C++ MI_HEIGHT函数代码示例

ENTRYPOINT void init_antmaze(ModeInfo * mi) 
{
  double rot_speed = 0.3;
  int i;

  antmazestruct *mp;
  
  if (antmaze == NULL) {
	if ((antmaze = (antmazestruct *) calloc(MI_NUM_SCREENS(mi),
						sizeof (antmazestruct))) == NULL)
	  return;
  }
  mp = &antmaze[MI_SCREEN(mi)];
  mp->step = NRAND(90);
  mp->ant_position = NRAND(90);


  mp->antdirection[0] = PI/2.0;
  mp->antdirection[1] = PI/2.0;
  mp->antdirection[2] = 0;
  mp->antdirection[3] = PI/2.0;
  mp->antdirection[4] = PI/2.0;

  mp->antposition[0][0] = -4.0;
  mp->antposition[0][1] =  5.0;
  mp->antposition[0][1] =  0.15;

  mp->antposition[1][0] = -4.0;
  mp->antposition[1][1] =  3.0;
  mp->antposition[1][1] =  0.15;

  mp->antposition[2][0] = -1.0;
  mp->antposition[2][1] = -2.0;
  mp->antposition[2][1] =  0.15;

  mp->antposition[3][0] = -3.9;
  mp->antposition[3][1] =  6.0;
  mp->antposition[3][1] =  0.15;

  mp->antposition[4][0] =  2.0;
  mp->antposition[4][1] = -2.0;
  mp->antposition[4][1] =  0.15;

  

  for (i = 0; i < ANTCOUNT; i++) {
    mp->antvelocity[i] = 0.02;
    mp->antsize[i] = 1.0;
    mp->anton[i] = 0;
  }

  mp->bposition[0][0] = 0;
  mp->bposition[0][1] = 8;

  mp->bposition[1][0] = 9;
  mp->bposition[1][1] = 1;

  mp->bposition[2][0] = 1;
  mp->bposition[2][1] = 1;

  mp->bposition[3][0] = 4;
  mp->bposition[3][1] = 8;

  mp->bposition[4][0] = 2;
  mp->bposition[4][1] = 1;

  mp->part[0] = 0;
  mp->part[1] = 1;
  mp->part[2] = 5;
  mp->part[3] = 1;
  mp->part[4] = 3;

  mp->introduced = 0;
  mp->entroducing = 12;
  mp->fadeout = 1.0;
  mp->mag = 4.0;

  mp->rot = make_rotator (rot_speed, rot_speed, rot_speed, 1, 0, True);
  mp->trackball = gltrackball_init ();
  
  if ((mp->glx_context = init_GL(mi)) != NULL) {
    reshape_antmaze(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
    glDrawBuffer(GL_BACK);
    pinit(mp);
  } 
  else
    MI_CLEARWINDOW(mi);
}

ENTRYPOINT void
init_rotor (ModeInfo * mi)
{
	int         x;
	elem       *pelem;
	unsigned char wasiconified;
	rotorstruct *rp;

	if (rotors == NULL) {
		if ((rotors = (rotorstruct *) calloc(MI_NUM_SCREENS(mi),
					      sizeof (rotorstruct))) == NULL)
			return;
	}
	rp = &rotors[MI_SCREEN(mi)];

#ifdef HAVE_COCOA
    jwxyz_XSetAntiAliasing (MI_DISPLAY(mi), MI_GC(mi),  False);
#endif

	rp->prevcenterx = rp->centerx;
	rp->prevcentery = rp->centery;

	rp->centerx = MI_WIDTH(mi) / 2;
	rp->centery = MI_HEIGHT(mi) / 2;

	rp->redrawing = 0;
	/*
	 * sometimes, you go into iconified view, only to see a really whizzy pattern
	 * that you would like to look more closely at. Normally, clicking in the
	 * icon reinitializes everything - but I don't, cuz I'm that kind of guy.
	 * HENCE, the wasiconified stuff you see here.
	 */

	wasiconified = rp->iconifiedscreen;
	rp->iconifiedscreen = MI_IS_ICONIC(mi);

	if (wasiconified && !rp->iconifiedscreen)
		rp->firsttime = True;
	else {

		/* This is a fudge is needed since prevcenter may not be set when it comes
		   from the the random mode and return is pressed (and its not the first
		   mode that was running). This assumes that the size of the lock screen
		   window / size of the icon window = 12 */
		if (!rp->prevcenterx)
			rp->prevcenterx = rp->centerx * 12;
		if (!rp->prevcentery)
			rp->prevcentery = rp->centery * 12;

		rp->num = MI_COUNT(mi);
		if (rp->num < 0) {
			rp->num = NRAND(-rp->num) + 1;
			if (rp->elements != NULL) {
				(void) free((void *) rp->elements);
				rp->elements = (elem *) NULL;
			}
		}
		if (rp->elements == NULL)
			if ((rp->elements = (elem *) calloc(rp->num,
					sizeof (elem))) == NULL) {
				free_rotor(rp);
				return;
			}
		rp->nsave = MI_CYCLES(mi);
		if (rp->nsave <= 1)
			rp->nsave = 2;
		if (rp->save == NULL)
			if ((rp->save = (XPoint *) malloc(rp->nsave *
					sizeof (XPoint))) == NULL) {
				free_rotor(rp);
				return;
			}
		for (x = 0; x < rp->nsave; x++) {
			rp->save[x].x = rp->centerx;
			rp->save[x].y = rp->centery;
		}

		pelem = rp->elements;

		for (x = rp->num; --x >= 0; pelem++) {
			pelem->radius_drift_max = 1.0;
			pelem->radius_drift_now = 1.0;

			pelem->end_radius = 100.0;

			pelem->ratio_drift_max = 1.0;
			pelem->ratio_drift_now = 1.0;
			pelem->end_ratio = 10.0;
		}
		if (MI_NPIXELS(mi) > 2)
			rp->pix = NRAND(MI_NPIXELS(mi));

		rp->rotor = 0;
		rp->prev = 1;
		rp->lastx = rp->centerx;
		rp->lasty = rp->centery;
		rp->angle = (float) NRAND((long) MAXANGLE) / 3.0;
		rp->forward = rp->firsttime = True;
	}
	rp->linewidth = MI_SIZE(mi);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        break;
    case 3:
        /*
          x' = -z + b sin(y)
          y' = c
          z' = 0.7x + az(0.1 - x^2)
         */
        name = "Birkhoff";
        sp->par2[Z].x = -1;
        sp->par2[SINY].x = 0.35 + balance_rand(0.25); /* b */
        sp->par2[C].y = 1.57; /* c */
        sp->par2[X].z = 0.7;
        sp->par2[Z].z = 1 + balance_rand(0.5); /* a/10 */
        sp->par2[XXZ].z = -10 * sp->par2[Z].z; /* -a */
        sp->yperiod = 2 * M_PI;
        break;
    default:
        /*
          x' = -ax - z/2 - z^3/8 + b sin(y)
          y' = c
          z' = 2x
         */
        name = "Duffing";
        sp->par2[X].x = -0.2 + balance_rand(0.1); /* a */
        sp->par2[Z].x = -0.5;
        sp->par2[ZZZ].x = -0.125;
        sp->par2[SINY].x = 27.0 + balance_rand(3.0); /* b */
        sp->par2[C].y = 1.33; /* c */
        sp->par2[X].z = 2;
        sp->yperiod = 2 * M_PI;
        break;

    }

    sp->range.x = 5;
    sp->range.z = 5;

    if(sp->yperiod > 0) {
        sp->ODE = Periodic;
        /* periodic flows show either uniform distribution or a
           snapshot on the 'time' axis */
        sp->range.y = NRAND(2)? sp->yperiod : 0;
    } else {
        sp->range.y = 5;
        sp->ODE = Cubic;
    }

    /* Run discoverer to set up bounding box, etc.  Lyapunov will
       probably be innaccurate, since we're only running it once, but
       we're using known strange attractors so it should be ok. */
    discover(mi);
    if(MI_IS_VERBOSE(mi))
        fprintf(stdout,
                "flow: Lyapunov exponent: %g, step: %g, size: %g (%s)\n",
                sp->lyap2, sp->step2, sp->size2, name);
    /* Install new params */
    sp->lyap = sp->lyap2;
    sp->size = sp->size2;
    sp->mid = sp->mid2;
    sp->step = sp->step2;
    memcpy(sp->par, sp->par2, sizeof(sp->par2));

    sp->count2 = 0; /* Reset search */

    free_flow(sp);
    sp->beecount = MI_COUNT(mi);
    if (sp->beecount < 0) {	/* random variations */
        sp->beecount = NRAND(-sp->beecount) + 1; /* Minimum 1 */
    }

# ifdef HAVE_COCOA	/* Don't second-guess Quartz's double-buffering */
    dbufp = False;
# endif

    if(dbufp) { /* Set up double buffer */
        if (sp->buffer != None)
            XFreePixmap(MI_DISPLAY(mi), sp->buffer);
        sp->buffer = XCreatePixmap(MI_DISPLAY(mi), MI_WINDOW(mi),
                                   MI_WIDTH(mi), MI_HEIGHT(mi), MI_DEPTH(mi));
    } else {
        sp->buffer = MI_WINDOW(mi);
    }
    /* no "NoExpose" events from XCopyArea wanted */
    XSetGraphicsExposures(MI_DISPLAY(mi), MI_GC(mi), False);

    /* Make sure we're using 'thin' lines */
    XSetLineAttributes(MI_DISPLAY(mi), MI_GC(mi), 0, LineSolid, CapNotLast,
                       JoinMiter);

    /* Clear the background (may be slow depending on user prefs). */
    MI_CLEARWINDOW(mi);

    /* Allocate memory. */
    if (sp->csegs == NULL) {
        allocate(sp->csegs, XSegment,
                 (sp->beecount + BOX_L) * MI_NPIXELS(mi) * sp->taillen);
        allocate(sp->cnsegs, int, MI_NPIXELS(mi));
        allocate(sp->old_segs, XSegment, sp->beecount * sp->taillen);
        allocate(sp->p, dvector, sp->beecount * sp->taillen);
    }

void
init_tik_tak(ModeInfo * mi)
{
	Display    *display = MI_DISPLAY(mi);
	Window      window = MI_WINDOW(mi);
	int         i, max_objects, size_object;
	tik_takstruct *tiktak;

/* initialize */
	if (tik_taks == NULL) {
		if ((tik_taks = (tik_takstruct *) calloc(MI_NUM_SCREENS(mi),
				sizeof (tik_takstruct))) == NULL)
			return;
	}
	tiktak = &tik_taks[MI_SCREEN(mi)];
	tiktak->mi = mi;

	if (tiktak->gc == None) {
		if (MI_IS_INSTALL(mi) && MI_NPIXELS(mi) > 2) {
			XColor      color;

#ifndef STANDALONE
			tiktak->fg = MI_FG_PIXEL(mi);
			tiktak->bg = MI_BG_PIXEL(mi);
#endif
			tiktak->blackpixel = MI_BLACK_PIXEL(mi);
			tiktak->whitepixel = MI_WHITE_PIXEL(mi);
			if ((tiktak->cmap = XCreateColormap(display, window,
					MI_VISUAL(mi), AllocNone)) == None) {
				free_tik_tak(display, tiktak);
				return;
			}
			XSetWindowColormap(display, window, tiktak->cmap);
			(void) XParseColor(display, tiktak->cmap, "black", &color);
			(void) XAllocColor(display, tiktak->cmap, &color);
			MI_BLACK_PIXEL(mi) = color.pixel;
			(void) XParseColor(display, tiktak->cmap, "white", &color);
			(void) XAllocColor(display, tiktak->cmap, &color);
			MI_WHITE_PIXEL(mi) = color.pixel;
#ifndef STANDALONE
			(void) XParseColor(display, tiktak->cmap, background, &color);
			(void) XAllocColor(display, tiktak->cmap, &color);
			MI_BG_PIXEL(mi) = color.pixel;
			(void) XParseColor(display, tiktak->cmap, foreground, &color);
			(void) XAllocColor(display, tiktak->cmap, &color);
			MI_FG_PIXEL(mi) = color.pixel;
#endif
			tiktak->colors = (XColor *) NULL;
			tiktak->ncolors = 0;
		}
		if ((tiktak->gc = XCreateGC(display, MI_WINDOW(mi),
			     (unsigned long) 0, (XGCValues *) NULL)) == None) {
			free_tik_tak(display, tiktak);
			return;
		}
	}
/* Clear Display */
	MI_CLEARWINDOW(mi);
	tiktak->painted = False;
	XSetFunction(display, tiktak->gc, GXxor);


/*Set up tik_tak data */
	tiktak->direction = (LRAND() & 1) ? 1 : -1;
	tiktak->win_width = MI_WIDTH(mi);
	tiktak->win_height = MI_HEIGHT(mi);
	tiktak->num_object = MI_COUNT(mi);
        tiktak->x0 = tiktak->win_width / 2;
        tiktak->y0 = tiktak->win_height / 2;
	max_objects = MI_COUNT(mi);
	if (tiktak->num_object == 0) {
		tiktak->num_object = DEF_NUM_OBJECT;
		max_objects = DEF_NUM_OBJECT;
	} else if (tiktak->num_object < 0) {
		max_objects = -tiktak->num_object;
		tiktak->num_object = NRAND(-tiktak->num_object) + 1;
	}
	if (tiktak->object == NULL)
		if ((tiktak->object = (tik_takobject *) calloc(max_objects,
				sizeof (tik_takobject))) == NULL) {
			free_tik_tak(display, tiktak);
			return;
		}
	size_object = MIN( tiktak->win_width , tiktak->win_height) / 3;
	if ( abs( MI_SIZE(mi) ) > size_object) {
	   if ( MI_SIZE( mi ) < 0 )
	     {
		size_object = -size_object;
	     }
	}
   else
     {
	size_object = MI_SIZE(mi);
     }
	if (MI_IS_INSTALL(mi) && MI_NPIXELS(mi) > 2) {
/* Set up colour map */
		if (tiktak->colors != NULL) {
			if (tiktak->ncolors && !tiktak->no_colors)
				free_colors(display, tiktak->cmap, tiktak->colors, tiktak->ncolors);
			free(tiktak->colors);
//.........这里部分代码省略.........

ENTRYPOINT void
init_planet (ModeInfo * mi)
{
  planetstruct *gp;
  int screen = MI_SCREEN(mi);
  Bool wire = MI_IS_WIREFRAME(mi);

  if (planets == NULL) {
	if ((planets = (planetstruct *) calloc(MI_NUM_SCREENS(mi),
										  sizeof (planetstruct))) == NULL)
	  return;
  }
  gp = &planets[screen];

  if ((gp->glx_context = init_GL(mi)) != NULL) {
	reshape_planet(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
  }

  {
	//char *f = get_string_resource(mi->dpy, "imageForeground", "Foreground");
	//char *b = get_string_resource(mi->dpy, "imageBackground", "Background");
	char *f = _strdup(imageForeground);
	char *b = _strdup(imageBackground);
	char *s;
	if (!f) f = _strdup("white");
	if (!b) b = _strdup("black");
	
	for (s = f + strlen(f)-1; s > f; s--)
	  if (*s == ' ' || *s == '\t')
		*s = 0;
	for (s = b + strlen(b)-1; s > b; s--)
	  if (*s == ' ' || *s == '\t')
		*s = 0;

    if (!XParseColor(mi->dpy, mi->xgwa.colormap, f, &gp->fg))
      {
		fprintf(stderr, "%s: unparsable color: \"%s\"\n", progname, f);
		exit(1);
      }
    if (!XParseColor(mi->dpy, mi->xgwa.colormap, b, &gp->bg))
      {
		fprintf(stderr, "%s: unparsable color: \"%s\"\n", progname, f);
		exit(1);
      }

	free (f);
	free (b);
  }

  {
    double spin_speed   = 0.5;
    double wander_speed = 0.02;
    gp->rot = make_rotator (do_roll ? spin_speed : 0,
                            do_roll ? spin_speed : 0,
                            0, 1,
                            do_wander ? wander_speed : 0,
                            True);
    gp->z = frand (1.0);
    gp->trackball = gltrackball_init ();
  }

  if (wire)
    {
      do_texture = False;
      do_light = False;
    }

  if (do_texture)
    setup_texture (mi);

  if (do_light)
	init_sun (mi);

  if (do_stars)
    init_stars (mi);

  if (random() & 1)
    star_spin = -star_spin;

  /* construct the polygons of the planet
   */
  gp->platelist = glGenLists(1);
  glNewList (gp->platelist, GL_COMPILE);
  glColor3f (1,1,1);
  glPushMatrix ();
  glScalef (RADIUS, RADIUS, RADIUS);
  glRotatef (90, 1, 0, 0);
  glFrontFace(GL_CCW);
  unit_sphere (resolution, resolution, wire);
  glPopMatrix ();
  glEndList();

  /* construct the polygons of the latitude/longitude/axis lines.
   */
  gp->latlonglist = glGenLists(1);
  glNewList (gp->latlonglist, GL_COMPILE);
  glPushMatrix ();
  glDisable (GL_TEXTURE_2D);
  glDisable (GL_LIGHTING);
  glDisable (GL_LINE_SMOOTH);
//.........这里部分代码省略.........

ENTRYPOINT void
init_laser(ModeInfo * mi)
{
    Display *display = MI_DISPLAY(mi);
    int         i, c = 0;
    lasersstruct *lp;

    if (lasers == NULL) {
        if ((lasers = (lasersstruct *) calloc(MI_NUM_SCREENS(mi),
                                              sizeof (lasersstruct))) == NULL)
            return;
    }
    lp = &lasers[MI_SCREEN(mi)];

    lp->width = MI_WIDTH(mi);
    lp->height = MI_HEIGHT(mi);
    lp->time = 0;

    lp->ln = MI_COUNT(mi);
    if (lp->ln < -MINLASER) {
        /* if lp->ln is random ... the size can change */
        if (lp->laser != NULL) {
            (void) free((void *) lp->laser);
            lp->laser = (laserstruct *) NULL;
        }
        lp->ln = NRAND(-lp->ln - MINLASER + 1) + MINLASER;
    } else if (lp->ln < MINLASER)
        lp->ln = MINLASER;

    if (lp->laser == NULL) {
        if ((lp->laser = (laserstruct *) malloc(lp->ln *
                                                sizeof (laserstruct))) == NULL) {
            free_laser(display, lp);
            return;
        }
    }
    if (lp->stippledGC == None) {
        XGCValues   gcv;

        gcv.foreground = MI_WHITE_PIXEL(mi);
        gcv.background = MI_BLACK_PIXEL(mi);
        lp->gcv_black.foreground = MI_BLACK_PIXEL(mi);
        if ((lp->stippledGC = XCreateGC(display, MI_WINDOW(mi),
                                        GCForeground | GCBackground, &gcv)) == None) {
            free_laser(display, lp);
            return;
        }
# ifdef HAVE_JWXYZ
        jwxyz_XSetAntiAliasing (MI_DISPLAY(mi), lp->stippledGC, False);
# endif
    }
    MI_CLEARWINDOW(mi);

    if (MINDIST < lp->width - MINDIST)
        lp->cx = RANGE_RAND(MINDIST, lp->width - MINDIST);
    else
        lp->cx = RANGE_RAND(0, lp->width);
    if (MINDIST < lp->height - MINDIST)
        lp->cy = RANGE_RAND(MINDIST, lp->height - MINDIST);
    else
        lp->cy = RANGE_RAND(0, lp->height);
    lp->lw = RANGE_RAND(MINWIDTH, MAXWIDTH);
    lp->lr = RANGE_RAND(MINREDRAW, MAXREDRAW);
    lp->sw = 0;
    lp->so = 0;

    if (MI_NPIXELS(mi) > 2)
        c = NRAND(MI_NPIXELS(mi));

    for (i = 0; i < lp->ln; i++) {
        laserstruct *l = &lp->laser[i];

        l->bn = (border) NRAND(4);

        switch (l->bn) {
        case TOP:
            l->bx = NRAND(lp->width);
            l->by = 0;
            break;
        case RIGHT:
            l->bx = lp->width;
            l->by = NRAND(lp->height);
            break;
        case BOTTOM:
            l->bx = NRAND(lp->width);
            l->by = lp->height;
            break;
        case LEFT:
            l->bx = 0;
            l->by = NRAND(lp->height);
        }

        l->dir = (int) (LRAND() & 1);
        l->speed = ((RANGE_RAND(MINSPEED, MAXSPEED) * lp->width) / 1000) + 1;
        if (MI_NPIXELS(mi) > 2) {
            l->gcv.foreground = MI_PIXEL(mi, c);
            c = (c + COLORSTEP) % MI_NPIXELS(mi);
        } else
            l->gcv.foreground = MI_WHITE_PIXEL(mi);
    }
//.........这里部分代码省略.........

ENTRYPOINT void init_blocktube (ModeInfo *mi)
{
    int loop;
    GLfloat fogColor[4] = {0,0,0,1};
    blocktube_configuration *lp;
    int wire = MI_IS_WIREFRAME(mi);

    if (!lps) {
        lps = (blocktube_configuration *)
              calloc (MI_NUM_SCREENS(mi), sizeof (blocktube_configuration));
        if (!lps) {
            fprintf(stderr, "%s: out of memory\n", progname);
            exit(1);
        }
        lp = &lps[MI_SCREEN(mi)];
    }

    lp = &lps[MI_SCREEN(mi)];
    lp->glx_context = init_GL(mi);

    lp->zoom = 30;
    lp->tilt = 4.5;
    lp->tunnelLength = 200;
    lp->tunnelWidth = 5;

    if (wire) {
        do_fog = False;
        do_texture = False;
        glLineWidth(2);
    }

    lp->block_dlist = glGenLists (1);
    glNewList (lp->block_dlist, GL_COMPILE);
    lp->polys = cube_vertices(0.15, 1.2, 5.25, wire);
    glEndList ();

#if defined( I_HAVE_XPM )
    if (do_texture) {
        if (!LoadGLTextures(mi)) {
            fprintf(stderr, "%s: can't load textures!\n", progname);
            exit(1);
        }
        glEnable(GL_TEXTURE_2D);
    }
#endif

    /* kick on the fog machine */
    if (do_fog) {
        glEnable(GL_FOG);
        glFogi(GL_FOG_MODE, GL_LINEAR);
        glHint(GL_FOG_HINT, GL_NICEST);
        glFogf(GL_FOG_START, 0);
        glFogf(GL_FOG_END, lp->tunnelLength/1.8);
        glFogfv(GL_FOG_COLOR, fogColor);
        glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
    }
    glShadeModel(GL_SMOOTH);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glClearDepth(1.0f);

    if (!do_texture && !wire) {
        /* If there is no texture, the boxes don't show up without a light.
           Though I don't understand why all the blocks come out gray.
         */
        GLfloat pos[4] = {0.0, 1.0, 1.0, 0.0};
        GLfloat amb[4] = {0.2, 0.2, 0.2, 1.0};
        GLfloat dif[4] = {1.0, 1.0, 1.0, 1.0};
        GLfloat spc[4] = {1.0, 1.0, 1.0, 1.0};
        glLightfv(GL_LIGHT0, GL_POSITION, pos);
        glLightfv(GL_LIGHT0, GL_AMBIENT,  amb);
        glLightfv(GL_LIGHT0, GL_DIFFUSE,  dif);
        glLightfv(GL_LIGHT0, GL_SPECULAR, spc);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
    }

    lp->counter = holdtime;
    lp->currentR = random() % 256;
    lp->currentG = random() % 256;
    lp->currentB = random() % 256;
    newTargetColor(lp);
    for (loop = 0; loop < MAX_ENTITIES; loop++)
    {
        randomize_entity(lp, &lp->entities[loop]);
    }
    reshape_blocktube(mi, MI_WIDTH(mi), MI_HEIGHT(mi));
    glFlush();
}

ENTRYPOINT void 
init_knot (ModeInfo *mi)
{
  knot_configuration *bp;
  int wire = MI_IS_WIREFRAME(mi);

  if (!bps) {
    bps = (knot_configuration *)
      calloc (MI_NUM_SCREENS(mi), sizeof (knot_configuration));
    if (!bps) {
      fprintf(stderr, "%s: out of memory\n", progname);
      exit(1);
    }

    bp = &bps[MI_SCREEN(mi)];
  }

  bp = &bps[MI_SCREEN(mi)];

  bp->glx_context = init_GL(mi);

  if (thickness <= 0) thickness = 0.001;
  else if (thickness > 1) thickness = 1;

  if (segments < 10) segments = 10;

  reshape_knot (mi, MI_WIDTH(mi), MI_HEIGHT(mi));

  if (!wire)
    {
      GLfloat pos[4] = {1.0, 1.0, 1.0, 0.0};
      GLfloat amb[4] = {0.0, 0.0, 0.0, 1.0};
      GLfloat dif[4] = {1.0, 1.0, 1.0, 1.0};
      GLfloat spc[4] = {0.0, 1.0, 1.0, 1.0};

      glEnable(GL_LIGHTING);
      glEnable(GL_LIGHT0);
      glEnable(GL_DEPTH_TEST);
      glEnable(GL_CULL_FACE);

      glLightfv(GL_LIGHT0, GL_POSITION, pos);
      glLightfv(GL_LIGHT0, GL_AMBIENT,  amb);
      glLightfv(GL_LIGHT0, GL_DIFFUSE,  dif);
      glLightfv(GL_LIGHT0, GL_SPECULAR, spc);
    }

  {
    Bool spinx=False, spiny=False, spinz=False;
    double spin_speed   = 2.0;
    double wander_speed = 0.05;
    double spin_accel   = 0.2;

    char *s = do_spin;
    while (*s)
      {
        if      (*s == 'x' || *s == 'X') spinx = True;
        else if (*s == 'y' || *s == 'Y') spiny = True;
        else if (*s == 'z' || *s == 'Z') spinz = True;
        else if (*s == '0') ;
        else
          {
            fprintf (stderr,
         "%s: spin must contain only the characters X, Y, or Z (not \"%s\")\n",
                     progname, do_spin);
            exit (1);
          }
        s++;
      }

    bp->rot = make_rotator (spinx ? spin_speed : 0,
                            spiny ? spin_speed : 0,
                            spinz ? spin_speed : 0,
                            spin_accel,
                            do_wander ? wander_speed : 0,
                            (spinx && spiny && spinz));
    bp->trackball = gltrackball_init ();
  }

  bp->knot_list = glGenLists (1);
  new_knot(mi);

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}

ENTRYPOINT void 
init_ball (ModeInfo *mi)
{
  ball_configuration *bp;
  int wire = MI_IS_WIREFRAME(mi);

  if (!bps) {
    bps = (ball_configuration *)
      calloc (MI_NUM_SCREENS(mi), sizeof (ball_configuration));
    if (!bps) {
      fprintf(stderr, "%s: out of memory\n", progname);
      exit(1);
    }
  }

  bp = &bps[MI_SCREEN(mi)];

  bp->glx_context = init_GL(mi);

  reshape_ball (mi, MI_WIDTH(mi), MI_HEIGHT(mi));

  if (!wire)
    {
      GLfloat pos[4] = {1.0, 1.0, 1.0, 0.0};
      GLfloat amb[4] = {0.0, 0.0, 0.0, 1.0};
      GLfloat dif[4] = {1.0, 1.0, 1.0, 1.0};
      GLfloat spc[4] = {0.0, 1.0, 1.0, 1.0};

      glEnable(GL_LIGHTING);
      glEnable(GL_LIGHT0);
      glEnable(GL_DEPTH_TEST);
      glEnable(GL_CULL_FACE);

      glLightfv(GL_LIGHT0, GL_POSITION, pos);
      glLightfv(GL_LIGHT0, GL_AMBIENT,  amb);
      glLightfv(GL_LIGHT0, GL_DIFFUSE,  dif);
      glLightfv(GL_LIGHT0, GL_SPECULAR, spc);
    }

  {
    double spin_speed   = 10.0;
    double wander_speed = 0.12;
    double spin_accel   = 2.0;

    bp->rot = make_rotator (do_spin ? spin_speed : 0,
                            do_spin ? spin_speed : 0,
                            do_spin ? spin_speed : 0,
                            spin_accel,
                            do_wander ? wander_speed : 0,
                            True);
    bp->trackball = gltrackball_init ();
  }

  bp->ncolors = 128;
  bp->colors = (XColor *) calloc(bp->ncolors, sizeof(XColor));
  make_smooth_colormap (0, 0, 0,
                        bp->colors, &bp->ncolors,
                        False, 0, False);

  bp->spikes = (int *) calloc(MI_COUNT(mi), sizeof(*bp->spikes) * 2);

  bp->ball_list = glGenLists (1);
  bp->spike_list = glGenLists (1);

  glNewList (bp->ball_list, GL_COMPILE);
  unit_sphere (SPHERE_STACKS, SPHERE_SLICES, wire);
  glEndList ();

  glNewList (bp->spike_list, GL_COMPILE);
  cone (0, 0, 0,
        0, 1, 0,
        1, 0, SPIKE_FACES, SMOOTH_SPIKES, False, wire);
  glEndList ();

  randomize_spikes (mi);
}

void
init_molecule (ModeInfo *mi)
{
  molecule_configuration *mc;
  int wire;

#ifndef STANDALONE
  timeout = MI_CYCLES(mi);
#endif
  if (!mcs) {
    mcs = (molecule_configuration *)
      calloc (MI_NUM_SCREENS(mi), sizeof (molecule_configuration));
    if (!mcs) {
       return;
    }
  }

  mc = &mcs[MI_SCREEN(mi)];
  if (mc->glx_context) {
	/* Free font stuff */
	free_fonts (mi);
  }

  if ((mc->glx_context = init_GL(mi)) != NULL) {
    glDrawBuffer(GL_BACK);
    gl_init();
    last = 0;
    reshape_molecule (mi, MI_WIDTH(mi), MI_HEIGHT(mi));
  }

  if (!load_fonts (mi)) {
	release_molecule(mi);
	return;
  }
  if (firstcall)
  startup_blurb (mi);
  cur_wire = MI_IS_WIREFRAME(mi);
  wire = cur_wire;

  mc->rotx = FLOATRAND(1.0) * RANDSIGN();
  mc->roty = FLOATRAND(1.0) * RANDSIGN();
  mc->rotz = FLOATRAND(1.0) * RANDSIGN();

  /* bell curve from 0-6 degrees, avg 3 */
  mc->dx = (FLOATRAND(0.1) + FLOATRAND(0.1) + FLOATRAND(0.1)) / (360/2);
  mc->dy = (FLOATRAND(0.1) + FLOATRAND(0.1) + FLOATRAND(0.1)) / (360/2);
  mc->dz = (FLOATRAND(0.1) + FLOATRAND(0.1) + FLOATRAND(0.1)) / (360/2);

  mc->d_max = mc->dx * 8;

  mc->ddx = 0.00006 + FLOATRAND(0.00003);
  mc->ddy = 0.00006 + FLOATRAND(0.00003);
  mc->ddz = 0.00006 + FLOATRAND(0.00003);

  {
    char *s = do_spin;
    while (*s)
      {
        if      (*s == 'x' || *s == 'X') mc->spin_x = 1;
        else if (*s == 'y' || *s == 'Y') mc->spin_y = 1;
        else if (*s == 'z' || *s == 'Z') mc->spin_z = 1;
        else
          {
            (void) fprintf (stderr,
         "molecule: spin must contain only the characters X, Y, or Z (not \"%s\")\n",
                     do_spin);
            /* exit (1); */
          }
        s++;
      }
  }

  mc->molecule_dlist = glGenLists(1);

  load_molecules (mi);
  mc->which =  NRAND(mc->nmolecules);

#ifdef STANDALONE
  mc->no_label_threshold = get_float_resource ("noLabelThreshold",
                                               "NoLabelThreshold");
  mc->wireframe_threshold = get_float_resource ("wireframeThreshold",
                                                "WireframeThreshold");
#else
  mc->no_label_threshold = 30;
  mc->wireframe_threshold = 150;
#endif

  if (wire)
    do_bonds = 1;
}

//.........这里部分代码省略.........
      glEnable(GL_CULL_FACE);
    }

  if (!wire)
    set_atom_color (mi, 0, False);

  if (do_bonds)
    for (i = 0; i < m->nbonds; i++)
      {
        molecule_bond *b = &m->bonds[i];
        molecule_atom *from = get_atom(m->atoms, m->natoms, b->from,
		MI_IS_VERBOSE(mi));
        molecule_atom *to   = get_atom(m->atoms, m->natoms, b->to,
		MI_IS_VERBOSE(mi));

        if (wire)
          {
            glBegin(GL_LINES);
            glVertex3f(from->x, from->y, from->z);
            glVertex3f(to->x,   to->y,   to->z);
            glEnd();
          }
        else
          {
            int faces = (scale_down ? TUBE_FACES_2 : TUBE_FACES);
# ifdef SMOOTH_TUBE
            int smooth = True;
# else
            int smooth = False;
# endif
            GLfloat thickness = 0.07 * b->strength;
            GLfloat cap_size = 0.03;
            if (thickness > 0.3)
              thickness = 0.3;

            tube (from->x, from->y, from->z,
                  to->x,   to->y,   to->z,
                  thickness, cap_size,
                  faces, smooth, !do_atoms, wire);
          }
      }

  for (i = 0; i < m->natoms; i++)
    {
      molecule_atom *a = &m->atoms[i];
      int i;

      if (!wire && do_atoms)
        {
          GLfloat size = atom_size (a);
          set_atom_color (mi, a, False);
          sphere (a->x, a->y, a->z, size, wire);
        }

      if (do_labels)
        {
          glPushAttrib (GL_LIGHTING_BIT | GL_DEPTH_BUFFER_BIT);
          glDisable (GL_LIGHTING);
          glDisable (GL_DEPTH_TEST);

          if (!wire)
            set_atom_color (mi, a, True);

          glRasterPos3f (a->x, a->y, a->z);

          {
            GLdouble mm[17], pm[17];
            GLint vp[5];
            GLdouble wx=-1, wy=-1, wz=-1;
            glGetDoublev (GL_MODELVIEW_MATRIX, mm);
            glGetDoublev (GL_PROJECTION_MATRIX, pm);
            glGetIntegerv (GL_VIEWPORT, vp);

            /* Convert 3D coordinates to window coordinates */
            gluProject (a->x, a->y, a->z, mm, pm, vp, &wx, &wy, &wz);

            /* Fudge the window coordinates to center the string */
            wx -= string_width (mc->xfont1, a->label) / 2;
            wy -= mc->xfont1->descent;

            /* Convert new window coordinates back to 3D coordinates */
            gluUnProject (wx, wy, wz, mm, pm, vp, &wx, &wy, &wz);
            glRasterPos3f (wx, wy, wz);
          }

          for (i = 0; i < (int) strlen(a->label); i++)
            glCallList (mc->font1_dlist + (int)(a->label[i]));

          glPopAttrib();
        }
    }

  if (do_bbox)
    draw_bounding_box (mi);

  if (do_titles && m->label && *m->label)
    print_title_string (mi, m->label,
                        10, MI_HEIGHT(mi) - 10,
                        mc->xfont2->ascent + mc->xfont2->descent);
}

/* Pick random starting and ending positions for the given sprite.
 */
static void
randomize_sprite (ModeInfo *mi, sprite *sp)
{
  int vp_w = MI_WIDTH(mi);
  int vp_h = MI_HEIGHT(mi);
  int img_w = sp->img->geom.width;
  int img_h = sp->img->geom.height;
  int min_w, max_w;
  double ratio = (double) img_h / img_w;

  if (letterbox_p)
    {
      min_w = img_w;
    }
  else
    {
      if (img_w < vp_w)
        min_w = vp_w;
      else
        min_w = img_w * (float) vp_h / img_h;
    }

  max_w = min_w * 100 / zoom;

  sp->from.w = min_w + frand ((max_w - min_w) * 0.4);
  sp->to.w   = max_w - frand ((max_w - min_w) * 0.4);
  sp->from.h = sp->from.w * ratio;
  sp->to.h   = sp->to.w   * ratio;

  if (zoom == 100)	/* only one box, and it is centered */
    {
      sp->from.x = (sp->from.w > vp_w
                    ? -(sp->from.w - vp_w) / 2
                    :  (vp_w - sp->from.w) / 2);
      sp->from.y = (sp->from.h > vp_h
                    ? -(sp->from.h - vp_h) / 2
                    :  (vp_h - sp->from.h) / 2);
      sp->to = sp->from;
    }
  else			/* position both boxes randomly */
    {
      sp->from.x = (sp->from.w > vp_w
                    ? -frand (sp->from.w - vp_w)
                    :  frand (vp_w - sp->from.w));
      sp->from.y = (sp->from.h > vp_h
                    ? -frand (sp->from.h - vp_h)
                    :  frand (vp_h - sp->from.h));
      sp->to.x   = (sp->to.w > vp_w
                    ? -frand (sp->to.w - vp_w)
                    :  frand (vp_w - sp->to.w));
      sp->to.y   = (sp->to.h > vp_h
                    ? -frand (sp->to.h - vp_h)
                    :  frand (vp_h - sp->to.h));
    }

  if (random() & 1)
    {
      rect swap = sp->to;
      sp->to = sp->from;
      sp->from = swap;
    }

  /* Make sure the aspect ratios are within 0.001 of each other.
   */
  {
    int r1 = 0.5 + (sp->from.w * 1000 / sp->from.h);
    int r2 = 0.5 + (sp->to.w   * 1000 / sp->to.h);
    if (r1 < r2-1 || r1 > r2+1)
      {
        fprintf (stderr,
                 "%s: botched aspect: %f x %f (%d) vs  %f x %f (%d): %s\n",
                 progname, 
                 sp->from.w, sp->from.h, r1,
                 sp->to.w, sp->to.h, r2,
                 (sp->img->title ? sp->img->title : "[null]"));
        abort();
      }
  }

  sp->from.x /= vp_w;
  sp->from.y /= vp_h;
  sp->from.w /= vp_w;
  sp->from.h /= vp_h;
  sp->to.x   /= vp_w;
  sp->to.y   /= vp_h;
  sp->to.w   /= vp_w;
  sp->to.h   /= vp_h;
}

/* Callback that tells us that the texture has been loaded.
 */
static void
image_loaded_cb (const char *filename, XRectangle *geom,
                 int image_width, int image_height,
                 int texture_width, int texture_height,
                 void *closure)
{
  image *img = (image *) closure;
  ModeInfo *mi = img->mi;
  /* slideshow_state *ss = &sss[MI_SCREEN(mi)]; */

  int wire = MI_IS_WIREFRAME(mi);

  if (wire)
    {
      img->w = MI_WIDTH (mi) * (0.5 + frand (1.0));
      img->h = MI_HEIGHT (mi);
      img->geom.width  = img->w;
      img->geom.height = img->h;
      goto DONE;
    }

  if (image_width == 0 || image_height == 0)
    exit (1);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
                   mipmap_p ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

  img->w  = image_width;
  img->h  = image_height;
  img->tw = texture_width;
  img->th = texture_height;
  img->geom = *geom;
  img->title = (filename ? strdup (filename) : 0);

  /* If the image's width doesn't come back as the width of the screen,
     then the image must have been scaled down (due to insufficient
     texture memory.)  Scale up the coordinates to stretch the image
     to fill the window.
   */
  if (img->w != MI_WIDTH(mi))
    {
      double scale = (double) MI_WIDTH(mi) / img->w;
      img->w  *= scale;
      img->h  *= scale;
      img->tw *= scale;
      img->th *= scale;
      img->geom.x      *= scale;
      img->geom.y      *= scale;
      img->geom.width  *= scale;
      img->geom.height *= scale;
    }

  /* xscreensaver-getimage returns paths relative to the image directory
     now, so leave the sub-directory part in.  Unless it's an absolute path.
  */
  if (img->title && img->title[0] == '/')
    {
      /* strip filename to part between last "/" and last ".". */
      char *s = strrchr (img->title, '/');
      if (s) strcpy (img->title, s+1);
      s = strrchr (img->title, '.');
      if (s) *s = 0;
    }

  if (debug_p)
    fprintf (stderr, "%s: loaded   img %2d: \"%s\"\n",
             blurb(), img->id, (img->title ? img->title : "(null)"));
 DONE:

  img->loaded_p = True;
}

ENTRYPOINT void draw_antmaze(ModeInfo * mi) 
{
  double h = (GLfloat) MI_HEIGHT(mi) / (GLfloat) MI_WIDTH(mi);

  antmazestruct *mp;
  
  Display    *display = MI_DISPLAY(mi);
  Window      window = MI_WINDOW(mi);
  
  if(!antmaze)
	return;
  mp = &antmaze[MI_SCREEN(mi)];
  
  MI_IS_DRAWN(mi) = True;
  
  if(!mp->glx_context)
	return;
  
  mi->polygon_count = 0;
  glXMakeCurrent(display, window, *(mp->glx_context));

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  /* first panel */
  glPushMatrix();
/*   h = ((GLfloat) MI_HEIGHT(mi)/2) / (3*(GLfloat)MI_WIDTH(mi)/4); */
  glViewport(MI_WIDTH(mi)/32, MI_HEIGHT(mi)/8, (9*MI_WIDTH(mi))/16, 3*MI_HEIGHT(mi)/4);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();

/*   h = (3*MI_HEIGHT(mi)/4) / (3*MI_WIDTH(mi)/4); */
  gluPerspective(45, 1/h, 1, 25.0);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  device_rotate(mi);

  glPushMatrix();

  /* follow focused ant */
  glTranslatef(0.0, 0.0, -mp->mag - 5.0);
  glRotatef(20.0+5.0*sin(mp->ant_step/40.0), 1.0, 0.0, 0.0);
/*   glTranslatef(0.0,  */
/* 	       started ? -mag : -8.0 + 4.0*fabs(sin(ant_step/10.0)),  */
/* 	       started ? -mag : -8.0 + 4.0*fabs(sin(ant_step/10.0))); */

  gltrackball_rotate(mp->trackball);

  glRotatef(mp->ant_step*0.6, 0.0, 1.0, 0.0);

/*   glRotatef(90.0, 0.0, 0.0, 1.0); */

/*   glTranslatef(-antposition[0][0]-0.5, 0.0, -antposition[focus][1]); */
  /*-elevator*/

  /* sync */
  if(!draw_antmaze_strip(mi)) {
    release_antmaze(mi);
    return;
  }

  glPopMatrix();
  glPopMatrix();

  h = (GLfloat) (3*MI_HEIGHT(mi)/8) / (GLfloat) (MI_WIDTH(mi)/2);

  /* draw overhead */
  glPushMatrix();
  glViewport((17*MI_WIDTH(mi))/32, MI_HEIGHT(mi)/2, MI_WIDTH(mi)/2, 3*MI_HEIGHT(mi)/8);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  device_rotate(mi);
  gluPerspective(45, 1/h, 1, 25.0);
  glMatrixMode(GL_MODELVIEW);
    
  /* twist scene */
  glTranslatef(0.0, 0.0, -16.0);
  glRotatef(60.0, 1.0, 0.0, 0.0);
  glRotatef(-15.0 + mp->ant_step/10.0, 0.0, 1.0, 0.0);
  gltrackball_rotate(mp->trackball);

  /* sync */
  if(!draw_antmaze_strip(mi)) {
    release_antmaze(mi);
    return;
  }

  glPopMatrix();

  /* draw ant display */
  glPushMatrix();
  glViewport((5*MI_WIDTH(mi))/8, MI_HEIGHT(mi)/8, (11*MI_WIDTH(mi))/32, 3*MI_HEIGHT(mi)/8);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  device_rotate(mi);
  gluPerspective(45, 1/h, 1, 25.0);
  glMatrixMode(GL_MODELVIEW);
    
  /* twist scene */
  glTranslatef(0.0, 0.0, -1.6);
//.........这里部分代码省略.........

/* Standard reshape function */
ENTRYPOINT void
reshape_pulsar(ModeInfo *mi, int width, int height)
{
  glViewport( 0, 0, MI_WIDTH(mi), MI_HEIGHT(mi) );
  resetProjection();
}