1 package org.lcsim.recon.tracking.trfbase;
2 /** Derived from propagator and add a modifiable default direction.
3 * We implement the methods that do not specify a direction using
4 * those that do.
5 *
6 * @author Norman A. Graf
7 * @version 1.0
8 */
9 public abstract class PropDirected extends Propagator
10 {
11
12 private PropDir _dir;
13
14 //
15
16 /**
17 *constructor with default direction = NEAREST
18 *
19 */
20 public PropDirected()
21 {
22 direction( PropDir.NEAREST );
23 }
24
25 //
26
27 /**
28 *constructor from direction
29 *
30 * @param dir Direction in which to propagate
31 */
32 public PropDirected(PropDir dir)
33 {
34 direction( dir );
35 }
36
37 //
38
39 /**
40 *set the default direction
41 *
42 * @param dir direction in which to propagate
43 */
44 public void direction(PropDir dir)
45 {
46 _dir = dir;
47 }
48
49 //
50
51 /**
52 *get the default direction
53 *
54 * @return the default direction in which to propagate
55 */
56 public PropDir direction()
57 {
58 return _dir;
59 }
60
61 //
62
63 /**
64 *Propagate a track without error in the default direction.
65 *
66 * @param trv VTrack to propagate
67 * @param srf Surface to which to propagate
68 * @param tder TrackDerivative to update at srf
69 * @return propagation status
70 */
71 public PropStat vecProp(VTrack trv, Surface srf,
72 TrackDerivative tder )
73 {
74 return vecDirProp(trv, srf, _dir, tder);
75 }
76
77 //
78
79 /**
80 *Propagate a track with error in the default direction.
81 *
82 * @param trv ETrack to propagate
83 * @param srf Surface to which to propagate
84 * @param tder TrackDerivative to update at srf
85 * @return propagation status
86 */
87 public PropStat errProp( ETrack trv, Surface srf,
88 TrackDerivative tder )
89 {
90 return errDirProp(trv, srf, _dir, tder);
91 }
92 }