| 1 | /* xscreensaver, Copyright (c) 1992, 1996, 1998, 2001 |
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| 2 | * Jamie Zawinski <jwz@jwz.org> |
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| 3 | * |
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| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
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| 5 | * documentation for any purpose is hereby granted without fee, provided that |
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| 6 | * the above copyright notice appear in all copies and that both that |
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| 7 | * copyright notice and this permission notice appear in supporting |
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| 8 | * documentation. No representations are made about the suitability of this |
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| 9 | * software for any purpose. It is provided "as is" without express or |
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| 10 | * implied warranty. |
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| 11 | * |
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| 12 | * 19971004: Johannes Keukelaar <johannes@nada.kth.se>: Use helix screen |
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| 13 | * eraser. |
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| 14 | */ |
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| 15 | |
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| 16 | #include "screenhack.h" |
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| 17 | #include "erase.h" |
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| 18 | |
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| 19 | static GC draw_gc, erase_gc; |
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| 20 | static unsigned int default_fg_pixel; |
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| 21 | static int iterations, offset; |
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| 22 | static Bool xsym, ysym; |
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| 23 | static int sleep_time; |
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| 24 | |
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| 25 | static void |
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| 26 | init_rorschach (Display *dpy, Window window) |
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| 27 | { |
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| 28 | XGCValues gcv; |
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| 29 | Colormap cmap; |
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| 30 | XWindowAttributes xgwa; |
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| 31 | XGetWindowAttributes (dpy, window, &xgwa); |
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| 32 | cmap = xgwa.colormap; |
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| 33 | gcv.foreground = default_fg_pixel = |
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| 34 | get_pixel_resource ("foreground", "Foreground", dpy, cmap); |
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| 35 | draw_gc = XCreateGC (dpy, window, GCForeground, &gcv); |
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| 36 | gcv.foreground = get_pixel_resource ("background", "Background", dpy, cmap); |
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| 37 | erase_gc = XCreateGC (dpy, window, GCForeground, &gcv); |
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| 38 | iterations = get_integer_resource ("iterations", "Integer"); |
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| 39 | offset = get_integer_resource ("offset", "Integer"); |
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| 40 | if (offset <= 0) offset = 3; |
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| 41 | if (iterations < 10) iterations = 10; |
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| 42 | xsym = get_boolean_resource ("xsymmetry", "Symmetry"); |
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| 43 | ysym = get_boolean_resource ("ysymmetry", "Symmetry"); |
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| 44 | } |
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| 45 | |
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| 46 | static void |
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| 47 | hurm (Display *dpy, Window window) |
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| 48 | { |
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| 49 | Colormap cmap; |
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| 50 | XWindowAttributes xgwa; |
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| 51 | int xlim, ylim, x, y, i, got_color = 0; |
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| 52 | XPoint points [4]; |
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| 53 | XColor color; |
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| 54 | XClearWindow (dpy, window); |
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| 55 | XGetWindowAttributes (dpy, window, &xgwa); |
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| 56 | xlim = xgwa.width; |
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| 57 | ylim = xgwa.height; |
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| 58 | cmap = xgwa.colormap; |
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| 59 | |
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| 60 | if (! mono_p) |
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| 61 | hsv_to_rgb (random()%360, 1.0, 1.0, &color.red, &color.green, &color.blue); |
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| 62 | if ((!mono_p) && (got_color = XAllocColor (dpy, cmap, &color))) |
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| 63 | XSetForeground (dpy, draw_gc, color.pixel); |
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| 64 | else |
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| 65 | XSetForeground (dpy, draw_gc, default_fg_pixel); |
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| 66 | |
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| 67 | x = xlim/2; |
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| 68 | y = ylim/2; |
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| 69 | for (i = 0; i < iterations; i++) |
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| 70 | { |
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| 71 | int j = 0; |
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| 72 | x += ((random () % (1 + (offset << 1))) - offset); |
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| 73 | y += ((random () % (1 + (offset << 1))) - offset); |
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| 74 | points [j].x = x; |
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| 75 | points [j].y = y; |
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| 76 | j++; |
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| 77 | if (xsym) |
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| 78 | { |
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| 79 | points [j].x = xlim - x; |
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| 80 | points [j].y = y; |
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| 81 | j++; |
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| 82 | } |
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| 83 | if (ysym) |
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| 84 | { |
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| 85 | points [j].x = x; |
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| 86 | points [j].y = ylim - y; |
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| 87 | j++; |
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| 88 | } |
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| 89 | if (xsym && ysym) |
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| 90 | { |
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| 91 | points [j].x = xlim - x; |
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| 92 | points [j].y = ylim - y; |
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| 93 | j++; |
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| 94 | } |
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| 95 | XDrawPoints (dpy, window, draw_gc, points, j, CoordModeOrigin); |
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| 96 | XSync (dpy, False); |
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| 97 | screenhack_handle_events (dpy); |
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| 98 | } |
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| 99 | sleep ( sleep_time ); |
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| 100 | |
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| 101 | erase_full_window(dpy, window); |
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| 102 | |
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| 103 | XClearWindow (dpy, window); |
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| 104 | if (got_color) XFreeColors (dpy, cmap, &color.pixel, 1, 0); |
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| 105 | XSync (dpy, False); |
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| 106 | screenhack_handle_events (dpy); |
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| 107 | sleep (1); |
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| 108 | } |
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| 109 | |
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| 110 | |
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| 111 | char *progclass = "Rorschach"; |
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| 112 | |
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| 113 | char *defaults [] = { |
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| 114 | ".background: black", |
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| 115 | ".foreground: white", |
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| 116 | "*xsymmetry: true", |
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| 117 | "*ysymmetry: false", |
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| 118 | "*iterations: 4000", |
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| 119 | "*offset: 4", |
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| 120 | "*delay: 5", |
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| 121 | 0 |
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| 122 | }; |
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| 123 | |
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| 124 | XrmOptionDescRec options [] = { |
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| 125 | { "-iterations", ".iterations", XrmoptionSepArg, 0 }, |
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| 126 | { "-offset", ".offset", XrmoptionSepArg, 0 }, |
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| 127 | { "-xsymmetry", ".xsymmetry", XrmoptionNoArg, "true" }, |
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| 128 | { "-ysymmetry", ".ysymmetry", XrmoptionNoArg, "true" }, |
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| 129 | { "-no-xsymmetry", ".xsymmetry", XrmoptionNoArg, "false" }, |
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| 130 | { "-no-ysymmetry", ".ysymmetry", XrmoptionNoArg, "false" }, |
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| 131 | { "-erase-speed", ".eraseSpeed", XrmoptionSepArg, 0 }, |
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| 132 | { "-delay", ".delay", XrmoptionSepArg, 0 }, |
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| 133 | { 0, 0, 0, 0 } |
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| 134 | }; |
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| 135 | |
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| 136 | void |
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| 137 | screenhack (Display *dpy, Window window) |
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| 138 | { |
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| 139 | sleep_time = get_integer_resource("delay", "Integer"); |
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| 140 | init_rorschach (dpy, window); |
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| 141 | while (1) |
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| 142 | hurm (dpy, window); |
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| 143 | } |
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