1 package org.lcsim.spacegeom;
2
3 import hep.physics.vec.Hep3Vector;
4
5 /**
6 * A SpaceVector is the representation of a vector in 3D space, where a vector is defined to have a direction and a length.
7 * SpaceVector objects know about their representation in cartesian, spherical and cylindrical coordinate systems.
8 * In distinction to points in space, vectors are invariant under translation and can be multiplied by a scalar.
9 * A scalar and a vector product is defined for vectors, and the difference between two SpacePoints is a SpaceVector.
10 * For interoperability with Freehep classes, SpaceVector implements the Hep3Vector interface.
11 *
12 *@version $Id: SpaceVector.java,v 1.1.1.1 2010/12/01 00:15:57 jeremy Exp $
13 */
14 public class SpaceVector extends SpacePoint
15 {
16
17 /**
18 * A vector of zero length doesn't make sense
19 */
20 SpaceVector()
21 {
22 }
23
24 /**
25 * Constructor from a SpacePoint
26 * Creates a vector from (0,0,0) to this point
27 * @param spt SpacePoint to point to
28 */
29 public SpaceVector(Hep3Vector spt)
30 {
31 super(spt);
32 }
33
34 /**
35 * Output Stream
36 *
37 * @return String representation of object
38 */
39 public String toString()
40 {
41 return _representation + " SpaceVector: " + "\n" +
42 " x: " + x() + "\n" +
43 " y: " + y() + "\n" +
44 " z: " + z() + "\n" +
45 " rxy: " + rxy() + "\n" +
46 " rxyz: " + rxyz() + "\n" +
47 " phi: " + phi() + "\n" +
48 "theta: " + theta() + "\n" ;
49 }
50
51 }