+++ /dev/null
-/* xscreensaver, Copyright (c) 1992, 1995 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.
- */
-
-/* This file was ported from xlock for use in xscreensaver (and standalone)
- * by jwz on 12-Aug-92. Original copyright reads:
- *
- * hopalong.c - Real Plane Fractals for xlock, the X Window System lockscreen.
- *
- * Copyright (c) 1991 by Patrick J. Naughton.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted,
- * provided that the above copyright notice appear in all copies and that
- * both that copyright notice and this permission notice appear in
- * supporting documentation.
- *
- * This file is provided AS IS with no warranties of any kind. The author
- * shall have no liability with respect to the infringement of copyrights,
- * trade secrets or any patents by this file or any part thereof. In no
- * event will the author be liable for any lost revenue or profits or
- * other special, indirect and consequential damages.
- *
- * Comments and additions should be sent to the author:
- *
- * naughton@eng.sun.com
- *
- * Patrick J. Naughton
- * MS 21-14
- * Sun Laboritories, Inc.
- * 2550 Garcia Ave
- * Mountain View, CA 94043
- *
- * Revision History:
- * 29-Oct-90: fix bad (int) cast.
- * 29-Jul-90: support for multiple screens.
- * 08-Jul-90: new timing and colors and new algorithm for fractals.
- * 15-Dec-89: Fix for proper skipping of {White,Black}Pixel() in colors.
- * 08-Oct-89: Fixed long standing typo bug in RandomInitHop();
- * Fixed bug in memory allocation in inithop();
- * Moved seconds() to an extern.
- * Got rid of the % mod since .mod is slow on a sparc.
- * 20-Sep-89: Lint.
- * 31-Aug-88: Forked from xlock.c for modularity.
- * 23-Mar-88: Coded HOPALONG routines from Scientific American Sept. 86 p. 14.
- */
-
-#include <math.h>
-#include "screenhack.h"
-
-static GC gc;
-static int batchcount = 1000;
-
-static unsigned int *pixels = 0, fg_pixel, bg_pixel;
-static int npixels;
-static unsigned int delay;
-static int timeout;
-
-typedef struct {
- int centerx;
- int centery; /* center of the screen */
- double a;
- double b;
- double c;
- double i;
- double j; /* hopalong parameters */
- int inc;
- int pix;
- long startTime;
-} hopstruct;
-
-static hopstruct hop;
-static XPoint *pointBuffer = 0; /* pointer for XDrawPoints */
-
-static void
-inithop(dsp,win)
- Display *dsp;
- Window win;
-{
- double range;
- XWindowAttributes xgwa;
- hopstruct *hp = &hop;
- XGCValues gcv;
- Colormap cmap;
- XGetWindowAttributes (dsp, win, &xgwa);
- cmap = xgwa.colormap;
-
- if (! pixels)
- {
- XColor color;
- int i = get_integer_resource ("ncolors", "Integer");
- int shift;
- if (i <= 2) i = 2, mono_p = True;
- shift = 360 / i;
- pixels = (unsigned int *) calloc (i, sizeof (unsigned int));
- fg_pixel = get_pixel_resource ("foreground", "Foreground", dsp, cmap);
- bg_pixel = get_pixel_resource ("background", "Background", dsp, cmap);
- if (! mono_p)
- {
- hsv_to_rgb (random () % 360, 1.0, 1.0,
- &color.red, &color.green, &color.blue);
- for (npixels = 0; npixels < i; npixels++)
- {
- if (! XAllocColor (dsp, cmap, &color))
- break;
- pixels[npixels] = color.pixel;
- cycle_hue (&color, shift);
- }
- }
- timeout = get_integer_resource ("timeout", "Seconds");
- if (timeout <= 0) timeout = 30;
- delay = get_integer_resource ("delay", "Usecs");
-
- gcv.foreground = fg_pixel;
- gc = XCreateGC (dsp, win, GCForeground, &gcv);
- }
-
- XClearWindow (dsp, win);
-
- hp->centerx = xgwa.width / 2;
- hp->centery = xgwa.height / 2;
- range = sqrt((double) hp->centerx * hp->centerx +
- (double) hp->centery * hp->centery) /
- (10.0 + random() % 10);
-
- hp->pix = 0;
-#define frand0() (((double) random()) / ((unsigned int) (~0)))
- hp->inc = (int) (frand0() * 200) - 100;
- hp->a = frand0() * range - range / 2.0;
- hp->b = frand0() * range - range / 2.0;
- hp->c = frand0() * range - range / 2.0;
- if (!(random() % 2))
- hp->c = 0.0;
-
- hp->i = hp->j = 0.0;
-
- if (!pointBuffer)
- pointBuffer = (XPoint *) malloc(batchcount * sizeof(XPoint));
-
- XSetForeground(dsp, gc, bg_pixel);
- XFillRectangle(dsp, win, gc, 0, 0,
- hp->centerx * 2, hp->centery * 2);
- XSetForeground(dsp, gc, fg_pixel);
- hp->startTime = time ((time_t *) 0);
-}
-
-
-static void
-drawhop(dsp,win)
- Display *dsp;
- Window win;
-{
- double oldj;
- int k = batchcount;
- XPoint *xp = pointBuffer;
- hopstruct *hp = &hop;
-
- hp->inc++;
- if (! mono_p) {
- XSetForeground(dsp, gc, pixels[hp->pix]);
- if (++hp->pix >= npixels)
- hp->pix = 0;
- }
- while (k--) {
- oldj = hp->j;
- hp->j = hp->a - hp->i;
- hp->i = oldj + (hp->i < 0
- ? sqrt(fabs(hp->b * (hp->i + hp->inc) - hp->c))
- : -sqrt(fabs(hp->b * (hp->i + hp->inc) - hp->c)));
- xp->x = hp->centerx + (int) (hp->i + hp->j);
- xp->y = hp->centery - (int) (hp->i - hp->j);
- xp++;
- }
- XDrawPoints(dsp, win, gc,
- pointBuffer, batchcount, CoordModeOrigin);
- XSync (dsp, True);
- if ((time ((time_t *) 0) - hp->startTime) > timeout)
- {
- int i;
- XSetForeground(dsp, gc, bg_pixel);
- for (i = 0; i < hp->centery; i++)
- {
- int y = (random () % (hp->centery << 1));
- XDrawLine (dsp, win, gc, 0, y, hp->centerx << 1, y);
- XFlush (dsp);
- if ((i % 50) == 0)
- usleep (10000);
- }
- XClearWindow (dsp, win);
- XFlush (dsp);
- sleep (1);
- inithop(dsp,win);
- }
-}
-
-\f
-char *progclass = "Hopalong";
-
-char *defaults [] = {
- "Hopalong.background: black", /* to placate SGI */
- "Hopalong.foreground: white",
- "*count: 1000",
- "*ncolors: 100",
- "*timeout: 20",
- "*delay: 0",
- 0
-};
-
-XrmOptionDescRec options [] = {
- { "-count", ".count", XrmoptionSepArg, 0 },
- { "-ncolors", ".ncolors", XrmoptionSepArg, 0 },
- { "-timeout", ".timeout", XrmoptionSepArg, 0 },
- { "-delay", ".delay", XrmoptionSepArg, 0 },
-};
-int options_size = (sizeof (options) / sizeof (options[0]));
-
-void
-screenhack (dpy, window)
- Display *dpy;
- Window window;
-{
- inithop (dpy, window);
- while (1)
- {
- drawhop (dpy, window);
- XSync (dpy, True);
- if (delay) usleep (delay);
- }
-}
projects / xscreensaver / blobdiff