| 1 | .TH XScreenSaver 1 "10-May-97" "X Version 11" |
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| 2 | .SH NAME |
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| 3 | rd-bomb - reaction/diffusion textures |
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| 4 | .SH SYNOPSIS |
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| 5 | .B rd-bomb |
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| 6 | [\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] |
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| 7 | [\-background \fIcolor\fP] [\-window] [\-root] [\-install] |
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| 8 | [\-visual \fIvisual\fP] [\-width \fIn\fP] [\-height \fIn\fP] |
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| 9 | [\-reaction \fIn\fP] [\-diffusion \fIn\fP] |
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| 10 | [\-size \fIf\fP] [\-speed \fIf\fP] [\-delay \fIusecs\fP] |
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| 11 | .SH DESCRIPTION |
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| 12 | |
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| 13 | The \fIrd-bomb\fP program draws reaction/diffusion textures. The code |
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| 14 | is derived from the 'd' mode of the "bomb" visual musical instrument |
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| 15 | (see http://www.cs.cmu.edu/~spot/bomb.html). I got the equations from |
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| 16 | xmorphia (http://www.ccsf.caltech.edu/ismap/image.html), which is |
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| 17 | based on a version of the Gray-Scott model taken from: |
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| 18 | John E. Pearson "Complex Patterns in a Simple System" |
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| 19 | Science, 261,189, 9 July 1993. |
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| 20 | |
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| 21 | If the frame-rate is too low, consider decreasing the width and height |
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| 22 | of the tile, or decreasing the size of the active part of the screen. |
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| 23 | |
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| 24 | .SH OPTIONS |
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| 25 | |
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| 26 | If one of the reaction, diffusion, radius, and palette options is set |
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| 27 | to a negative value, then that option will be set to a random |
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| 28 | appropriate value. |
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| 29 | |
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| 30 | Be sure to try "-speed 1 -size 0.1 -epoch 3000". |
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| 31 | |
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| 32 | .I rd-bomb |
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| 33 | accepts the following options: |
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| 34 | .TP 8 |
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| 35 | .B \-window |
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| 36 | Draw on a newly-created window. This is the default. |
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| 37 | .TP 8 |
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| 38 | .B \-root |
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| 39 | Draw on the root window. |
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| 40 | .TP 8 |
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| 41 | .B \-install |
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| 42 | Install a private colormap for the window. |
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| 43 | .TP 8 |
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| 44 | .B \-visual \fIvisual\fP |
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| 45 | Specify which visual to use. Legal values are the name of a visual class, |
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| 46 | or the id number (decimal or hex) of a specific visual. |
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| 47 | .TP 8 |
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| 48 | .B \-width \fIn\fP |
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| 49 | .TP 8 |
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| 50 | .B \-height \fIn\fP |
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| 51 | Specify the size of the tile, in pixels. |
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| 52 | .TP 8 |
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| 53 | .B \-reaction \fIn\fP |
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| 54 | .TP 8 |
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| 55 | .B \-diffusion \fIn\fP |
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| 56 | These are constants in the equations that effect its visual nature. |
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| 57 | Each may be one of 0, 1, or 2. |
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| 58 | .TP 8 |
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| 59 | .B \-radius \fIn\fP |
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| 60 | Size of the seed. |
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| 61 | .TP 8 |
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| 62 | .B \-palette \fIn\fP |
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| 63 | Selects a palette. Must be between 0 and 80, inclusive. |
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| 64 | .TP 8 |
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| 65 | .B \-size \fIf\fP |
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| 66 | What fraction of the window is actively drawn, a floating point number |
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| 67 | between 0 (exclusive) and 1 (inclusive). Default is 0.66. |
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| 68 | .TP 8 |
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| 69 | .B \-speed \fIf\fP |
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| 70 | When a fraction of the screen is active, the active area moves at this |
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| 71 | rate (a floating point number). Default is zero. Suggested value: 1.0. |
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| 72 | .TP 8 |
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| 73 | .B \-delay \fIusecs\fP |
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| 74 | How many microseconds to delay between frames; default 1000, or |
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| 75 | about 1/1000th of a second. |
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| 76 | .SH ENVIRONMENT |
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| 77 | .PP |
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| 78 | .TP 8 |
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| 79 | .B DISPLAY |
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| 80 | to get the default host and display number. |
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| 81 | .TP 8 |
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| 82 | .B XENVIRONMENT |
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| 83 | to get the name of a resource file that overrides the global resources |
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| 84 | stored in the RESOURCE_MANAGER property. |
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| 85 | .SH SEE ALSO |
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| 86 | .BR X (1), |
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| 87 | .BR xscreensaver (1), |
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| 88 | .BR xlock (1) |
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| 89 | .SH COPYRIGHT |
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| 90 | Copyright \(co 1997 by Scott Draves. |
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| 91 | |
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| 92 | Permission to use, copy, modify, and distribute this software and its |
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| 93 | documentation for any purpose and without fee is hereby granted, |
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| 94 | provided that the above copyright notice appear in all copies and that |
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| 95 | both that copyright notice and this permission notice appear in |
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| 96 | supporting documentation. |
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| 97 | .SH AUTHOR |
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| 98 | Scott Draves <spot@cs.cmu.edu>, 9/97 |
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