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 "*fpsSolid: true \n" \
42 # define SMOOTH_COLORS
43 # define reshape_lissie 0
44 # define lissie_handle_event 0
45 # include "xlockmore.h" /* in xscreensaver distribution */
46 #else /* STANDALONE */
47 # include "xlock.h" /* in xlockmore distribution */
48 #endif /* STANDALONE */
52 ENTRYPOINT ModeSpecOpt lissie_opts =
53 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
56 ModStruct lissie_description =
57 {"lissie", "init_lissie", "draw_lissie", "release_lissie",
58 "refresh_lissie", "init_lissie", (char *) NULL, &lissie_opts,
59 10000, 1, 2000, -200, 64, 0.6, "",
60 "Shows lissajous worms", 0, NULL};
67 if (lissie->loc[(n)].x > 0 && lissie->loc[(n)].y > 0 &&\
68 lissie->loc[(n)].x <= lp->width && lissie->loc[(n)].y <= lp->height) {\
70 XDrawPoint(display, MI_WINDOW(mi),\
71 gc, lissie->loc[(n)].x, lissie->loc[(n)].y);\
73 XDrawArc(display, MI_WINDOW(mi), gc,\
74 lissie->loc[(n)].x - lissie->ri / 2,\
75 lissie->loc[(n)].y - lissie->ri / 2,\
76 lissie->ri, lissie->ri, 0, 23040);\
79 #define FLOATRAND(min,max) ((min)+(LRAND()/MAXRAND)*((max)-(min)))
80 #define INTRAND(min,max) ((min)+NRAND((max)-(min)+1))
85 #define MAXLISSIELEN 100
86 #define MINLISSIELEN 10
89 /* How many segments to draw per cycle when redrawing */
93 double tx, ty, dtx, dty;
94 int xi, yi, ri, rx, ry, len, pos;
95 int redrawing, redrawpos;
96 XPoint loc[MAXLISSIELEN];
104 lissiestruct *lissie;
108 static lissstruct *lisses = (lissstruct *) NULL;
112 drawlissie(ModeInfo * mi, lissiestruct * lissie)
114 Display *display = MI_DISPLAY(mi);
116 lissstruct *lp = &lisses[MI_SCREEN(mi)];
117 int p = (++lissie->pos) % MAXLISSIELEN;
118 int oldp = (lissie->pos - lissie->len + MAXLISSIELEN) % MAXLISSIELEN;
120 /* Let time go by ... */
121 lissie->tx += lissie->dtx;
122 lissie->ty += lissie->dty;
123 if (lissie->tx > 2 * M_PI)
124 lissie->tx -= 2 * M_PI;
125 if (lissie->ty > 2 * M_PI)
126 lissie->ty -= 2 * M_PI;
128 /* vary both (x/y) speeds by max. 1% */
129 lissie->dtx *= FLOATRAND(0.99, 1.01);
130 lissie->dty *= FLOATRAND(0.99, 1.01);
131 if (lissie->dtx < MINDT)
133 else if (lissie->dtx > MAXDT)
135 if (lissie->dty < MINDT)
137 else if (lissie->dty > MAXDT)
140 lissie->loc[p].x = lissie->xi + (int) (sin(lissie->tx) * lissie->rx);
141 lissie->loc[p].y = lissie->yi + (int) (sin(lissie->ty) * lissie->ry);
144 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
148 if (MI_NPIXELS(mi) > 2) {
149 XSetForeground(display, gc, MI_PIXEL(mi, lissie->color));
150 if (++lissie->color >= (unsigned) MI_NPIXELS(mi))
153 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
155 if (lissie->redrawing) {
159 /* This compensates for the changed p
160 since the last callback. */
162 for (i = 0; i < REDRAWSTEP; i++) {
163 Lissie((p - lissie->redrawpos + MAXLISSIELEN) % MAXLISSIELEN);
164 if (++(lissie->redrawpos) >= lissie->len) {
165 lissie->redrawing = 0;
173 initlissie(ModeInfo * mi, lissiestruct * lissie)
175 lissstruct *lp = &lisses[MI_SCREEN(mi)];
176 int size = MI_SIZE(mi);
179 if (MI_NPIXELS(mi) > 2)
180 lissie->color = NRAND(MI_NPIXELS(mi));
182 lissie->color = MI_WHITE_PIXEL(mi);
183 /* Initialize parameters */
185 lissie->ri = NRAND(MIN(-size, MAX(MINSIZE,
186 MIN(lp->width, lp->height) / 4)) - MINSIZE + 1) + MINSIZE;
187 else if (size < MINSIZE) {
189 lissie->ri = MAX(MINSIZE, MIN(lp->width, lp->height) / 4);
191 lissie->ri = MINSIZE;
193 lissie->ri = MIN(size, MAX(MINSIZE, MIN(lp->width, lp->height) / 4));
194 lissie->xi = INTRAND(lp->width / 4 + lissie->ri,
195 lp->width * 3 / 4 - lissie->ri);
196 lissie->yi = INTRAND(lp->height / 4 + lissie->ri,
197 lp->height * 3 / 4 - lissie->ri);
198 lissie->rx = INTRAND(lp->width / 4,
199 MIN(lp->width - lissie->xi, lissie->xi)) - 2 * lissie->ri;
200 lissie->ry = INTRAND(lp->height / 4,
201 MIN(lp->height - lissie->yi, lissie->yi)) - 2 * lissie->ri;
202 lissie->len = INTRAND(MINLISSIELEN, MAXLISSIELEN - 1);
205 lissie->redrawing = 0;
207 lissie->tx = FLOATRAND(0, 2 * M_PI);
208 lissie->ty = FLOATRAND(0, 2 * M_PI);
209 lissie->dtx = FLOATRAND(MINDT, MAXDT);
210 lissie->dty = FLOATRAND(MINDT, MAXDT);
212 for (i = 0; i < MAXLISSIELEN; i++)
213 lissie->loc[i].x = lissie->loc[i].y = 0;
215 drawlissie(mi, lissie);
219 init_lissie (ModeInfo * mi)
224 if (lisses == NULL) {
225 if ((lisses = (lissstruct *) calloc(MI_NUM_SCREENS(mi),
226 sizeof (lissstruct))) == NULL)
229 lp = &lisses[MI_SCREEN(mi)];
231 lp->width = MI_WIDTH(mi);
234 jwxyz_XSetAntiAliasing (MI_DISPLAY(mi), MI_GC(mi), False);
237 lp->height = MI_HEIGHT(mi);
239 lp->nlissies = MI_COUNT(mi);
240 if (lp->nlissies < -MINLISSIES) {
242 (void) free((void *) lp->lissie);
243 lp->lissie = (lissiestruct *) NULL;
245 lp->nlissies = NRAND(-lp->nlissies - MINLISSIES + 1) + MINLISSIES;
246 } else if (lp->nlissies < MINLISSIES)
247 lp->nlissies = MINLISSIES;
251 if (lp->lissie == NULL)
252 if ((lp->lissie = (lissiestruct *) calloc(lp->nlissies,
253 sizeof (lissiestruct))) == NULL)
259 for (ball = 0; ball < (unsigned char) lp->nlissies; ball++)
260 initlissie(mi, &lp->lissie[ball]);
265 draw_lissie (ModeInfo * mi)
267 register unsigned char ball;
272 lp = &lisses[MI_SCREEN(mi)];
273 if (lp->lissie == NULL)
276 MI_IS_DRAWN(mi) = True;
278 if (++lp->loopcount > MI_CYCLES(mi)) {
282 for (ball = 0; ball < (unsigned char) lp->nlissies; ball++)
283 drawlissie(mi, &lp->lissie[ball]);
288 release_lissie (ModeInfo * mi)
290 if (lisses != NULL) {
293 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
294 lissstruct *lp = &lisses[screen];
296 if (lp->lissie != NULL) {
297 (void) free((void *) lp->lissie);
298 /* lp->lissie = NULL; */
301 (void) free((void *) lisses);
302 lisses = (lissstruct *) NULL;
307 refresh_lissie(ModeInfo * mi)
314 lp = &lisses[MI_SCREEN(mi)];
315 if (lp->lissie == NULL)
320 for (i = 0; i < lp->nlissies; i++) {
321 lp->lissie[i].redrawing = 1;
322 lp->lissie[i].redrawpos = 0;
327 XSCREENSAVER_MODULE ("Lissie", lissie)
329 #endif /* MODE_lissie */