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attraction(6)		      XScreenSaver manual		 attraction(6)

NAME
       attraction - interactions of opposing forces

SYNOPSIS
       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-
       size]  [-walls]	[-nowalls] [-maxspeed] [-nomaxspeed] [-correct-bounce]
       [-fast-bounce] [-fps]

DESCRIPTION
       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.

OPTIONS
       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
	       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
	       visual.

       -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
	       particle.

	       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 500.  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
	       mode.

       -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.

       -no-mouse
	       Turns off -mouse.

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

       -nowalls
	       This will cause the balls to continue on past the edge  of  the
	       screen  or  window.   They  will still be kept track of and can
	       come back.

       -walls  This will cause the balls to bounce when they get to  the  edge
	       of the screen or window.	 This is the default behavior.

       -maxspeed
	       Imposes	a  maximum  speed  (default).  If a ball ends up going
	       faster than this, it will be treated as though  there  were  .9
	       viscosity  until	 it  is	 under the limit. This stops the balls
	       from continually accelerating (which they have  a  tendency  to
	       do), but also causes balls moving very fast to tend to clump in
	       the lower right corner.

       -nomaxspeed
	       If this is specified, no maximum speed is set for the balls.

       -fast-bounce
	       Uses the old, simple bouncing algorithm (default).  This simply
	       moves  any  ball	 that  is  out	of  bounds  back to a wall and
	       reverses its velocity.  This works fine	for  most  cases,  but
	       under some circumstances, the simplification can lead to annoy‐
	       ing effects.

       -correct-bounce
	       Uses a more intelligent bouncing algorithm.  This method	 actu‐
	       ally  reflects  the  balls  off the walls until they are within
	       bounds.	This can be slow if balls are bouncing	a  whole  lot,
	       perhaps because of -nomaxspeed.

       -graphmode none | x | y | both | speed
	       For "x", "y", and "both", displays the given velocities of each
	       ball as a bar graph in the  same	 window	 as  the  balls.   For
	       "speed",	 displays  the	total  speed of each ball.  Default is
	       "none".

       -fps    Display the current frame rate and CPU load.

ENVIRONMENT
       DISPLAY to get the default host and display number.

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

SEE ALSO
       X(1), xscreensaver(1)

COPYRIGHT
       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‐
       ranty.

AUTHOR
       Jamie Zawinski <jwz@jwz.org>, 13-aug-92.

       Viscosity and mouse support by Philip Edward Cutone, III.

       Walls, speed limit options, new bouncing, graphs, and tail mode fix  by
       Matthew Strait. 31 March 2001

X Version 11		      5.07 (10-Aug-2008)		 attraction(6)
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