/* xscreensaver, Copyright (c) 1992, 1995, 1996, 1997, 1998 * Jamie Zawinski * * 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. */ /* 18-Sep-97: Johannes Keukelaar : Added some color. * Using -mono gives the old behaviour. (Modified by jwz.) */ /* Flying through an asteroid field. Based on TI Explorer Lisp code by John Nguyen */ #include #include #include "screenhack.h" #define MIN_ROCKS 1 #define MIN_DEPTH 2 /* rocks disappear when they get this close */ #define MAX_DEPTH 60 /* this is where rocks appear */ #define MIN_SIZE 3 /* how small where pixmaps are not used */ #define MAX_SIZE 200 /* how big (in pixels) rocks are at depth 1 */ #define DEPTH_SCALE 100 /* how many ticks there are between depths */ #define SIN_RESOLUTION 1000 #define MAX_DEP 0.3 /* how far the displacement can be (percent) */ #define DIRECTION_CHANGE_RATE 60 #define MAX_DEP_SPEED 5 /* Maximum speed for movement */ #define MOVE_STYLE 0 /* Only 0 and 1. Distinguishes the fact that these are the rocks that are moving (1) or the rocks source (0). */ /* there's not much point in the above being user-customizable, but those numbers might want to be tweaked for displays with an order of magnitude higher resolution or compute power. */ static double sins [SIN_RESOLUTION]; static double coss [SIN_RESOLUTION]; static double depths [(MAX_DEPTH + 1) * DEPTH_SCALE]; static Display *dpy; static Window window; static int width, height, midx, midy; static int dep_x, dep_y; static int ncolors; static XColor *colors; static float max_dep; static GC erase_gc; static GC *draw_gcs; static Bool rotate_p; static Bool move_p; static int speed; static Bool threed; static GC threed_left_gc, threed_right_gc; static double threed_delta; #define GETZDIFF(z) \ (threed_delta * 40.0 * \ (1.0 - ((MAX_DEPTH * DEPTH_SCALE / 2) / \ ((z) + 20.0 * DEPTH_SCALE)))) struct rock { int real_size; int r; int theta; int depth; int size, x, y; int diff; int color; }; static struct rock *rocks; static int nrocks; static Pixmap pixmaps [MAX_SIZE]; static int delay; static void rock_compute (struct rock *); static void rock_draw (struct rock *, Bool draw_p); static void rock_reset (struct rock *rock) { rock->real_size = MAX_SIZE; rock->r = (SIN_RESOLUTION * 0.7) + (random () % (30 * SIN_RESOLUTION)); rock->theta = random () % SIN_RESOLUTION; rock->depth = MAX_DEPTH * DEPTH_SCALE; rock->color = random() % ncolors; rock_compute (rock); rock_draw (rock, True); } static void rock_tick (struct rock *rock, int d) { if (rock->depth > 0) { rock_draw (rock, False); rock->depth -= speed; if (rotate_p) { rock->theta = (rock->theta + d) % SIN_RESOLUTION; } while (rock->theta < 0) rock->theta += SIN_RESOLUTION; if (rock->depth < (MIN_DEPTH * DEPTH_SCALE)) rock->depth = 0; else { rock_compute (rock); rock_draw (rock, True); } } else if ((random () % 40) == 0) rock_reset (rock); } static void rock_compute (struct rock *rock) { double factor = depths [rock->depth]; double rsize = rock->real_size * factor; rock->size = (int) (rsize + 0.5); rock->diff = (int) GETZDIFF(rock->depth); rock->x = midx + (coss [rock->theta] * rock->r * factor); rock->y = midy + (sins [rock->theta] * rock->r * factor); if (move_p) { double move_factor = (((double) MOVE_STYLE) - (((double) rock->depth) / (((double) (MAX_DEPTH + 1)) * ((double) DEPTH_SCALE)))); /* move_factor is 0 when the rock is close, 1 when far */ rock->x += (((double) dep_x) * move_factor); rock->y += (((double) dep_y) * move_factor); } } static void rock_draw (rock, draw_p) struct rock *rock; Bool draw_p; { GC gc = (draw_p ? (threed ? erase_gc : draw_gcs[rock->color]) : erase_gc); if (rock->x <= 0 || rock->y <= 0 || rock->x >= width || rock->y >= height) { /* this means that if a rock were to go off the screen at 12:00, but would have been visible at 3:00, it won't come back once the observer rotates around so that the rock would have been visible again. Oh well. */ if (!move_p) rock->depth = 0; return; } if (rock->size <= 1) { if (threed) { if (draw_p) gc = threed_left_gc; XDrawPoint (dpy, window, gc, rock->x - rock->diff, rock->y); if (draw_p) gc = threed_right_gc; XDrawPoint (dpy, window, gc, rock->x + rock->diff, rock->y); } else { XDrawPoint (dpy, window, gc, rock->x, rock->y); } } else if (rock->size <= MIN_SIZE || !draw_p) { if (threed) { if (draw_p) gc = threed_left_gc; XFillRectangle(dpy, window, gc, rock->x - rock->size / 2 - rock->diff, rock->y - rock->size / 2, rock->size, rock->size); if (draw_p) gc = threed_right_gc; XFillRectangle(dpy, window, gc, rock->x - rock->size / 2 + rock->diff, rock->y - rock->size / 2, rock->size, rock->size); } else { XFillRectangle (dpy, window, gc, rock->x - rock->size/2, rock->y - rock->size/2, rock->size, rock->size); } } else if (rock->size < MAX_SIZE) { if (threed) { gc = threed_left_gc; XCopyPlane(dpy, pixmaps[rock->size], window, gc, 0, 0, rock->size, rock->size, rock->x - rock->size / 2 - rock->diff, rock->y - rock->size / 2, 1L); gc = threed_right_gc; XCopyPlane(dpy, pixmaps[rock->size], window, gc, 0, 0, rock->size, rock->size, rock->x - rock->size / 2 + rock->diff, rock->y - rock->size / 2, 1L); } else { XCopyPlane (dpy, pixmaps [rock->size], window, gc, 0, 0, rock->size, rock->size, rock->x - rock->size/2, rock->y - rock->size/2, 1L); } } } static void init_pixmaps (Display *dpy, Window window) { int i; XGCValues gcv; GC fg_gc = 0, bg_gc = 0; pixmaps [0] = pixmaps [1] = 0; for (i = MIN_DEPTH; i < MAX_SIZE; i++) { int w = (1+(i/32))<<5; /* server might be faster if word-aligned */ int h = i; Pixmap p = XCreatePixmap (dpy, window, w, h, 1); XPoint points [7]; pixmaps [i] = p; if (! p) { fprintf (stderr, "%s: couldn't allocate pixmaps", progname); exit (1); } if (! fg_gc) { /* must use drawable of pixmap, not window (fmh) */ gcv.foreground = 1; fg_gc = XCreateGC (dpy, p, GCForeground, &gcv); gcv.foreground = 0; bg_gc = XCreateGC (dpy, p, GCForeground, &gcv); } XFillRectangle (dpy, p, bg_gc, 0, 0, w, h); points [0].x = i * 0.15; points [0].y = i * 0.85; points [1].x = i * 0.00; points [1].y = i * 0.20; points [2].x = i * 0.30; points [2].y = i * 0.00; points [3].x = i * 0.40; points [3].y = i * 0.10; points [4].x = i * 0.90; points [4].y = i * 0.10; points [5].x = i * 1.00; points [5].y = i * 0.55; points [6].x = i * 0.45; points [6].y = i * 1.00; XFillPolygon (dpy, p, fg_gc, points, 7, Nonconvex, CoordModeOrigin); } XFreeGC (dpy, fg_gc); XFreeGC (dpy, bg_gc); } static int compute_move(int axe) /* 0 for x, 1 for y */ { static int current_dep[2] = {0, 0}; static int speed[2] = {0, 0}; static short direction[2] = {0, 0}; static int limit[2] = {0, 0}; int change = 0; limit[0] = midx; limit[1] = midy; current_dep[axe] += speed[axe]; /* We adjust the displacement */ if (current_dep[axe] > (int) (limit[axe] * max_dep)) { if (current_dep[axe] > limit[axe]) current_dep[axe] = limit[axe]; direction[axe] = -1; } /* This is when we reach the upper screen limit */ if (current_dep[axe] < (int) (-limit[axe] * max_dep)) { if (current_dep[axe] < -limit[axe]) current_dep[axe] = -limit[axe]; direction[axe] = 1; } /* This is when we reach the lower screen limit */ if (direction[axe] == 1) /* We adjust the speed */ speed[axe] += 1; else if (direction[axe] == -1) speed[axe] -= 1; if (speed[axe] > MAX_DEP_SPEED) speed[axe] = MAX_DEP_SPEED; else if (speed[axe] < -MAX_DEP_SPEED) speed[axe] = -MAX_DEP_SPEED; if (move_p && !(random() % DIRECTION_CHANGE_RATE)) { /* We change direction */ change = random() & 1; if (change != 1) { if (direction[axe] == 0) direction[axe] = change - 1; /* 0 becomes either 1 or -1 */ else direction[axe] = 0; /* -1 or 1 become 0 */ } } return (current_dep[axe]); } static void tick_rocks (int d) { int i; if (move_p) { dep_x = compute_move(0); dep_y = compute_move(1); } for (i = 0; i < nrocks; i++) rock_tick (&rocks [i], d); } static void rocks_once (void) { static int current_delta = 0; /* observer Z rotation */ static int window_tick = 50; static int new_delta = 0; static int dchange_tick = 0; if (window_tick++ == 50) { XWindowAttributes xgwa; XGetWindowAttributes (dpy, window, &xgwa); window_tick = 0; width = xgwa.width; height = xgwa.height; midx = width/2; midy = height/2; } if (current_delta != new_delta) { if (dchange_tick++ == 5) { dchange_tick = 0; if (current_delta < new_delta) current_delta++; else current_delta--; } } else { if (! (random() % 50)) { new_delta = ((random() % 11) - 5); if (! (random() % 10)) new_delta *= 5; } } tick_rocks (current_delta); } static void init_rocks (Display *d, Window w) { int i; XGCValues gcv; Colormap cmap; XWindowAttributes xgwa; unsigned int bg; dpy = d; window = w; XGetWindowAttributes (dpy, window, &xgwa); cmap = xgwa.colormap; delay = get_integer_resource ("delay", "Integer"); if (delay < 0) delay = 0; speed = get_integer_resource ("speed", "Integer"); if (speed < 1) speed = 1; if (speed > 100) speed = 100; rotate_p = get_boolean_resource ("rotate", "Boolean"); move_p = get_boolean_resource ("move", "Boolean"); if (mono_p) ncolors = 2; else ncolors = get_integer_resource ("colors", "Colors"); if (ncolors < 2) { ncolors = 2; mono_p = True; } colors = (XColor *) malloc(ncolors * sizeof(*colors)); draw_gcs = (GC *) malloc(ncolors * sizeof(*draw_gcs)); bg = get_pixel_resource ("background", "Background", dpy, cmap); colors[0].pixel = bg; colors[0].flags = DoRed|DoGreen|DoBlue; XQueryColor(dpy, cmap, &colors[0]); ncolors--; make_random_colormap(dpy, xgwa.visual, cmap, colors+1, &ncolors, True, True, 0, True); ncolors++; if (ncolors < 2) { ncolors = 2; mono_p = True; } if (mono_p) { unsigned int fg = get_pixel_resource("foreground", "Foreground", dpy, cmap); colors[1].pixel = fg; colors[1].flags = DoRed|DoGreen|DoBlue; XQueryColor(dpy, cmap, &colors[1]); gcv.foreground = fg; gcv.background = bg; draw_gcs[0] = XCreateGC (dpy, window, GCForeground|GCBackground, &gcv); draw_gcs[1] = draw_gcs[0]; } else for( i = 0; i < ncolors; i++ ) { gcv.foreground = colors[i].pixel; gcv.background = bg; draw_gcs[i] = XCreateGC (dpy, window, GCForeground|GCBackground, &gcv); } gcv.foreground = bg; erase_gc = XCreateGC (dpy, window, GCForeground|GCBackground, &gcv); max_dep = (move_p ? MAX_DEP : 0); for (i = 0; i < SIN_RESOLUTION; i++) { sins [i] = sin ((((double) i) / (SIN_RESOLUTION / 2)) * M_PI); coss [i] = cos ((((double) i) / (SIN_RESOLUTION / 2)) * M_PI); } /* we actually only need i/speed of these, but wtf */ for (i = 1; i < (sizeof (depths) / sizeof (depths[0])); i++) depths [i] = atan (((double) 0.5) / (((double) i) / DEPTH_SCALE)); depths [0] = M_PI/2; /* avoid division by 0 */ threed = get_boolean_resource("use3d", "Boolean"); if (threed) { gcv.background = bg; gcv.foreground = get_pixel_resource ("left3d", "Foreground", dpy, cmap); threed_left_gc = XCreateGC (dpy, window, GCForeground|GCBackground,&gcv); gcv.foreground = get_pixel_resource ("right3d", "Foreground", dpy, cmap); threed_right_gc = XCreateGC (dpy, window,GCForeground|GCBackground,&gcv); threed_delta = get_float_resource("delta3d", "Integer"); } /* don't want any exposure events from XCopyPlane */ for( i = 0; i < ncolors; i++) XSetGraphicsExposures (dpy, draw_gcs[i], False); XSetGraphicsExposures (dpy, erase_gc, False); nrocks = get_integer_resource ("count", "Count"); if (nrocks < 1) nrocks = 1; rocks = (struct rock *) calloc (nrocks, sizeof (struct rock)); init_pixmaps (dpy, window); XClearWindow (dpy, window); } char *progclass = "Rocks"; char *defaults [] = { ".background: Black", ".foreground: #E9967A", "*colors: 5", "*count: 100", "*delay: 50000", "*speed: 100", "*rotate: true", "*move: true", "*use3d: False", "*left3d: Blue", "*right3d: Red", "*delta3d: 1.5", 0 }; XrmOptionDescRec options [] = { { "-count", ".count", XrmoptionSepArg, 0 }, { "-rotate", ".rotate", XrmoptionNoArg, "true" }, { "-norotate", ".rotate", XrmoptionNoArg, "false" }, { "-move", ".move", XrmoptionNoArg, "true" }, { "-nomove", ".move", XrmoptionNoArg, "false" }, { "-delay", ".delay", XrmoptionSepArg, 0 }, { "-speed", ".speed", XrmoptionSepArg, 0 }, {"-3d", ".use3d", XrmoptionNoArg, "True"}, {"-no-3d", ".use3d", XrmoptionNoArg, "False"}, {"-left3d", ".left3d", XrmoptionSepArg, 0 }, {"-right3d", ".right3d", XrmoptionSepArg, 0 }, {"-delta3d", ".delta3d", XrmoptionSepArg, 0 }, { "-colors", ".colors", XrmoptionSepArg, 0 }, { 0, 0, 0, 0 } }; void screenhack (Display *dpy, Window window) { init_rocks (dpy, window); while (1) { rocks_once (); XSync (dpy, False); screenhack_handle_events (dpy); if (delay) usleep (delay); } }