/
track.go
216 lines (193 loc) · 5.21 KB
/
track.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
// Copyright 2017 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lcio
import (
"bytes"
"fmt"
"strings"
"go-hep.org/x/hep/sio"
)
// TrackContainer is a collection of tracks.
type TrackContainer struct {
Flags Flags
Params Params
Tracks []Track
}
type Track struct {
Type int32 // type of track (e.g TPC, VTX, SIT)
States []TrackState
Chi2 float32 // chi^2 of fit
NdF int32 // ndf of fit
DEdx float32 // dEdx
DEdxErr float32 // error of dEdx
Radius float32 // radius of innermost hit used in track fit
SubDetHits []int32 // number of hits in particular sub-detectors
Tracks []*Track // tracks that have been combined into this track
Hits []*TrackerHit
}
func (trk *Track) D0() float64 {
if len(trk.States) <= 0 {
return 0
}
return float64(trk.States[0].D0)
}
func (trk *Track) Phi() float64 {
if len(trk.States) <= 0 {
return 0
}
return float64(trk.States[0].Phi)
}
func (trk *Track) Omega() float64 {
if len(trk.States) <= 0 {
return 0
}
return float64(trk.States[0].Omega)
}
func (trk *Track) Z0() float64 {
if len(trk.States) <= 0 {
return 0
}
return float64(trk.States[0].Z0)
}
func (trk *Track) TanL() float64 {
if len(trk.States) <= 0 {
return 0
}
return float64(trk.States[0].TanL)
}
type TrackState struct {
Loc int32 // location of the track state
D0 float32 // impact parameter in r-phi
Phi float32 // phi of track in r-phi
Omega float32 // curvature signed with charge
Z0 float32 // impact parameter in r-z
TanL float32 // tangent of dip angle in r-z
Cov [15]float32 // covariance matrix
Ref [3]float32 // reference point (x,y,z)
}
func (trks *TrackContainer) String() string {
o := new(bytes.Buffer)
fmt.Fprintf(o, "%[1]s print out of Track collection %[1]s\n\n", strings.Repeat("-", 15))
fmt.Fprintf(o, " flag: 0x%x\n%v", trks.Flags, trks.Params)
fmt.Fprintf(o, " LCIO::TRBIT_HITS : %v\n", trks.Flags.Test(BitsClHits))
fmt.Fprintf(o, "\n")
const (
head = " [ id ] | type | d0 | phi | omega | z0 | tan lambda| reference point(x,y,z) | dEdx | dEdxErr | chi2 | ndf \n"
tail = "------------|----------|----------|----------|----------|-----------|-----------|---------------------------------|----------|----------|-------- \n"
)
fmt.Fprintf(o, head)
fmt.Fprintf(o, tail)
for i := range trks.Tracks {
trk := &trks.Tracks[i]
var ref [3]float32
if len(trk.States) > 0 {
ref = trk.States[0].Ref
}
fmt.Fprintf(o,
"[%09d] | %08d |%+.2e |%+.2e |%+.2e |%+.3e |%+.3e |(%+.2e, %+.2e, %+.2e)|%+.2e |%+.2e |%+.2e |%5d\n",
ID(trk),
trk.Type, trk.D0(), trk.Phi(), trk.Omega(), trk.Z0(), trk.TanL(),
ref[0], ref[1], ref[2],
trk.DEdx, trk.DEdxErr, trk.Chi2, trk.NdF,
)
}
return string(o.Bytes())
}
func (*TrackContainer) VersionSio() uint32 {
return Version
}
func (trks *TrackContainer) MarshalSio(w sio.Writer) error {
enc := sio.NewEncoder(w)
enc.Encode(&trks.Flags)
enc.Encode(&trks.Params)
enc.Encode(int32(len(trks.Tracks)))
for i := range trks.Tracks {
trk := &trks.Tracks[i]
enc.Encode(&trk.Type)
enc.Encode(int32(len(trk.States)))
for i := range trk.States {
state := &trk.States[i]
enc.Encode(&state.Loc)
enc.Encode(&state.D0)
enc.Encode(&state.Phi)
enc.Encode(&state.Omega)
enc.Encode(&state.Z0)
enc.Encode(&state.TanL)
enc.Encode(&state.Cov)
enc.Encode(&state.Ref)
}
enc.Encode(&trk.Chi2)
enc.Encode(&trk.NdF)
enc.Encode(&trk.DEdx)
enc.Encode(&trk.DEdxErr)
enc.Encode(&trk.Radius)
enc.Encode(&trk.SubDetHits)
enc.Encode(int32(len(trk.Tracks)))
for i := range trk.Tracks {
enc.Pointer(&trk.Tracks[i])
}
if trks.Flags.Test(BitsTrHits) {
enc.Encode(int32(len(trk.Hits)))
for i := range trk.Hits {
enc.Pointer(&trk.Hits[i])
}
}
enc.Tag(trk)
}
return enc.Err()
}
func (trks *TrackContainer) UnmarshalSio(r sio.Reader) error {
dec := sio.NewDecoder(r)
dec.Decode(&trks.Flags)
dec.Decode(&trks.Params)
var n int32
dec.Decode(&n)
trks.Tracks = make([]Track, int(n))
for i := range trks.Tracks {
trk := &trks.Tracks[i]
dec.Decode(&trk.Type)
var n int32 = 1 // set to 1 by default for bwd compat
if r.VersionSio() >= 2000 {
dec.Decode(&n)
}
trk.States = make([]TrackState, int(n))
for i := range trk.States {
state := &trk.States[i]
if r.VersionSio() >= 2000 {
dec.Decode(&state.Loc)
}
dec.Decode(&state.D0)
dec.Decode(&state.Phi)
dec.Decode(&state.Omega)
dec.Decode(&state.Z0)
dec.Decode(&state.TanL)
dec.Decode(&state.Cov)
dec.Decode(&state.Ref)
}
dec.Decode(&trk.Chi2)
dec.Decode(&trk.NdF)
dec.Decode(&trk.DEdx)
dec.Decode(&trk.DEdxErr)
dec.Decode(&trk.Radius)
dec.Decode(&trk.SubDetHits)
dec.Decode(&n)
trk.Tracks = make([]*Track, int(n))
for i := range trk.Tracks {
dec.Pointer(&trk.Tracks[i])
}
if trks.Flags.Test(BitsTrHits) {
dec.Decode(&n)
trk.Hits = make([]*TrackerHit, int(n))
for i := range trk.Hits {
dec.Pointer(&trk.Hits[i])
}
}
dec.Tag(trk)
}
return dec.Err()
}
var (
_ sio.Versioner = (*TrackContainer)(nil)
_ sio.Codec = (*TrackContainer)(nil)
)