Direct graphical output to an X11 graphics device.
The X Window System is a computer independent protocol developed at
MIT for supporting windowing and graphics applications in a
networked environment. X is emerging as an industry standard and
is now supported by most workstation vendors. The X11 driver has
been successfully implemented on Release 3, Release 4, Release 5
and Release 6 of X11.
Dataplot must be linked with the proper X11 libraries in order for
the X11 driver to work. If this is not the case, contact your
local Dataplot installer.
A powerful feature of X is the ability to work in a networked
environment. Dataplot can use X11 in one of two ways:
- Dataplot is installed on a local workstation (e.g., a SUN).
In this case, simply enter the DEVICE 1 X11 command to open a
graphics window. This assumes that X11 is installed on your
local workstation. Check with your system administrator if
you are not sure.
- Dataplot is installed on a remote host and the graphics will
be generated on a local workstation or X11 terminal. Two
typical configurations are a workstation running Dataplot
from a mainframe or a group of workstations linked in a common
network with Dataplot installed on one of these workstations.
In this case, X11 must be installed on both the remote host
and the local host and the following steps are required:
The xhost command gives the remote host permission to write
to your display. The setenv command identifies the specific
workstation the remote host should generate the graphics on.
Non-Unix hosts may have a different command than setenv.
The dataplot command can be executed from any currently open X11
window. Dataplot's alphanumeric input and output, such as entering
commands and the printing of FIT results, occurs in this window.
Dataplot makes no effort to determine or manipulate the attributes
of the alphanumeric window. When the DEVICE 1 X11 command is
entered, a separate graphics window is opened. Both the
alphanumeric and graphics windows can be controlled (i.e., moved,
resized, exposed) with standard window manager menu options. In
addition, the Dataplot commands PICTURE POINTS and ORIENTATION can
control the size and shape of the graphics window. If the window
is resized, the new dimensions do not take effect until the next
screen erase is performed (this can be forced with a Dataplot
erase command). Until the screen erase is done, graphics may
either be clipped or only use a part of the available window.
In X11, the window manager is simply another application program.
This means that different implementations of X11 can use different
window managers. There may be minor differences in how the
Dataplot graphics window interacts with different window managers.
However, Dataplot is written using the lowest layer of the X11
libraries (xlib), so it should be compatible with any of the window
managers. The popular OpenLook (from Sun and AT&T) and Motif
(most other vendors) window systems are X11 based and the X11
driver works with them.
X11 supports graphical user interfaces. However, Dataplot simply
supports X11 as a graphics device driver.
Several SET commands were added to support X11 specific features.
- SET X11 NAME <display name>:
Normally, X11 sends the graphics to the default display (for
Unix systems, this is the "setenv DISPLAY" variable). This SET
command is used to override the default display name. On Unix
systems, this command is the equivalent to doing the Unix
command "setenv DISPLAY <name> The name is given in one
of the following 2 formats:
SET X11 NAME dogwood.cam.nist.gov:0
SET X11 NAME 220.127.116.11:0
The numeric address should always be recognized. The name (and
any abbreviations of the name) depend on the host tables on the
- SET X11 PIXMAP <ON/OFF>
If all or part of the Dataplot graphics window is covered and
then re-exposed, the current graph is not automatically
redrawn. If the PIXMAP variable is turned on, graphs are
written to a pixmap in the background as well as to the screen.
If part of the current graph is lost, the pixmap is copied to
the screen to restore the current graph (the updating does not
occur until the next command is entered). This option is
- SET X11 FONT <font name>
The X11 font name can be up to 80 characters long. The
following are terminal emulator fonts that should be available
on most X11 systems.
In addition, most X11 implementations provide a large number of
additional fonts. The complete list available on a given
implementation can be retrieved with the "xlsfont" command.
Since the list of fonts varies with the implementation,
Dataplot provides no abbreviations of the font names (which
tend to be long).
- SET X11 CAP <BUTT/ROUND/PROJECT/NOTLAST>
SET X11 JOIN <MITER/ROUND/BEVEL>
The cap style determines how the end of lines are drawn
(referred to as end-caps). For BUTT, the end-caps are squared
off at end-points perpindicular to the slope of the line. The
NOTLAST option is equivalent to BUTT for wide lines. For one
pixel wide lines, the last point is not drawn. The ROUND option
draws the end-cap as a circle with diameter equal to the line
width. The PROJECT option draws a squared off end-cap, but it
projects half the line-width beyond the endpoints. The join
style controls how intermediate points of a polyline are
connected (only if the line is more than one pixel wide). The
MITER option extends the outer edges so that they meet at the
same angle as would narrow lines. The ROUND option rounds off
corners using a circle with diameter equal to the line width
centered at the join point. The BEVEL option joins the lines
as if they both had BUTT end-caps. In most cases, the cap and
join style can simply be defaulted (BUTT and MITER
respectively). The other choices are aesthetic preferences.
Occasionally, curves that meet at sharp angles can produce
spikes, in which case specifying a join style of ROUND or BEVEL
should solve the problem.
- SET X11 PAUSE <ON/OFF>
If this switch is ON, when a screen erase is performed on the
X11 graphics window the user will be prompted to enter a
This switch is OFF by default.
Note: This command is currently de-activated.
- SET X11 WINDOW ID <string>
This command is used by the Tcl/Tk Graphical User Interface
(GUI) when the GUI screen graphics are generated to an X11
window (rather than using the Tcl/Tk driver). This command is
typically not entered by the user. If the user enters this
command manually, it will probably result in the graphics not
being displayed on the X11 window of the GUI.
Dataplot automatically determines if the X11 device is color. The
X11 driver supports the full range of colors available with
Dataplot (about 88 colors and 100 levels of gray scale). Enter
HELP COLOR for a list of available colors.
- HARDWARE TEXT - A large number of hardware fonts are available
(use the SET X11 FONT command). The 6x12 font is the default.
A given font has a fixed size and rotation, so the only way to
change the character size is to change the font.
- COLOR - X11 devices vary in their support of color (from
monochrome to full 24-bit color). For color workstations,
Dataplot will try to assign all 88 colors. Colors that are
not available on the device are set to black (or white for
black backgrounds). Gray scale is supported if the device
itself supports it.
- HARDWARE FILL - Solid area fills are done in hardware.
- DASH PATTERNS - The following dash patterns are available:
DASH - 6 pixels on, 3 pixels off;
DOT - 1 pixel on, 2 pixels off;
DASH2 - 9 pixels on, 3 pixels off, 3 pixels
on, 3 pixels off;
DASH3 - 3 pixels on, 3 pixels off;
DASH4 - 2 pixels on, 4 pixels off.
- LINE WIDTH - Thick lines are generated in hardware.
- GRAPHICS INPUT - The CROSS-HAIR command is supported for this
Direct graphical output to a Postscript device.
Direct graphical output to an HPGL device.
Direct graphical output to a Tektronix device.
Specify certain actions for the graphics output.
DEVICE 1 X11
PLOT X**2 FOR X = 1 1 9
NIST is an agency of the U.S.
Date created: 06/09/2016
Last updated: 06/09/2016
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