-.TH XScreenSaver 1 "22-mar-93" "X Version 11"
+.de EX \"Begin example
+.ne 5
+.if n .sp 1
+.if t .sp .5
+.nf
+.in +.5i
+..
+.de EE
+.fi
+.in -.5i
+.if n .sp 1
+.if t .sp .5
+..
+.TH XScreenSaver 1 "14-Jun-97" "X Version 11"
.SH NAME
attraction - interactions of opposing forces
.SH SYNOPSIS
.B attraction
-[\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-points \fIint\fP] [\-threshold \fIint\fP] [\-mode balls | lines | polygons | splines | filled-splines | tails ] [\-color-mode cycle | random] [\-size \fIint\fP] [\-segments \fIint\fP] [\-delay \fIusecs\fP] [\-color-shift \fIdegrees\fP] [\-radius \fIint\fP] [\-vx \fIint\fP] [\-vy \fIint\fP] [\-glow] [\-noglow] [\-orbit]
+[\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-points \fIint\fP] [\-threshold \fIint\fP] [\-mode balls | lines | polygons | splines | filled-splines | tails ] [\-size \fIint\fP] [\-segments \fIint\fP] [\-delay \fIusecs\fP] [\-color-shift \fIint\fP] [\-radius \fIint\fP] [\-vx \fIint\fP] [\-vy \fIint\fP] [\-glow] [\-noglow] [\-orbit] [\-viscosity \fIfloat\fP] [\-mouse] [\-no-mouse] [\-mouse-size]
.SH DESCRIPTION
The \fIattraction\fP program has several visually different modes of
operation, all of which are based on the interactions of a set of control
.B \-mono
If on a color display, pretend we're on a monochrome display.
.TP 8
+.B \-install
+Install a private colormap for the window.
+.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 \-points integer
How many control points should be used, or 0 to select the number randomly.
Default 0. Between 3 and 15 works best.
by a worm-like trail, whose length is controlled by the \fIsegments\fP
parameter.
.TP 8
-.B \-color-mode cycle | random
-Whether colors should cycle through the spectrum, or be picked randomly.
-.TP 8
.B \-size integer
The size of the balls in pixels, or 0, meaning to select the sizes
randomly (the default.) If this is specified, then all balls will be
How much of a delay should be introduced between steps of the animation.
Default 10000, or about 0.01 seconds.
.TP 8
-.B \-color-shift degrees
+.B \-color-shift int
If on a color display, the color of the line segments or polygons will
-cycle through the spectrum. This specifies how far the hue of each segment
-should be from the next, in degrees on the HSV wheel. Default 3.
+cycle through the color map. This specifies how many lines will be drawn
+before a new color is chosen. (When a small number of colors are available,
+increasing this value will yield smoother transitions.) Default 3.
This has no effect in \fIballs\fP mode.
.TP 8
.B \-radius
.B \-vmult float
In orbit mode, the initial velocity of the balls is multiplied by this;
a number less than 1 will make the balls pull closer together, and a larger
-number will make them move apart. The default is 1, meaning stability.
+number will make them move apart. The default is 0.9, meaning a slight
+inward pull.
+.TP 8
+.B \-viscosity float
+This sets the viscosity of the hypothetical fluid through which the control
+points move; the default is 1, meaning no resistance. Values higher than 1
+aren't interesting; lower values cause less motion.
+
+One interesting thing to try is
+.EX
+attraction -viscosity 0.8 -points 75 \\
+ -mouse -geometry =500x500
+.EE
+Give it a few seconds to settle down into a stable clump, and then move
+the mouse through it to make "waves".
+.TP 8
+.B \-mouse
+This will cause the mouse to be considered a control point; it will not be
+drawn, but it will influence the other points, so you can wave the mouse
+and influence the images being created.
+.TP 8
+.B \-no-mouse
+Turns off \fB\-mouse\fP.
+.TP 8
+.B \-mouse-size integer
+In \fB\-mouse\fP mode, this sets the mass of the mouse (analagously to the
+\fB\-size\fP parameter.)
.SH ENVIRONMENT
.PP
.TP 8
.BR X (1),
.BR xscreensaver (1)
.SH COPYRIGHT
-Copyright \(co 1992, 1993 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.
+Copyright \(co 1992, 1993, 1997 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 <jwz@lucid.com>, 13-aug-92.
+Jamie Zawinski <jwz@jwz.org>, 13-aug-92.
+
+Viscosity and mouse support by Philip Edward Cutone, III.
projects / xscreensaver / blobdiff