/* xscreensaver, Copyright (c) 1992, 1995, 1996, 1997
- * Jamie Zawinski <jwz@netscape.com>
+ * 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
* 1992: jwz created.
*/
+/* 25 April 2002: Matthew Strait <straitm@mathcs.carleton.edu> added
+-subdelay option so the drawing process can be watched */
+
#include <math.h>
#include "screenhack.h"
#include "erase.h"
static GC draw_gc;
static unsigned int default_fg_pixel;
static int sleep_time;
+static int subdelay;
static void
init_helix (Display *dpy, Window window)
XDrawLine (dpy, window, draw_gc, x1, y1, x2, y2);
x2 = xmid + (((double) radius2) * sins [pmod ((angle * factor3), 360)]);
y2 = ymid + (((double) radius1) * coss [pmod ((angle * factor4), 360)]);
-
XDrawLine (dpy, window, draw_gc, x1, y1, x2, y2);
angle += d_angle;
+
+ /* if we sleep every time, it's too slow */
+ if(subdelay && i%16 == 0) usleep(subdelay);
+
XFlush (dpy);
}
}
if (tmp == 0) /* Do not want it getting stuck... */
tmp = 1; /* Would not need if floating point */
d_angle += dir * tmp;
+
+ /* this draws faster, so we sleep somewhat more often */
+ if(subdelay && d_angle%4 == 0) usleep(subdelay);
+
+ /* without this, the subdelay effect is lost */
+ XFlush (dpy);
}
}
else
random_trig(dpy, window, &color, &free_color);
- XSync (dpy, True);
+ XSync (dpy, False);
+ screenhack_handle_events (dpy);
sleep ( sleep_time );
+ screenhack_handle_events (dpy);
erase_full_window(dpy, window);
if (free_color) XFreeColors (dpy, cmap, &color.pixel, 1, 0);
- XSync (dpy, True);
+ XSync (dpy, False);
+ screenhack_handle_events (dpy);
sleep (1);
}
char *progclass = "Helix";
char *defaults [] = {
- "Helix.background: black", /* to placate SGI */
+ ".background: black",
"*delay: 5",
+ "*subdelay: 0",
0
};
XrmOptionDescRec options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
- { 0 },
+ { "-subdelay", ".subdelay", XrmoptionSepArg, 0 },
+ { 0, 0, 0, 0 },
};
int options_size = (sizeof (options) / sizeof (options[0]));
screenhack (Display *dpy, Window window)
{
sleep_time = get_integer_resource("delay", "Integer");
+ subdelay = get_integer_resource("subdelay", "Integer");
init_helix (dpy, window);
while (1)
random_helix_or_trig (dpy, window);