+++ /dev/null
-/* -*- Mode: C; tab-width: 4 -*- */
-/* galaxy --- spinning galaxies */
-
-#if !defined( lint ) && !defined( SABER )
-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:
- * 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 PROGCLASS "Galaxy"
-# define HACK_INIT init_galaxy
-# define HACK_DRAW draw_galaxy
-# define galaxy_opts xlockmore_opts
-# define DEFAULTS "*delay: 100 \n" \
- "*count: -5 \n" \
- "*cycles: 250 \n" \
- "*size: -3 \n" \
- "*ncolors: 64 \n"
-# define UNIFORM_COLORS
-# include "xlockmore.h" /* from the xscreensaver distribution */
-#else /* !STANDALONE */
-# include "xlock.h" /* from the xlockmore distribution */
-#endif /* !STANDALONE */
-
-static Bool tracks;
-
-#define DEF_TRACKS "False"
-
-static XrmOptionDescRec opts[] =
-{
- {"-tracks", ".galaxy.tracks", XrmoptionNoArg, (caddr_t) "on"},
- {"+tracks", ".galaxy.tracks", XrmoptionNoArg, (caddr_t) "off"}
-};
-
-static argtype vars[] =
-{
- {(caddr_t *) & tracks, "tracks", "Tracks", DEF_TRACKS, t_Bool}
-};
-
-static OptionStruct desc[] =
-{
- {"-/+tracks", "turn on/off star tracks"}
-};
-
-ModeSpecOpt galaxy_opts = { 2, opts, 1, 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 1
-#define MAX_STARS 300
-#define MAX_IDELTAT 50
-/* These come originally from the Cluster-version */
-#define DEFAULT_GALAXIES 2
-#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 0.1
-#define QCONS 0.001
-
-/*-
- * The following is enabled, it does not look that good for some.
- * (But it looks great for me.) Maybe velocities should be measured
- * relative to their galaxy-centers instead of absolute.
- */
-#if 0
-#undef NO_VELOCITY_COLORING */ /* different colors for different speeds */
-#endif
-
-#define COLORBASE 8
- /* Colors for stars start here */
-#define COLORSTEP (NUMCOLORS/COLORBASE) /* 8 colors per galaxy */
-
-#define drawStar(x,y,size) if(size<=1) XDrawPoint(display,window,gc,x,y);\
- else XFillArc(display,window,gc,x,y,size,size,0,23040)
-
-typedef struct {
- double pos[3], vel[3];
- int px, py;
- int color;
- int size;
-} Star;
-
-typedef struct {
- int mass;
- int nstars;
- Star *stars;
- double pos[3], vel[3];
- int galcol;
-} Galaxy;
-
-typedef struct {
- struct {
- int left; /* x minimum */
- int right; /* x maximum */
- int top; /* y minimum */
- int bottom; /* y maximum */
- } clip;
- 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; /* */
-} unistruct;
-
-static unistruct *universes = NULL;
-
-static void
-free_galaxies(unistruct * gp)
-{
- 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);
- }
- (void) free((void *) gp->galaxies);
- gp->galaxies = NULL;
- }
-}
-
-static void
-startover(ModeInfo * mi)
-{
- unistruct *gp = &universes[MI_SCREEN(mi)];
- int size = MI_SIZE(mi);
- int i, j; /* more tmp */
- double w1, w2; /* more tmp */
- double d, v, w, h; /* yet more tmp */
-
- gp->step = 0;
-
- if (MI_BATCHCOUNT(mi) < -MINGALAXIES)
- free_galaxies(gp);
- 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));
- 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 = >->stars[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;
-
- st->px = 0;
- st->py = 0;
-
- if (size < -MINSIZE)
- st->size = NRAND(-size - MINSIZE + 1) + MINSIZE;
- else if (size < MINSIZE)
- st->size = MINSIZE;
- else
- st->size = size;
- }
- }
-
- 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: ");
- (void) printf("%dx%d pixel (%d-%d, %d-%d)\n",
- (gp->clip.right - gp->clip.left), (gp->clip.bottom - gp->clip.top),
- gp->clip.left, gp->clip.right, gp->clip.top, gp->clip.bottom);
-#endif /*0 */
-}
-
-void
-init_galaxy(ModeInfo * mi)
-{
- unistruct *gp;
-
- if (universes == NULL) {
- if ((universes = (unistruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (unistruct))) == NULL)
- return;
- }
- gp = &universes[MI_SCREEN(mi)];
-
- gp->f_hititerations = MI_CYCLES(mi);
-
- gp->clip.left = 0;
- gp->clip.top = 0;
- gp->clip.right = MI_WIN_WIDTH(mi);
- gp->clip.bottom = MI_WIN_HEIGHT(mi);
-
- gp->scale = (double) (gp->clip.right + gp->clip.bottom) / 8.0;
- gp->midx = gp->clip.right / 2;
- gp->midy = gp->clip.bottom / 2;
- startover(mi);
-}
-
-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; /* tmp */
- int i, j, k; /* more tmp */
-
- for (i = 0; i < gp->ngalaxies; ++i) {
- Galaxy *gt = &gp->galaxies[i];
-
- for (j = 0; j < gp->galaxies[i].nstars; ++j) {
- Star *st = >->stars[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 = gt->mass / (d * sqrt(d)) * DELTAT * DELTAT * QCONS;
- else
- d = gt->mass / (EPSILON * sqrt_EPSILON) * DELTAT * DELTAT * QCONS;
- v0 += d0 * d;
- v1 += d1 * d;
- v2 += d2 * d;
- }
-
- st->vel[0] = v0;
- st->vel[1] = v1;
- st->vel[2] = v2;
-
-#ifndef NO_VELOCITY_COLORING
- d = (v0 * v0 + v1 * v1 + v2 * v2) / (3.0 * DELTAT * DELTAT);
- if (d > (double) COLORSTEP)
- st->color = COLORSTEP * gt->galcol + COLORSTEP - 1;
- else
- st->color = COLORSTEP * gt->galcol + ((int) d) % COLORSTEP;
-#endif
- st->pos[0] += v0;
- st->pos[1] += v1;
- st->pos[2] += v2;
-
- if (st->px >= gp->clip.left &&
- st->px <= gp->clip.right - st->size &&
- st->py >= gp->clip.top &&
- st->py <= gp->clip.bottom - st->size) {
- XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi));
- drawStar(st->px, st->py, st->size);
- }
- st->px = (int) (st->pos[0] * gp->scale) + gp->midx;
- st->py = (int) (st->pos[1] * gp->scale) + gp->midy;
-
-
-#ifdef WRAP
- if (st->px < gp->clip.left) {
- (void) printf("wrap l -> r\n");
- st->px = gp->clip.right;
- }
- if (st->px > gp->clip.right) {
- (void) printf("wrap r -> l\n");
- st->px = gp->clip.left;
- }
- if (st->py > gp->clip.bottom) {
- (void) printf("wrap b -> t\n");
- st->py = gp->clip.top;
- }
- if (st->py < gp->clip.top) {
- (void) printf("wrap t -> b\n");
- st->py = gp->clip.bottom;
- }
-#endif /*WRAP */
-
-
- if (st->px >= gp->clip.left &&
- st->px <= gp->clip.right - st->size &&
- st->py >= gp->clip.top &&
- st->py <= gp->clip.bottom - st->size) {
- if (MI_NPIXELS(mi) > 2)
-#ifdef NO_VELOCITY_COLORING
- XSetForeground(display, gc, MI_PIXEL(mi, COLORSTEP * gt->galcol));
-#else
- XSetForeground(display, gc, MI_PIXEL(mi, st->color));
-#endif
- else
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
- if (tracks)
- drawStar(st->px + 1, st->py, st->size);
- else
- drawStar(st->px, st->py, st->size);
- }
- }
-
- 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 = gt->mass * gt->mass / (d * sqrt(d)) * DELTAT * QCONS;
- else
- d = gt->mass * gt->mass / (EPSILON * sqrt_EPSILON) * DELTAT * QCONS;
- d0 *= d;
- d1 *= d;
- d2 *= d;
- gt->vel[0] += d0 / gt->mass;
- gt->vel[1] += d1 / gt->mass;
- gt->vel[2] += d2 / gt->mass;
- gtk->vel[0] -= d0 / gtk->mass;
- gtk->vel[1] -= d1 / gtk->mass;
- gtk->vel[2] -= d2 / gtk->mass;
- }
- gt->pos[0] += gt->vel[0] * DELTAT;
- gt->pos[1] += gt->vel[1] * DELTAT;
- gt->pos[2] += gt->vel[2] * DELTAT;
- }
-
- gp->step++;
- if (gp->step > gp->f_hititerations * 4)
- startover(mi);
-}
-
-void
-release_galaxy(ModeInfo * mi)
-{
- if (universes != NULL) {
- int screen;
-
- for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
- free_galaxies(&universes[screen]);
- (void) free((void *) universes);
- universes = NULL;
- }
-}
-
-void
-refresh_galaxy(ModeInfo * mi)
-{
- /* Do nothing, it will refresh by itself */
-}
projects / xscreensaver / blobdiff