From http://www.jwz.org/xscreensaver/xscreensaver-5.33.tar.gz

[xscreensaver] / hacks / glx / splitflap.man

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+.TH XScreenSaver 1 "" "X Version 11"
+.SH NAME
+splitflap - a simulation of a split-flap electromechanical display.
+.SH SYNOPSIS
+.B splitflap
+[\-display \fIhost:display.screen\fP]
+[\-visual \fIvisual\fP]
+[\-window]
+[\-root]
+[\-delay \fImicroseconds\fP]
+[\-speed \fIfloat\fP]
+[\-width \fIcolumns\fP]
+[\-height \fIrows\fP]
+[\-mode text | clock12 | clock24]
+[\-no-wander]
+[\-spin \fIaxes\fP]
+[\-no\-spin]
+[\-front] [\-no-front]
+[\-wireframe]
+[\-fps]
+.SH DESCRIPTION
+Simulates a split-flap display, an old style of electromechanical sign as
+seen in airports and train stations, and commonly used in alarm clocks in
+the 1960s and 1970s.  
+.SH OPTIONS
+.TP 8
+.B \-visual \fIvisual\fP
+Specify which visual to use.  Legal values are the name of a visual class,
+or the id number (decimal or hex) of a specific visual.
+.TP 8
+.B \-window
+Draw on a newly-created window.  This is the default.
+.TP 8
+.B \-root
+Draw on the root window.
+.TP 8
+.B \-delay \fInumber\fP
+Per-frame delay, in microseconds.  Default: 20000 (0.02 seconds).
+.TP 8
+.B \-speed \fInumber\fP
+Animation speed.  2.0 means twice as fast, 0.5 means half as fast.
+.TP 8
+.B \-width \fInumber\fP
+Columns of the display.  Default: 22.
+.TP 8
+.B \-height \fInumber\fP
+Rows of the display. Default: 8.
+.TP 8
+.B \-mode clock12
+Display a 12-hour clock.
+.TP 8
+.B \-mode clock24
+Display a 24-hour clock.
+.TP 8
+.B \-front | \-no-front
+When spinning, never spin all the way around or upside down:
+always face mostly forward so that the text is easily readable.
+This is the default.
+.TP 8
+.B \-no\-front
+Allow spins to go all the way around or upside down.
+.TP 8
+.B \-wander | \-no-wander
+Whether the object should wander around the screen.
+.TP 8
+.B \-spin
+Which axes around which the text should spin.  The default is "XYZ",
+meaning rotate it freely in space.  "\fB\-spin Z\fP" would rotate the
+text in the plane of the screen while not rotating it into or out
+of the screen; etc.
+.TP 8
+.B \-wireframe | \-no-wireframe
+Render in wireframe instead of solid.
+.TP 8
+.B \-fps | \-no-fps
+Whether to show a frames-per-second display at the bottom of the screen.
+.SH ENVIRONMENT
+.PP
+.TP 8
+.B DISPLAY
+to get the default host and display number.
+.TP 8
+.B XENVIRONMENT
+to get the name of a resource file that overrides the global resources
+stored in the RESOURCE_MANAGER property.
+.SH SEE ALSO
+.BR X (1),
+.BR xscreensaver (1)
+.SH COPYRIGHT
+Copyright \(co 2015 by Jamie Zawinski.  Permission to use, copy, modify, 
+distribute, and sell this software and its documentation for any purpose is 
+hereby granted without fee, provided that the above copyright notice appear 
+in all copies and that both that copyright notice and this permission notice
+appear in supporting documentation.  No representations are made about the 
+suitability of this software for any purpose.  It is provided "as is" without
+express or implied warranty.
+.SH AUTHOR
+Jamie Zawinski.