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diff --git a/original/rotator.h b/original/rotator.h
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+/* xscreensaver, Copyright (c) 1998-2002 Jamie Zawinski <jwz@jwz.org>
+ *
+ * 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.
+ */
+
+#ifndef __ROTATOR_H__
+#define __ROTATOR_H__
+
+typedef struct rotator rotator;
+
+/* Returns a rotator object, which encapsulates rotation and motion state.
+
+   spin_[xyz]_speed indicates the relative speed of rotation.
+   Specify 0 if you don't want any rotation around that axis.
+
+   spin_accel specifies a scaling factor for the acceleration that is
+   randomly applied to spin: if you want the speed to change faster,
+   make this > 1.
+
+   wander_speed indicates the relative speed through space.
+
+   If randomize_initial_state_p is true, then the initial position and
+   rotation will be randomized (even if the spin speeds are 0.)  If it
+   is false, then all values will be initially zeroed.
+ */
+extern rotator *make_rotator (double spin_x_speed,
+                              double spin_y_speed,
+                              double spin_z_speed,
+                              double spin_accel,
+                              double wander_speed,
+                              int randomize_initial_state_p);
+
+/* Rotates one step, and returns the new rotation values.
+   x, y, and z range from 0.0-1.0, the fraction through the circle
+   (*not* radians or degrees!)
+   If `update_p' is non-zero, then (maybe) rotate first.
+ */
+extern void get_rotation (rotator *rot,
+                          double *x_ret, double *y_ret, double *z_ret,
+                          int update_p);
+
+/* Moves one step, and returns the new position values.
+   x, y, and z range from 0.0-1.0, the fraction through space:
+   scale those values as needed.
+   If `update_p' is non-zero, then (maybe) move first.
+ */
+extern void get_position (rotator *rot,
+                          double *x_ret, double *y_ret, double *z_ret,
+                          int update_p);
+
+/* Destroys and frees a `rotator' object. */
+extern void free_rotator (rotator *r);
+
+#endif /* __ROTATOR_H__ */