2 /* -*- Mode: C; tab-width: 4 -*- */
3 /* worm --- draw wiggly worms */
6 static const char sccsid[] = "@(#)worm.c 4.04 97/07/28 xlockmore";
10 * Copyright (c) 1991 by Patrick J. Naughton.
12 * Permission to use, copy, modify, and distribute this software and its
13 * documentation for any purpose and without fee is hereby granted,
14 * provided that the above copyright notice appear in all copies and that
15 * both that copyright notice and this permission notice appear in
16 * supporting documentation.
18 * This file is provided AS IS with no warranties of any kind. The author
19 * shall have no liability with respect to the infringement of copyrights,
20 * trade secrets or any patents by this file or any part thereof. In no
21 * event will the author be liable for any lost revenue or profits or
22 * other special, indirect and consequential damages.
25 * 10-May-97: Compatible with xscreensaver
26 * 03-Sep-96: fixed bug in allocation of space for worms, added 3d support
27 * Henrik Theiling <theiling@coli.uni-sb.de>
28 * 27-Sep-95: put back malloc
29 * 23-Sep-93: got rid of "rint". (David Bagley)
30 * 27-Sep-91: got rid of all malloc calls since there were no calls to free().
31 * 25-Sep-91: Integrated into X11R5 contrib xlock.
33 * Adapted from a concept in the Dec 87 issue of Scientific American p. 142.
35 * SunView version: Brad Taylor <brad@sun.com>
36 * X11 version: Dave Lemke <lemke@ncd.com>
37 * xlock version: Boris Putanec <bp@cs.brown.edu>
41 # define DEFAULTS "*delay: 17000 \n" \
50 "*both3d: magenta \n" \
52 # define SMOOTH_COLORS
53 # define reshape_worm 0
54 # define worm_handle_event 0
55 # include "xlockmore.h" /* in xscreensaver distribution */
56 #else /* STANDALONE */
57 # include "xlock.h" /* in xlockmore distribution */
58 #endif /* STANDALONE */
60 ENTRYPOINT ModeSpecOpt worm_opts =
61 {0, NULL, 0, NULL, NULL};
71 #define GETZDIFF(z) (MI_DELTA3D(mi)*20.0*(1.0-(SCREENZ)/((float)(z)+MINZ)))
72 #define IRINT(x) ((int)(((x)>0.0)?(x)+0.5:(x)-0.5))
74 /* How many segments to draw per cycle when redrawing */
83 int redrawing, redrawpos;
87 int xsize, ysize, zsize;
93 XRectangle *rects; /* [NUMCOLORS * batchcount/NUMCOLORS+1] */
99 static float sintab[SEGMENTS];
100 static float costab[SEGMENTS];
101 static int init_table = 0;
103 static wormstruct *worms = NULL;
106 worm_doit(ModeInfo * mi, int which, unsigned long color)
108 Display *display = MI_DISPLAY(mi);
109 Window window = MI_WINDOW(mi);
111 wormstruct *wp = &worms[MI_SCREEN(mi)];
112 wormstuff *ws = &wp->worm[which];
117 if (ws->tail == wp->wormlength)
120 x = ws->circ[ws->tail].x;
121 y = ws->circ[ws->tail].y;
123 if (MI_WIN_IS_USE3D(mi)) {
124 diff = ws->diffcirc[ws->tail];
125 if (MI_WIN_IS_INSTALL(mi)) {
126 XSetForeground(display, gc, MI_NONE_COLOR(mi));
127 XFillRectangle(display, window, gc, x - diff, y,
128 wp->circsize, wp->circsize);
129 XFillRectangle(display, window, gc, x + diff, y,
130 wp->circsize, wp->circsize);
132 XClearArea(display, window, x - diff, y,
133 wp->circsize, wp->circsize, False);
134 XClearArea(display, window, x + diff, y,
135 wp->circsize, wp->circsize, False);
138 XClearArea(display, window, x, y, wp->circsize, wp->circsize, False);
141 ws->dir = (ws->dir + 1) % SEGMENTS;
143 ws->dir = (ws->dir + SEGMENTS - 1) % SEGMENTS;
145 x = (ws->x + IRINT((float) wp->circsize * costab[ws->dir]) +
146 wp->xsize) % wp->xsize;
147 y = (ws->y + IRINT((float) wp->circsize * sintab[ws->dir]) +
148 wp->ysize) % wp->ysize;
150 ws->circ[ws->tail].x = x;
151 ws->circ[ws->tail].y = y;
155 if (MI_WIN_IS_USE3D(mi)) {
157 ws->dir2 = (ws->dir2 + 1) % SEGMENTS;
159 ws->dir2 = (ws->dir2 + SEGMENTS - 1) % SEGMENTS;
160 /* for the z-axis the wrap-around looks bad, so worms should just turn around. */
161 z = (int) (ws->z + wp->circsize * sintab[ws->dir2]);
162 if (z < 0 || z >= wp->zsize)
163 z = (int) (ws->z - wp->circsize * sintab[ws->dir2]);
165 diff = (int) (GETZDIFF(z) + 0.5); /* ROUND */
166 ws->diffcirc[ws->tail] = diff;
172 wp->rects[color * wp->maxsize + wp->size[color]].x = x + diff;
173 wp->rects[color * wp->maxsize + wp->size[color]].y = y;
178 wp->rects[color * wp->maxsize + wp->size[color]].x = x - diff;
179 wp->rects[color * wp->maxsize + wp->size[color]].y = y;
183 if (ws->redrawing) { /* Too hard for now */
186 for (j = 0; j < REDRAWSTEP; j++) {
187 int k = (ws->tail - ws->redrawpos + wp->wormlength)
191 wp->rects[color * wp->maxsize + wp->size[color]].x =
192 ws->circ[k].x + ws->diffcirc[k];
193 wp->rects[color * wp->maxsize + wp->size[color]].y =
198 wp->rects[color * wp->maxsize + wp->size[color]].x =
199 ws->circ[k].x - ws->diffcirc[k];
200 wp->rects[color * wp->maxsize + wp->size[color]].y =
204 if (++(ws->redrawpos) >= wp->wormlength) {
214 wp->rects[color * wp->maxsize + wp->size[color]].x = x;
215 wp->rects[color * wp->maxsize + wp->size[color]].y = y;
221 /* Compensates for the changed ws->tail
222 since the last callback. */
224 for (j = 0; j < REDRAWSTEP; j++) {
225 int k = (ws->tail - ws->redrawpos + wp->wormlength)
228 wp->rects[color * wp->maxsize + wp->size[color]].x = ws->circ[k].x;
229 wp->rects[color * wp->maxsize + wp->size[color]].y = ws->circ[k].y;
232 if (++(ws->redrawpos) >= wp->wormlength) {
242 free_worms(wormstruct * wp)
247 for (wn = 0; wn < wp->nw; wn++) {
248 if (wp->worm[wn].circ)
249 (void) free((void *) wp->worm[wn].circ);
250 if (wp->worm[wn].diffcirc)
251 (void) free((void *) wp->worm[wn].diffcirc);
253 (void) free((void *) wp->worm);
257 (void) free((void *) wp->rects);
261 (void) free((void *) wp->size);
267 init_worm (ModeInfo * mi)
270 int size = MI_SIZE(mi);
274 if ((worms = (wormstruct *) calloc(MI_NUM_SCREENS(mi),
275 sizeof (wormstruct))) == NULL)
278 wp = &worms[MI_SCREEN(mi)];
279 if (MI_NPIXELS(mi) <= 2 || MI_WIN_IS_USE3D(mi))
282 wp->nc = MI_NPIXELS(mi);
283 if (wp->nc > NUMCOLORS)
287 wp->nw = MI_BATCHCOUNT(mi);
288 if (wp->nw < -MINWORMS)
289 wp->nw = NRAND(-wp->nw - MINWORMS + 1) + MINWORMS;
290 else if (wp->nw < MINWORMS)
293 wp->worm = (wormstuff *) malloc(wp->nw * sizeof (wormstuff));
296 wp->size = (int *) malloc(NUMCOLORS * sizeof (int));
298 wp->maxsize = (REDRAWSTEP + 1) * wp->nw; /* / wp->nc + 1; */
301 (XRectangle *) malloc(wp->maxsize * NUMCOLORS * sizeof (XRectangle));
306 for (i = 0; i < SEGMENTS; i++) {
307 sintab[i] = SINF(i * 2.0 * M_PI / SEGMENTS);
308 costab[i] = COSF(i * 2.0 * M_PI / SEGMENTS);
311 wp->xsize = MI_WIN_WIDTH(mi);
312 wp->ysize = MI_WIN_HEIGHT(mi);
313 wp->zsize = MAXZ - MINZ + 1;
314 if (MI_NPIXELS(mi) > 2)
315 wp->chromo = NRAND(MI_NPIXELS(mi));
318 wp->circsize = NRAND(-size - MINSIZE + 1) + MINSIZE;
319 else if (size < MINSIZE)
320 wp->circsize = MINSIZE;
324 for (i = 0; i < wp->nc; i++) {
325 for (j = 0; j < wp->maxsize; j++) {
326 wp->rects[i * wp->maxsize + j].width = wp->circsize;
327 wp->rects[i * wp->maxsize + j].height = wp->circsize;
331 (void) memset((char *) wp->size, 0, wp->nc * sizeof (int));
333 wp->wormlength = (int) sqrt(wp->xsize + wp->ysize) *
334 MI_CYCLES(mi) / 8; /* Fudge this to something reasonable */
335 for (i = 0; i < wp->nw; i++) {
336 wp->worm[i].circ = (XPoint *) malloc(wp->wormlength * sizeof (XPoint));
337 wp->worm[i].diffcirc = (int *) malloc(wp->wormlength * sizeof (int));
339 for (j = 0; j < wp->wormlength; j++) {
340 wp->worm[i].circ[j].x = wp->xsize / 2;
341 wp->worm[i].circ[j].y = wp->ysize / 2;
342 if (MI_WIN_IS_USE3D(mi))
343 wp->worm[i].diffcirc[j] = 0;
345 wp->worm[i].dir = NRAND(SEGMENTS);
346 wp->worm[i].dir2 = NRAND(SEGMENTS);
347 wp->worm[i].tail = 0;
348 wp->worm[i].x = wp->xsize / 2;
349 wp->worm[i].y = wp->ysize / 2;
350 wp->worm[i].z = SCREENZ - MINZ;
351 wp->worm[i].redrawing = 0;
354 if (MI_WIN_IS_INSTALL(mi) && MI_WIN_IS_USE3D(mi)) {
355 XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_NONE_COLOR(mi));
356 XFillRectangle(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
357 0, 0, wp->xsize, wp->ysize);
359 XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
363 draw_worm (ModeInfo * mi)
365 Display *display = MI_DISPLAY(mi);
366 Window window = MI_WINDOW(mi);
368 wormstruct *wp = &worms[MI_SCREEN(mi)];
369 unsigned long wcolor;
372 (void) memset((char *) wp->size, 0, wp->nc * sizeof (int));
374 for (i = 0; i < wp->nw; i++) {
375 if (MI_NPIXELS(mi) > 2) {
376 wcolor = (i + wp->chromo) % wp->nc;
378 worm_doit(mi, i, wcolor);
380 worm_doit(mi, i, (unsigned long) 0);
383 if (MI_WIN_IS_USE3D(mi)) {
384 if (MI_WIN_IS_INSTALL(mi))
385 XSetFunction(display, gc, GXor);
386 XSetForeground(display, gc, MI_RIGHT_COLOR(mi));
387 XFillRectangles(display, window, gc, &(wp->rects[0]), wp->size[0]);
389 XSetForeground(display, gc, MI_LEFT_COLOR(mi));
390 XFillRectangles(display, window, gc, &(wp->rects[wp->maxsize]), wp->size[1]);
391 if (MI_WIN_IS_INSTALL(mi))
392 XSetFunction(display, gc, GXcopy);
393 } else if (MI_NPIXELS(mi) > 2) {
394 for (i = 0; i < wp->nc; i++) {
395 XSetForeground(display, gc, MI_PIXEL(mi, i));
396 XFillRectangles(display, window, gc, &(wp->rects[i * wp->maxsize]), wp->size[i]);
399 XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
400 XFillRectangles(display, window, gc,
401 &(wp->rects[0]), wp->size[0]);
404 if (++wp->chromo == (unsigned long) wp->nc)
409 release_worm(ModeInfo * mi)
414 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
415 free_worms(&worms[screen]);
416 (void) free((void *) worms);
422 refresh_worm (ModeInfo * mi)
424 if (MI_WIN_IS_USE3D(mi))
425 /* The 3D code does drawing&clearing by XORing. We do not
426 want to go to too much trouble here to make it redraw
428 XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
429 else if (worms != NULL) {
430 wormstruct *wp = &worms[MI_SCREEN(mi)];
433 for (i = 0; i < wp->nw; i++) {
434 wp->worm[i].redrawing = 1;
435 wp->worm[i].redrawpos = 0;
440 XSCREENSAVER_MODULE ("Worm", worm)