--- /dev/null
+/* xscreensaver, Copyright (c) 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.
+ */
+
+#include <math.h>
+#include "screenhack.h"
+
+#define countof(x) (sizeof(x)/sizeof(*(x)))
+#define ABS(x) ((x)<0?-(x):(x))
+
+struct throbber {
+ int x, y;
+ int size;
+ int max_size;
+ int thickness;
+ int speed;
+ int fuse;
+ GC gc;
+ void (*draw) (Display *, Drawable, struct throbber *);
+};
+
+static void
+draw_star (Display *dpy, Drawable w, struct throbber *t)
+{
+ XPoint points[11];
+ int x = t->x;
+ int y = t->y;
+ int s = t->size / 0.383; /* trial and error, I forget how to derive this */
+ int s2 = t->size;
+ double c = M_PI * 2;
+ double o = -M_PI / 2;
+
+ points[0].x = x + s * cos(o + 0.0*c); points[0].y = y + s * sin(o + 0.0*c);
+ points[1].x = x + s2 * cos(o + 0.1*c); points[1].y = y + s2 * sin(o + 0.1*c);
+ points[2].x = x + s * cos(o + 0.2*c); points[2].y = y + s * sin(o + 0.2*c);
+ points[3].x = x + s2 * cos(o + 0.3*c); points[3].y = y + s2 * sin(o + 0.3*c);
+ points[4].x = x + s * cos(o + 0.4*c); points[4].y = y + s * sin(o + 0.4*c);
+ points[5].x = x + s2 * cos(o + 0.5*c); points[5].y = y + s2 * sin(o + 0.5*c);
+ points[6].x = x + s * cos(o + 0.6*c); points[6].y = y + s * sin(o + 0.6*c);
+ points[7].x = x + s2 * cos(o + 0.7*c); points[7].y = y + s2 * sin(o + 0.7*c);
+ points[8].x = x + s * cos(o + 0.8*c); points[8].y = y + s * sin(o + 0.8*c);
+ points[9].x = x + s2 * cos(o + 0.9*c); points[9].y = y + s2 * sin(o + 0.9*c);
+ points[10] = points[0];
+
+ XDrawLines (dpy, w, t->gc, points, countof(points), CoordModeOrigin);
+}
+
+static void
+draw_circle (Display *dpy, Drawable w, struct throbber *t)
+{
+ XDrawArc (dpy, w, t->gc,
+ t->x - t->size / 2,
+ t->y - t->size / 2,
+ t->size, t->size,
+ 0, 360*64);
+}
+
+static void
+draw_hlines (Display *dpy, Drawable w, struct throbber *t)
+{
+ XDrawLine (dpy, w, t->gc, 0,
+ t->y - t->size, t->max_size,
+ t->y - t->size);
+ XDrawLine (dpy, w, t->gc, 0,
+ t->y + t->size, t->max_size,
+ t->y + t->size);
+}
+
+static void
+draw_vlines (Display *dpy, Drawable w, struct throbber *t)
+{
+ XDrawLine (dpy, w, t->gc,
+ t->x - t->size, 0,
+ t->x - t->size, t->max_size);
+ XDrawLine (dpy, w, t->gc,
+ t->x + t->size, 0,
+ t->x + t->size, t->max_size);
+}
+
+static void
+draw_corners (Display *dpy, Drawable w, struct throbber *t)
+{
+ int s = (t->size + t->thickness) / 2;
+ XPoint points[3];
+
+ points[0].x = 0; points[0].y = t->y - s;
+ points[1].x = t->x - s; points[1].y = t->y - s;
+ points[2].x = t->x - s; points[2].y = 0;
+ XDrawLines (dpy, w, t->gc, points, countof(points), CoordModeOrigin);
+
+ points[0].x = 0; points[0].y = t->y + s;
+ points[1].x = t->x - s; points[1].y = t->y + s;
+ points[2].x = t->x - s; points[2].y = t->max_size;
+ XDrawLines (dpy, w, t->gc, points, countof(points), CoordModeOrigin);
+
+ points[0].x = t->x + s; points[0].y = 0;
+ points[1].x = t->x + s; points[1].y = t->y - s;
+ points[2].x = t->max_size; points[2].y = t->y - s;
+ XDrawLines (dpy, w, t->gc, points, countof(points), CoordModeOrigin);
+
+ points[0].x = t->x + s; points[0].y = t->max_size;
+ points[1].x = t->x + s; points[1].y = t->y + s;
+ points[2].x = t->max_size; points[2].y = t->y + s;
+ XDrawLines (dpy, w, t->gc, points, countof(points), CoordModeOrigin);
+}
+
+
+static struct throbber *
+make_throbber (Display *dpy, Drawable d, int w, int h, unsigned long pixel)
+{
+ XGCValues gcv;
+ struct throbber *t = (struct throbber *) malloc (sizeof (*t));
+ t->x = w / 2;
+ t->y = h / 2;
+ t->max_size = w;
+ t->speed = get_integer_resource ("speed", "Speed");
+ t->fuse = 1 + (random() % 4);
+ t->thickness = get_integer_resource ("thickness", "Thickness");
+
+ if (t->speed < 0) t->speed = -t->speed;
+ t->speed += (((random() % t->speed) / 2) - (t->speed / 2));
+ if (t->speed > 0) t->speed = -t->speed;
+
+ if (random() % 4)
+ t->size = t->max_size;
+ else
+ t->size = t->thickness, t->speed = -t->speed;
+
+ gcv.foreground = pixel;
+ gcv.line_width = t->thickness;
+ gcv.line_style = LineSolid;
+ gcv.cap_style = CapProjecting;
+ gcv.join_style = JoinMiter;
+ t->gc = XCreateGC (dpy, d,
+ (GCForeground|GCLineWidth|GCLineStyle|
+ GCCapStyle|GCJoinStyle),
+ &gcv);
+
+ switch (random() % 11) {
+ case 0: case 1: case 2: case 3: t->draw = draw_star; break;
+ case 4: case 5: case 6: case 7: t->draw = draw_circle; break;
+ case 8: t->draw = draw_hlines; break;
+ case 9: t->draw = draw_vlines; break;
+ case 10: t->draw = draw_corners; break;
+ default: abort(); break;
+ }
+
+ return t;
+}
+
+static int
+throb (Display *dpy, Drawable window, struct throbber *t)
+{
+ t->size += t->speed;
+ if (t->size <= (t->thickness / 2))
+ {
+ t->speed = -t->speed;
+ t->size += (t->speed * 2);
+ }
+ else if (t->size > t->max_size)
+ {
+ t->speed = -t->speed;
+ t->size += (t->speed * 2);
+ t->fuse--;
+ }
+
+ if (t->fuse <= 0)
+ {
+ XFreeGC (dpy, t->gc);
+ memset (t, 0, sizeof(*t));
+ free (t);
+ return -1;
+ }
+ else
+ {
+ t->draw (dpy, window, t);
+ return 0;
+ }
+}
+
+
+\f
+char *progclass = "Deluxe";
+
+char *defaults [] = {
+ ".background: black",
+ ".foreground: white",
+ "*delay: 5000",
+ "*count: 5",
+ "*thickness: 50",
+ "*speed: 15",
+ "*ncolors: 20",
+ "*doubleBuffer: True",
+ 0
+};
+
+XrmOptionDescRec options [] = {
+ { "-delay", ".delay", XrmoptionSepArg, 0 },
+ { "-thickness", ".thickness", XrmoptionSepArg, 0 },
+ { "-count", ".count", XrmoptionSepArg, 0 },
+ { "-ncolors", ".ncolors", XrmoptionSepArg, 0 },
+ { "-speed", ".speed", XrmoptionSepArg, 0 },
+ { 0, 0, 0, 0 }
+};
+
+void
+screenhack (Display *dpy, Window window)
+{
+ int count = get_integer_resource ("count", "Integer");
+ int delay = get_integer_resource ("delay", "Integer");
+ int ncolors = get_integer_resource ("ncolors", "Integer");
+ Bool dbuf = get_boolean_resource ("doubleBuffer", "Boolean");
+ XColor colors[255];
+ XGCValues gcv;
+ GC erase_gc = 0;
+ int i;
+ struct throbber **throbbers;
+ XWindowAttributes xgwa;
+ Pixmap b=0, ba=0, bb=0; /* double-buffer to reduce flicker */
+
+ XGetWindowAttributes (dpy, window, &xgwa);
+ make_random_colormap (dpy, xgwa.visual, xgwa.colormap,
+ colors, &ncolors, True, True, 0, True);
+
+ if (dbuf)
+ {
+ ba = XCreatePixmap (dpy, window, xgwa.width, xgwa.height, xgwa.depth);
+ bb = XCreatePixmap (dpy, window, xgwa.width, xgwa.height, xgwa.depth);
+ b = ba;
+ }
+ else
+ {
+ b = window;
+ }
+
+ throbbers = (struct throbber **) calloc (count, sizeof(struct throbber *));
+ for (i = 0; i < count; i++)
+ throbbers[i] = make_throbber (dpy, b, xgwa.width, xgwa.height,
+ colors[random() % ncolors].pixel);
+
+ if (dbuf)
+ {
+ gcv.foreground = get_pixel_resource ("background", "Background",
+ dpy, xgwa.colormap);
+ erase_gc = XCreateGC (dpy, b, GCForeground, &gcv);
+ XFillRectangle (dpy, ba, erase_gc, 0, 0, xgwa.width, xgwa.height);
+ XFillRectangle (dpy, bb, erase_gc, 0, 0, xgwa.width, xgwa.height);
+ }
+
+ while (1)
+ {
+ if (dbuf)
+ XFillRectangle (dpy, b, erase_gc, 0, 0, xgwa.width, xgwa.height);
+ else
+ XClearWindow (dpy, b);
+
+ for (i = 0; i < count; i++)
+ if (throb (dpy, b, throbbers[i]) < 0)
+ throbbers[i] = make_throbber (dpy, b, xgwa.width, xgwa.height,
+ colors[random() % ncolors].pixel);
+ if (dbuf)
+ {
+ XCopyArea (dpy, b, window, erase_gc, 0, 0,
+ xgwa.width, xgwa.height, 0, 0);
+ b = (b == ba ? bb : ba);
+ }
+
+ XSync (dpy, False);
+ screenhack_handle_events (dpy);
+ if (delay)
+ usleep (delay);
+ }
+}
projects / xscreensaver / blobdiff