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       attraction - interactions of opposing forces

       attraction  [-display  host:display.screen] [-foreground color] [-back‐
       ground color] [-window] [-root]	[-mono]	 [-install]  [-visual  visual]
       [-points	 int]  [-threshold  int]  [-mode  balls	 |  lines | polygons |
       splines | filled-splines | tails ] [-size int] [-segments int]  [-delay
       usecs]  [-color-shift  int]  [-radius  int] [-vx int] [-vy int] [-glow]
       [-noglow] [-orbit] [-viscosity  float]  [-mouse]	 [-no-mouse]  [-mouse-

       The  attraction	program has several visually different modes of opera‐
       tion, all of which are based on the interactions of a  set  of  control
       points  which  attract  each  other  up to a certain distance, and then
       begin to repel each other.  The attraction/repulsion is proportional to
       the distance between any two particles.

       attraction accepts the following options:

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -mono   If on a color display, pretend we're on a monochrome display.

	       Install a private colormap for the window.

       -visual visual
	       Specify	which  visual  to use.	Legal values are the name of a
	       visual class, or the id number (decimal or hex) of  a  specific

       -points integer
	       How many control points should be used, or 0 to select the num‐
	       ber randomly.  Default 0.  Between 3 and 15 works best.

       -threshold integer
	       The distance (in	 pixels)  from	each  particle	at  which  the
	       attractive force becomes repulsive.  Default 100.

       -mode balls | lines | polygons | tails | splines | filled-splines
	       In  balls  mode	(the  default) the control points are drawn as
	       filled circles.	The larger the circle, the  more  massive  the

	       In  lines  mode,	 the  control points are connected by straight
	       lines; the effect is something like qix.

	       In polygons mode, the control points are connected by  straight
	       lines, and filled in.  This is most interesting in color.

	       In  splines mode, a closed spline is interpolated from the con‐
	       trol points.

	       In filled-splines mode, the splines are filled  in  instead  of
	       being outlines.	This is most interesting in color.

	       In  tails  mode,	 the path which each particle follows is indi‐
	       cated by a worm-like trail, whose length is controlled  by  the
	       segments parameter.

       -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 the same size.  This option has an effect in all
	       modes, since the ``size'' of the balls controls their mass.

       -segments integer
	       If in lines or polygons mode, how many sets of line segments or
	       polygons	 should	 be drawn. Default 100.	 This has no effect in
	       balls mode.  If segments is 0, then no segments	will  ever  be
	       erased (this is only useful in color.)

       -delay microseconds
	       How  much  of a delay should be introduced between steps of the
	       animation.  Default 10000, or about 0.01 seconds.

       -color-shift int
	       If on a color display, the color of the line segments or	 poly‐
	       gons will 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 balls mode.

       -radius The  size  in pixels of the circle on which the points are ini‐
	       tially positioned.  The default is slightly  smaller  than  the
	       size of the window.

       -glow   This  is	 consulted  only in balls mode.	 If this is specified,
	       then the saturation of the  colors  of  the  points  will  vary
	       according  to  their current acceleration.  This has the effect
	       that the balls flare brighter when they are  reacting  to  each
	       other most strongly.

	       In  glow mode, all of the balls will be drawn the same (random)
	       color, modulo the saturation shifts.   In  non-glow  mode,  the
	       balls will each be drawn in a random color that doesn't change.

       -noglow Don't do ``glowing.''  This is the default.

       -vx pixels

       -vy pixels
	       Initial	velocity  of  the balls.  This has no effect in -orbit

       -orbit  Make the initial force on each ball be tangential to the circle
	       on  which they are initially placed, with the right velocity to
	       hold them in orbit about each other.  After a  while,  roundoff
	       errors will cause the orbit to decay.

       -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 0.9, meaning a slight inward pull.

       -viscosity float
	       This sets the viscosity of the hypothetical fluid through which
	       the  control  points  move; the default is 1, meaning no resis‐
	       tance.  Values higher than 1 aren't interesting;	 lower	values
	       cause less motion.

	       One interesting thing to try is
	       attraction -viscosity 0.8 -points 75 \
		 -mouse -geometry =500x500
	       Give  it	 a few seconds to settle down into a stable clump, and
	       then move the mouse through it to make "waves".

       -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.

	       Turns off -mouse.

       -mouse-size integer
	       In -mouse mode, this sets the mass of the mouse (analagously to
	       the -size parameter.)

       DISPLAY to get the default host and display number.

	       to  get	the  name of a resource file that overrides the global
	       resources stored in the RESOURCE_MANAGER property.

       X(1), xscreensaver(1)

       Copyright © 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  war‐

       Jamie Zawinski <>, 13-aug-92.

       Viscosity and mouse support by Philip Edward Cutone, III.

X Version 11			   14-Jun-97		       XScreenSaver(1)

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