-/* xscreensaver, Copyright (c) 1992 Jamie Zawinski <jwz@lucid.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.
+/* -*- Mode: C; tab-width: 4 -*-
+ * hop --- real plane fractals.
*/
+#if !defined( lint ) && !defined( SABER )
+static const char sccsid[] = "@(#)hop.c 4.02 97/04/01 xlockmore";
+#endif
-/* 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.
+/* Copyright (c) 1988-91 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,
* 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
+ * Revision History:
+ * Changes of David Bagley <bagleyd@bigfoot.com>
+ * 10-May-97: jwz@netscape.com: ported from xlockmore 4.03a10 to be a
+ * standalone program and thus usable with xscreensaver
+ * (I threw away my 1992 port and started over.)
+ * 27-Jul-95: added Peter de Jong's hop from Scientific American
+ * July 87 p. 111. Sometimes they are amazing but there are a
+ * few duds (I did not see a pattern in the parameters).
+ * 29-Mar-95: changed name from hopalong to hop
+ * 09-Dec-94: added sine hop
*
- * Patrick J. Naughton
- * MS 21-14
- * Sun Laboritories, Inc.
- * 2550 Garcia Ave
- * Mountain View, CA 94043
+ * (12-Aug-92: jwz@lucid.com: made xlock version run standalone.)
*
- * Revision History:
+ * Changes of Patrick J. Naughton
* 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();
+ * Fixed bug in memory allocation in init_hop();
* Moved seconds() to an extern.
* Got rid of the % mod since .mod is slow on a sparc.
* 20-Sep-89: Lint.
* 23-Mar-88: Coded HOPALONG routines from Scientific American Sept. 86 p. 14.
*/
-#include "screenhack.h"
-#include <math.h>
+#ifdef STANDALONE
+# define PROGCLASS "Hopalong"
+# define HACK_INIT init_hop
+# define HACK_DRAW draw_hop
+# define HACK_FREE release_hop
+# define hop_opts xlockmore_opts
+# define DEFAULTS "*count: 1000 \n" \
+ "*cycles: 2500 \n" \
+ "*delay: 10000 \n" \
+ "*ncolors: 200 \n" \
+ "*eraseSpeed: 400 \n" \
+ "*eraseMode: -1 \n"
+# define SMOOTH_COLORS
+# include "xlockmore.h" /* from the xscreensaver distribution */
+# include "erase.h"
+#else /* !STANDALONE */
+# include "xlock.h" /* from the xlockmore distribution */
+#endif /* !STANDALONE */
+
+static Bool jong;
+static Bool sine;
+
+#define DEF_JONG "False"
+#define DEF_SINE "False"
+
+static XrmOptionDescRec opts[] =
+{
+ {"-jong", ".hop.jong", XrmoptionNoArg, (caddr_t) "on"},
+ {"+jong", ".hop.jong", XrmoptionNoArg, (caddr_t) "off"},
+ {"-sine", ".hop.sine", XrmoptionNoArg, (caddr_t) "on"},
+ {"+sine", ".hop.sine", XrmoptionNoArg, (caddr_t) "off"}
+};
+static argtype vars[] =
+{
+ {(caddr_t *) & jong, "jong", "Jong", DEF_JONG, t_Bool},
+ {(caddr_t *) & sine, "sine", "Sine", DEF_SINE, t_Bool}
+};
+static OptionStruct desc[] =
+{
+ {"-/+jong", "turn on/off jong format"},
+ {"-/+sine", "turn on/off sine format"}
+};
+
+ModeSpecOpt hop_opts = { 4, opts, 2, vars, desc };
-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;
+#define SQRT 0
+#define JONG 1
+#define SINE 2
+#ifdef OFFENDING
+#define OPS 2 /* Sine might be too close to a Swastika for some... */
+#else
+#define OPS 3
+#endif
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;
+ int centerx;
+ int centery; /* center of the screen */
+ double a;
+ double b;
+ double c;
+ double d;
+ double i;
+ double j; /* hopalong parameters */
+ int inc;
+ int pix;
+ int op;
+ int count;
+ int bufsize;
+} hopstruct;
+
+static hopstruct *hops = NULL;
static XPoint *pointBuffer = 0; /* pointer for XDrawPoints */
-static void
-inithop(dsp,win)
- Display *dsp;
- Window win;
+void
+init_hop(ModeInfo * mi)
{
- 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);
+ Display *display = MI_DISPLAY(mi);
+ GC gc = MI_GC(mi);
+ hopstruct *hp;
+ double range;
+
+ if (hops == NULL) {
+ if ((hops = (hopstruct *) calloc(MI_NUM_SCREENS(mi),
+ sizeof (hopstruct))) == NULL)
+ return;
+ }
+ hp = &hops[MI_SCREEN(mi)];
+
+ hp->centerx = MI_WIN_WIDTH(mi) / 2;
+ hp->centery = MI_WIN_HEIGHT(mi) / 2;
+ /* Make the other operations less common since they are less interesting */
+ if (MI_WIN_IS_FULLRANDOM(mi)) {
+ hp->op = NRAND(OPS+2); /* jwz: make the others a bit more likely. */
+ if (hp->op >= OPS)
+ hp->op = SQRT;
+ } else {
+ hp->op = SQRT;
+ if (jong)
+ hp->op = JONG;
+ else if (sine)
+ hp->op = SINE;
+ }
+ switch (hp->op) {
+ case SQRT:
+ range = sqrt((double) hp->centerx * hp->centerx +
+ (double) hp->centery * hp->centery) / (10.0 + NRAND(10));
+
+ hp->a = (LRAND() / MAXRAND) * range - range / 2.0;
+ hp->b = (LRAND() / MAXRAND) * range - range / 2.0;
+ hp->c = (LRAND() / MAXRAND) * range - range / 2.0;
+ if (LRAND() & 1)
+ hp->c = 0.0;
+ break;
+ case JONG:
+ hp->a = (LRAND() / MAXRAND) * 2.0 * M_PI - M_PI;
+ hp->b = (LRAND() / MAXRAND) * 2.0 * M_PI - M_PI;
+ hp->c = (LRAND() / MAXRAND) * 2.0 * M_PI - M_PI;
+ hp->d = (LRAND() / MAXRAND) * 2.0 * M_PI - M_PI;
+ break;
+ case SINE:
+ hp->a = M_PI + ((LRAND() / MAXRAND) * 2.0 - 1.0) * 0.7;
+ break;
+ }
+ if (MI_NPIXELS(mi) > 2)
+ hp->pix = NRAND(MI_NPIXELS(mi));
+ hp->i = hp->j = 0.0;
+ hp->inc = (int) ((LRAND() / MAXRAND) * 200) - 100;
+ hp->bufsize = MI_BATCHCOUNT(mi);
+
+ if (!pointBuffer)
+ pointBuffer = (XPoint *) malloc(hp->bufsize * sizeof (XPoint));
+
+ XClearWindow(display, MI_WINDOW(mi));
+
+ XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
+ hp->count = 0;
}
-static void
-drawhop(dsp,win)
- Display *dsp;
- Window win;
+void
+draw_hop(ModeInfo * mi)
{
- 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);
- }
-}
+ hopstruct *hp = &hops[MI_SCREEN(mi)];
+ double oldj, oldi;
+ XPoint *xp = pointBuffer;
+ int k = hp->bufsize;
-\f
-char *progclass = "Hopalong";
-
-char *defaults [] = {
- "*background: black",
- "*foreground: white",
- "*count: 1000",
- "*ncolors: 100",
- "*timeout: 20",
- "*delay: 0",
- 0
-};
+ hp->inc++;
+ if (MI_NPIXELS(mi) > 2) {
+ XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_PIXEL(mi, hp->pix));
+ if (++hp->pix >= MI_NPIXELS(mi))
+ hp->pix = 0;
+ }
+ while (k--) {
+ oldj = hp->j;
+ switch (hp->op) {
+ case SQRT:
+ oldi = hp->i + hp->inc;
+ hp->j = hp->a - hp->i;
+ hp->i = oldj + ((hp->i < 0)
+ ? sqrt(fabs(hp->b * oldi - hp->c))
+ : -sqrt(fabs(hp->b * oldi - hp->c)));
+ xp->x = hp->centerx + (int) (hp->i + hp->j);
+ xp->y = hp->centery - (int) (hp->i - hp->j);
+ break;
+ case JONG:
+ if (hp->centerx > 0)
+ oldi = hp->i + 4 * hp->inc / hp->centerx;
+ else
+ oldi = hp->i;
+ hp->j = sin(hp->c * hp->i) - cos(hp->d * hp->j);
+ hp->i = sin(hp->a * oldj) - cos(hp->b * oldi);
+ xp->x = hp->centerx + (int) (hp->centerx * (hp->i + hp->j) / 4.0);
+ xp->y = hp->centery - (int) (hp->centery * (hp->i - hp->j) / 4.0);
+ break;
+ case SINE:
+ oldi = hp->i + hp->inc;
+ hp->j = hp->a - hp->i;
+ hp->i = oldj - sin(oldi);
+ xp->x = hp->centerx + (int) (hp->i + hp->j);
+ xp->y = hp->centery - (int) (hp->i - hp->j);
+ break;
+ }
+ xp++;
+ }
+ XDrawPoints(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ pointBuffer, hp->bufsize, CoordModeOrigin);
+ if (++hp->count > MI_CYCLES(mi)) {
+#ifdef STANDALONE
+ erase_full_window(MI_DISPLAY(mi), MI_WINDOW(mi));
+#endif /* STANDALONE */
+ init_hop(mi);
+ }
+}
-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
+release_hop(ModeInfo * mi)
+{
+ if (hops != NULL) {
+ (void) free((void *) hops);
+ hops = NULL;
+ }
+ if (pointBuffer) {
+ (void) free((void *) pointBuffer);
+ pointBuffer = NULL;
+ }
+}
void
-screenhack (dpy, window)
- Display *dpy;
- Window window;
+refresh_hop(ModeInfo * mi)
{
- inithop (dpy, window);
- while (1)
- {
- drawhop (dpy, window);
- XSync (dpy, True);
- if (delay) usleep (delay);
- }
+ XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
}
projects / xscreensaver / blobdiff