NAME
xtide - Harmonic tide clock and tide predictor (interactive client)
SYNOPSIS
xtide [-aa y|n] [-b ‘‘YYYY-MM-DD HH:MM’’] [-bc color] [-bg color] [-cb
y|n] [-cw pixels] [-dc color] [-Dc color] [-df ‘‘format-string’’]
[-display ‘‘X display’’] [-ec color] [-el y|n] [-em pSsMm] [-fc color]
[-fe y|n] [-fg color] [-fn font] [-ga aspect] [-geometry
‘‘±XOFF±YOFF’’] [-gh pixels] [-gl longitude] [-gt y|n] [-gw pixels]
[-hf ‘‘format-string’’] [-in y|n] [-l ‘‘location name’’] [-lw pixels]
[-m a|g|k|m|p|r] [-mc color] [-Mc color] [-nc color] [-nf y|n] [-tf
‘‘format-string’’] [-tl y|n] [-u ft|m] [-v] [-z y|n]
DESCRIPTION
XTide is a package that provides tide and current predictions in a wide
variety of formats. Graphs, text listings, and calendars can be
generated, or a tide clock can be provided on your desktop.
XTide can work with X-windows, plain text terminals, or the web. This
is accomplished with three separate programs: the interactive interface
(xtide), the non-interactive or command line interface (tide), and the
web interface (xttpd).
xtide is the interactive X-windows client for XTide 2. Although in
reality it accepts many command line options, you should not need to
use them; everything can be done interactively. Just run xtide and
point and click your way to whatever you need. If you get stuck, click
on a ‘?’ button for on-line help.
For a complete discussion of the command line options and a detailed
explanation of the interactive interface, please see the verbose
documentation at http://www.flaterco.com/xtide/.
CONFIGURATION
Unless a configuration file /etc/xtide.conf is supplied, you must set
the environment variable HFILE_PATH to point to the harmonics files
that should have been installed along with the xtide program. Example:
export HFILE_PATH=/usr/local/share/xtide/harmonics.tcd
If a configuration file is used, the first line should consist of the
colon-separated list of harmonics files (e.g. the HFILE_PATH line above
without the "export HFILE_PATH=" part). The environment variable takes
precedence over the configuration file. Also, note that on Debian
systems the tidal harmonics data file are stored in /usr/share/xtide
instead of /usr/local/share/xtide as used above.
If the optional World Vector Shoreline files have been installed, the
path to those files can be supplied in the WVS_DIR environment variable
or as the second line of the configuration file.
Set the environment variable XTIDE_DEFAULT_LOCATION to the name of your
favorite place if you want to skip the location-choosing step.
OPTIONS
-aa y|n
Select whether or not to anti-alias tide graphs on true color
displays (default y). Turning this off can greatly improve
performance on CPU-bound systems.
-b ‘‘YYYY-MM-DD HH:MM’’
Specify the begin (start) time for predictions using the ISO
8601 compliant format YYYY-MM-DD HH:MM, where hours range from
00 to 23. The timestamp is in the local time zone for the
location, or in UTC if the -z setting is engaged. If clock mode
is selected or if no -b is supplied, the current time will be
used.
-bc color
Background color of buttons (default gray80).
-bg color
Background color for text windows and location chooser (default
white).
-cb y|n
Select whether or not tide clocks should be created with buttons
(default n).
-cw pixels
Initial width for tide clocks (default 84 pixels). Note:
Initial clock height is the same as initial graph height.
-dc color
Daytime background color in tide graphs (default SkyBlue).
-Dc color
Color of datum line in tide graphs (default white).
-df ‘‘format-string’’
strftime(3) style format string for printing dates (default
%Y-%m-%d).
-display ‘‘X display’’
Specify the X display, e.g. "quake:0.0". This overrides the
DISPLAY environment variable.
-ec color
Foreground in tide graphs during outgoing tide (default
SeaGreen).
-el y|n
Select whether or not to draw datum and middle-level lines in
tide graphs (default n).
-em pSsMm
Events to suppress (p = phase of moon, S = sunrise, s = sunset,
M = moonrise, m = moonset), or x to suppress none. E.g, to
suppress all sun and moon events, set eventmask to the value
pSsMm.
-fc color
Foreground in tide graphs during incoming tide (default Blue).
-fe y|n
Select whether or not to prefer flat map to round globe location
chooser (default n).
-fg color
Color of text and other notations (default black).
-fn font
Font used for button labels and verbiage in text windows
(default as incoming from X11). The font used in graphs and
clocks cannot be changed.
-ga aspect
Initial aspect for tide graphs and clocks (default 1.0). This
controls not the width or height of the window but rather the
relative scaling of the X and Y axes in the plot of the tide
curve.
-geometry ‘‘±XOFF±YOFF’’
Specify a position for the window corresponding to the first use
of -l. (Width and height are controlled by different settings.)
-gh pixels
Initial height for tide graphs and clocks (default 312 pixels).
-gl longitude
Initial center longitude for location chooser. Valid values are
-180 -150 -120 -90 -60 -30 0 30 60 90 120 150 and 360. 360 (the
default) will pick the longitude with the most tide stations.
-gt y|n
Select whether or not to label tenths of units in tide graphs
(default n).
-gw pixels
Initial width for tide graphs (default 960 pixels).
-hf ‘‘format-string’’
strftime(3) style format string for printing hour labels on time
axis (default %l).
-in y|n
Select whether or not to use inferred values for some
constituents (default n). For expert use only.
-l ‘‘location name’’
Specify a location for tide predictions. When given to the
interactive client, this causes it to start a tide clock for the
specified location instead of launching a location chooser on
startup. This is useful for starting a tide clock automatically
when you log on. Multiple uses of -l will result in multiple
tide clocks.
-lw pixels
Width for lines in tide graphs with -nf (default 2.5 pixels).
-m a|g|k|m|p|r
Specify mode to be about, graph, clock, medium rare, plain, or
raw. The default is clock.
-mc color
Color of mark line in graphs and of location dots on the
spinning globe (default red).
-Mc color
Color of middle-level line in tide graphs (default yellow).
-nc color
Nighttime background color in tide graphs (default DeepSkyBlue).
-nf y|n
Select whether or not to draw tide graphs as line graphs
(default n).
-tf ‘‘format-string’’
strftime(3) style format string for printing times (default
%l:%M %p %Z).
-tl y|n
Select whether or not to draw depth lines on top of the tide
graph (default n).
-u ft|m
Preferred units of length (default no preference).
-v Print version string and exit.
-z y|n Select whether or not to coerce all time zones to UTC (default
n).
SEE ALSO
tide(1), xttpd(8), http://www.flaterco.com/xtide/.