From http://www.jwz.org/xscreensaver/xscreensaver-5.22.tar.gz

[xscreensaver] / hacks / discrete.c

diff --git a/hacks/discrete.c b/hacks/discrete.c
index 66c0a3ed89463eac409c30a9431dc458b8a239b7..a78690d033388921cb3c6ebfc34176bd001ba293 100644 (file)
--- a/hacks/discrete.c
+++ b/hacks/discrete.c
@@ -6,7 +6,7 @@ static const char sccsid[] = "@(#)discrete.c    5.00 2000/11/01 xlockmore";
 #endif
 
 /*-
- * Copyright (c) 1996 by Tim Auckland <Tim.Auckland@Procket.com>
+ * Copyright (c) 1996 by Tim Auckland <tda10.geo@yahoo.com>
  *
  * Permission to use, copy, modify, and distribute this software and its
  * documentation for any purpose and without fee is hereby granted,
@@ -32,25 +32,25 @@ static const char sccsid[] = "@(#)discrete.c        5.00 2000/11/01 xlockmore";
  */
 
 #ifdef STANDALONE
-#define MODE_discrete
-#define PROGCLASS "Discrete"
-#define HACK_INIT init_discrete
-#define HACK_DRAW draw_discrete
-#define discrete_opts xlockmore_opts
-#define DEFAULTS "*delay: 1000 \n" \
- "*count: 4096 \n" \
- "*cycles: 2500 \n" \
- "*ncolors: 100 \n"
-#define SMOOTH_COLORS
-#include "xlockmore.h"         /* in xscreensaver distribution */
-#include "erase.h"
+# define MODE_discrete
+#define DEFAULTS       "*delay: 20000 \n" \
+                                       "*count:  4096 \n" \
+                                       "*cycles: 2500 \n" \
+                                       "*ncolors: 100 \n" \
+                                       "*fpsSolid: true \n" \
+                                   "*ignoreRotation: True \n" \
+
+# define SMOOTH_COLORS
+# define discrete_handle_event 0
+# include "xlockmore.h"                /* in xscreensaver distribution */
+# include "erase.h"
 #else /* STANDALONE */
-#include "xlock.h"             /* in xlockmore distribution */
+# include "xlock.h"            /* in xlockmore distribution */
 #endif /* STANDALONE */
 
 #ifdef MODE_discrete
 
-ModeSpecOpt discrete_opts =
+ENTRYPOINT ModeSpecOpt discrete_opts =
 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
 
 #ifdef USE_MODULES
@@ -99,12 +99,19 @@ typedef struct {
        enum ftypes op;
        int         count;
        XPoint     *pointBuffer;        /* pointer for XDrawPoints */
+
+    int sqrt_sign, std_sign;
+
+#ifdef STANDALONE
+  eraser_state *eraser;
+#endif
+
 } discretestruct;
 
 static discretestruct *discretes = (discretestruct *) NULL;
 
-void
-init_discrete(ModeInfo * mi)
+ENTRYPOINT void
+init_discrete (ModeInfo * mi)
 {
        double      range;
        discretestruct *hp;
@@ -243,16 +250,20 @@ init_discrete(ModeInfo * mi)
                /* if fails will check later */
        }
 
+#ifndef STANDALONE
        /* Clear the background. */
        MI_CLEARWINDOW(mi);
+#endif
 
        XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_WHITE_PIXEL(mi));
        hp->count = 0;
+    hp->sqrt_sign = 1;
+    hp->std_sign = 1;
 }
 
 
-void
-draw_discrete(ModeInfo * mi)
+static void
+draw_discrete_1 (ModeInfo * mi)
 {
        Display    *dsp = MI_DISPLAY(mi);
        Window      win = MI_WINDOW(mi);
@@ -338,11 +349,9 @@ draw_discrete(ModeInfo * mi)
                                        ? sqrt(fabs(hp->b * (hp->i - hp->c)))
                                                         : -sqrt(fabs(hp->b * (hp->i - hp->c))));
                                } else {
-                                       static int  s = 1;
-
-                                       hp->i = s * hp->inc * hp->maxx / cycles / 2;
+                                       hp->i = (hp->sqrt_sign ? 1 : -1) * hp->inc * hp->maxx / cycles / 2;
                                        hp->j = hp->a + hp->i;
-                                       s = -s;
+                                       hp->sqrt_sign = !hp->sqrt_sign;
                                }
                                break;
                        case STANDARD:
@@ -352,11 +361,9 @@ draw_discrete(ModeInfo * mi)
                                        hp->i = oldi + hp->j;
                                        hp->i = fmod(hp->i + 2 * M_PI, 2 * M_PI);
                                } else {
-                                       static int  s = 1;
-
-                                       hp->j = M_PI + fmod(s * hp->inc * 2 * M_PI / (cycles - 0.5), M_PI);
+                                       hp->j = M_PI + fmod((hp->std_sign ? 1 : -1) * hp->inc * 2 * M_PI / (cycles - 0.5), M_PI);
                                        hp->i = M_PI;
-                                       s = -s;
+                                       hp->std_sign = !hp->std_sign;
                                }
                                break;
                        case BIRDIE:
@@ -390,15 +397,42 @@ draw_discrete(ModeInfo * mi)
                xp++;
        }
        XDrawPoints(dsp, win, gc, hp->pointBuffer, count, CoordModeOrigin);
-       if (++hp->count > cycles) {
-#ifdef STANDALONE
-               erase_full_window(MI_DISPLAY(mi), MI_WINDOW(mi));
-#endif /* STANDALONE */
-               init_discrete(mi);
-       }
 }
 
-void
+ENTRYPOINT void
+draw_discrete (ModeInfo * mi)
+{
+  discretestruct *hp = &discretes[MI_SCREEN(mi)];
+  int cycles = MI_CYCLES(mi);
+  int i;
+
+  if (hp->eraser) {
+    hp->eraser = erase_window (MI_DISPLAY(mi), MI_WINDOW(mi), hp->eraser);
+    return;
+  }
+
+  for (i = 0; i < 10; i++) {
+    draw_discrete_1 (mi);
+    hp->count++;
+  }
+
+  if (hp->count > cycles) {
+    hp->eraser = erase_window (MI_DISPLAY(mi), MI_WINDOW(mi), hp->eraser);
+    init_discrete(mi);
+  }
+}
+
+
+ENTRYPOINT void
+reshape_discrete(ModeInfo * mi, int width, int height)
+{
+  discretestruct *hp = &discretes[MI_SCREEN(mi)];
+  hp->maxx = width;
+  hp->maxy = height;
+  XClearWindow (MI_DISPLAY (mi), MI_WINDOW(mi));
+}
+
+ENTRYPOINT void
 release_discrete(ModeInfo * mi)
 {
        if (discretes != NULL) {
@@ -417,10 +451,12 @@ release_discrete(ModeInfo * mi)
        }
 }
 
-void
+ENTRYPOINT void
 refresh_discrete(ModeInfo * mi)
 {
        MI_CLEARWINDOW(mi);
 }
 
+XSCREENSAVER_MODULE ("Discrete", discrete)
+
 #endif /* MODE_discrete */