lcsim-contrib/src/main/java/org/lcsim/contrib/onoprien/util/swim

diff -u -r1.5 -r1.6
--- Helix.java	24 Feb 2009 02:59:34 -0000	1.5
+++ Helix.java	26 Feb 2009 19:01:28 -0000	1.6
@@ -9,7 +9,7 @@

  * Helical {@link Trajectory} with its axis parallel to Z.
  *
  * @author D. Onoprienko

- * @version $Id: Helix.java,v 1.5 2009/02/24 02:59:34 onoprien Exp $

+ * @version $Id: Helix.java,v 1.6 2009/02/26 19:01:28 onoprien Exp $

  */
 public class Helix extends AbstractTrajectory {
   

@@ -395,7 +395,15 @@

   }
   
   private void repCtoV() {

-    throw new UnsupportedOperationException();  // FIXME

+    double d2 = 1./(1.+_tan*_tan);
+    double d = Math.sqrt(d2);
+    double cos = Math.cos(_phi0);
+    double sin = Math.sin(_phi0);
+    _dir = new ConstHep3Vector(d*cos, d*sin, Math.signum(_tan) * Math.sqrt(1.-d2));
+    double x0 = _ref.x() - _d0 * sin;
+    double y0 = _ref.y() + _d0 * cos;
+    _orig = new ConstHep3Vector(x0, y0, _z0);
+    _ro = d * _c;

   }
 
 // -- Private parts :  ---------------------------------------------------------

@@ -410,7 +418,7 @@

   SymmetricMatrix _covW; // covariance matrix in VRep representation
   SymmetricMatrix _covC; // covariance matrix in CRep representation
 

-  double _ro; // - sqrt(dx**2+dy**2) * _c

+  double _ro; //  sqrt(dx**2+dy**2) * _c

   
   static private final double TWOPI = 2. * Math.PI;
   static private final String ERR1 = "Reference point not set";