/* squiral, by "Jeff Epler" <jepler@inetnebr.com>, 18-mar-1999.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
#include "screenhack.h"
#include "colors.h"
#include "erase.h"
#include "yarandom.h"
#define R(x) (random()%x)
#define PROB(x) (frand(1.0) < (x))
#define NCOLORSMAX 255
#define STATES 8
/* 0- 3 left-winding */
/* 4- 7 right-winding */
struct worm {
int h;
int v;
int s;
int c;
int cc;
};
struct state {
Display *dpy;
Window window;
int width, height, count, cycle;
double frac, disorder, handedness;
int ncolors;
GC draw_gc, erase_gc;
XColor colors[NCOLORSMAX];
int delay;
int cov;
int dirh[4];
int dirv[4];
int *fill;
struct worm *worms;
int inclear;
};
#define CLEAR1(x,y) (!st->fill[((y)%st->height)*st->width+(x)%st->width])
#define MOVE1(x,y) (st->fill[((y)%st->height)*st->width+(x)%st->width]=1, XDrawPoint(st->dpy, st->window, st->draw_gc, (x)%st->width,(y)%st->height), st->cov++)
#define CLEARDXY(x,y,dx,dy) CLEAR1(x+dx, y+dy) && CLEAR1(x+dx+dx, y+dy+dy)
#define MOVEDXY(x,y,dx,dy) MOVE1 (x+dx, y+dy), MOVE1 (x+dx+dx, y+dy+dy)
#define CLEAR(d) CLEARDXY(w->h,w->v, st->dirh[d],st->dirv[d])
#define MOVE(d) (XSetForeground(st->dpy, st->draw_gc, st->colors[w->c].pixel), \
MOVEDXY(w->h,w->v, st->dirh[d],st->dirv[d]), \
w->h=w->h+st->dirh[d]*2, \
w->v=w->v+st->dirv[d]*2, dir=d)
#define RANDOM (void) (w->h = R(st->width), w->v = R(st->height), w->c = R(st->ncolors), \
type=R(2), dir=R(4), (st->cycle && (w->cc=R(3)+st->ncolors)))
#define SUCC(x) ((x+1)%4)
#define PRED(x) ((x+3)%4)
#define CCW PRED(dir)
#define CW SUCC(dir)
#define REV ((dir+2)%4)
#define STR (dir)
#define TRY(x) if (CLEAR(x)) { MOVE(x); break; }
static void
do_worm(struct state *st, struct worm *w)
{
int type = w->s / 4;
int dir = w->s % 4;
w->c = (w->c+w->cc) % st->ncolors;
if (PROB(st->disorder)) type=PROB(st->handedness);
switch(type) {
case 0: /* CCW */
TRY(CCW)
TRY(STR)
TRY(CW)
RANDOM;
break;
case 1: /* CW */
TRY(CW)
TRY(STR)
TRY(CCW)
RANDOM;
break;
}
w->s = type*4+dir;
w->h = w->h % st->width;
w->v = w->v % st->height;
}
static void
squiral_init_1 (struct state *st)
{
int i;
if (st->worms) free (st->worms);
if (st->fill) free (st->fill);
st->worms=calloc(st->count, sizeof(struct worm));
st->fill=calloc(st->width*st->height, sizeof(int));
st->dirh[0]=0; st->dirh[1]=1; st->dirh[2]=0; st->dirh[3]=st->width-1;
st->dirv[0]=st->height-1; st->dirv[1]=0; st->dirv[2]=1; st->dirv[3]=0;
for(i=0;i<st->count;i++) {
st->worms[i].h=R(st->width);
st->worms[i].v=R(st->height);
st->worms[i].s=R(4)+4*PROB(st->handedness);
st->worms[i].c=R(st->ncolors);
if(st->cycle) { st->worms[i].cc=R(3)+st->ncolors; }
else st->worms[i].cc=0;
}
}
static void *
squiral_init (Display *dpy, Window window)
{
struct state *st = (struct state *) calloc (1, sizeof(*st));
XGCValues gcv;
Colormap cmap;
XWindowAttributes xgwa;
Bool writeable = False;
st->dpy = dpy;
st->window = window;
st->delay= get_integer_resource(st->dpy, "delay", "Integer");
XClearWindow(st->dpy, st->window);
XGetWindowAttributes(st->dpy, st->window, &xgwa);
st->width = xgwa.width;
st->height = xgwa.height;
cmap = xgwa.colormap;
gcv.foreground = get_pixel_resource(st->dpy, cmap, "foreground",
"Foreground");
st->draw_gc = XCreateGC(st->dpy, st->window, GCForeground, &gcv);
gcv.foreground = get_pixel_resource (st->dpy, cmap, "background", "Background");
st->erase_gc = XCreateGC (st->dpy, st->window, GCForeground, &gcv);
cmap = xgwa.colormap;
if( st->ncolors ) {
free_colors(xgwa.screen, cmap, st->colors, st->ncolors);
st->ncolors = 0;
}
if( mono_p ) {
st->ncolors=1;
st->colors[0].pixel=get_pixel_resource(st->dpy, cmap, "foreground","Foreground");
} else {
st->ncolors = get_integer_resource(st->dpy, "ncolors", "Integer");
if (st->ncolors < 0 || st->ncolors > NCOLORSMAX)
st->ncolors = NCOLORSMAX;
make_uniform_colormap(xgwa.screen, xgwa.visual, cmap,
st->colors, &st->ncolors, True,
&writeable, False);
if (st->ncolors <= 0) {
st->ncolors = 1;
st->colors[0].pixel=get_pixel_resource(st->dpy, cmap, "foreground","Foreground");
}
}
st->count= get_integer_resource(st->dpy, "count", "Integer");
st->frac = get_integer_resource(st->dpy, "fill", "Integer")*0.01;
st->cycle= get_boolean_resource(st->dpy, "cycle", "Cycle");
st->disorder=get_float_resource(st->dpy, "disorder", "Float");
st->handedness=get_float_resource(st->dpy, "handedness", "Float");
if(st->frac<0.01) st->frac=0.01;
if(st->frac>0.99) st->frac=0.99;
if(st->count==0) st->count=st->width/32;
if(st->count<1) st->count=1;
if(st->count>1000) st->count=1000;
if(st->worms) free(st->worms);
if(st->fill) free(st->fill);
squiral_init_1 (st);
return st;
}
static unsigned long
squiral_draw (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
int i;
if(st->inclear<st->height) {
XDrawLine(st->dpy, st->window, st->erase_gc, 0, st->inclear, st->width-1, st->inclear);
memset(&st->fill[st->inclear*st->width], 0, sizeof(int)*st->width);
XDrawLine(st->dpy, st->window, st->erase_gc, 0, st->height-st->inclear-1, st->width-1,
st->height-st->inclear-1);
memset(&st->fill[(st->height-st->inclear-1)*st->width], 0, sizeof(int)*st->width);
st->inclear++;
XDrawLine(st->dpy, st->window, st->erase_gc, 0, st->inclear, st->width-1, st->inclear);
if (st->inclear < st->height)
memset(&st->fill[st->inclear*st->width], 0, sizeof(int)*st->width);
XDrawLine(st->dpy, st->window, st->erase_gc, 0, st->height-st->inclear-1, st->width-1,
st->height-st->inclear-1);
if (st->height - st->inclear >= 1)
memset(&st->fill[(st->height-st->inclear-1)*st->width], 0, sizeof(int)*st->width);
st->inclear++;
if(st->inclear>st->height/2) st->inclear=st->height;
}
else if(st->cov>(st->frac*st->width*st->height)) {
st->inclear=0;
st->cov=0;
}
for(i=0;i<st->count;i++) do_worm(st, &st->worms[i]);
return st->delay;
}
static void
squiral_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
struct state *st = (struct state *) closure;
st->width = w;
st->height = h;
squiral_init_1 (st);
XClearWindow (dpy, window);
}
static Bool
squiral_event (Display *dpy, Window window, void *closure, XEvent *event)
{
struct state *st = (struct state *) closure;
if (screenhack_event_helper (dpy, window, event))
{
squiral_init_1 (st);
XClearWindow (dpy, window);
return True;
}
return False;
}
static void
squiral_free (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
if (st->worms) free (st->worms);
if (st->fill) free (st->fill);
/* if (st->ncolors)
free_colors (st->xgwa.screen, st->xgwa.cmap, st->colors, st->ncolors); */
XFreeGC (dpy, st->draw_gc);
XFreeGC (dpy, st->erase_gc);
free (st);
}
static const char *squiral_defaults[] = {
".lowrez: true",
".background: black",
".foreground: white",
"*fpsSolid: true",
"*fill: 75",
"*count: 0",
"*ncolors: 100",
"*delay: 10000",
"*disorder: 0.005",
"*cycle: False",
"*handedness: 0.5",
#ifdef HAVE_MOBILE
"*ignoreRotation: True",
#endif
0
};
static XrmOptionDescRec squiral_options[] = {
{"-fill", ".fill", XrmoptionSepArg, 0},
{"-count", ".count", XrmoptionSepArg, 0},
{"-delay", ".delay", XrmoptionSepArg, 0},
{"-disorder", ".disorder", XrmoptionSepArg, 0},
{"-handedness", ".handedness", XrmoptionSepArg, 0},
{"-ncolors", ".ncolors", XrmoptionSepArg, 0},
{"-cycle", ".cycle", XrmoptionNoArg, "True"},
{"-no-cycle", ".cycle", XrmoptionNoArg, "False"},
{ 0, 0, 0, 0 }
};
XSCREENSAVER_MODULE ("Squiral", squiral)
