324 lines
8.0 KiB
C
324 lines
8.0 KiB
C
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/* -*- Mode: C; tab-width: 4 -*- */
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/* lissie --- the Lissajous worm */
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#if !defined( lint ) && !defined( SABER )
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static const char sccsid[] = "@(#)lissie.c 5.00 2000/11/01 xlockmore";
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#endif
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/*-
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* lissie.c - The Lissajous worm for xlock, the X Window System
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* lockscreen.
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*
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* Copyright (c) 1996 by Alexander Jolk <ub9x@rz.uni-karlsruhe.de>
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation.
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*
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* This file is provided AS IS with no warranties of any kind. The author
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* shall have no liability with respect to the infringement of copyrights,
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* trade secrets or any patents by this file or any part thereof. In no
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* event will the author be liable for any lost revenue or profits or
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* other special, indirect and consequential damages.
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*
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* Revision History:
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* 01-Nov-2000: Allocation checks
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* 10-May-1997: Compatible with xscreensaver
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* 18-Aug-1996: added refresh-hook.
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* 01-May-1996: written.
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*/
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#ifdef STANDALONE
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#define MODE_lissie
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#define PROGCLASS "Lissie"
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#define HACK_INIT init_lissie
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#define HACK_DRAW draw_lissie
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#define lissie_opts xlockmore_opts
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#define DEFAULTS "*delay: 10000 \n" \
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"*count: 1 \n" \
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"*cycles: 20000 \n" \
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"*size: -200 \n" \
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"*ncolors: 200 \n"
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#define SMOOTH_COLORS
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#include "xlockmore.h" /* in xscreensaver distribution */
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#else /* STANDALONE */
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#include "xlock.h" /* in xlockmore distribution */
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#endif /* STANDALONE */
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#ifdef MODE_lissie
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ModeSpecOpt lissie_opts =
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{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
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#ifdef USE_MODULES
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ModStruct lissie_description =
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{"lissie", "init_lissie", "draw_lissie", "release_lissie",
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"refresh_lissie", "init_lissie", (char *) NULL, &lissie_opts,
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10000, 1, 2000, -200, 64, 0.6, "",
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"Shows lissajous worms", 0, NULL};
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#endif
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#define MINSIZE 1
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#define Lissie(n)\
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if (lissie->loc[(n)].x > 0 && lissie->loc[(n)].y > 0 &&\
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lissie->loc[(n)].x <= lp->width && lissie->loc[(n)].y <= lp->height) {\
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if (lissie->ri < 2)\
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XDrawPoint(display, MI_WINDOW(mi),\
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gc, lissie->loc[(n)].x, lissie->loc[(n)].y);\
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else\
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XDrawArc(display, MI_WINDOW(mi), gc,\
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lissie->loc[(n)].x - lissie->ri / 2,\
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lissie->loc[(n)].y - lissie->ri / 2,\
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lissie->ri, lissie->ri, 0, 23040);\
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}
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#define FLOATRAND(min,max) ((min)+(LRAND()/MAXRAND)*((max)-(min)))
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#define INTRAND(min,max) ((min)+NRAND((max)-(min)+1))
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#define MINDT 0.01
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#define MAXDT 0.15
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#define MAXLISSIELEN 100
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#define MINLISSIELEN 10
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#define MINLISSIES 1
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/* How many segments to draw per cycle when redrawing */
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#define REDRAWSTEP 3
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typedef struct {
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double tx, ty, dtx, dty;
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int xi, yi, ri, rx, ry, len, pos;
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int redrawing, redrawpos;
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XPoint loc[MAXLISSIELEN];
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unsigned long color;
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} lissiestruct;
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typedef struct {
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Bool painted;
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int width, height;
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int nlissies;
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lissiestruct *lissie;
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int loopcount;
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} lissstruct;
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static lissstruct *lisses = (lissstruct *) NULL;
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static void
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drawlissie(ModeInfo * mi, lissiestruct * lissie)
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{
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Display *display = MI_DISPLAY(mi);
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GC gc = MI_GC(mi);
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lissstruct *lp = &lisses[MI_SCREEN(mi)];
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int p = (++lissie->pos) % MAXLISSIELEN;
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int oldp = (lissie->pos - lissie->len + MAXLISSIELEN) % MAXLISSIELEN;
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/* Let time go by ... */
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lissie->tx += lissie->dtx;
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lissie->ty += lissie->dty;
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if (lissie->tx > 2 * M_PI)
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lissie->tx -= 2 * M_PI;
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if (lissie->ty > 2 * M_PI)
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lissie->ty -= 2 * M_PI;
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/* vary both (x/y) speeds by max. 1% */
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lissie->dtx *= FLOATRAND(0.99, 1.01);
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lissie->dty *= FLOATRAND(0.99, 1.01);
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if (lissie->dtx < MINDT)
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lissie->dtx = MINDT;
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else if (lissie->dtx > MAXDT)
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lissie->dtx = MAXDT;
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if (lissie->dty < MINDT)
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lissie->dty = MINDT;
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else if (lissie->dty > MAXDT)
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lissie->dty = MAXDT;
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lissie->loc[p].x = lissie->xi + (int) (sin(lissie->tx) * lissie->rx);
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lissie->loc[p].y = lissie->yi + (int) (sin(lissie->ty) * lissie->ry);
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/* Mask */
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XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
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Lissie(oldp);
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/* Redraw */
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if (MI_NPIXELS(mi) > 2) {
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XSetForeground(display, gc, MI_PIXEL(mi, lissie->color));
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if (++lissie->color >= (unsigned) MI_NPIXELS(mi))
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lissie->color = 0;
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} else
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XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
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Lissie(p);
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if (lissie->redrawing) {
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int i;
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lissie->redrawpos++;
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/* This compensates for the changed p
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since the last callback. */
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for (i = 0; i < REDRAWSTEP; i++) {
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Lissie((p - lissie->redrawpos + MAXLISSIELEN) % MAXLISSIELEN);
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if (++(lissie->redrawpos) >= lissie->len) {
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lissie->redrawing = 0;
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break;
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}
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}
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}
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}
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static void
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initlissie(ModeInfo * mi, lissiestruct * lissie)
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{
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lissstruct *lp = &lisses[MI_SCREEN(mi)];
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int size = MI_SIZE(mi);
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int i;
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if (MI_NPIXELS(mi) > 2)
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lissie->color = NRAND(MI_NPIXELS(mi));
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else
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lissie->color = MI_WHITE_PIXEL(mi);
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/* Initialize parameters */
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if (size < -MINSIZE)
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lissie->ri = NRAND(MIN(-size, MAX(MINSIZE,
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MIN(lp->width, lp->height) / 4)) - MINSIZE + 1) + MINSIZE;
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else if (size < MINSIZE) {
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if (!size)
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lissie->ri = MAX(MINSIZE, MIN(lp->width, lp->height) / 4);
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else
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lissie->ri = MINSIZE;
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} else
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lissie->ri = MIN(size, MAX(MINSIZE, MIN(lp->width, lp->height) / 4));
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lissie->xi = INTRAND(lp->width / 4 + lissie->ri,
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lp->width * 3 / 4 - lissie->ri);
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lissie->yi = INTRAND(lp->height / 4 + lissie->ri,
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lp->height * 3 / 4 - lissie->ri);
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lissie->rx = INTRAND(lp->width / 4,
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MIN(lp->width - lissie->xi, lissie->xi)) - 2 * lissie->ri;
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lissie->ry = INTRAND(lp->height / 4,
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MIN(lp->height - lissie->yi, lissie->yi)) - 2 * lissie->ri;
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lissie->len = INTRAND(MINLISSIELEN, MAXLISSIELEN - 1);
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lissie->pos = 0;
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lissie->redrawing = 0;
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lissie->tx = FLOATRAND(0, 2 * M_PI);
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lissie->ty = FLOATRAND(0, 2 * M_PI);
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lissie->dtx = FLOATRAND(MINDT, MAXDT);
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lissie->dty = FLOATRAND(MINDT, MAXDT);
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for (i = 0; i < MAXLISSIELEN; i++)
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lissie->loc[i].x = lissie->loc[i].y = 0;
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/* Draw lissie */
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drawlissie(mi, lissie);
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}
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void
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init_lissie(ModeInfo * mi)
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{
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lissstruct *lp;
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unsigned char ball;
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if (lisses == NULL) {
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if ((lisses = (lissstruct *) calloc(MI_NUM_SCREENS(mi),
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sizeof (lissstruct))) == NULL)
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return;
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}
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lp = &lisses[MI_SCREEN(mi)];
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lp->width = MI_WIDTH(mi);
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lp->height = MI_HEIGHT(mi);
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lp->nlissies = MI_COUNT(mi);
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if (lp->nlissies < -MINLISSIES) {
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if (lp->lissie) {
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free(lp->lissie);
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lp->lissie = (lissiestruct *) NULL;
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}
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lp->nlissies = NRAND(-lp->nlissies - MINLISSIES + 1) + MINLISSIES;
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} else if (lp->nlissies < MINLISSIES)
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lp->nlissies = MINLISSIES;
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lp->loopcount = 0;
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if (lp->lissie == NULL)
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if ((lp->lissie = (lissiestruct *) calloc(lp->nlissies,
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sizeof (lissiestruct))) == NULL)
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return;
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MI_CLEARWINDOW(mi);
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lp->painted = False;
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for (ball = 0; ball < (unsigned char) lp->nlissies; ball++)
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initlissie(mi, &lp->lissie[ball]);
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}
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void
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draw_lissie(ModeInfo * mi)
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{
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register unsigned char ball;
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lissstruct *lp;
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if (lisses == NULL)
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return;
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lp = &lisses[MI_SCREEN(mi)];
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if (lp->lissie == NULL)
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return;
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MI_IS_DRAWN(mi) = True;
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if (++lp->loopcount > MI_CYCLES(mi)) {
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init_lissie(mi);
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} else {
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lp->painted = True;
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for (ball = 0; ball < (unsigned char) lp->nlissies; ball++)
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drawlissie(mi, &lp->lissie[ball]);
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}
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}
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void
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release_lissie(ModeInfo * mi)
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{
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if (lisses != NULL) {
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int screen;
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for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
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lissstruct *lp = &lisses[screen];
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if (lp->lissie != NULL) {
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free(lp->lissie);
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/* lp->lissie = NULL; */
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}
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}
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free(lisses);
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lisses = (lissstruct *) NULL;
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}
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}
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void
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refresh_lissie(ModeInfo * mi)
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{
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int i;
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lissstruct *lp;
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if (lisses == NULL)
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return;
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lp = &lisses[MI_SCREEN(mi)];
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if (lp->lissie == NULL)
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return;
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if (lp->painted) {
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MI_CLEARWINDOW(mi);
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for (i = 0; i < lp->nlissies; i++) {
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lp->lissie[i].redrawing = 1;
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lp->lissie[i].redrawpos = 0;
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}
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}
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}
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#endif /* MODE_lissie */
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