| 1 | .TH XScreenSaver 1 "28-May-97" "X Version 11" |
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| 2 | .SH NAME |
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| 3 | julia - draws spinning, animating julia-set fractals |
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| 4 | .SH SYNOPSIS |
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| 5 | .B julia |
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| 6 | [\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-ncolors \fIinteger\fP] [\-delay \fImicroseconds\fP] [\-cycles \fIinteger\fP] [\-count \fIinteger\fP] [\-mouse] [\-nomouse] |
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| 7 | |
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| 8 | .SH DESCRIPTION |
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| 9 | The \fIjulia\fP program draws spinning, animating julia-set fractals. |
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| 10 | |
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| 11 | It uses ifs {w0 = sqrt(x-c), w1 = -sqrt(x-c)} with random iteration |
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| 12 | to plot the julia set, and sinusoidially varied parameters for the set, |
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| 13 | and plots parameters with a circle. |
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| 14 | |
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| 15 | One thing to note is that count is the \fIdepth\fP of the search tree, |
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| 16 | so the number of points computed is (2^count)-1. I use 8 or 9 on a |
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| 17 | dx266 and it looks okay. The sinusoidal variation of the parameter |
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| 18 | might not be as interesting as it could, but it still gives an idea |
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| 19 | of the effect of the parameter. |
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| 20 | |
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| 21 | .SH OPTIONS |
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| 22 | .I julia |
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| 23 | accepts the following options: |
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| 24 | .TP 8 |
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| 25 | .B \-window |
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| 26 | Draw on a newly-created window. This is the default. |
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| 27 | .TP 8 |
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| 28 | .B \-root |
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| 29 | Draw on the root window. |
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| 30 | .TP 8 |
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| 31 | .B \-mono |
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| 32 | If on a color display, pretend we're on a monochrome display. |
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| 33 | .TP 8 |
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| 34 | .B \-install |
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| 35 | Install a private colormap for the window. |
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| 36 | .TP 8 |
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| 37 | .B \-visual \fIvisual\fP |
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| 38 | Specify which visual to use. Legal values are the name of a visual class, |
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| 39 | or the id number (decimal or hex) of a specific visual. |
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| 40 | .TP 8 |
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| 41 | .B \-ncolors \fIinteger\fP |
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| 42 | How many colors should be used (if possible). Default 200. |
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| 43 | The colors used cycle through the hue, making N stops around |
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| 44 | the color wheel. |
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| 45 | .TP 8 |
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| 46 | .B \-cycles \fIinteger\fP |
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| 47 | |
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| 48 | .TP 8 |
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| 49 | .B \-count \fIinteger\fP |
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| 50 | |
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| 51 | .TP 8 |
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| 52 | .B \-mouse |
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| 53 | .TP 8 |
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| 54 | .B \-nomouse |
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| 55 | If \fI\-mouse\fP is specified, the control point of the Julia set will |
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| 56 | be derived from the position of the mouse in the window. When the mouse |
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| 57 | is not in the window, the control point is chosen the normal way. |
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| 58 | .SH ENVIRONMENT |
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| 59 | .PP |
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| 60 | .TP 8 |
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| 61 | .B DISPLAY |
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| 62 | to get the default host and display number. |
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| 63 | .TP 8 |
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| 64 | .B XENVIRONMENT |
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| 65 | to get the name of a resource file that overrides the global resources |
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| 66 | stored in the RESOURCE_MANAGER property. |
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| 67 | .SH SEE ALSO |
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| 68 | .BR X (1), |
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| 69 | .BR xscreensaver (1), |
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| 70 | .BR xlock (1) |
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| 71 | .SH COPYRIGHT |
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| 72 | Copyright \(co 1995 by Sean McCullough. |
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| 73 | |
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| 74 | Permission to use, copy, modify, and distribute this software and its |
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| 75 | documentation for any purpose and without fee is hereby granted, |
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| 76 | provided that the above copyright notice appear in all copies and that |
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| 77 | both that copyright notice and this permission notice appear in |
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| 78 | supporting documentation. |
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| 79 | .SH AUTHOR |
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| 80 | Sean McCullough <bankshot@mailhost.nmt.edu>, 1995. |
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| 81 | |
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| 82 | Ability to run standalone or with \fIxscreensaver\fP added by |
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| 83 | Jamie Zawinski <jwz@jwz.org>, 10-May-97. |
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