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- attraction - interactions of opposing forces
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-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]
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-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.
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-O\bOP\bPT\bTI\bIO\bON\bNS\bS
- _\ba_\bt_\bt_\br_\ba_\bc_\bt_\bi_\bo_\bn accepts the following options:
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- -\b-w\bwi\bin\bnd\bdo\bow\bw Draw on a newly-created window. This is the
- default.
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- -\b-r\bro\boo\bot\bt Draw on the root window.
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- -\b-m\bmo\bon\bno\bo If on a color display, pretend we're on a
- monochrome display.
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- -\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.
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- 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.
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- 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
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- 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)
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-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@netscape.com>, 13-aug-92.
-
- Viscosity and mouse support by Philip Edward Cutone, III.
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projects / xscreensaver / blobdiff