package org.lcsim.recon.tracking.digitization.sisim;
   /*
    * TrackSegment.java
    *
    * Created on July 27, 2005, 3:34 PM
    *
    * To change this template, choose Tools | Options and locate the template under
    * the Source Creation and Management node. Right-click the template and choose
    * Open. You can then make changes to the template in the Source Editor.
   */
  
  import hep.physics.vec.Hep3Vector;
  import hep.physics.vec.BasicHep3Vector;
  import hep.physics.vec.VecOp;
  
  import org.lcsim.event.SimTrackerHit;
  import org.lcsim.detector.ITransform3D;
  
  import java.util.*;
  
  /**
   *
   * @author tknelson
   */
  public class TrackSegment
  {
      
      // Fields
      private Hep3Vector _p1;
      private Hep3Vector _p2;
      private double _energy_loss;
      
      /**
       * Creates a new instance of TrackSegment
       */
      
      public TrackSegment(Hep3Vector p1, Hep3Vector p2, double energy_loss)
      {
          _p1 = p1;
          _p2 = p2;
          _energy_loss = energy_loss;
      }
      
      public TrackSegment(SimTrackerHit hit)
      {
          _p1 = new BasicHep3Vector(hit.getStartPoint());
          _p2 = new BasicHep3Vector(hit.getEndPoint());
          _energy_loss = hit.getdEdx();
      }
      
      // Accessors
      public Hep3Vector getP1()
      {
          return _p1;
      }
      
      public Hep3Vector getP2()
      {
          return _p2;
      }
      
      public double getEloss()
      {
          return _energy_loss;
      }
      
      public Hep3Vector getVector()
      {
          return VecOp.sub(_p2,_p1);
      }
      
      public Hep3Vector getDirection()
      {
          return VecOp.unit(getVector());
      }
      
      public double getLength()
      {
          return getVector().magnitude();
      }
      
      public double getDedx()
      {
          return _energy_loss/getLength();
      }
      
      public void transform(ITransform3D transformation)
      {
          transformation.transform(_p1);
          transformation.transform(_p2);
      }
      
  }