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EIC
tutorials
ip6_tutorial_1
Commits
c5fdeb17
Commit
c5fdeb17
authored
4 years ago
by
Whitney Armstrong
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new file: scripts/tutorial2_cell_size.cxx
parent
754cc8a4
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#10099
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4 years ago
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scripts/tutorial2_cell_size.cxx
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c5fdeb17
R__LOAD_LIBRARY
(
libfmt
.
so
)
#include
"fmt/core.h"
#include
"Math/Vector3D.h"
#include
"Math/Vector4D.h"
#include
"Math/VectorUtil.h"
#include
"ROOT/RDataFrame.hxx"
#include
"TCanvas.h"
#include
"TChain.h"
#include
"TF1.h"
#include
"TFile.h"
#include
"TH1D.h"
#include
"TH1F.h"
#include
"TLegend.h"
#include
"TMath.h"
#include
"TRandom3.h"
#include
"TTree.h"
#include
<algorithm>
#include
<iterator>
#include
<tuple>
#include
<vector>
#include
<cmath>
#include
"DD4hep/Detector.h"
#include
"DDRec/CellIDPositionConverter.h"
#include
"dd4pod/Geant4ParticleCollection.h"
#include
"dd4pod/TrackerHitCollection.h"
/** Hit position example.
*
*/
void
tutorial2_cell_size
(
const
char
*
fname
=
"gem_tracker_sim.root"
)
{
using
namespace
ROOT
::
Math
;
TChain
*
t
=
new
TChain
(
"events"
);
t
->
Add
(
fname
);
ROOT
::
RDataFrame
d0
(
*
t
,
{
"GEMTrackerHits"
,
"MCParticles"
});
//std::cout << d0.DescribeDataset() << std::endl;
// -------------------------
// Get the DD4hep instance
// Load the compact XML file
// Initialize the position converter tool
dd4hep
::
Detector
&
detector
=
dd4hep
::
Detector
::
getInstance
();
detector
.
fromCompact
(
"gem_tracker.xml"
);
dd4hep
::
rec
::
CellIDPositionConverter
cellid_converter
(
detector
);
// Simple lambda to define nhits branch
auto
nhits
=
[](
const
std
::
vector
<
dd4pod
::
TrackerHitData
>&
evt
)
{
return
(
int
)
evt
.
size
();
};
auto
local_position
=
[
&
](
const
std
::
vector
<
dd4pod
::
TrackerHitData
>&
hits
)
{
std
::
vector
<
std
::
array
<
double
,
2
>>
result
;
for
(
const
auto
&
h
:
hits
)
{
// The actual hit position:
auto
pos0
=
(
h
.
position
);
// **This is the most important part.** It provides a way of getting the
// geometry information in a flexible way.
// The segmentation hit postion:
auto
pos1
=
cellid_converter
.
position
(
h
.
cellID
);
fmt
::
print
(
" Hit Position : {},{},{}
\n
"
,
pos0
.
x
/
10.0
,
pos0
.
y
/
10.0
,
pos0
.
z
/
10.0
);
fmt
::
print
(
"Segmentation-Cell Position : {},{},{}
\n
"
,
pos1
.
x
(),
pos1
.
y
(),
pos1
.
z
());
auto
context
=
cellid_converter
.
findContext
(
h
.
cellID
)
;
dd4hep
::
Readout
r
=
cellid_converter
.
findReadout
(
context
->
element
)
;
dd4hep
::
Segmentation
seg
=
r
.
segmentation
()
;
auto
cell_dim
=
seg
.
cellDimensions
(
h
.
cellID
);
std
::
cout
<<
" dim "
;
for
(
const
auto
&
dim
:
cell_dim
)
{
std
::
cout
<<
dim
<<
", "
;
}
std
::
cout
<<
"
\n
"
;
result
.
push_back
({
pos0
.
x
/
10.0
-
pos1
.
x
(),
pos0
.
y
/
10.0
-
pos1
.
y
()});
}
return
result
;
};
auto
x_pos
=
[
&
](
const
std
::
vector
<
std
::
array
<
double
,
2
>>&
xypos
)
{
std
::
vector
<
double
>
result
;
for
(
const
auto
&
h
:
xypos
)
{
result
.
push_back
(
h
.
at
(
0
));
}
return
result
;
};
auto
y_pos
=
[
&
](
const
std
::
vector
<
std
::
array
<
double
,
2
>>&
xypos
)
{
std
::
vector
<
double
>
result
;
for
(
auto
h
:
xypos
)
{
result
.
push_back
(
h
.
at
(
1
));
}
return
result
;
};
auto
d1
=
d0
.
Define
(
"nhits"
,
nhits
,
{
"GEMTrackerHits"
})
.
Filter
([
=
](
const
std
::
vector
<
dd4pod
::
TrackerHitData
>&
hits
)
{
for
(
auto
h
:
hits
)
{
auto
pos
=
ROOT
::
Math
::
XYZVector
(
h
.
position
.
x
,
h
.
position
.
y
,
h
.
position
.
z
);
if
((
pos
.
r
()
>
100.0
)
&&
(
std
::
abs
(
pos
.
phi
()
-
M_PI
/
2.0
)
<
M_PI
/
6
))
{
return
true
;
}
}
return
false
;
},
{
"GEMTrackerHits"
})
.
Define
(
"xy_hit_pos"
,
local_position
,
{
"GEMTrackerHits"
})
.
Define
(
"x_pos"
,
x_pos
,
{
"xy_hit_pos"
})
.
Define
(
"y_pos"
,
y_pos
,
{
"xy_hit_pos"
});
auto
h_local_pos
=
d1
.
Histo2D
(
TH2D
(
"h_local_pos"
,
";x [cm]; y [cm] "
,
100
,
-
5.0
,
5.0
,
100
,
-
5.0
,
5.0
),
"x_pos"
,
"y_pos"
);
TCanvas
*
c
=
new
TCanvas
();
h_local_pos
->
DrawClone
(
"colz"
);
c
->
SaveAs
(
"results/hit_position.png"
);
}
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