--- /dev/null
+/* xscreensaver, Copyright (c) 1993, 1995, 1996, 1997, 1998, 1999
+ * Jamie Zawinski <jwz@jwz.org>
+ *
+ * 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.
+ */
+
+/* I wanted to lay down new circles with TV:ALU-ADD instead of TV:ALU-XOR,
+ but X doesn't support arithmetic combinations of pixmaps!! What losers.
+ I suppose I could crank out the 2's compliment math by hand, but that's
+ a real drag...
+
+ This would probably look good with shapes other than circles as well.
+
+ */
+
+#include "screenhack.h"
+#include <stdio.h>
+
+struct circle {
+ int x, y, radius;
+ int increment;
+ int dx, dy;
+};
+
+static enum color_mode {
+ seuss_mode, ramp_mode, random_mode
+} cmode;
+
+
+static struct circle *circles;
+static int count, global_count;
+static Pixmap pixmap, buffer;
+static int width, height, global_inc;
+static int delay, delay2, cycle_delay;
+static unsigned long fg_pixel, bg_pixel;
+static GC draw_gc, erase_gc, copy_gc, merge_gc;
+static Bool anim_p;
+static Colormap cmap;
+
+static int ncolors;
+static XColor *colors;
+static Bool cycle_p;
+static int fg_index;
+static int bg_index;
+
+
+#define min(x,y) ((x)<(y)?(x):(y))
+#define max(x,y) ((x)>(y)?(x):(y))
+
+static void
+init_circles_1 (Display *dpy, Window window)
+{
+ int i;
+ count = (global_count ? global_count
+ : (3 + (random () % max (1, (min (width, height) / 50)))
+ + (random () % max (1, (min (width, height) / 50)))));
+ circles = (struct circle *) malloc (count * sizeof (struct circle));
+ for (i = 0; i < count; i++)
+ {
+ circles [i].x = 10 + random () % (width - 20);
+ circles [i].y = 10 + random () % (height - 20);
+ if (global_inc)
+ circles [i].increment = global_inc;
+ else
+ { /* prefer smaller increments to larger ones */
+ int j = 8;
+ int inc = ((random()%j) + (random()%j) + (random()%j)) - ((j*3)/2);
+ if (inc < 0) inc = -inc + 3;
+ circles [i].increment = inc + 3;
+ }
+ circles [i].radius = random () % circles [i].increment;
+ circles [i].dx = ((random () % 3) - 1) * (1 + random () % 5);
+ circles [i].dy = ((random () % 3) - 1) * (1 + random () % 5);
+ }
+}
+
+static void
+init_circles (Display *dpy, Window window)
+{
+ XGCValues gcv;
+ XWindowAttributes xgwa;
+ char *mode_str = 0;
+ XGetWindowAttributes (dpy, window, &xgwa);
+ cmap = xgwa.colormap;
+ global_count = get_integer_resource ("count", "Integer");
+ if (global_count < 0) global_count = 0;
+ global_inc = get_integer_resource ("increment", "Integer");
+ if (global_inc < 0) global_inc = 0;
+ anim_p = get_boolean_resource ("animate", "Boolean");
+ delay = get_integer_resource ("delay", "Integer");
+ delay2 = get_integer_resource ("delay2", "Integer") * 1000000;
+ cycle_delay = get_integer_resource ("cycleDelay", "Integer");
+ mode_str = get_string_resource ("colorMode", "ColorMode");
+ if (! mode_str) cmode = random_mode;
+ else if (!strcmp (mode_str, "seuss")) cmode = seuss_mode;
+ else if (!strcmp (mode_str, "ramp")) cmode = ramp_mode;
+ else if (!strcmp (mode_str, "random")) cmode = random_mode;
+ else {
+ fprintf (stderr,
+ "%s: colorMode must be seuss, ramp, or random, not \"%s\"\n",
+ progname, mode_str);
+ exit (1);
+ }
+
+ if (mono_p) cmode = seuss_mode;
+ if (cmode == random_mode)
+ cmode = ((random()&3) == 1) ? ramp_mode : seuss_mode;
+
+ if (cmode == ramp_mode)
+ anim_p = False; /* This combo doesn't work right... */
+
+ ncolors = get_integer_resource ("colors", "Colors");
+ if (ncolors < 2) ncolors = 2;
+ if (ncolors <= 2) mono_p = True;
+
+ if (mono_p)
+ colors = 0;
+ else
+ colors = (XColor *) malloc(sizeof(*colors) * (ncolors+1));
+
+ cycle_p = mono_p ? False : get_boolean_resource ("cycle", "Cycle");
+
+ /* If the visual isn't color-indexed, don't bother trying to
+ allocate writable cells. */
+ if (cycle_p && !has_writable_cells (xgwa.screen, xgwa.visual))
+ cycle_p = False;
+
+
+ if (mono_p)
+ ;
+ else if (random() % (cmode == seuss_mode ? 2 : 10))
+ make_uniform_colormap (dpy, xgwa.visual, cmap, colors, &ncolors,
+ True, &cycle_p, True);
+ else
+ make_smooth_colormap (dpy, xgwa.visual, cmap, colors, &ncolors,
+ True, &cycle_p, True);
+
+ if (ncolors <= 2) mono_p = True;
+ if (mono_p) cycle_p = False;
+ if (mono_p) cmode = seuss_mode;
+
+ if (mono_p)
+ {
+ fg_pixel = get_pixel_resource ("foreground", "Foreground", dpy, cmap);
+ bg_pixel = get_pixel_resource ("background", "Background", dpy, cmap);
+ }
+ else
+ {
+ fg_index = 0;
+ bg_index = ncolors / 4;
+ if (fg_index == bg_index) bg_index++;
+ fg_pixel = colors[fg_index].pixel;
+ bg_pixel = colors[bg_index].pixel;
+ }
+
+ width = max (50, xgwa.width);
+ height = max (50, xgwa.height);
+
+#ifdef DEBUG
+ width/=2; height/=2;
+#endif
+
+ pixmap = XCreatePixmap (dpy, window, width, height, 1);
+ if (cmode == seuss_mode)
+ buffer = XCreatePixmap (dpy, window, width, height, 1);
+ else
+ buffer = 0;
+
+ gcv.foreground = 1;
+ gcv.background = 0;
+ draw_gc = XCreateGC (dpy, pixmap, GCForeground | GCBackground, &gcv);
+ gcv.foreground = 0;
+ erase_gc = XCreateGC (dpy, pixmap, GCForeground, &gcv);
+ gcv.foreground = fg_pixel;
+ gcv.background = bg_pixel;
+ copy_gc = XCreateGC (dpy, window, GCForeground | GCBackground, &gcv);
+
+ if (cmode == seuss_mode)
+ {
+ gcv.foreground = 1;
+ gcv.background = 0;
+ gcv.function = GXxor;
+ merge_gc = XCreateGC (dpy, pixmap,
+ GCForeground | GCBackground | GCFunction, &gcv);
+ }
+ else
+ {
+ gcv.foreground = fg_pixel;
+ gcv.background = bg_pixel;
+ gcv.function = GXcopy;
+ merge_gc = XCreateGC (dpy, window,
+ GCForeground | GCBackground | GCFunction, &gcv);
+ }
+
+ init_circles_1 (dpy, window);
+ XClearWindow (dpy, window);
+ if (buffer) XFillRectangle (dpy, buffer, erase_gc, 0, 0, width, height);
+}
+
+static void
+run_circles (Display *dpy, Window window)
+{
+ int i;
+ static int iterations = 0;
+ static int oiterations = 0;
+ static Bool first_time_p = True;
+ Bool done = False;
+ Bool inhibit_sleep = False;
+ static int clear_tick = 0;
+
+ XFillRectangle (dpy, pixmap, erase_gc, 0, 0, width, height);
+ for (i = 0; i < count; i++)
+ {
+ int radius = circles [i].radius;
+ int inc = circles [i].increment;
+
+ if (! (iterations & 1)) /* never stop on an odd number of iterations */
+ ;
+ else if (radius == 0) /* eschew inf */
+ ;
+ else if (radius < 0) /* stop when the circles are points */
+ done = True;
+ else /* stop when the circles fill the window */
+ {
+ /* Probably there's a simpler way to ask the musical question,
+ "is this square completely enclosed by this circle," but I've
+ forgotten too much trig to know it... (That's not really the
+ right question anyway, but the right question is too hard.) */
+ double x1 = ((double) (-circles [i].x)) / ((double) radius);
+ double y1 = ((double) (-circles [i].y)) / ((double) radius);
+ double x2 = ((double) (width - circles [i].x)) / ((double) radius);
+ double y2 = ((double) (height - circles [i].y)) / ((double) radius);
+ x1 *= x1; x2 *= x2; y1 *= y1; y2 *= y2;
+ if ((x1 + y1) < 1 && (x2 + y2) < 1 && (x1 + y2) < 1 && (x2 + y1) < 1)
+ done = True;
+ }
+
+ if (radius > 0 &&
+ (cmode == seuss_mode || /* drawing all circles, or */
+ circles [0].increment < 0)) /* on the way back in */
+ {
+ XFillArc (dpy,
+ (cmode == seuss_mode ? pixmap : window),
+ (cmode == seuss_mode ? draw_gc : merge_gc),
+ circles [i].x - radius, circles [i].y - radius,
+ radius * 2, radius * 2, 0, 360*64);
+ }
+ circles [i].radius += inc;
+ }
+
+ if (cycle_p && cmode != seuss_mode)
+ {
+ struct timeval now;
+ static struct timeval then = { 0, };
+ unsigned long diff;
+#ifdef GETTIMEOFDAY_TWO_ARGS
+ struct timezone tzp;
+ gettimeofday(&now, &tzp);
+#else
+ gettimeofday(&now);
+#endif
+ diff = (((now.tv_sec - then.tv_sec) * 1000000) +
+ (now.tv_usec - then.tv_usec));
+ if (diff > cycle_delay)
+ {
+ rotate_colors (dpy, cmap, colors, ncolors, 1);
+ then = now;
+ }
+ }
+
+ if (anim_p && !first_time_p)
+ inhibit_sleep = !done;
+
+ if (done)
+ {
+ if (anim_p)
+ {
+ first_time_p = False;
+ for (i = 0; i < count; i++)
+ {
+ circles [i].x += circles [i].dx;
+ circles [i].y += circles [i].dy;
+ circles [i].radius %= circles [i].increment;
+ if (circles [i].x < 0 || circles [i].x >= width)
+ {
+ circles [i].dx = -circles [i].dx;
+ circles [i].x += (2 * circles [i].dx);
+ }
+ if (circles [i].y < 0 || circles [i].y >= height)
+ {
+ circles [i].dy = -circles [i].dy;
+ circles [i].y += (2 * circles [i].dy);
+ }
+ }
+ }
+ else if (circles [0].increment < 0)
+ {
+ /* We've zoomed out and the screen is blank -- re-pick the
+ center points, and shift the colors.
+ */
+ free (circles);
+ init_circles_1 (dpy, window);
+ if (! mono_p)
+ {
+ fg_index = (fg_index + 1) % ncolors;
+ bg_index = (fg_index + (ncolors/2)) % ncolors;
+ XSetForeground (dpy, copy_gc, colors [fg_index].pixel);
+ XSetBackground (dpy, copy_gc, colors [bg_index].pixel);
+ }
+ }
+ /* Sometimes go out from the inside instead of the outside */
+ else if (clear_tick == 0 && ((random () % 3) == 0))
+ {
+ iterations = 0; /* ick */
+ for (i = 0; i < count; i++)
+ circles [i].radius %= circles [i].increment;
+
+ clear_tick = ((random() % 8) + 4) | 1; /* must be odd */
+ }
+ else
+ {
+ oiterations = iterations;
+ for (i = 0; i < count; i++)
+ {
+ circles [i].increment = -circles [i].increment;
+ circles [i].radius += (2 * circles [i].increment);
+ }
+ }
+ }
+
+ if (buffer)
+ XCopyPlane (dpy, pixmap, buffer, merge_gc, 0, 0, width, height, 0, 0, 1);
+ else if (cmode != seuss_mode)
+ {
+
+ if (!mono_p)
+ {
+ fg_index++;
+ bg_index++;
+ if (fg_index >= ncolors) fg_index = 0;
+ if (bg_index >= ncolors) bg_index = 0;
+ XSetForeground (dpy, merge_gc, colors [fg_index].pixel);
+ }
+
+ if (circles [0].increment >= 0)
+ inhibit_sleep = True;
+ else if (done && cmode == seuss_mode)
+ XFillRectangle (dpy, window, merge_gc, 0, 0, width, height);
+ }
+ else
+ XCopyPlane (dpy, pixmap, window, merge_gc, 0, 0, width, height, 0, 0, 1);
+
+ /* buffer is only used in seuss-mode or anim-mode */
+ if (buffer && (anim_p
+ ? (done || (first_time_p && (iterations & 1)))
+ : (iterations & 1)))
+ {
+ XCopyPlane (dpy, buffer, window, copy_gc, 0, 0, width, height, 0, 0, 1);
+ XSync (dpy, False);
+ if (anim_p && done)
+ XFillRectangle (dpy, buffer, erase_gc, 0, 0, width, height);
+ }
+
+#ifdef DEBUG
+ XCopyPlane (dpy, pixmap, window, copy_gc, 0,0,width,height,width,height, 1);
+ if (buffer)
+ XCopyPlane (dpy, buffer, window, copy_gc, 0,0,width,height,0,height, 1);
+ XSync (dpy, False);
+#endif
+
+ if (done)
+ iterations = 0;
+ else
+ iterations++;
+
+ if (delay && !inhibit_sleep)
+ {
+ static Bool really_first_p = True;
+ int direction = 1;
+ int d = delay;
+ if (done && cycle_p && cmode != seuss_mode && !really_first_p)
+ {
+ d = delay2;
+ if (! (random() % 10))
+ direction = -1;
+ }
+
+ XSync(dpy, False);
+ screenhack_handle_events (dpy);
+
+ if (cycle_p && cycle_delay)
+ {
+ int i = 0;
+ while (i < d)
+ {
+ rotate_colors (dpy, cmap, colors, ncolors, direction);
+ usleep(cycle_delay);
+ screenhack_handle_events (dpy);
+ i += cycle_delay;
+ }
+ }
+ else if (cmode != seuss_mode &&
+ done && !really_first_p && cycle_delay > 0)
+ usleep (cycle_delay * 50);
+ else
+ usleep (d);
+
+ if (done)
+ really_first_p = False;
+ }
+
+ if (done && clear_tick > 0)
+ {
+ clear_tick--;
+ if (!clear_tick)
+ {
+ XClearWindow (dpy, window);
+ if (buffer) XFillRectangle (dpy, buffer, erase_gc, 0,0,width,height);
+ }
+ }
+}
+
+\f
+char *progclass = "Halo";
+
+char *defaults [] = {
+ ".background: black",
+ ".foreground: white",
+ "*colorMode: random",
+ "*colors: 100",
+ "*cycle: true",
+ "*count: 0",
+ "*delay: 100000",
+ "*delay2: 20",
+ "*cycleDelay: 100000",
+ 0
+};
+
+XrmOptionDescRec options [] = {
+ { "-count", ".count", XrmoptionSepArg, 0 },
+ { "-delay", ".delay", XrmoptionSepArg, 0 },
+ { "-cycle-delay", ".cycleDelay", XrmoptionSepArg, 0 },
+ { "-animate", ".animate", XrmoptionNoArg, "True" },
+ { "-mode", ".colorMode", XrmoptionSepArg, 0 },
+ { "-colors", ".colors", XrmoptionSepArg, 0 },
+ { "-cycle", ".cycle", XrmoptionNoArg, "True" },
+ { "-no-cycle", ".cycle", XrmoptionNoArg, "False" },
+ { 0, 0, 0, 0 }
+};
+
+void
+screenhack (Display *dpy, Window window)
+{
+ init_circles (dpy, window);
+ while (1)
+ {
+ run_circles (dpy, window);
+ screenhack_handle_events (dpy);
+ }
+}
projects / xscreensaver / blobdiff