From http://www.jwz.org/xscreensaver/xscreensaver-5.30.tar.gz

[xscreensaver] / hacks / galaxy.c

diff --git a/hacks/galaxy.c b/hacks/galaxy.c
index 06aa1c4d4da252d6dac8173dea7d2ebbd8ef8ffd..2aeeb6f30f0cc11640d7088d1eb6acb1f83c9af1 100644 (file)
--- a/hacks/galaxy.c
+++ b/hacks/galaxy.c
@@ -43,10 +43,11 @@ static const char sccsid[] = "@(#)galaxy.c 4.04 97/07/28 xlockmore";
 # define DEFAULTS      "*delay:  20000  \n"   \
                                        "*count:  -5     \n"   \
                                        "*cycles:  250   \n"   \
-                                       "*ncolors:  64   \n"
+                                       "*ncolors:  64   \n" \
+                                       "*fpsSolid:  true   \n" \
+                                       "*ignoreRotation: True \n" \
+
 # define UNIFORM_COLORS
-# define reshape_galaxy 0
-# define galaxy_handle_event 0
 # include "xlockmore.h"    /* from the xscreensaver distribution */
 #else  /* !STANDALONE */
 # include "xlock.h"     /* from the xlockmore distribution */
@@ -368,9 +369,9 @@ draw_galaxy(ModeInfo * mi)
 
         d = d0 * d0 + d1 * d1 + d2 * d2;
         if (d > EPSILON)
-          d = gt->mass / (d * sqrt(d)) * DELTAT * DELTAT * QCONS;
+          d = gtk->mass / (d * sqrt(d)) * DELTAT * DELTAT * QCONS;
         else
-          d = gt->mass * eps;
+          d = gtk->mass / (eps * sqrt(eps));
         v0 += d0 * d;
         v1 += d1 * d;
         v2 += d2 * d;
@@ -400,19 +401,19 @@ draw_galaxy(ModeInfo * mi)
 
       d = d0 * d0 + d1 * d1 + d2 * d2;
       if (d > EPSILON)
-        d = gt->mass * gt->mass / (d * sqrt(d)) * DELTAT * QCONS;
+        d = 1 / (d * sqrt(d)) * DELTAT * QCONS;
       else
-        d = gt->mass * gt->mass / (EPSILON * sqrt_EPSILON) * DELTAT * QCONS;
+        d = 1 / (EPSILON * sqrt_EPSILON) * DELTAT * QCONS;
 
       d0 *= d;
       d1 *= d;
       d2 *= d;
-      gt->vel[0] += d0 / gt->mass;
-      gt->vel[1] += d1 / gt->mass;
-      gt->vel[2] += d2 / gt->mass;
-      gtk->vel[0] -= d0 / gtk->mass;
-      gtk->vel[1] -= d1 / gtk->mass;
-      gtk->vel[2] -= d2 / gtk->mass;
+      gt->vel[0] += d0 * gtk->mass;
+      gt->vel[1] += d1 * gtk->mass;
+      gt->vel[2] += d2 * gtk->mass;
+      gtk->vel[0] -= d0 * gt->mass;
+      gtk->vel[1] -= d1 * gt->mass;
+      gtk->vel[2] -= d2 * gt->mass;
     }
 
     gt->pos[0] += gt->vel[0] * DELTAT;
@@ -438,6 +439,13 @@ draw_galaxy(ModeInfo * mi)
     startover(mi);
 }
 
+ENTRYPOINT void
+reshape_galaxy(ModeInfo * mi, int width, int height)
+{
+  XClearWindow (MI_DISPLAY (mi), MI_WINDOW(mi));
+  init_galaxy (mi);
+}
+
 ENTRYPOINT void
 release_galaxy(ModeInfo * mi)
 {
@@ -457,4 +465,16 @@ refresh_galaxy(ModeInfo * mi)
  /* Do nothing, it will refresh by itself */
 }
 
+ENTRYPOINT Bool
+galaxy_handle_event (ModeInfo *mi, XEvent *event)
+{
+  if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
+    {
+      reshape_galaxy (mi, MI_WIDTH(mi), MI_HEIGHT(mi));
+      return True;
+    }
+  return False;
+}
+
+
 XSCREENSAVER_MODULE ("Galaxy", galaxy)