1 /* -*- Mode: C; tab-width: 4 -*- */
2 /* lissie --- the Lissajous worm */
5 static const char sccsid[] = "@(#)lissie.c 5.00 2000/11/01 xlockmore";
9 * lissie.c - The Lissajous worm for xlock, the X Window System
12 * Copyright (c) 1996 by Alexander Jolk <ub9x@rz.uni-karlsruhe.de>
14 * Permission to use, copy, modify, and distribute this software and its
15 * documentation for any purpose and without fee is hereby granted,
16 * provided that the above copyright notice appear in all copies and that
17 * both that copyright notice and this permission notice appear in
18 * supporting documentation.
20 * This file is provided AS IS with no warranties of any kind. The author
21 * shall have no liability with respect to the infringement of copyrights,
22 * trade secrets or any patents by this file or any part thereof. In no
23 * event will the author be liable for any lost revenue or profits or
24 * other special, indirect and consequential damages.
27 * 01-Nov-2000: Allocation checks
28 * 10-May-1997: Compatible with xscreensaver
29 * 18-Aug-1996: added refresh-hook.
30 * 01-May-1996: written.
35 # define DEFAULTS "*delay: 10000 \n" \
40 # define SMOOTH_COLORS
41 # define reshape_lissie 0
42 # define lissie_handle_event 0
43 # include "xlockmore.h" /* in xscreensaver distribution */
44 #else /* STANDALONE */
45 # include "xlock.h" /* in xlockmore distribution */
46 #endif /* STANDALONE */
50 ENTRYPOINT ModeSpecOpt lissie_opts =
51 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
54 ModStruct lissie_description =
55 {"lissie", "init_lissie", "draw_lissie", "release_lissie",
56 "refresh_lissie", "init_lissie", (char *) NULL, &lissie_opts,
57 10000, 1, 2000, -200, 64, 0.6, "",
58 "Shows lissajous worms", 0, NULL};
65 if (lissie->loc[(n)].x > 0 && lissie->loc[(n)].y > 0 &&\
66 lissie->loc[(n)].x <= lp->width && lissie->loc[(n)].y <= lp->height) {\
68 XDrawPoint(display, MI_WINDOW(mi),\
69 gc, lissie->loc[(n)].x, lissie->loc[(n)].y);\
71 XDrawArc(display, MI_WINDOW(mi), gc,\
72 lissie->loc[(n)].x - lissie->ri / 2,\
73 lissie->loc[(n)].y - lissie->ri / 2,\
74 lissie->ri, lissie->ri, 0, 23040);\
77 #define FLOATRAND(min,max) ((min)+(LRAND()/MAXRAND)*((max)-(min)))
78 #define INTRAND(min,max) ((min)+NRAND((max)-(min)+1))
83 #define MAXLISSIELEN 100
84 #define MINLISSIELEN 10
87 /* How many segments to draw per cycle when redrawing */
91 double tx, ty, dtx, dty;
92 int xi, yi, ri, rx, ry, len, pos;
93 int redrawing, redrawpos;
94 XPoint loc[MAXLISSIELEN];
102 lissiestruct *lissie;
106 static lissstruct *lisses = (lissstruct *) NULL;
110 drawlissie(ModeInfo * mi, lissiestruct * lissie)
112 Display *display = MI_DISPLAY(mi);
114 lissstruct *lp = &lisses[MI_SCREEN(mi)];
115 int p = (++lissie->pos) % MAXLISSIELEN;
116 int oldp = (lissie->pos - lissie->len + MAXLISSIELEN) % MAXLISSIELEN;
118 /* Let time go by ... */
119 lissie->tx += lissie->dtx;
120 lissie->ty += lissie->dty;
121 if (lissie->tx > 2 * M_PI)
122 lissie->tx -= 2 * M_PI;
123 if (lissie->ty > 2 * M_PI)
124 lissie->ty -= 2 * M_PI;
126 /* vary both (x/y) speeds by max. 1% */
127 lissie->dtx *= FLOATRAND(0.99, 1.01);
128 lissie->dty *= FLOATRAND(0.99, 1.01);
129 if (lissie->dtx < MINDT)
131 else if (lissie->dtx > MAXDT)
133 if (lissie->dty < MINDT)
135 else if (lissie->dty > MAXDT)
138 lissie->loc[p].x = lissie->xi + (int) (sin(lissie->tx) * lissie->rx);
139 lissie->loc[p].y = lissie->yi + (int) (sin(lissie->ty) * lissie->ry);
142 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
146 if (MI_NPIXELS(mi) > 2) {
147 XSetForeground(display, gc, MI_PIXEL(mi, lissie->color));
148 if (++lissie->color >= (unsigned) MI_NPIXELS(mi))
151 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
153 if (lissie->redrawing) {
157 /* This compensates for the changed p
158 since the last callback. */
160 for (i = 0; i < REDRAWSTEP; i++) {
161 Lissie((p - lissie->redrawpos + MAXLISSIELEN) % MAXLISSIELEN);
162 if (++(lissie->redrawpos) >= lissie->len) {
163 lissie->redrawing = 0;
171 initlissie(ModeInfo * mi, lissiestruct * lissie)
173 lissstruct *lp = &lisses[MI_SCREEN(mi)];
174 int size = MI_SIZE(mi);
177 if (MI_NPIXELS(mi) > 2)
178 lissie->color = NRAND(MI_NPIXELS(mi));
180 lissie->color = MI_WHITE_PIXEL(mi);
181 /* Initialize parameters */
183 lissie->ri = NRAND(MIN(-size, MAX(MINSIZE,
184 MIN(lp->width, lp->height) / 4)) - MINSIZE + 1) + MINSIZE;
185 else if (size < MINSIZE) {
187 lissie->ri = MAX(MINSIZE, MIN(lp->width, lp->height) / 4);
189 lissie->ri = MINSIZE;
191 lissie->ri = MIN(size, MAX(MINSIZE, MIN(lp->width, lp->height) / 4));
192 lissie->xi = INTRAND(lp->width / 4 + lissie->ri,
193 lp->width * 3 / 4 - lissie->ri);
194 lissie->yi = INTRAND(lp->height / 4 + lissie->ri,
195 lp->height * 3 / 4 - lissie->ri);
196 lissie->rx = INTRAND(lp->width / 4,
197 MIN(lp->width - lissie->xi, lissie->xi)) - 2 * lissie->ri;
198 lissie->ry = INTRAND(lp->height / 4,
199 MIN(lp->height - lissie->yi, lissie->yi)) - 2 * lissie->ri;
200 lissie->len = INTRAND(MINLISSIELEN, MAXLISSIELEN - 1);
203 lissie->redrawing = 0;
205 lissie->tx = FLOATRAND(0, 2 * M_PI);
206 lissie->ty = FLOATRAND(0, 2 * M_PI);
207 lissie->dtx = FLOATRAND(MINDT, MAXDT);
208 lissie->dty = FLOATRAND(MINDT, MAXDT);
210 for (i = 0; i < MAXLISSIELEN; i++)
211 lissie->loc[i].x = lissie->loc[i].y = 0;
213 drawlissie(mi, lissie);
217 init_lissie (ModeInfo * mi)
222 if (lisses == NULL) {
223 if ((lisses = (lissstruct *) calloc(MI_NUM_SCREENS(mi),
224 sizeof (lissstruct))) == NULL)
227 lp = &lisses[MI_SCREEN(mi)];
229 lp->width = MI_WIDTH(mi);
232 jwxyz_XSetAntiAliasing (MI_DISPLAY(mi), MI_GC(mi), False);
235 lp->height = MI_HEIGHT(mi);
237 lp->nlissies = MI_COUNT(mi);
238 if (lp->nlissies < -MINLISSIES) {
240 (void) free((void *) lp->lissie);
241 lp->lissie = (lissiestruct *) NULL;
243 lp->nlissies = NRAND(-lp->nlissies - MINLISSIES + 1) + MINLISSIES;
244 } else if (lp->nlissies < MINLISSIES)
245 lp->nlissies = MINLISSIES;
249 if (lp->lissie == NULL)
250 if ((lp->lissie = (lissiestruct *) calloc(lp->nlissies,
251 sizeof (lissiestruct))) == NULL)
257 for (ball = 0; ball < (unsigned char) lp->nlissies; ball++)
258 initlissie(mi, &lp->lissie[ball]);
263 draw_lissie (ModeInfo * mi)
265 register unsigned char ball;
270 lp = &lisses[MI_SCREEN(mi)];
271 if (lp->lissie == NULL)
274 MI_IS_DRAWN(mi) = True;
276 if (++lp->loopcount > MI_CYCLES(mi)) {
280 for (ball = 0; ball < (unsigned char) lp->nlissies; ball++)
281 drawlissie(mi, &lp->lissie[ball]);
286 release_lissie (ModeInfo * mi)
288 if (lisses != NULL) {
291 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
292 lissstruct *lp = &lisses[screen];
294 if (lp->lissie != NULL) {
295 (void) free((void *) lp->lissie);
296 /* lp->lissie = NULL; */
299 (void) free((void *) lisses);
300 lisses = (lissstruct *) NULL;
305 refresh_lissie(ModeInfo * mi)
312 lp = &lisses[MI_SCREEN(mi)];
313 if (lp->lissie == NULL)
318 for (i = 0; i < lp->nlissies; i++) {
319 lp->lissie[i].redrawing = 1;
320 lp->lissie[i].redrawpos = 0;
325 XSCREENSAVER_MODULE ("Lissie", lissie)
327 #endif /* MODE_lissie */