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diff --git a/hacks/galaxy.c b/hacks/galaxy.c
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+/* -*- Mode: C; tab-width: 4 -*- */
+/* galaxy --- spinning galaxies */
+/* #include<math.h>*/
+#if 0
+static const char sccsid[] = "@(#)galaxy.c 4.04 97/07/28 xlockmore";
+#endif
+
+/* Originally done by Uli Siegmund <uli@wombat.okapi.sub.org> on Amiga
+ * for EGS in Cluster
+ * Port from Cluster/EGS to C/Intuition by Harald Backert
+ * Port to X11 and incorporation into xlockmore by Hubert Feyrer
+ * <hubert.feyrer@rz.uni-regensburg.de>
+ *
+ * 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.
+ *
+ * Revision History:
+ * 26-Aug-00: robert.nagtegaal@phil.uu.nl and roland@tschai.demon.nl:
+ * various improvements
+ * 10-May-97: jwz@jwz.org: turned into a standalone program.
+ * 18-Apr-97: Memory leak fixed by Tom Schmidt <tschmidt@micron.com>
+ * 07-Apr-97: Modified by Dave Mitchell <davem@magnet.com>
+ * 23-Oct-94: Modified by David Bagley <bagleyd@bigfoot.com>
+ * random star sizes
+ * colors change depending on velocity
+ * 10-Oct-94: Add colors by Hubert Feyer
+ * 30-Sep-94: Initial port by Hubert Feyer
+ * 09-Mar-94: VMS can generate a random number 0.0 which results in a
+ * division by zero, corrected by Jouk Jansen
+ * <joukj@crys.chem.uva.nl>
+ */
+
+#ifdef STANDALONE
+# define DEFAULTS "*delay: 20000 \n" \
+ "*count: -5 \n" \
+ "*cycles: 250 \n" \
+ "*ncolors: 64 \n" \
+ "*fpsSolid: true \n" \
+ "*ignoreRotation: True \n" \
+ "*lowrez: True \n" \
+
+# define UNIFORM_COLORS
+# define release_galaxy 0
+# define reshape_galaxy 0
+# define galaxy_handle_event 0
+# include "xlockmore.h" /* from the xscreensaver distribution */
+#else /* !STANDALONE */
+# include "xlock.h" /* from the xlockmore distribution */
+#endif /* !STANDALONE */
+
+static Bool tracks;
+static Bool spin;
+static Bool dbufp;
+
+#define DEF_TRACKS "True"
+#define DEF_SPIN "True"
+#define DEF_DBUF "True"
+
+static XrmOptionDescRec opts[] =
+{
+ {"-tracks", ".galaxy.tracks", XrmoptionNoArg, "on"},
+ {"+tracks", ".galaxy.tracks", XrmoptionNoArg, "off"},
+ {"-spin", ".galaxy.spin", XrmoptionNoArg, "on"},
+ {"+spin", ".galaxy.spin", XrmoptionNoArg, "off"},
+ {"-dbuf", ".galaxy.dbuf", XrmoptionNoArg, "on"},
+ {"+dbuf", ".galaxy.dbuf", XrmoptionNoArg, "off"},
+};
+
+static argtype vars[] =
+{
+ {&tracks, "tracks", "Tracks", DEF_TRACKS, t_Bool},
+ {&spin, "spin", "Spin", DEF_SPIN, t_Bool},
+ {&dbufp, "dbuf", "Dbuf", DEF_DBUF, t_Bool},
+};
+
+static OptionStruct desc[] =
+{
+ {"-/+tracks", "turn on/off star tracks"},
+ {"-/+spin", "do/don't spin viewpoint"},
+ {"-/+dbuf", "turn on/off double buffering."},
+};
+
+ENTRYPOINT ModeSpecOpt galaxy_opts =
+{sizeof opts / sizeof opts[0], opts,
+ sizeof vars / sizeof vars[0], vars, desc};
+
+
+#define FLOATRAND ((double) LRAND() / ((double) MAXRAND))
+
+#if 0
+#define WRAP 1 /* Warp around edges */
+#define BOUNCE 1 /* Bounce from borders */
+#endif
+
+#define MINSIZE 1
+#define MINGALAXIES 2
+#define MAX_STARS 3000
+#define MAX_IDELTAT 50
+/* These come originally from the Cluster-version */
+#define DEFAULT_GALAXIES 3
+#define DEFAULT_STARS 1000
+#define DEFAULT_HITITERATIONS 7500
+#define DEFAULT_IDELTAT 200 /* 0.02 */
+#define EPSILON 0.00000001
+
+#define sqrt_EPSILON 0.0001
+
+#define DELTAT (MAX_IDELTAT * 0.0001)
+
+#define GALAXYRANGESIZE 0.1
+#define GALAXYMINSIZE 0.15
+#define QCONS 0.001
+
+
+#define COLORBASE 16
+/* colors per galaxy */
+/* #define COLORSTEP (NUMCOLORS/COLORBASE) */
+# define COLORSTEP (MI_NCOLORS(mi)/COLORBASE)
+
+
+typedef struct {
+ double pos[3], vel[3];
+} Star;
+
+
+typedef struct {
+ int mass;
+ int nstars;
+ Star *stars;
+ XPoint *oldpoints;
+ XPoint *newpoints;
+ double pos[3], vel[3];
+ int galcol;
+} Galaxy;
+
+typedef struct {
+ double mat[3][3]; /* Movement of stars(?) */
+ double scale; /* Scale */
+ int midx; /* Middle of screen, x */
+ int midy; /* Middle of screen, y */
+ double size; /* */
+ double diff[3]; /* */
+ Galaxy *galaxies; /* the Whole Universe */
+ int ngalaxies; /* # galaxies */
+ int f_hititerations; /* # iterations before restart */
+ int step; /* */
+ double rot_y; /* rotation of eye around center of universe, around
+y-axis*/
+ double rot_x; /* rotation of eye around center of universe, around
+x-axis */
+} unistruct;
+
+static unistruct *universes = NULL;
+
+ENTRYPOINT void
+free_galaxy(ModeInfo * mi)
+{
+ unistruct *gp = &universes[MI_SCREEN(mi)];
+ if (gp->galaxies != NULL) {
+ int i;
+
+ for (i = 0; i < gp->ngalaxies; i++) {
+ Galaxy *gt = &gp->galaxies[i];
+
+ if (gt->stars != NULL)
+ (void) free((void *) gt->stars);
+ if (gt->oldpoints != NULL)
+ (void) free((void *) gt->oldpoints);
+ if (gt->newpoints != NULL)
+ (void) free((void *) gt->newpoints);
+ }
+ (void) free((void *) gp->galaxies);
+ gp->galaxies = NULL;
+ }
+}
+
+static void
+startover(ModeInfo * mi)
+{
+ unistruct *gp = &universes[MI_SCREEN(mi)];
+ int i, j; /* more tmp */
+ double w1, w2; /* more tmp */
+ double d, v, w, h; /* yet more tmp */
+
+ gp->step = 0;
+ gp->rot_y = 0;
+ gp->rot_x = 0;
+
+ if (MI_BATCHCOUNT(mi) < -MINGALAXIES)
+ free_galaxy(mi);
+ gp->ngalaxies = MI_BATCHCOUNT(mi);
+ if (gp->ngalaxies < -MINGALAXIES)
+ gp->ngalaxies = NRAND(-gp->ngalaxies - MINGALAXIES + 1) + MINGALAXIES;
+
+ else if (gp->ngalaxies < MINGALAXIES)
+ gp->ngalaxies = MINGALAXIES;
+ if (gp->galaxies == NULL)
+ gp->galaxies = (Galaxy *) calloc(gp->ngalaxies, sizeof (Galaxy));
+
+ for (i = 0; i < gp->ngalaxies; ++i) {
+ Galaxy *gt = &gp->galaxies[i];
+ double sinw1, sinw2, cosw1, cosw2;
+
+ gt->galcol = NRAND(COLORBASE - 2);
+ if (gt->galcol > 1)
+ gt->galcol += 2; /* Mult 8; 16..31 no green stars */
+ /* Galaxies still may have some green stars but are not all green. */
+
+ if (gt->stars != NULL) {
+ (void) free((void *) gt->stars);
+ gt->stars = NULL;
+ }
+ gt->nstars = (NRAND(MAX_STARS / 2)) + MAX_STARS / 2;
+ gt->stars = (Star *) malloc(gt->nstars * sizeof (Star));
+ gt->oldpoints = (XPoint *) malloc(gt->nstars * sizeof (XPoint));
+ gt->newpoints = (XPoint *) malloc(gt->nstars * sizeof (XPoint));
+
+ w1 = 2.0 * M_PI * FLOATRAND;
+ w2 = 2.0 * M_PI * FLOATRAND;
+ sinw1 = SINF(w1);
+ sinw2 = SINF(w2);
+ cosw1 = COSF(w1);
+ cosw2 = COSF(w2);
+
+ gp->mat[0][0] = cosw2;
+ gp->mat[0][1] = -sinw1 * sinw2;
+ gp->mat[0][2] = cosw1 * sinw2;
+ gp->mat[1][0] = 0.0;
+ gp->mat[1][1] = cosw1;
+ gp->mat[1][2] = sinw1;
+ gp->mat[2][0] = -sinw2;
+ gp->mat[2][1] = -sinw1 * cosw2;
+ gp->mat[2][2] = cosw1 * cosw2;
+
+ gt->vel[0] = FLOATRAND * 2.0 - 1.0;
+ gt->vel[1] = FLOATRAND * 2.0 - 1.0;
+ gt->vel[2] = FLOATRAND * 2.0 - 1.0;
+ gt->pos[0] = -gt->vel[0] * DELTAT * gp->f_hititerations + FLOATRAND -
+0.5;
+ gt->pos[1] = -gt->vel[1] * DELTAT * gp->f_hititerations + FLOATRAND -
+0.5;
+ gt->pos[2] = -gt->vel[2] * DELTAT * gp->f_hititerations + FLOATRAND -
+0.5;
+
+ gt->mass = (int) (FLOATRAND * 1000.0) + 1;
+
+ gp->size = GALAXYRANGESIZE * FLOATRAND + GALAXYMINSIZE;
+
+ for (j = 0; j < gt->nstars; ++j) {
+ Star *st = &gt->stars[j];
+ XPoint *oldp = &gt->oldpoints[j];
+ XPoint *newp = &gt->newpoints[j];
+
+ double sinw, cosw;
+
+ w = 2.0 * M_PI * FLOATRAND;
+ sinw = SINF(w);
+ cosw = COSF(w);
+ d = FLOATRAND * gp->size;
+ h = FLOATRAND * exp(-2.0 * (d / gp->size)) / 5.0 * gp->size;
+ if (FLOATRAND < 0.5)
+ h = -h;
+ st->pos[0] = gp->mat[0][0] * d * cosw + gp->mat[1][0] * d * sinw +
+gp->mat[2][0] * h + gt->pos[0];
+ st->pos[1] = gp->mat[0][1] * d * cosw + gp->mat[1][1] * d * sinw +
+gp->mat[2][1] * h + gt->pos[1];
+ st->pos[2] = gp->mat[0][2] * d * cosw + gp->mat[1][2] * d * sinw +
+gp->mat[2][2] * h + gt->pos[2];
+
+ v = sqrt(gt->mass * QCONS / sqrt(d * d + h * h));
+ st->vel[0] = -gp->mat[0][0] * v * sinw + gp->mat[1][0] * v * cosw +
+gt->vel[0];
+ st->vel[1] = -gp->mat[0][1] * v * sinw + gp->mat[1][1] * v * cosw +
+gt->vel[1];
+ st->vel[2] = -gp->mat[0][2] * v * sinw + gp->mat[1][2] * v * cosw +
+gt->vel[2];
+
+ st->vel[0] *= DELTAT;
+ st->vel[1] *= DELTAT;
+ st->vel[2] *= DELTAT;
+
+ oldp->x = 0;
+ oldp->y = 0;
+ newp->x = 0;
+ newp->y = 0;
+ }
+
+ }
+
+ XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
+
+#if 0
+ (void) printf("ngalaxies=%d, f_hititerations=%d\n", gp->ngalaxies,
+gp->f_hititerations);
+ (void) printf("f_deltat=%g\n", DELTAT);
+ (void) printf("Screen: ");
+#endif /*0 */
+}
+
+ENTRYPOINT void
+init_galaxy(ModeInfo * mi)
+{
+ unistruct *gp;
+
+ MI_INIT (mi, universes);
+ gp = &universes[MI_SCREEN(mi)];
+
+# ifdef HAVE_JWXYZ /* Don't second-guess Quartz's double-buffering */
+ dbufp = False;
+# endif
+
+ gp->f_hititerations = MI_CYCLES(mi);
+
+ gp->scale = (double) (MI_WIN_WIDTH(mi) + MI_WIN_HEIGHT(mi)) / 8.0;
+ gp->midx = MI_WIN_WIDTH(mi) / 2;
+ gp->midy = MI_WIN_HEIGHT(mi) / 2;
+ startover(mi);
+}
+
+ENTRYPOINT void
+draw_galaxy(ModeInfo * mi)
+{
+ Display *display = MI_DISPLAY(mi);
+ Window window = MI_WINDOW(mi);
+ GC gc = MI_GC(mi);
+ unistruct *gp = &universes[MI_SCREEN(mi)];
+ double d, eps, cox, six, cor, sir; /* tmp */
+ int i, j, k; /* more tmp */
+ XPoint *dummy = NULL;
+
+ if (! dbufp)
+ XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
+
+ if(spin){
+ gp->rot_y += 0.01;
+ gp->rot_x += 0.004;
+ }
+
+ cox = COSF(gp->rot_y);
+ six = SINF(gp->rot_y);
+ cor = COSF(gp->rot_x);
+ sir = SINF(gp->rot_x);
+
+ eps = 1/(EPSILON * sqrt_EPSILON * DELTAT * DELTAT * QCONS);
+
+ for (i = 0; i < gp->ngalaxies; ++i) {
+ Galaxy *gt = &gp->galaxies[i];
+
+ for (j = 0; j < gp->galaxies[i].nstars; ++j) {
+ Star *st = &gt->stars[j];
+ XPoint *newp = &gt->newpoints[j];
+ double v0 = st->vel[0];
+ double v1 = st->vel[1];
+ double v2 = st->vel[2];
+
+ for (k = 0; k < gp->ngalaxies; ++k) {
+ Galaxy *gtk = &gp->galaxies[k];
+ double d0 = gtk->pos[0] - st->pos[0];
+ double d1 = gtk->pos[1] - st->pos[1];
+ double d2 = gtk->pos[2] - st->pos[2];
+
+ d = d0 * d0 + d1 * d1 + d2 * d2;
+ if (d > EPSILON)
+ d = gtk->mass / (d * sqrt(d)) * DELTAT * DELTAT * QCONS;
+ else
+ d = gtk->mass / (eps * sqrt(eps));
+ v0 += d0 * d;
+ v1 += d1 * d;
+ v2 += d2 * d;
+ }
+
+ st->vel[0] = v0;
+ st->vel[1] = v1;
+ st->vel[2] = v2;
+
+ st->pos[0] += v0;
+ st->pos[1] += v1;
+ st->pos[2] += v2;
+
+ newp->x = (short) (((cox * st->pos[0]) - (six * st->pos[2])) *
+ gp->scale) + gp->midx;
+ newp->y = (short) (((cor * st->pos[1]) - (sir * ((six * st->pos[0]) +
+ (cox * st->pos[2]))))
+ * gp->scale) + gp->midy;
+
+ }
+
+ for (k = i + 1; k < gp->ngalaxies; ++k) {
+ Galaxy *gtk = &gp->galaxies[k];
+ double d0 = gtk->pos[0] - gt->pos[0];
+ double d1 = gtk->pos[1] - gt->pos[1];
+ double d2 = gtk->pos[2] - gt->pos[2];
+
+ d = d0 * d0 + d1 * d1 + d2 * d2;
+ if (d > EPSILON)
+ d = 1 / (d * sqrt(d)) * DELTAT * QCONS;
+ else
+ d = 1 / (EPSILON * sqrt_EPSILON) * DELTAT * QCONS;
+
+ d0 *= d;
+ d1 *= d;
+ d2 *= d;
+ gt->vel[0] += d0 * gtk->mass;
+ gt->vel[1] += d1 * gtk->mass;
+ gt->vel[2] += d2 * gtk->mass;
+ gtk->vel[0] -= d0 * gt->mass;
+ gtk->vel[1] -= d1 * gt->mass;
+ gtk->vel[2] -= d2 * gt->mass;
+ }
+
+ gt->pos[0] += gt->vel[0] * DELTAT;
+ gt->pos[1] += gt->vel[1] * DELTAT;
+ gt->pos[2] += gt->vel[2] * DELTAT;
+
+ if (dbufp) {
+ XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi));
+ XDrawPoints(display, window, gc, gt->oldpoints, gt->nstars,
+ CoordModeOrigin);
+ }
+ XSetForeground(display, gc, MI_PIXEL(mi, COLORSTEP * gt->galcol));
+ XDrawPoints(display, window, gc, gt->newpoints, gt->nstars,
+ CoordModeOrigin);
+
+ dummy = gt->oldpoints;
+ gt->oldpoints = gt->newpoints;
+ gt->newpoints = dummy;
+ }
+
+ gp->step++;
+ if (gp->step > gp->f_hititerations * 4)
+ startover(mi);
+}
+
+#ifndef STANDALONE
+ENTRYPOINT void
+refresh_galaxy(ModeInfo * mi)
+{
+ /* Do nothing, it will refresh by itself */
+}
+#endif
+
+XSCREENSAVER_MODULE ("Galaxy", galaxy)
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