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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 ...line, line,
li 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 \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).
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move 4.5 6.77
vec 5.8, 5.6 7.8
4.55 10.0, 3.6 4.5, 6.77
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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 6i).
cl Close plotting device.
Basic Plotting Commands
e Start another frame of output.
m x y (move) Current point becomes x y.
rm dx dyCurrent 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 dyDraw vector from current point to X+dx Y+dy
li x1 y1 x2 y2
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Draw a line from x1 y1 to x2 y2. Make the current point x2 y2.
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t string Place the string so that its first character is centered
on the current point (default). If string begins with \C (\R),
it is centered (right-adjusted) 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
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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.
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ci xc yc rDraw 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 rDraw a disc centered at xc yc with radius r using the
filling color (see cfill below).
bo x1 y1 x2 y2
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Draw a box with lower left corner at x1 y1 and upper right corner
at x2 y2.
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sb x1 y1 x2 y2
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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).
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par x1 y1 x2 y2 xg yg
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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.
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pol { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
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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.
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fi { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
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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.
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sp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
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Draw a parabolic spline guided by x1 y1 ... xn yn with simple
endpoints.
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fsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
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Draw a parabolic spline guided by x1 y1 ... xn yn with double
first endpoint.
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lsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
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Draw a parabolic spline guided by x1 y1 ... xn yn with double
last endpoint.
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dsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
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Draw a parabolic spline guided by x1 y1 ... xn yn with double
endpoints.
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csp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
in filename
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(include) Take commands from filename.
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de string { commands }
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Define string as commands.
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ca string scale
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Invoke commands defined as string applying scale to all coordinates.
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Commands Controlling the Environment
co stringUse 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 32-bit number
specifying 8 bit each of red, green, blue, and alpha. For example,
0xFFFF00FF denotes solid yellow.
pe stringUse string as the style for drawing lines. The available
pen styles are: solid, dott[ed], short, long, dotd[ashed], cdash,
ddash
cf stringColor for filling (see co, above).
ra x1 y1 x2 y2
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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.
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fr px1 py1 px2 py2
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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 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.
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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.
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