are:
solid,
dott[ed],
short,
long,
dotd[ashed],
cdash,
ddash

cf string 
Color for filling (see
co, above).

ra 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 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.

fr px1 py1 px2 py2  
Plot the data in the fraction of the display
specified by
px1 py1 for lower left corner
and
px2 py2 for upper right corner.
Thus
plots in the lower right
quadrant of the display;
uses the whole display but
inverts the
y coordinates.

sa 
Save the current environment, and move to a new one.
The new environment inherits the old one.
There are 7 levels.

re 
Restore previous environment.


SEE ALSO
plot(1),
graph(1)
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