+++ /dev/null
-/* xscreensaver, Copyright (c) 1992, 1994 Jamie Zawinski <jwz@netscape.com>
- *
- * 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.
- */
-
-/* Draw some fireworks. Inspired from TI Explorer Lisp code by
- John S. Pezaris <pz@hx.lcs.mit.edu>
- */
-
-#include "screenhack.h"
-
-struct projectile {
- int x, y; /* position */
- int dx, dy; /* velocity */
- int decay;
- int size;
- int fuse;
- Bool primary;
- Bool dead;
- XColor color;
- struct projectile *next_free;
-};
-
-static struct projectile *projectiles, *free_projectiles;
-
-static struct projectile *
-get_projectile ()
-{
- struct projectile *p;
- if (free_projectiles)
- {
- p = free_projectiles;
- free_projectiles = p->next_free;
- p->next_free = 0;
- p->dead = False;
- return p;
- }
- else
- return 0;
-}
-
-static void
-free_projectile (p)
- struct projectile *p;
-{
- p->next_free = free_projectiles;
- free_projectiles = p;
- p->dead = True;
-}
-
-static void
-launch (xlim, ylim, g, dpy, cmap)
- int xlim, ylim, g;
- Display *dpy;
- Colormap cmap;
-{
- struct projectile *p = get_projectile ();
- int x, dx, xxx;
- if (! p) return;
-
- do {
- x = (random () % xlim);
- dx = 30000 - (random () % 60000);
- xxx = x + (dx * 200);
- } while (xxx <= 0 || xxx >= xlim);
-
- p->x = x;
- p->y = ylim;
- p->dx = dx;
- p->size = 8000;
- p->decay = 0;
- p->dy = (random () % 4000) - 13000;
- p->fuse = ((((random () % 500) + 500) * abs (p->dy / g)) / 1000);
- p->primary = True;
-
- if (! mono_p)
- {
- hsv_to_rgb (random () % 360, 1.0, 1.0,
- &p->color.red, &p->color.green, &p->color.blue);
- p->color.flags = DoRed | DoGreen | DoBlue;
- if (!XAllocColor (dpy, cmap, &p->color))
- {
- p->color.pixel = WhitePixel (dpy, DefaultScreen (dpy));
- p->color.red = p->color.green = p->color.blue = 0;
- }
- }
-}
-
-static struct projectile *
-shrapnel (parent, dpy, cmap)
- struct projectile *parent;
- Display *dpy;
- Colormap cmap;
-{
- struct projectile *p = get_projectile ();
- if (! p) return 0;
- p->x = parent->x;
- p->y = parent->y;
- p->dx = (random () % 5000) - 2500 + parent->dx;
- p->dy = (random () % 5000) - 2500 + parent->dy;
- p->decay = (random () % 50) - 60;
- p->size = (parent->size * 2) / 3;
- p->fuse = 0;
- p->primary = False;
-
- p->color = parent->color;
- if (! mono_p)
- XAllocColor (dpy, cmap, &p->color); /* dup the lock */
-
- return p;
-}
-
-static GC draw_gc, erase_gc;
-static unsigned int default_fg_pixel;
-
-static int how_many, frequency, scatter;
-
-static Colormap
-init_pyro (dpy, window)
- Display *dpy;
- Window window;
-{
- int i;
- Colormap cmap;
- XGCValues gcv;
- XWindowAttributes xgwa;
- XGetWindowAttributes (dpy, window, &xgwa);
- cmap = xgwa.colormap;
- how_many = get_integer_resource ("count", "Integer");
- frequency = get_integer_resource ("frequency", "Integer");
- scatter = get_integer_resource ("scatter", "Integer");
- if (how_many <= 0) how_many = 100;
- if (frequency <= 0) frequency = 30;
- if (scatter <= 0) scatter = 20;
- projectiles = 0;
- free_projectiles = 0;
- projectiles = (struct projectile *)
- calloc (how_many, sizeof (struct projectile));
- for (i = 0; i < how_many; i++)
- free_projectile (&projectiles [i]);
- gcv.foreground = default_fg_pixel =
- 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);
- XClearWindow (dpy, window);
- return cmap;
-}
-
-static void
-pyro (dpy, window, cmap)
- Display *dpy;
- Window window;
- Colormap cmap;
-{
- XWindowAttributes xgwa;
- static int xlim, ylim, real_xlim, real_ylim;
- int g = 100;
- int i;
-
- if ((random () % frequency) == 0)
- {
- XGetWindowAttributes (dpy, window, &xgwa);
- real_xlim = xgwa.width;
- real_ylim = xgwa.height;
- xlim = real_xlim * 1000;
- ylim = real_ylim * 1000;
- launch (xlim, ylim, g, dpy, cmap);
- }
-
- XSync (dpy, True);
- usleep (10000);
-
- for (i = 0; i < how_many; i++)
- {
- struct projectile *p = &projectiles [i];
- int old_x, old_y, old_size;
- int size, x, y;
- if (p->dead) continue;
- old_x = p->x >> 10;
- old_y = p->y >> 10;
- old_size = p->size >> 10;
- size = (p->size += p->decay) >> 10;
- x = (p->x += p->dx) >> 10;
- y = (p->y += p->dy) >> 10;
- p->dy += (p->size >> 6);
- if (p->primary) p->fuse--;
-
- /* erase old one */
- XFillRectangle (dpy, window, erase_gc, old_x, old_y,
- old_size, old_size);
-
- if ((p->primary ? (p->fuse > 0) : (p->size > 0)) &&
- x < real_xlim &&
- y < real_ylim &&
- x > 0 &&
- y > 0)
- {
- if (mono_p || p->primary)
- XSetForeground (dpy, draw_gc, default_fg_pixel);
- else
- XSetForeground (dpy, draw_gc, p->color.pixel);
-
- if /*(p->primary)*/ (size > 2)
- XFillArc (dpy, window, draw_gc, x, y, size, size, 0, 360*64);
- else
- XFillRectangle (dpy, window, draw_gc, x, y, size, size);
- }
- else
- {
- free_projectile (p);
- if (! mono_p) XFreeColors (dpy, cmap, &p->color.pixel, 1, 0);
- }
-
- if (p->primary && p->fuse <= 0)
- {
- int i = (random () % scatter) + (scatter/2);
- while (i--)
- shrapnel (p, dpy, cmap);
- }
- }
-}
-
-\f
-char *progclass = "Pyro";
-
-char *defaults [] = {
- "Pyro.background: black", /* to placate SGI */
- "Pyro.foreground: white",
- "*count: 100",
- "*frequency: 30",
- "*scatter: 20",
- "*geometry: 800x500",
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-count", ".count", XrmoptionSepArg, 0 },
- { "-frequency", ".frequency", XrmoptionSepArg, 0 },
- { "-scatter", ".scatter", XrmoptionSepArg, 0 }
-};
-int options_size = (sizeof (options) / sizeof (options[0]));
-
-void
-screenhack (dpy, window)
- Display *dpy;
- Window window;
-{
- Colormap cmap = init_pyro (dpy, window);
- while (1)
- pyro (dpy, window, cmap);
-}
projects / xscreensaver / blobdiff