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