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+ attraction - interactions of opposing forces
+
+S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
+ a\bat\btt\btr\bra\bac\bct\bti\bio\bon\bn [-display _\bh_\bo_\bs_\bt_\b:_\bd_\bi_\bs_\bp_\bl_\ba_\by_\b._\bs_\bc_\br_\be_\be_\bn] [-foreground
+ _\bc_\bo_\bl_\bo_\br] [-background _\bc_\bo_\bl_\bo_\br] [-window] [-root] [-mono]
+ [-install] [-visual _\bv_\bi_\bs_\bu_\ba_\bl] [-points _\bi_\bn_\bt] [-threshold _\bi_\bn_\bt]
+ [-mode balls | lines | polygons | splines | filled-splines
+ | tails ] [-size _\bi_\bn_\bt] [-segments _\bi_\bn_\bt] [-delay _\bu_\bs_\be_\bc_\bs]
+ [-color-shift _\bi_\bn_\bt] [-radius _\bi_\bn_\bt] [-vx _\bi_\bn_\bt] [-vy _\bi_\bn_\bt]
+ [-glow] [-noglow] [-orbit] [-viscosity _\bf_\bl_\bo_\ba_\bt] [-mouse]
+ [-no-mouse] [-mouse-size]
+
+D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
+ The _\ba_\bt_\bt_\br_\ba_\bc_\bt_\bi_\bo_\bn program has several visually different
+ modes of operation, all of which are based on the interac-
+ tions 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.
+
+O\bOP\bPT\bTI\bIO\bON\bNS\bS
+ _\ba_\bt_\bt_\br_\ba_\bc_\bt_\bi_\bo_\bn accepts the following options:
+
+ -\b-w\bwi\bin\bnd\bdo\bow\bw Draw on a newly-created window. This is the
+ default.
+
+ -\b-r\bro\boo\bot\bt Draw on the root window.
+
+ -\b-m\bmo\bon\bno\bo If on a color display, pretend we're on a
+ monochrome display.
+
+ -\b-i\bin\bns\bst\bta\bal\bll\bl
+ Install a private colormap for the window.
+
+ -\b-v\bvi\bis\bsu\bua\bal\bl _\bv_\bi_\bs_\bu_\ba_\bl
+ 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.
+
+ -\b-p\bpo\boi\bin\bnt\bts\bs i\bin\bnt\bte\beg\bge\ber\br
+ How many control points should be used, or 0 to
+ select the number randomly. Default 0. Between 3
+ and 15 works best.
+
+ -\b-t\bth\bhr\bre\bes\bsh\bho\bol\bld\bd i\bin\bnt\bte\beg\bge\ber\br
+ The distance (in pixels) from each particle at
+ which the attractive force becomes repulsive.
+ Default 100.
+
+ -\b-m\bmo\bod\bde\be b\bba\bal\bll\bls\bs |\b| l\bli\bin\bne\bes\bs |\b| p\bpo\bol\bly\byg\bgo\bon\bns\bs |\b| t\bta\bai\bil\bls\bs |\b| s\bsp\bpl\bli\bin\bne\bes\bs |\b| f\bfi\bil\bll\ble\bed\bd-\b-
+ s\bsp\bpl\bli\bin\bne\bes\bs
+ In _\bb_\ba_\bl_\bl_\bs mode (the default) the control points are
+ drawn as filled circles. The larger the circle,
+
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+ the more massive the particle.
+
+ In _\bl_\bi_\bn_\be_\bs mode, the control points are connected by
+ straight lines; the effect is something like _\bq_\bi_\bx.
+
+ In _\bp_\bo_\bl_\by_\bg_\bo_\bn_\bs mode, the control points are connected
+ by straight lines, and filled in. This is most
+ interesting in color.
+
+ In _\bs_\bp_\bl_\bi_\bn_\be_\bs mode, a closed spline is interpolated
+ from the control points.
+
+ In _\bf_\bi_\bl_\bl_\be_\bd_\b-_\bs_\bp_\bl_\bi_\bn_\be_\bs mode, the splines are filled in
+ instead of being outlines. This is most interest-
+ ing in color.
+
+ In _\bt_\ba_\bi_\bl_\bs mode, the path which each particle fol-
+ lows is indicated by a worm-like trail, whose
+ length is controlled by the _\bs_\be_\bg_\bm_\be_\bn_\bt_\bs parameter.
+
+ -\b-s\bsi\biz\bze\be i\bin\bnt\bte\beg\bge\ber\br
+ 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.
+
+ -\b-s\bse\beg\bgm\bme\ben\bnt\bts\bs i\bin\bnt\bte\beg\bge\ber\br
+ If in _\bl_\bi_\bn_\be_\bs or _\bp_\bo_\bl_\by_\bg_\bo_\bn_\bs mode, how many sets of
+ line segments or polygons should be drawn. Default
+ 100. This has no effect in _\bb_\ba_\bl_\bl_\bs mode. If _\bs_\be_\bg_\b-
+ _\bm_\be_\bn_\bt_\bs is 0, then no segments will ever be erased
+ (this is only useful in color.)
+
+ -\b-d\bde\bel\bla\bay\by m\bmi\bic\bcr\bro\bos\bse\bec\bco\bon\bnd\bds\bs
+ How much of a delay should be introduced between
+ steps of the animation. Default 10000, or about
+ 0.01 seconds.
+
+ -\b-c\bco\bol\blo\bor\br-\b-s\bsh\bhi\bif\bft\bt i\bin\bnt\bt
+ If on a color display, the color of the line seg-
+ ments or polygons will cycle through the color
+ map. This specifies how many lines will be drawn
+ before a new color is chosen. (When a small num-
+ ber of colors are available, increasing this value
+ will yield smoother transitions.) Default 3.
+ This has no effect in _\bb_\ba_\bl_\bl_\bs mode.
+
+ -\b-r\bra\bad\bdi\biu\bus\bs The size in pixels of the circle on which the
+ points are initially positioned. The default is
+ slightly smaller than the size of the window.
+
+ -\b-g\bgl\blo\bow\bw This is consulted only in _\bb_\ba_\bl_\bl_\bs mode. If this is
+
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+ 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 _\bg_\bl_\bo_\bw 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.
+
+ -\b-n\bno\bog\bgl\blo\bow\bw Don't do ``glowing.'' This is the default.
+
+ -\b-v\bvx\bx p\bpi\bix\bxe\bel\bls\bs
+
+ -\b-v\bvy\by p\bpi\bix\bxe\bel\bls\bs
+ Initial velocity of the balls. This has no effect
+ in -\b-o\bor\brb\bbi\bit\bt mode.
+
+ -\b-o\bor\brb\bbi\bit\bt 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.
+
+ -\b-v\bvm\bmu\bul\blt\bt f\bfl\blo\boa\bat\bt
+ 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.
+
+ -\b-v\bvi\bis\bsc\bco\bos\bsi\bit\bty\by f\bfl\blo\boa\bat\bt
+ 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
+
+ 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".
+
+ -\b-m\bmo\bou\bus\bse\be This will cause the mouse to be considered a con-
+ trol 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.
+
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+ -\b-n\bno\bo-\b-m\bmo\bou\bus\bse\be
+ Turns off -\b-m\bmo\bou\bus\bse\be.
+
+ -\b-m\bmo\bou\bus\bse\be-\b-s\bsi\biz\bze\be i\bin\bnt\bte\beg\bge\ber\br
+ In -\b-m\bmo\bou\bus\bse\be mode, this sets the mass of the mouse
+ (analagously to the -\b-s\bsi\biz\bze\be parameter.)
+
+E\bEN\bNV\bVI\bIR\bRO\bON\bNM\bME\bEN\bNT\bT
+ D\bDI\bIS\bSP\bPL\bLA\bAY\bY to get the default host and display number.
+
+ X\bXE\bEN\bNV\bVI\bIR\bRO\bON\bNM\bME\bEN\bNT\bT
+ to get the name of a resource file that overrides
+ the global resources stored in the RESOURCE_MAN-
+ AGER property.
+
+S\bSE\bEE\bE A\bAL\bLS\bSO\bO
+ X\bX(1), x\bxs\bsc\bcr\bre\bee\ben\bns\bsa\bav\bve\ber\br(1)
+
+C\bCO\bOP\bPY\bYR\bRI\bIG\bGH\bHT\bT
+ Copyright (C) 1992, 1993, 1997 by Jamie Zawinski. Permis-
+ sion to use, copy, modify, distribute, and sell this soft-
+ ware 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 pro-
+ vided "as is" without express or implied warranty.
+
+A\bAU\bUT\bTH\bHO\bOR\bR
+ Jamie Zawinski <jwz@jwz.org>, 13-aug-92.
+
+ Viscosity and mouse support by Philip Edward Cutone, III.
+
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projects / xscreensaver / blobdiff