+++ /dev/null
-/* xscreensaver, Copyright (c) 1993, 1995, 1996, 1998
- * Jamie Zawinski <jwz@jwz.org>
- *
- * 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. (And again, 11-May-97.) 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:
- * 01-Jun-95: This should look more like the original with some updates by
- * Scott Draves.
- * 27-Jun-91: vary number of functions used.
- * 24-Jun-91: fixed portability problem with integer mod (%).
- * 06-Jun-91: Written. (received from Scott Draves, spot@cs.cmu.edu).
- */
-
-#include <math.h>
-#include "screenhack.h"
-
-#include <signal.h> /* so we can ignore SIGFPE */
-
-#define POINT_BUFFER_SIZE 10
-#define MAXLEV 4
-#define MAXKINDS 10
-
-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 variation;
-static int snum;
-static int anum;
-static int num_points;
-static int total_points;
-static int pixcol;
-static int ncolors;
-static XColor *colors;
-static XPoint points [POINT_BUFFER_SIZE];
-static GC gc;
-
-static int delay, delay2;
-static int width, height;
-
-static short
-halfrandom (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 (Display *dpy, Window window)
-{
- XGCValues gcv;
- XWindowAttributes xgwa;
- Colormap cmap;
-
-#if defined(SIGFPE) && defined(SIG_IGN)
- /* No doubt a better fix would be to track down where the NaN is coming
- from, and code around that; but this should do. Apparently most systems
- (Linux, Solaris, Irix, ...) ignore FPE by default -- but FreeBSD dumps
- core by default. */
- signal (SIGFPE, SIG_IGN);
-#endif
-
- 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;
-
- variation = random() % MAXKINDS;
-
- if (mono_p)
- ncolors = 0;
- else
- {
- ncolors = get_integer_resource ("colors", "Integer");
- if (ncolors <= 0) ncolors = 128;
- colors = (XColor *) malloc ((ncolors+1) * sizeof (*colors));
- make_smooth_colormap (dpy, xgwa.visual, xgwa.colormap, colors, &ncolors,
- True, 0, True);
- if (ncolors <= 2)
- mono_p = True, ncolors = 0;
- }
-
- gcv.foreground = get_pixel_resource ("foreground", "Foreground", dpy, cmap);
- gcv.background = get_pixel_resource ("background", "Background", dpy, cmap);
-
- if (! mono_p)
- {
- pixcol = halfrandom (ncolors);
- gcv.foreground = (colors [pixcol].pixel);
- }
-
- gc = XCreateGC (dpy, window, GCForeground | GCBackground, &gcv);
-}
-
-static int
-recurse (double x, double y, 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, False); */
- }
- }
- }
- else
- {
- for (i = 0; i < snum; i++)
- {
-
- /* Scale back when values get very large. Spot sez:
- "I think this happens on HPUX. I think it's non-IEEE
- to generate an exception instead of a silent NaN."
- */
- if ((abs(x) > 1.0E5) || (abs(y) > 1.0E5))
- x = x / y;
-
- 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)
- {
- switch (variation)
- {
- case 0: /* sinusoidal */
- nx = sin(nx);
- ny = sin(ny);
- break;
- case 1: /* complex */
- {
- double r2 = nx * nx + ny * ny + 1e-6;
- nx = nx / r2;
- ny = ny / r2;
- }
- break;
- case 2: /* bent */
- if (nx < 0.0)
- nx = nx * 2.0;
- if (ny < 0.0)
- ny = ny / 2.0;
- break;
- case 3: /* swirl */
- {
- double r = (nx * nx + ny * ny); /* times k here is fun */
- double c1 = sin(r);
- double c2 = cos(r);
- double t = nx;
-
- if (nx > 1e4 || nx < -1e4 || ny > 1e4 || ny < -1e4)
- ny = 1e4;
- else
- ny = c2 * t + c1 * ny;
- nx = c1 * nx - c2 * ny;
- }
- break;
- case 4: /* horseshoe */
- {
- double r, c1, c2, t;
-
- /* Avoid atan2: DOMAIN error message */
- if (nx == 0.0 && ny == 0.0)
- r = 0.0;
- else
- r = atan2(nx, ny); /* times k here is fun */
- c1 = sin(r);
- c2 = cos(r);
- t = nx;
-
- nx = c1 * nx - c2 * ny;
- ny = c2 * t + c1 * ny;
- }
- break;
- case 5: /* drape */
- {
- double t;
-
- /* Avoid atan2: DOMAIN error message */
- if (nx == 0.0 && ny == 0.0)
- t = 0.0;
- else
- t = atan2(nx, ny) / M_PI;
-
- if (nx > 1e4 || nx < -1e4 || ny > 1e4 || ny < -1e4)
- ny = 1e4;
- else
- ny = sqrt(nx * nx + ny * ny) - 1.0;
- nx = t;
- }
- break;
- case 6: /* broken */
- if (nx > 1.0)
- nx = nx - 1.0;
- if (nx < -1.0)
- nx = nx + 1.0;
- if (ny > 1.0)
- ny = ny - 1.0;
- if (ny < -1.0)
- ny = ny + 1.0;
- break;
- case 7: /* spherical */
- {
- double r = 0.5 + sqrt(nx * nx + ny * ny + 1e-6);
-
- nx = nx / r;
- ny = ny / r;
- }
- break;
- case 8: /* */
- nx = atan(nx) / M_PI_2;
- ny = atan(ny) / M_PI_2;
- break;
-/* #if 0 */ /* core dumps on some machines, why not all? */
- case 9: /* complex sine */
- {
- double u = nx;
- double v = ny;
- double ev = exp(v);
- double emv = exp(-v);
-
- nx = (ev + emv) * sin(u) / 2.0;
- ny = (ev - emv) * cos(u) / 2.0;
- }
- break;
- case 10: /* polynomial */
- if (nx < 0)
- nx = -nx * nx;
- else
- nx = nx * nx;
- if (ny < 0)
- ny = -ny * ny;
- else
- ny = ny * ny;
- break;
-/* #endif */
- default:
- nx = sin(nx);
- ny = sin(ny);
- }
- }
- if (!recurse (nx, ny, l + 1, dpy, win))
- return 0;
- }
- }
- return 1;
-}
-
-
-static void
-flame (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;
-
- variation = random() % MAXKINDS;
- }
- else
- {
- if (ncolors > 2)
- {
- XSetForeground (dpy, gc, colors [pixcol].pixel);
- if (--pixcol < 0)
- pixcol = ncolors - 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, False);
- if (delay) usleep (delay);
-}
-
-
-#if defined(__hpux) && defined(PLOSS)
-/* I don't understand why this is necessary, but I'm told that this program
- does nothing at all on HP-sUX without it.
-
- I'm further told that HPUX 11.0 doesn't define PLOSS, and works ok without
- this section. Go figure.
- */
-#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 [] = {
- ".background: black",
- ".foreground: white",
- "*colors: 64",
- "*iterations: 25",
- "*delay: 50000",
- "*delay2: 2000000",
- "*points: 10000",
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-colors", ".colors", XrmoptionSepArg, 0 },
- { "-iterations", ".iterations", XrmoptionSepArg, 0 },
- { "-delay", ".delay", XrmoptionSepArg, 0 },
- { "-delay2", ".delay2", XrmoptionSepArg, 0 },
- { "-points", ".points", XrmoptionSepArg, 0 },
- { 0, 0, 0, 0 }
-};
-
-void
-screenhack (Display *dpy, Window window)
-{
- init_flame (dpy, window);
- while (1)
- {
- flame (dpy, window);
- screenhack_handle_events (dpy);
- }
-}
projects / xscreensaver / blobdiff