+++ /dev/null
-/* xscreensaver, Copyright (c) 1993, 1995 Jamie Zawinski <jwz@netscape.com>
- *
- * Permission to use, copy, modify, distribute, and sell this software 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 provided "as is" without express or
- * implied warranty.
- */
-
-/* This file was ported from xlock for use in xscreensaver (and standalone)
- * by jwz on 18-Oct-93. Original copyright reads:
- *
- * static char sccsid[] = "@(#)flame.c 1.4 91/09/27 XLOCK";
- *
- * flame.c - recursive fractal cosmic flames.
- *
- * Copyright (c) 1991 by Patrick J. Naughton.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted,
- * provided that the above copyright notice appear in all copies and that
- * both that copyright notice and this permission notice appear in
- * supporting documentation.
- *
- * This file is provided AS IS with no warranties of any kind. The author
- * shall have no liability with respect to the infringement of copyrights,
- * trade secrets or any patents by this file or any part thereof. In no
- * event will the author be liable for any lost revenue or profits or
- * other special, indirect and consequential damages.
- *
- * Comments and additions should be sent to the author:
- *
- * naughton@eng.sun.com
- *
- * Patrick J. Naughton
- * MS 21-14
- * Sun Laboritories, Inc.
- * 2550 Garcia Ave
- * Mountain View, CA 94043
- *
- * Revision History:
- * 27-Jun-91: vary number of functions used.
- * 24-Jun-91: fixed portability problem with integer mod (%).
- * 06-Jun-91: Written. (received from Scott Graves, spot@cs.cmu.edu).
- */
-
-#include "screenhack.h"
-
-#define POINT_BUFFER_SIZE 10
-#define MAXLEV 4
-
-static double f[2][3][MAXLEV]; /* three non-homogeneous transforms */
-static int max_total;
-static int max_levels;
-static int max_points;
-static int cur_level;
-static int snum;
-static int anum;
-static int num_points;
-static int total_points;
-static int pixcol;
-static int npixels;
-static unsigned long *pixels;
-static XPoint points [POINT_BUFFER_SIZE];
-static GC gc;
-
-static int delay, delay2;
-static int width, height;
-
-static short
-halfrandom (mv)
- int mv;
-{
- static short lasthalf = 0;
- unsigned long r;
-
- if (lasthalf)
- {
- r = lasthalf;
- lasthalf = 0;
- }
- else
- {
- r = random ();
- lasthalf = r >> 16;
- }
- return (r % mv);
-}
-
-
-static void
-init_flame (dpy, window)
- Display *dpy;
- Window window;
-{
- XGCValues gcv;
- XWindowAttributes xgwa;
- Colormap cmap;
- XGetWindowAttributes (dpy, window, &xgwa);
- width = xgwa.width;
- height = xgwa.height;
- cmap = xgwa.colormap;
-
- max_points = get_integer_resource ("iterations", "Integer");
- if (max_points <= 0) max_points = 100;
-
- max_levels = max_points;
-
- max_total = get_integer_resource ("points", "Integer");
- if (max_total <= 0) max_total = 10000;
-
- delay = get_integer_resource ("delay", "Integer");
- if (delay < 0) delay = 0;
- delay2 = get_integer_resource ("delay2", "Integer");
- if (delay2 < 0) delay2 = 0;
-
- if (mono_p)
- npixels = 0;
- else
- {
- int i = get_integer_resource ("ncolors", "Integer");
- double saturation = 1.0;
- double value = 1.0;
- XColor color;
- if (i <= 0) i = 128;
-
- pixels = (unsigned long *) malloc ((i+1) * sizeof (*pixels));
- for (npixels = 0; npixels < i; npixels++)
- {
- hsv_to_rgb ((360*npixels)/i, saturation, value,
- &color.red, &color.green, &color.blue);
- if (! XAllocColor (dpy, cmap, &color))
- break;
- pixels [npixels] = color.pixel;
- }
- }
-
- gcv.foreground = get_pixel_resource ("foreground", "Foreground", dpy, cmap);
- gcv.background = get_pixel_resource ("background", "Background", dpy, cmap);
-
- if (! mono_p)
- {
- pixcol = halfrandom (npixels);
- gcv.foreground = (pixels [pixcol]);
- }
-
- gc = XCreateGC (dpy, window, GCForeground | GCBackground, &gcv);
-}
-
-static int
-recurse (x, y, l, dpy, win)
- register double x, y;
- register int l;
- Display *dpy;
- Window win;
-{
- int xp, yp, i;
- double nx, ny;
-
- if (l == max_levels)
- {
- total_points++;
- if (total_points > max_total) /* how long each fractal runs */
- return 0;
-
- if (x > -1.0 && x < 1.0 && y > -1.0 && y < 1.0)
- {
- xp = points[num_points].x = (int) ((width / 2) * (x + 1.0));
- yp = points[num_points].y = (int) ((height / 2) * (y + 1.0));
- num_points++;
- if (num_points >= POINT_BUFFER_SIZE)
- {
- XDrawPoints (dpy, win, gc, points, num_points, CoordModeOrigin);
- num_points = 0;
- /* if (delay) usleep (delay); */
- /* XSync (dpy, True); */
- }
- }
- }
- else
- {
- for (i = 0; i < snum; i++)
- {
- nx = f[0][0][i] * x + f[0][1][i] * y + f[0][2][i];
- ny = f[1][0][i] * x + f[1][1][i] * y + f[1][2][i];
- if (i < anum)
- {
- nx = sin(nx);
- ny = sin(ny);
- }
- if (!recurse (nx, ny, l + 1, dpy, win))
- return 0;
- }
- }
- return 1;
-}
-
-
-static void
-flame (dpy, window)
- Display *dpy;
- Window window;
-{
- int i, j, k;
- static int alt = 0;
-
- if (!(cur_level++ % max_levels))
- {
- if (delay2) usleep (delay2);
- XClearWindow (dpy, window);
- alt = !alt;
- }
- else
- {
- if (npixels > 2)
- {
- XSetForeground (dpy, gc, pixels [pixcol]);
- if (--pixcol < 0)
- pixcol = npixels - 1;
- }
- }
-
- /* number of functions */
- snum = 2 + (cur_level % (MAXLEV - 1));
-
- /* how many of them are of alternate form */
- if (alt)
- anum = 0;
- else
- anum = halfrandom (snum) + 2;
-
- /* 6 coefs per function */
- for (k = 0; k < snum; k++)
- {
- for (i = 0; i < 2; i++)
- for (j = 0; j < 3; j++)
- f[i][j][k] = ((double) (random() & 1023) / 512.0 - 1.0);
- }
- num_points = 0;
- total_points = 0;
- (void) recurse (0.0, 0.0, 0, dpy, window);
- XDrawPoints (dpy, window, gc, points, num_points, CoordModeOrigin);
- XSync (dpy, True);
- if (delay) usleep (delay);
-}
-
-
-#ifdef __hpux
-/* I don't understand why this is necessary, but I'm told that this program
- does nothing at all on HP-sUX without it.
- */
-#undef random
-#undef srandom
-#include <math.h>
-int matherr(x)
- register struct exception *x;
-{
- if (x->type == PLOSS) return 1;
- else return 0;
-}
-#endif /* __hpux */
-
-
-\f
-char *progclass = "Flame";
-
-char *defaults [] = {
- "Flame.background: black", /* to placate SGI */
- "Flame.foreground: white",
- "*colors: 128",
- "*iterations: 25",
- "*delay: 50000",
- "*delay2: 2000000",
- "*points: 10000",
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-ncolors", ".colors", XrmoptionSepArg, 0 },
- { "-iterations", ".iterations", XrmoptionSepArg, 0 },
- { "-delay", ".delay", XrmoptionSepArg, 0 },
- { "-delay2", ".delay2", XrmoptionSepArg, 0 },
- { "-points", ".points", XrmoptionSepArg, 0 }
-};
-int options_size = (sizeof (options) / sizeof (options[0]));
-
-void
-screenhack (dpy, window)
- Display *dpy;
- Window window;
-{
- init_flame (dpy, window);
- while (1)
- flame (dpy, window);
-}
projects / xscreensaver / blobdiff