diff -u -r1.17 -r1.18
--- Helix.java	28 Oct 2005 19:56:22 -0000	1.17
+++ Helix.java	30 Oct 2005 06:10:04 -0000	1.18
@@ -20,7 +20,7 @@

  * All quantities in this class are dimensionless. It has no dependencies
  * except for Hep3Vector (which could easily be removed).
  * @author tonyj

- * @version $Id: Helix.java,v 1.17 2005/10/28 19:56:22 jstrube Exp $

+ * @version $Id: Helix.java,v 1.18 2005/10/30 06:10:04 jstrube Exp $

  */
 public class Helix implements Trajectory
 {

@@ -50,8 +50,6 @@

       sinLambda = sin(lambda);
       xCenter = origin.x() + radius*sin(phi);
       yCenter = origin.y() - radius*cos(phi);

-      phiToCenter = atan2(yCenter,xCenter);
-      radiusOfCenter = sqrt(xCenter*xCenter + yCenter*yCenter);

    }
 
    /**

@@ -67,6 +65,15 @@

       return new BasicHep3Vector(x,y,z);
    }
 

+   public double getRadius() {
+       return radius;
+   }
+   
+   
+   public Hep3Vector getCenterXY() {
+       return new BasicHep3Vector(xCenter, yCenter, 0);
+   }
+   

    
    public double getDistanceToZPlane(double z)
    {

@@ -80,6 +87,8 @@

     */
    public double getDistanceToInfiniteCylinder(double r)
    {

+       double phiToCenter = atan2(yCenter,xCenter);
+       double radiusOfCenter = sqrt(xCenter*xCenter + yCenter*yCenter);

        // Negative radius doesn't make sense
       if (r<0) throw new IllegalArgumentException("radius "+r+"<0");
       double darg  = r*r/(2.*radius*radiusOfCenter) - radiusOfCenter/(2.*radius) - radius/(2.*radiusOfCenter);

@@ -192,6 +201,4 @@

    private double sinPhi;
    private double cosPhi;
    private double phi;

-   private double phiToCenter;
-   private double radiusOfCenter;

 }