+ if(track)
+ block = track.block_iter();
+ else
+ block = BlockIter();
+}
+
+unsigned Signal::get_n_snap_nodes() const
+{
+ return 1;
+}
+
+Snap Signal::get_snap_node(unsigned i) const
+{
+ if(i>=1)
+ throw out_of_range("Signal::get_snap_node");
+
+ Snap sn;
+ sn.position = position;
+ sn.rotation = rotation;
+ return sn;
+}
+
+SnapType Signal::get_default_snap_type_to(const Object &other) const
+{
+ if(dynamic_cast<const Track *>(&other))
+ return SNAP_SEGMENT;
+
+ return NO_SNAP;