+++ /dev/null
-/* 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) (abs(random())%x)
-#define PROB(x) (abs(random())<(x*(double)RAND_MAX))
-
-#define NCOLORSMAX 255
-static int width, height, count, cycle;
-static double frac, disorder, handedness;
-static int ncolors=0;
-static GC draw_gc, erase_gc;
-static XColor colors[NCOLORSMAX];
-#define STATES 8
-
-/* 0- 3 left-winding */
-/* 4- 7 right-winding */
-
-#define CLEAR1(x,y) (!fill[((y)%height)*width+(x)%width])
-#define MOVE1(x,y) (fill[((y)%height)*width+(x)%width]=1, XDrawPoint(dpy, window, draw_gc, (x)%width,(y)%height), cov++)
-
-static int cov;
-static int dirh[4];
-static int dirv[4];
-
-static int *fill;
-
-#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, dirh[d],dirv[d])
-#define MOVE(d) (XSetForeground(dpy, draw_gc, colors[w->c].pixel), \
- MOVEDXY(w->h,w->v, dirh[d],dirv[d]), \
- w->h=w->h+dirh[d]*2, \
- w->v=w->v+dirv[d]*2, dir=d)
-
-#define RANDOM (void) (w->h = R(width), w->v = R(height), w->c = R(ncolors), \
- type=R(2), dir=R(4), (cycle && (w->cc=R(3)+ncolors)))
-
-struct worm {
- int h;
- int v;
- int s;
- int c;
- int cc;
-} *worms;
-
-#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(Display *dpy, Window window, struct worm *w)
-{
- int type = w->s / 4;
- int dir = w->s % 4;
-
- w->c = (w->c+w->cc) % ncolors;
-
- if (PROB(disorder)) type=PROB(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 % width;
- w->v = w->v % height;
-}
-
-static void
-init_squiral(Display *dpy, Window window)
-{
- XGCValues gcv;
- Colormap cmap;
- XWindowAttributes xgwa;
- Bool writeable = False;
- int i;
-
- XClearWindow(dpy, window);
- XGetWindowAttributes(dpy, window, &xgwa);
- width = xgwa.width;
- height = xgwa.height;
-
- cmap = xgwa.colormap;
- gcv.foreground = get_pixel_resource("foreground",
- "Foreground", dpy, cmap);
- draw_gc = XCreateGC(dpy, window, GCForeground, &gcv);
- gcv.foreground = get_pixel_resource ("background", "Background",dpy, cmap);
- erase_gc = XCreateGC (dpy, window, GCForeground, &gcv);
- cmap = xgwa.colormap;
- if( ncolors ) {
- free_colors(dpy, cmap, colors, ncolors);
- ncolors = 0;
- }
- if( mono_p ) {
- ncolors=1;
- colors[0].pixel=get_pixel_resource("foreground","Foreground", dpy, cmap);
- } else {
- ncolors = get_integer_resource("ncolors", "Integer");
- if (ncolors < 0 || ncolors > NCOLORSMAX)
- ncolors = NCOLORSMAX;
- make_uniform_colormap(dpy, xgwa.visual, cmap, colors, &ncolors, True,
- &writeable, False);
- if (ncolors <= 0) {
- ncolors = 1;
- colors[0].pixel=get_pixel_resource("foreground","Foreground",dpy, cmap);
- }
- }
- count= get_integer_resource("count", "Integer");
- frac = get_integer_resource("fill", "Integer")*0.01;
- cycle= get_boolean_resource("cycle", "Cycle");
- disorder=get_float_resource("disorder", "Float");
- handedness=get_float_resource("handedness", "Float");
-
- if(frac<0.01) frac=0.01;
- if(frac>0.99) frac=0.99;
- if(count==0) count=width/32;
- if(count<1) count=1;
- if(count>1000) count=1000;
-
- if(worms) free(worms);
- if(fill) free(fill);
-
- worms=calloc(count, sizeof(struct worm));
- fill=calloc(width*height, sizeof(int));
-
- dirh[0]=0; dirh[1]=1; dirh[2]=0; dirh[3]=width-1;
- dirv[0]=height-1; dirv[1]=0; dirv[2]=1; dirv[3]=0;
- for(i=0;i<count;i++) {
- worms[i].h=R(width);
- worms[i].v=R(height);
- worms[i].s=R(4)+4*PROB(handedness);
- worms[i].c=R(ncolors);
- if(cycle) { worms[i].cc=R(3)+ncolors; }
- else worms[i].cc=0;
- }
-}
-
-void
-screenhack(Display *dpy, Window window)
-{
- int inclear, i;
- int delay= get_integer_resource("delay", "Integer");
- init_squiral(dpy, window);
- cov=0; inclear=height;
- while(1) {
- if(inclear<height) {
- XDrawLine(dpy, window, erase_gc, 0, inclear, width-1, inclear);
- memset(&fill[inclear*width], 0, sizeof(int)*width);
- XDrawLine(dpy, window, erase_gc, 0, height-inclear-1, width-1,
- height-inclear-1);
- memset(&fill[(height-inclear-1)*width], 0, sizeof(int)*width);
- inclear++;
- XDrawLine(dpy, window, erase_gc, 0, inclear, width-1, inclear);
- memset(&fill[inclear*width], 0, sizeof(int)*width);
- XDrawLine(dpy, window, erase_gc, 0, height-inclear-1, width-1,
- height-inclear-1);
- memset(&fill[(height-inclear-1)*width], 0, sizeof(int)*width);
- inclear++;
- if(inclear>height/2) inclear=height;
- }
- else if(cov>(frac*width*height)) {
- inclear=0;
- cov=0;
- }
- for(i=0;i<count;i++) do_worm(dpy, window, &worms[i]);
- screenhack_handle_events(dpy);
- usleep(delay);
- }
-}
-
-char *progclass="Squiral";
-
-char *defaults[] = {
- ".background: black",
- ".foreground: white",
- "*fill: 75",
- "*count: 0",
- "*ncolors: 100",
- "*delay: 1000",
- "*disorder: 0.005",
- "*cycle: False",
- "*handedness: .5",
- 0
-};
-
-XrmOptionDescRec 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 }
-};
projects / xscreensaver / blobdiff