PLOT(1) GNU Plotting Utilities PLOT(1)NAMEplot - translate GNU metafiles to other graphics formats
SYNOPSISplot [ options ] [ files ]
DESCRIPTIONplot translates files in GNU metafile format to other
graphics formats, or displays them on an X Window System
display. GNU metafile format is a device-independent for
mat for the storage of graphic data. It is the default
output format of the programs graph(1), pic2plot(1),
tek2plot(1), and plotfont(1), and is further documented in
plot(5), since it is an enhanced version of the tradi
tional plot(5) format found on non-GNU systems. It can
also be produced by the GNU libplot 2-D graphics export
library (see plot(3)).
The output format or display type is specified with the -T
option. The possible output formats and display types are
the same as those supported by graph(1), plotfont(1),
pic2plot(1), and tek2plot(1). If an output file is pro
duced, it is written to standard output.
Options and file names may be interspersed on the command
line, but the options are processed before the file names
are read. If -- is seen, it is interpreted as the end of
the options. If no file names are specified, or the file
name - is encountered, the standard input is read.
OPTIONS
General Options
-T type
--display-type type
Select type as the output format or display type.
It may be "X", "png", "pnm", "gif", "svg", "ai",
"ps", "cgm", "fig", "pcl", "hpgl", "regis", "tek",
or "meta" (the default). These refer respectively
to the X Window System, PNG (Portable Network
Graphics) format, portable anymap format
(PBM/PGM/PPM), a pseudo-GIF format that does not
use LZW encoding, the new XML-based Scalable Vector
Graphics format, the format used by Adobe Illustra
tor, Postscript or Encapsulated Postscript (EPS)
that can be edited with idraw(1), CGM format (by
default, confirming to the WebCGM profile), the
format used by the xfig(1) drawing editor, the
Hewlett-Packard PCL 5 printer language, the
Hewlett-Packard Graphics Language, ReGIS graphics
format (which can be displayed by the dxterm(1)
terminal emulator or by a VT330 or VT340 terminal),
Tektronix format (which can be displayed by the
xterm(1) terminal emulator), and device-independent
GNU metafile format itself. Unless type is "X", an
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output file is produced and written to standard
output.
Omitting the -T option is equivalent to specifying
-T meta. Translating from metafile format to
itself is occasionally useful, since there are two
versions of metafile format (see the -O option
below).
A listing of the fonts available in any specified
output format may be obtained with the --help-fonts
option (see below). If a requested font is
unavailable, a default font will be substituted.
The default font is "Helvetica" for "X", "svg",
"ai", "ps", "cgm", and "fig", "Univers" for "pcl",
and "HersheySerif" for "png", "pnm", "gif", "hpgl",
"regis", "tek", and "meta".
-p n
--page-number n
Output only page number n, within the metafile or
sequence of metafiles that is being translated.
Metafiles may consist of one or more pages, num
bered beginning with 1. Also, each page may con
tain multiple `frames'. plot-T X, plot-T regis,
and plot-T tek, which plot in real time, will sep
arate successive frames by screen erasures. plot-T png, plot-T pnm, plot-T gif, plot-T svg, plot-T ai, plot-T ps, plot-T cgm, plot-T fig, plot-T pcl, and plot-T hpgl, which do not plot in real
time, will output only the last frame of any multi-
frame page.
The default behavior, if -p is not used, is to out
put all pages. For example, plot-T X displays
each page in its own X window. If the -T png, -T
pnm, -T gif, -T ai, or -T fig option is used, the
default behavior is to output only the first
nonempty page, since files in those output formats
contain only a single page of graphics.
Metafiles produced by graph(1) and plotfont(1) con
tain only a single page (page #1), which consists
of two frames: an empty frame to clear the display,
and a second frame that contains the graphics.
-s
--merge-pages
Merge all displayed pages into a single page, and
also merge all `frames'.
This option is useful when merging together single-
page plots from different sources. For example, it
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can be used to merge together plots obtained from
separate invocations of graph(1).
--bitmap-size bitmap_size
Set the size of the graphics display in which the
plot will be drawn, in terms of pixels, to be
bitmap_size. The default is "570x570". This is
relevant only to plot-T X, plot-T png, plot-T
pnm, and plot-T gif, all of which produce bitmaps.
If you choose a rectangular (non-square) window
size, the fonts in the plot will be scaled
anisotropically, i.e., by different factors in the
horizontal and vertical directions. For plot-T X,
this requires an X11R6 display. Any font that can
not be scaled in this way will be replaced by a
default scalable font, such as the vector font
"HersheySerif".
The environment variable BITMAPSIZE can equally
well be used to specify the window size. For back
ward compatibility, the X resource Xplot.geometry
may be used instead.
--emulate-color option
If option is yes, replace each color in the output
by an appropriate shade of gray. This is seldom
useful, except when using plot-T pcl to prepare
output for a PCL 5 device. (Many monochrome PCL 5
devices, such as monochrome LaserJets, do a poor
job of emulating color on their own.) You may
equally well request color emulation by setting the
environment variable EMULATE_COLOR to "yes".
--max-line-length max_line_length
Set the maximum number of points that a polygonal
line may contain, before it is flushed out, to be
max_line_length. If this flushing occurs, the
polygonal line will be split into two or more sub-
lines, though the splitting should not be notice
able. The default value of max_line_length is 500.
The reason for splitting long polygonal lines is
that some display devices (e.g., old Postscript
printers and pen HP-GL plotters) have limited
buffer sizes. The environment variable
MAX_LINE_LENGTH can also be used to specify the
maximum line length.
--page-size pagesize
Set the size of the page on which the plot will be
positioned. This is relevant only to plot-T svg,
plot-T ai, plot-T ps, plot-T cgm, plot-T fig,
plot-T pcl, and plot-T hpgl. The default is
"letter", which means an 8.5 inch by 11 inch page.
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Any ISO page size in the range "a0"..."a4" or ANSI
page size in the range "a"..."e" may be specified
("letter" is an alias for "a" and "tabloid" is an
alias for "b"). "legal" and "ledger" are recog
nized page sizes also. The environment variable
PAGESIZE can equally well be used to specify the
page size.
The graphics display in which the plot is drawn
will, by default, be a square region that occupies
nearly the full width of the specified page. An
alternative size for the graphics display can be
specified. For example, the page size could be
specified as "letter,xsize=4in,ysize=6in", or
"a4,xsize=5.0cm,ysize=100mm". For all of the above
except plot-T hpgl, the graphics display will, by
default, be centered on the page. For all of the
above except plot-T svg and plot-T cgm, the
graphics display may be repositioned manually, by
specifying the location of its lower left corner,
relative to the lower left corner of the page. For
example, the page size could be specified as "let
ter,xorigin=2in,yorigin=3in", or "a4,xori
gin=0.5cm,yorigin=0.5cm". It is also possible to
specify an offset vector. For example, the page
size could be specified as "letter,xoffset=1in", or
"letter,xoffset=1in,yoffset=1.2in", or "a4,yoff
set=-1cm". In SVG format and WebCGM format it is
possible to specify the size of the graphics dis
play, but not its position.
--rotation angle
Rotate the graphics display by angle degrees. Rec
ognized values are "0", "90", "180", and "270".
"no" and "yes" are equivalent to "0" and "90",
respectively. The environment variable ROTATION
can also be used to specify a rotation angle.
Parameter Initialization Options
The following options set the initial values of drawing
parameters. However, all of these may be overridden by
directives in a metafile. In fact, these options are use
ful primarily when plotting old metafiles in the tradi
tional (pre-GNU) plot(5) format, which did not support
such directives.
--bg-color name
Set the color initially used for the background to
be name. This is relevant only to plot-T X, plot-T png, plot-T pnm, plot-T gif, plot-T svg, plot-T cgm, and plot-T regis. An unrecognized name
sets the color to the default, which is "white".
The environment variable BG_COLOR can equally well
be used to specify the background color.
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If the -T png or -T gif option is used, a transpar
ent PNG file or a transparent pseudo-GIF, respec
tively, may be produced by setting the TRANSPAR
ENT_COLOR environment variable to the name of the
background color. If the -T svg or -T cgm option
is used, an output file without a background may be
produced by setting the background color to "none".
-f size
--font-size size
Set the size of the font initially used for render
ing text, as a fraction of the width of the graph
ics display, to be size. The default is 0.0525.
-F name
--font-name name
Set the font initially used for text to be name.
Font names are case-insensitive. If the specified
font is not available, the default font will be
used. Which fonts are available, and the default
font, depend on which -T option is specified (see
above). A list of available fonts can be obtained
with the --help-fonts option (see below).
-W line_width
--line-width line_width
Set the initial width of lines, as a fraction of
the width of the display, to be line_width. A neg
ative value means that a default value should be
used. This value is format-dependent. The inter
pretation of zero line width is also format-depen
dent (in some output formats, a zero-width line is
the thinnest line that can be drawn; in others, a
zero-width line is invisible).
--pen-color name
Set the initial pen color to be name. An unrecog
nized name sets the pen color to the default, which
is "black".
Options for Metafile Output
The following option is relevant only if the -T option is
omitted or if -T meta is used. In this case the output of
plot, like the input, will be in GNU graphics metafile
format.
-O
--portable-output
Output the portable (human-readable) version of GNU
metafile format, rather than the binary version
(the default). The format of the binary version is
machine-dependent.
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Options for Backward Compatibility
By default, plot assumes that its input file(s) are in
either the binary version or the portable version of GNU
metafile format. You may specify that the input is,
instead, in the traditional Unix (pre-GNU) graphics
metafile format, which is documented in plot(5). The tra
ditional graphics metafile format was produced by pre-GNU
versions of graph(1).
-h
--high-byte-first-input
Input file(s) are assumed to be in the binary,
`high byte first' version of traditional metafile
format. This variant is uncommon.
-l
--low-byte-first-input
Input file(s) are assumed to be in the binary, `low
byte first' version of traditional metafile format.
This variant is the most common.
-A
--ascii-input
Input file(s) are assumed to be in the ASCII
(human-readable) variant of traditional metafile
format. On some older Unix systems, this variant
was produced by plottoa(1).
Informational Options
--help Print a list of command-line options, and exit.
--help-fonts
Print a table of available fonts, and exit. The
table will depend on which output format or display
type is specified with the -T option. plot-T X,
plot-T svg, plot-T ai, plot-T ps, plot-T cgm,
and plot-T fig each support the 35 standard
Postscript fonts. plot-T svg, plot-T pcl, and
plot-T hpgl support the 45 standard PCL 5 fonts,
and the latter two support a number of
Hewlett-Packard vector fonts. All seven support a
set of 22 Hershey vector fonts, as do plot-T png,
plot-T pnm, plot-T gif, plot-T regis, and plot-T tek. plot without a -T option in principle sup
ports any of these fonts, since its output must be
translated to other formats by a further invocation
of plot.
The plotfont(1) utility may be used to obtain a
character map of any supported font.
--list-fonts
Like --help-fonts, but lists the fonts in a single
column to facilitate piping to other programs. If
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no output format is specified with the -T option,
the full set of supported fonts is listed.
--version
Print the version number of plot and the plotting
utilities package, and exit.
ENVIRONMENT
The environment variables BITMAPSIZE, PAGESIZE, BG_COLOR,
EMULATE_COLOR, MAX_LINE_LENGTH and ROTATION serve as back
ups for the options --bitmap-size, --page-size,
--bg-color, --emulate-color, --max-line-length, and
--rotation, respectively. The remaining environment vari
ables are specific to individual output formats.
plot-T X, which pops up a window on an X Window System
display and draws graphics in it, checks the DISPLAY envi
ronment variable. Its value determines the display that
will be used.
plot-T png and plot-T gif, which produce output in PNG
format and pseudo-GIF format respectively, are affected by
the INTERLACE environment variable. If its value is
"yes", the output will be interlaced. Also, if the TRANS
PARENT_COLOR environment variable is set to the name of a
color, that color will be treated as transparent in the
output.
plot-T pnm, which produces output in portable anymap
(PBM/PGM/PPM) format, is affected by the PNM_PORTABLE
environment variable. If its value is "yes", the output
will be in a human-readable format rather than binary (the
default).
plot-T cgm, which produces output in CGM (Computer Graph
ics Metafile) format, is affected by the CGM_MAX_VERSION
and CGM_ENCODING environment variables. By default, it
produces a binary-encoded version of CGM version 3 format.
For backward compatibility, the version number may be
reduced by setting CGM_MAX_VERSION to "2" or "1". Irre
spective of version, the output CGM file will use the
human-readable clear text encoding if CGM_ENCODING is set
to "clear_text". However, only binary-encoded CGM files
conform to the WebCGM profile.
plot-T pcl, which produces PCL 5 output for
Hewlett-Packard printers and plotters, is affected by the
environment variable PCL_ASSIGN_COLORS. It should be set
to "yes" when producing PCL 5 output for a color printer
or other color device. This will ensure accurate color
reproduction by giving the output device complete freedom
in assigning colors, internally, to its "logical pens".
If it is "no" then the device will use a fixed set of col
ored pens, and will emulate other colors by shading. The
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default is "no" because monochrome PCL 5 devices, which
are much more common than colored ones, must use shading
to emulate color.
plot-T hpgl, which produces Hewlett-Packard Graphics Lan
guage output, is affected by several environment vari
ables. The most important is HPGL_VERSION, which may be
set to "1", "1.5", or "2" (the default). "1" means that
the output should be generic HP-GL, "1.5" means that the
output should be suitable for the HP7550A graphics plotter
and the HP758x, HP7595A and HP7596A drafting plotters (HP-
GL with some HP-GL/2 extensions), and "2" means that the
output should be modern HP-GL/2. If the version is "1" or
"1.5" then the only available fonts will be vector fonts,
and all lines will be drawn with a default width (the -W
option will not work). Additionally, if the version is
"1" then the filling of arbitrary curves with solid color
will not be supported (circles and rectangles aligned with
the coordinate axes may be filled, though).
The position of the plot-T hpgl graphics display on the
page can be rotated 90 degrees counterclockwise by setting
the HPGL_ROTATE environment variable to "yes". This is
not the same as the rotation obtained with the --rotation
option, since it both rotates the graphics display and
repositions its lower left corner toward another corner of
the page. Besides "no" and "yes", recognized values for
HPGL_ROTATE are "0", "90", "180", and "270". "no" and
"yes" are equivalent to "0" and "90", respectively. "180"
and "270" are supported only if HPGL_VERSION is "2" (the
default).
By default, plot-T hpgl will draw with a fixed set of
pens. Which pens are present may be specified by setting
the HPGL_PENS environment variable. If HPGL_VERSION is
"1", the default value of HPGL_PENS is "1=black"; if
HPGL_VERSION is "1.5" or "2", the default value of
HPGL_PENS is "1=black:2=red:3=green:4=yel
low:5=blue:6=magenta:7=cyan". The format should be self-
explanatory. By setting HPGL_PENS you may specify a color
for any pen in the range #1...#31. All color names recog
nized by the X Window System may be used. Pen #1 must
always be present, though it need not be black. Any other
pen in the range #1...#31 may be omitted.
If HPGL_VERSION is "2" then plot-T hpgl will also be
affected by the environment variable HPGL_ASSIGN_COLORS.
If its value is "yes", then plot-T hpgl will not be
restricted to the palette specified in HPGL_PENS: it will
assign colors to "logical pens" in the range #1...#31, as
needed. The default value is "no" because other than
color LaserJet printers and DesignJet plotters, not many
HP-GL/2 devices allow the assignment of colors to logical
pens.
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Opaque filling and the drawing of visible white lines are
supported only if HPGL_VERSION is "2" and the environment
variable HPGL_OPAQUE_MODE is "yes" (the default). If its
value is "no" then white lines (if any), which are nor
mally drawn with pen #0, will not be drawn. This feature
is to accommodate older HP-GL/2 devices. HP-GL/2 pen
plotters, for example, do not support opacity or the use
of pen #0 to draw visible white lines. Some older HP-GL/2
devices may, in fact, malfunction if asked to draw opaque
objects.
plot-T tek, which produces output for a Tektronix termi
nal or emulator, checks the TERM environment variable. If
the value of TERM is a string beginning with "xterm",
"nxterm", or "kterm", it is taken as a sign that plot is
running in an X Window System VT100 terminal emulator: a
copy of xterm(1), nxterm(1), or kterm(1). Before drawing
graphics, plot-T tek will emit an escape sequence that
causes the terminal emulator's auxiliary Tektronix window,
which is normally hidden, to pop up. After the graphics
are drawn, an escape sequence that returns control to the
original VT100 window will be emitted. The Tektronix win
dow will remain on the screen.
If the value of TERM is a string beginning with "kermit",
"ansi.sys", or "nansi.sys", it is taken as a sign that
plot is running in the VT100 terminal emulator provided by
the MS-DOS version of kermit(1). Before drawing graphics,
plot-T tek will emit an escape sequence that switches the
terminal emulator to Tektronix mode. Also, some of the
Tektronix control codes emitted by plot-T tek will be
kermit-specific. There will be a limited amount of color
support, which is not normally the case (the 16 `ansi.sys'
colors will be supported). After drawing graphics, plot-T tek will emit an escape sequence that returns the emu
lator to VT100 mode. The key sequence `ALT minus' can be
employed manually within kermit to switch between the two
modes.
SEE ALSOgraph(1), pic2plot(1), tek2plot(1), plotfont(1), plot(3),
plot(5), and "The GNU Plotting Utilities Manual".
AUTHORSplot was written by Robert S. Maier (rsm@math.ari
zona.edu).
BUGS
Email bug reports to bug-gnu-utils@gnu.org.
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