From http://www.jwz.org/xscreensaver/xscreensaver-5.31.tar.gz

[xscreensaver] / hacks / glx / crackberg.c

diff --git a/hacks/glx/crackberg.c b/hacks/glx/crackberg.c
index 64e53028c6d04ca70bc211afb486fa897d5ddbe0..85c6294090da6a632c0748da872cba5d48084a65 100644 (file)
--- a/hacks/glx/crackberg.c
+++ b/hacks/glx/crackberg.c
@@ -1335,6 +1335,19 @@ ENTRYPOINT Bool crackberg_handle_event (ModeInfo *mi, XEvent *ev)
       if (dy > 0 && dy > dx) dx = 0;
       if (dy < 0 && dy < dx) dx = 0;
 
+      {
+        int rot = current_device_rotation();
+        int swap;
+        while (rot <= -180) rot += 360;
+        while (rot >   180) rot -= 360;
+        if (rot > 135 || rot < -135)           /* 180 */
+            dx = -dx, dy = -dy;
+        else if (rot > 45)                     /* 90 */
+          swap = dx, dx = -dy, dy = swap;
+        else if (rot < -45)                    /* 270 */
+          swap = dx, dx = dy, dy = -swap;
+      }
+
       if      (dx > 0) cberg->motion_state |= MOTION_LEFT;
       else if (dx < 0) cberg->motion_state |= MOTION_RIGHT;
       else if (dy > 0) cberg->motion_state |= MOTION_FORW;