*
* Concept snarfed from Michael D. Bayne in
* http://www.go2net.com/internet/deep/1997/04/16/body.html
+ *
+ * Changes by Lars Huttar, http://www.huttar.net:
+ * - allow use of golden ratio for dividing rectangles instead of 1/2.
+ * - allow smooth colors instead of random
+ * - added line thickness setting
+ * - added "Mondrian" mode
+ * Other ideas:
+ * - allow recomputing the colormap on each new frame (especially useful
+ * when ncolors is low)
*/
#include "screenhack.h"
int max_depth;
int min_height;
int min_width;
+ int line_width;
+ int old_line_width;
+ Bool goldenRatio;
+ Bool mondrian;
+ Bool smoothColors;
+
int delay;
XWindowAttributes xgwa;
GC fgc, bgc;
int current_color;
};
+/* Golden Ratio
+ * Suppose you're dividing a rectangle of length A+B
+ * into two parts, of length A and B respectively. You want the ratio of
+ * A to B to be the same as the ratio of the whole (A+B) to A. The golden
+ * ratio (phi) is that ratio. Supposed to be visually pleasing. */
+#define PHI 1.61803
+#define PHI1 (1.0/PHI)
+#define PHI2 (1.0 - PHI1)
+
+/* copied from make_random_colormap in colors.c */
+static void
+make_mondrian_colormap (Display *dpy, Visual *visual, Colormap cmap,
+ XColor *colors, int *ncolorsP,
+ Bool allocate_p,
+ Bool *writable_pP,
+ Bool verbose_p)
+{
+ Bool wanted_writable = (allocate_p && writable_pP && *writable_pP);
+ int ncolors = 8;
+ int i;
+ Screen *screen = (dpy ? DefaultScreenOfDisplay(dpy) : 0); /* #### WRONG! */
+
+ if (*ncolorsP <= 0) return;
+
+ /* If this visual doesn't support writable cells, don't bother trying. */
+ if (wanted_writable && !has_writable_cells(screen, visual))
+ *writable_pP = False;
+
+ for (i = 0; i < ncolors; i++)
+ {
+ colors[i].flags = DoRed|DoGreen|DoBlue;
+ colors[i].red = 0;
+ colors[i].green = 0;
+ colors[i].blue = 0;
+
+ switch(i) {
+ case 0: case 1: case 2: case 3: case 7: /* white */
+ colors[i].red = 0xE800;
+ colors[i].green = 0xE800;
+ colors[i].blue = 0xE800;
+ break;
+ case 4:
+ colors[i].red = 0xCFFF; break; /* red */
+ case 5:
+ colors[i].red = 0x2000;
+ colors[i].blue = 0xCFFF; break; /* blue */
+ case 6:
+ colors[i].red = 0xDFFF; /* yellow */
+ colors[i].green = 0xCFFF; break;
+ }
+ }
+
+ if (!allocate_p)
+ return;
+
+ RETRY_NON_WRITABLE:
+ if (writable_pP && *writable_pP)
+ {
+ unsigned long *pixels = (unsigned long *)
+ malloc(sizeof(*pixels) * (ncolors + 1));
+
+ allocate_writable_colors (dpy, cmap, pixels, &ncolors);
+ if (ncolors > 0)
+ for (i = 0; i < ncolors; i++)
+ colors[i].pixel = pixels[i];
+ free (pixels);
+ if (ncolors > 0)
+ XStoreColors (dpy, cmap, colors, ncolors);
+ }
+ else
+ {
+ for (i = 0; i < ncolors; i++)
+ {
+ XColor color;
+ color = colors[i];
+ if (!XAllocColor (dpy, cmap, &color))
+ break;
+ colors[i].pixel = color.pixel;
+ }
+ ncolors = i;
+ }
+
+ /* If we tried for writable cells and got none, try for non-writable. */
+ if (allocate_p && ncolors == 0 && writable_pP && *writable_pP)
+ {
+ ncolors = *ncolorsP;
+ *writable_pP = False;
+ goto RETRY_NON_WRITABLE;
+ }
+
+#if 0
+ /* I don't think we need to bother copying or linking to the complain
+ function. */
+ if (verbose_p)
+ complain(*ncolorsP, ncolors, wanted_writable,
+ wanted_writable && *writable_pP);
+#endif
+
+ *ncolorsP = ncolors;
+}
+
+static void
+mondrian_set_sizes (struct state *st, int w, int h)
+{
+ if (w > h) {
+ st->line_width = w/50;
+ st->min_height = st->min_width = w/8;
+ } else {
+ st->line_width = h/50;
+ st->min_height = st->min_width = h/8;
+ }
+}
+
static void
deco (Display *dpy, Window window, struct state *st,
int x, int y, int w, int h, int depth)
}
else
{
- if (random() & 1)
- {
- deco (dpy, window, st, x, y, w/2, h, depth+1);
- deco (dpy, window, st, x+w/2, y, w/2, h, depth+1);
+ if ((st->goldenRatio || st->mondrian) ? (w > h) : (random() & 1))
+ { /* Divide the rectangle side-by-side */
+ int wnew = (st->goldenRatio ? (w * (random() & 1 ? PHI1 : PHI2)) : w/2);
+ deco (dpy, window, st, x, y, wnew, h, depth+1);
+ deco (dpy, window, st, x+wnew, y, w-wnew, h, depth+1);
}
else
- {
- deco (dpy, window, st, x, y, w, h/2, depth+1);
- deco (dpy, window, st, x, y+h/2, w, h/2, depth+1);
+ { /* Divide the rectangle top-to-bottom */
+ int hnew = (st->goldenRatio ? (h * (random() & 1 ? PHI1 : PHI2)) : h/2);
+ deco (dpy, window, st, x, y, w, hnew, depth+1);
+ deco (dpy, window, st, x, y+hnew, w, h-hnew, depth+1);
}
}
}
st->delay = get_integer_resource (dpy, "delay", "Integer");
+ st->smoothColors = get_boolean_resource(dpy, "smoothColors", "Boolean");
+ st->old_line_width = 1;
+
+ st->goldenRatio = get_boolean_resource (dpy, "goldenRatio", "Boolean");
+
st->max_depth = get_integer_resource (dpy, "maxDepth", "Integer");
if (st->max_depth < 1) st->max_depth = 1;
else if (st->max_depth > 1000) st->max_depth = 1000;
st->min_height = get_integer_resource (dpy, "minHeight", "Integer");
if (st->min_height < 2) st->min_height = 2;
+ st->line_width = get_integer_resource (dpy, "lineWidth", "Integer");
+
XGetWindowAttributes (dpy, window, &st->xgwa);
+ st->ncolors = get_integer_resource (dpy, "ncolors", "Integer");
+
gcv.foreground = get_pixel_resource(dpy, st->xgwa.colormap,
"foreground", "Foreground");
st->fgc = XCreateGC (dpy, window, GCForeground, &gcv);
"background", "Background");
st->bgc = XCreateGC (dpy, window, GCForeground, &gcv);
- st->ncolors = get_integer_resource (dpy, "ncolors", "Integer");
-
- make_random_colormap (dpy, st->xgwa.visual, st->xgwa.colormap, st->colors, &st->ncolors,
- False, True, 0, True);
-
if (st->ncolors <= 2)
mono_p = True;
st->bgc = tmp;
}
+ st->mondrian = get_boolean_resource(dpy, "mondrian", "Boolean");
+ if (st->mondrian) {
+ /* Mondrian, if true, overrides several other options. */
+ mondrian_set_sizes(st, st->xgwa.width, st->xgwa.height);
+
+ /** set up red-yellow-blue-black-white colormap and fgc **/
+ make_mondrian_colormap(dpy, st->xgwa.visual, st->xgwa.colormap,
+ st->colors, &st->ncolors, True, 0, True);
+
+ /** put white in several cells **/
+ /** set min-height and min-width to about 10% of total w/h **/
+ }
+ else if (st->smoothColors)
+ make_smooth_colormap (dpy, st->xgwa.visual, st->xgwa.colormap,
+ st->colors, &st->ncolors, True, 0, True);
+ else
+ make_random_colormap (dpy, st->xgwa.visual, st->xgwa.colormap,
+ st->colors, &st->ncolors, False, True, 0, True);
+
+ gcv.line_width = st->old_line_width = st->line_width;
+ XChangeGC(dpy, st->fgc, GCLineWidth, &gcv);
+
return st;
}
{
struct state *st = (struct state *) closure;
XFillRectangle (dpy, window, st->bgc, 0, 0, st->xgwa.width, st->xgwa.height);
+ if (st->mondrian) {
+ mondrian_set_sizes(st, st->xgwa.width, st->xgwa.height);
+ if (st->line_width != st->old_line_width) {
+ XSetLineAttributes(dpy, st->fgc, st->line_width,
+ LineSolid, CapButt, JoinBevel);
+ st->old_line_width = st->line_width;
+ }
+ }
deco (dpy, window, st, 0, 0, st->xgwa.width, st->xgwa.height, 0);
return 1000000 * st->delay;
}
"*maxDepth: 12",
"*minWidth: 20",
"*minHeight: 20",
+ "*lineWidth: 1",
"*delay: 5",
"*ncolors: 64",
+ "*goldenRatio: False",
+ "*smoothColors: False",
+ "*mondrian: False",
0
};
{ "-max-depth", ".maxDepth", XrmoptionSepArg, 0 },
{ "-min-width", ".minWidth", XrmoptionSepArg, 0 },
{ "-min-height", ".minHeight", XrmoptionSepArg, 0 },
+ { "-line-width", ".lineWidth", XrmoptionSepArg, 0 },
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-ncolors", ".ncolors", XrmoptionSepArg, 0 },
+ { "-golden-ratio", ".goldenRatio", XrmoptionNoArg, "True" },
+ { "-no-golden-ratio", ".goldenRatio", XrmoptionNoArg, "False" },
+ { "-smooth-colors", ".smoothColors",XrmoptionNoArg, "True" },
+ { "-no-smooth-colors",".smoothColors",XrmoptionNoArg, "False" },
+ { "-mondrian", ".mondrian", XrmoptionNoArg, "True" },
+ { "-no-mondrian", ".mondrian", XrmoptionNoArg, "False" },
{ 0, 0, 0, 0 }
};
projects / xscreensaver / blobdiff