lcsim/src/org/lcsim/fit/helicaltrack

diff -u -r1.2 -r1.3
--- HelicalTrack2DHit.java	10 Jun 2008 19:35:09 -0000	1.2
+++ HelicalTrack2DHit.java	10 Jun 2008 20:11:54 -0000	1.3
@@ -34,6 +34,12 @@

         _zmin = zmin;
         _zmax = zmax;
     }

+    
+    public HelicalTrack2DHit(double x, double y, double z, double drphi, double zmin, double zmax) {
+        super (x, y, z, drphi, Math.abs(zmax-zmin) / Math.sqrt(12));
+        _zmin = zmin;
+        _zmax = zmax;
+    }

 
     public HelicalTrack2DHit(TrackerHit hit, Hep3Vector pos, SymmetricMatrix cov, double zmin, double zmax) {
         super(hit, pos, cov);

lcsim/src/org/lcsim/fit/helicaltrack

diff -u -r1.4 -r1.5
--- HelicalTrack3DHit.java	10 Jun 2008 19:35:09 -0000	1.4
+++ HelicalTrack3DHit.java	10 Jun 2008 20:11:54 -0000	1.5
@@ -37,6 +37,11 @@

         _dz = Math.sqrt(cov.e(2,2));
     }
     

+    public HelicalTrack3DHit(double x, double y, double z, double drphi, double dz){
+        super(x, y, z, drphi, dz);
+        _dz = dz;
+    }
+    

     /**
      * Return the uncertainty in the z coordinate
      * @return uncertainty in the z coordinate

lcsim/src/org/lcsim/fit/helicaltrack

diff -u -r1.7 -r1.8
--- HelicalTrackHit.java	10 Jun 2008 19:35:09 -0000	1.7
+++ HelicalTrackHit.java	10 Jun 2008 20:11:54 -0000	1.8
@@ -50,6 +50,17 @@

         this(hit, new BasicHep3Vector(hit.getPosition()), new SymmetricMatrix(3, hit.getCovMatrix(), true));
     }
     

+    public HelicalTrackHit(double x, double y, double z, double drphi, double dz) {
+        this(null, new BasicHep3Vector(x, y, z), new SymmetricMatrix(3));
+        double phi = Math.atan2(y, x);
+        double sphi = Math.sin(phi);
+        double cphi = Math.cos(phi);
+        _cov.setElement(0, 0, sphi*sphi * drphi*drphi);
+        _cov.setElement(0, 1, -sphi * cphi * drphi*drphi);
+        _cov.setElement(1, 1, cphi*cphi * drphi*drphi);
+        _cov.setElement(2, 2, dz*dz);
+    }
+    

     public HelicalTrackHit(TrackerHit hit, Hep3Vector pos, SymmetricMatrix cov) {
         _trackerhit = hit;
         _pos = pos;