Do things in a way more amenable to subclassing.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3684 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/jme/sprite/LineSegmentPath.java

@@ -61,10 +61,7 @@ public class LineSegmentPath extends Path
         // segment time and move on to the next segment
         if (_accum > _durations[_current]) {
             _accum -= _durations[_current];
-            _current++;
-            if (_current < _points.length-1) {
-                updateRotation();
-            }
+            advance();
         }
 
         // if we have completed our path, move the sprite to the final
@@ -81,6 +78,14 @@ public class LineSegmentPath extends Path
         _sprite.setLocalTranslation(_temp);
     }
 
+    protected void advance ()
+    {
+        _current++;
+        if (_current < _points.length-1) {
+            updateRotation();
+        }
+    }
+
     protected void updateRotation ()
     {
         _points[_current+1].subtract(_points[_current], _temp);