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+.TH XScreenSaver 1 "9-oct-2002" "X Version 11"
+.SH NAME
+halftone - simple halftone pattern of moving mass points
+.SH SYNOPSIS
+.B halftone
+[\-display \fIhost:display.screen\fP]
+[\-visual \fIvisual\fP]
+[\-window]
+[\-root]
+[\-count \fInumber\fP]
+[\-spacing \fInumber\fP]
+[\-sizefactor \fInumber\fP]
+[\-delay \fInumber\fP]
+[\-minmass \fInumber\fP]
+[\-maxmass \fInumber\fP]
+[\-minspeed \fInumber\fP]
+[\-maxspeed \fInumber\fP]
+[\-fps]
+.SH DESCRIPTION
+Draws the gravity force in each point on the screen seen through a
+halftone dot pattern. The gravity force is calculated from a set of
+moving mass points. View it from a distance for best effect.
+.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 \-count \fInumber\fP
+How many mass points to move around. Default: 10
+.TP 8
+.B \-spacing \fInumber\fP
+Distance between each halftone dot. Default: 14
+.TP 8
+.B \-sizefactor \fInumber\fP
+How big each halftone dot should be drawn compared to the spacing value. Default: 1.5
+.TP 8
+.B \-minmass \fInumber\fP
+The minimum mass of each mass point. Default: 0.001
+.TP 8
+.B \-maxmass \fInumber\fP
+The maximum mass of each mass point. Default: 0.02
+.TP 8
+.B \-minspeed \fInumber\fP
+The minimum speed of each mass point. Default: 0.001
+.TP 8
+.B \-maxspeed \fInumber\fP
+The maximum speed of each mass point. Default: 0.02
+.B \-delay \fInumber\fP
+Per-frame delay, in microseconds.  Default: 10000
+.TP 8
+.B \-fps
+Display the current frame rate and CPU load.
+.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 2002 by Peter Jaric. 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
+Peter Jaric
+