trf++/include/gtrfit

diff -N BiGTrackFitter.hpp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ BiGTrackFitter.hpp	15 Aug 2011 17:09:06 -0000	1.1
@@ -0,0 +1,38 @@

+// BiGTrackFitter.hpp
+
+#ifndef BiGTrackFitter_H
+#define BiGTrackFitter_H
+
+// Uses SimpleGTrackRefitter to fit a track both backwards and forwards
+// resulting in an optimal fit at either end.  Intermediate fits are taken
+// from the forward fit.
+
+#include "SimpleGTrackFitter.hpp"
+
+class BiGTrackFitter : public GTrackFitter {
+
+private:  // data
+
+  SimpleGTrackFitter _infit;
+  SimpleGTrackFitter _outfit;
+
+  // Maximum number of loops.
+  int _maxloop;
+
+public:  // methods
+
+  // Constructor.
+  // pprop is the internal propagator
+  // maxloop is the number of fit loops
+  BiGTrackFitter(const trf::PropagatorPtr& pprop, //cng D0ClusterRegistry* preg,
+		 double chsq_max, int maxloop=1);
+
+  // For backward compatibility.
+  BiGTrackFitter(const trf::PropagatorPtr& pprop /*cng , D0ClusterRegistry* preg=0*/);
+
+  // Fit a tracks.
+  int fit(GTrack& trg) const;
+
+};
+
+#endif

trf++/include/gtrfit

diff -N GTrackResidual.hpp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ GTrackResidual.hpp	15 Aug 2011 17:09:07 -0000	1.1
@@ -0,0 +1,51 @@

+// GTrackResidual.hpp
+
+#ifndef GTrackResidual_hpp
+#define GTrackResidual_hpp
+
+// Calculates residual (difference between cluster and track
+// measurement) for a track.
+
+#include "trfbase/PropagatorPtr.h"
+
+namespace {
+class GTrackResidualImp;
+}
+namespace trf {
+class Hit;
+class ETrack;
+}
+class GTrack;
+class GTrackState;
+
+class GTrackResidual {
+
+  GTrackResidualImp* _pimp;
+
+public:
+
+  // Constructor.
+  // Specify the propagator to use during fitting.
+  GTrackResidual(const trf::PropagatorPtr& pprop);
+
+  // Destructor.
+  ~GTrackResidual();
+
+  // Calculate a residual.
+  // The state must have a cluster.
+  // Return nonzero for error.
+  int calc(const GTrack& trg, const GTrackState& rstate);
+
+  // Return the track fitted at the hit surface using all
+  // clusters except the one at the specified surface.
+  const trf::ETrack& track() const;
+
+  // Return chisquare.
+  double chisq() const;
+
+  // Return the hit with prediction from the track.
+  const trf::Hit& hit() const;
+
+};
+
+#endif

trf++/include/gtrfit

diff -N GTrackSmoothingRefitter.hpp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ GTrackSmoothingRefitter.hpp	15 Aug 2011 17:09:07 -0000	1.1
@@ -0,0 +1,36 @@

+#ifndef GTRACKSMOOTHINGREFITTER_HPP
+#define GTRACKSMOOTHINGREFITTER_HPP
+
+#include "gtrfit/SimpleGTrackFitter.hpp"
+#include "gtrfit/GTrackSmoother.hpp"
+#include "trfbase/PropagatorPtr.h"
+
+//cng class D0ClusterRegistry;
+class GTrack;
+
+class GTrackSmoothingRefitter : public GTrackFitter {
+public :
+enum {
+  IN_OUT=1,
+  OUT_IN=-1
+};
+
+public:
+
+  // Refit in one direction (inside to outside or outside to inside) 
+  // and smooth in the other
+  GTrackSmoothingRefitter(const trf::PropagatorPtr&, //cng D0ClusterRegistry* ,
+			  int direction , double chsq);
+
+  // Fit a tracks.
+  int fit(GTrack& trg) const;
+
+
+protected:
+
+  SimpleGTrackFitter _fitter_inout, _fitter_outin;
+  GTrackSmoother _smoother;
+
+};
+
+#endif

trf++/include/gtrfit

diff -N GTrackSmoothingRefitter2.hpp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ GTrackSmoothingRefitter2.hpp	15 Aug 2011 17:09:07 -0000	1.1
@@ -0,0 +1,30 @@

+#ifndef GTRACKSMOOTHINGREFITTER2_HPP
+#define GTRACKSMOOTHINGREFITTER2_HPP
+
+#include "gtrfit/SimpleGTrackFitter.hpp"
+#include "gtrfit/GTrackSmoother.hpp"
+#include "trfbase/PropagatorPtr.h"
+
+//cng class D0ClusterRegistry;
+class GTrack;
+
+class GTrackSmoothingRefitter2 : public GTrackFitter {
+
+public:
+
+  // Refit in one direction (inside to outside or outside to inside) 
+  // and smooth in the other
+  GTrackSmoothingRefitter2(const trf::PropagatorPtr&, //cng D0ClusterRegistry*,
+			   double chsq);
+
+  // Fit a tracks.
+  int fit(GTrack& trg) const;
+
+
+private:
+
+  SimpleGTrackFitter _fitter_inout, _fitter_outin;
+
+};
+
+#endif