1 /*
2 * Encapsulate parameters for a straight line through two hits. The straight line
3 * is parameterized by specifying a point of closest approach and the azimuthal
4 * angle of the line.
5 */
6
7 package org.lcsim.fit.twopointcircle;
8
9 /**
10 * @author Richard Partridge
11 */
12 public class TwoPointLineFit {
13 private double _x0;
14 private double _y0;
15 private double _phi0;
16 private double _s1;
17 private double _s2;
18
19 /**
20 * Fully qualified constructor.
21 *
22 * @param x0 x coordinate of point of closest approach
23 * @param y0 y coordinate of point of closest approach
24 * @param phi0 angle of line segment
25 * @param s1 distance to point 1
26 * @param s2 distance to point 2
27 */
28 public TwoPointLineFit(double x0, double y0, double phi0, double s1, double s2) {
29
30 _x0 = x0;
31 _y0 = y0;
32 _phi0 = phi0;
33 _s1 = s1;
34 _s2 = s2;
35 }
36
37 /**
38 * Return the x coordinate of the point of closest approach
39 *
40 * @return x coordinate
41 */
42 public double x0() {
43 return _x0;
44 }
45
46 /**
47 * Return the y coordinate of the point of closest approach
48 *
49 * @return y coordinate
50 */
51 public double y0() {
52 return _y0;
53 }
54
55 /**
56 * Return the azimuthal angle of the line segment going from point 1 to point 2
57 *
58 * @return azimuthal angle
59 */
60 public double phi0() {
61 return _phi0;
62 }
63
64 /**
65 * Return the distance from the point of closest approach to the first point
66 *
67 * @return distance to point 1
68 */
69 public double s1() {
70 return _s1;
71 }
72
73 /**
74 * Return the distance from the point of closest approach to the second point
75 *
76 * @return distance to point 2
77 */
78 public double s2() {
79 return _s2;
80 }
81 }