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Reference Guide
TTRAP.cxx
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1 // @(#)root/g3d:$Id$
2 // Author: Nenad Buncic 19/09/95
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #include "TTRAP.h"
13 #include "TNode.h"
14 #include "TMath.h"
15 
17 
18 /** \class TTRAP
19 \ingroup g3d
20 A general trapezoid.
21 
22 \image html g3d_trap.png
23 
24 The faces perpendicular to z are trapezia and
25 their centres are not necessarily on a line parallel to the z axis.
26 This shape has 14 parameters.
27 
28  - name: name of the shape
29  - title: shape's title
30  - material: (see TMaterial)
31  - dz: half-length along the z axis
32  - theta: polar angle of the line joining the centre of the face
33  at -DZ to the centre of the one at +DZ
34  - phi: azimuthal angle of the line joining the centre of the face
35  at -DZ to the centre of the one at +DZ
36  - h1: half-length along y of the face at -DZ
37  - bl1: half-length along x of the side at -H1 in y of the face
38  at -DZ in z
39  - tl1: half-length along x of the side at +H1 in y of the face
40  at -DZ in z
41  - alpha1: angle with respect to the y axis from the centre of the
42  side at -H1 in y to the centre of the side at +H1 in y
43  of the face at -DZ in z
44  - h2: half-length along y of the face at +DZ
45  - bl2: half-length along x of the side at -H2 in y of the
46  face at +DZ in z
47  - tl2: half-length along x of the side at +H2 in y of the face
48  at +DZ in z
49  - alpha2: angle with respect to the y axis from the centre of the side
50  at -H2 in y to the centre of the side at +H2 in y of the
51  face at +DZ in z
52 */
53 
54 ////////////////////////////////////////////////////////////////////////////////
55 /// TRAP shape default constructor
56 
58 {
59  fH1 = 0.;
60  fBl1 = 0.;
61  fTl1 = 0.;
62  fAlpha1 = 0.;
63  fH2 = 0.;
64  fBl2 = 0.;
65  fTl2 = 0.;
66  fAlpha2 = 0.;
67 }
68 
69 ////////////////////////////////////////////////////////////////////////////////
70 /// TRAP shape normal constructor
71 
72 TTRAP::TTRAP(const char *name, const char *title, const char *material, Float_t dz, Float_t theta, Float_t phi,
73  Float_t h1, Float_t bl1, Float_t tl1, Float_t alpha1, Float_t h2,
74  Float_t bl2, Float_t tl2, Float_t alpha2) : TBRIK(name, title,material,theta,phi,dz)
75 {
76  fH1 = h1;
77  fBl1 = bl1;
78  fTl1 = tl1;
79  fAlpha1 = alpha1;
80  fH2 = h2;
81  fBl2 = bl2;
82  fTl2 = tl2;
83  fAlpha2 = alpha2;
84 }
85 
86 ////////////////////////////////////////////////////////////////////////////////
87 /// TRAP shape default destructor
88 
90 {
91 }
92 
93 ////////////////////////////////////////////////////////////////////////////////
94 /// Create TRAP points
95 
97 {
98  const Float_t pi = Float_t (TMath::Pi());
99  Float_t alpha1 = fAlpha1 * pi/180.0;
100  Float_t alpha2 = fAlpha2 * pi/180.0;
101  Float_t theta = TBRIK::fDx * pi/180.0;
102  Float_t phi = TBRIK::fDy * pi/180.0;
103  Float_t tth = TMath::Tan(theta);
104  Float_t tx = tth*TMath::Cos(phi);
105  Float_t ty = tth*TMath::Sin(phi);
106  Float_t tth1 = TMath::Tan(alpha1);
107  Float_t tth2 = TMath::Tan(alpha2);
108 
109  if (points) {
110  points[ 0] = -fDz*tx-tth1*fH1-fBl1 ; points[ 1] = -fH1-fDz*ty ; points[ 2] = -fDz;
111  points[ 3] = -fDz*tx+tth1*fH1-fTl1 ; points[ 4] = fH1-fDz*ty ; points[ 5] = -fDz;
112  points[ 6] = -fDz*tx+tth1*fH1+fTl1 ; points[ 7] = fH1-fDz*ty ; points[ 8] = -fDz;
113  points[ 9] = -fDz*tx-tth1*fH1+fBl1 ; points[10] = -fH1-fDz*ty ; points[11] = -fDz;
114  points[12] = fDz*tx-tth2*fH2-fBl2 ; points[13] = -fH2+fDz*ty ; points[14] = fDz;
115  points[15] = fDz*tx+tth2*fH2-fTl2 ; points[16] = fH2+fDz*ty ; points[17] = fDz;
116  points[18] = fDz*tx+tth2*fH2+fTl2 ; points[19] = fH2+fDz*ty ; points[20] = fDz;
117  points[21] = fDz*tx-tth2*fH2+fBl2 ; points[22] = -fH2+fDz*ty ; points[23] = fDz;
118  }
119 
120 }
Float_t fTl2
Definition: TTRAP.h:41
Float_t fAlpha1
Definition: TTRAP.h:38
const double pi
float Float_t
Definition: RtypesCore.h:53
Float_t fBl2
Definition: TTRAP.h:40
Float_t fDx
Definition: TBRIK.h:29
virtual ~TTRAP()
TRAP shape default destructor.
Definition: TTRAP.cxx:89
Float_t fH2
Definition: TTRAP.h:39
Float_t fBl1
Definition: TTRAP.h:36
TH1F * h1
Definition: legend1.C:5
constexpr Double_t Pi()
Definition: TMath.h:40
Float_t fH1
Definition: TTRAP.h:35
point * points
Definition: X3DBuffer.c:20
A general trapezoid.
Definition: TTRAP.h:33
Double_t Cos(Double_t)
Definition: TMath.h:551
A box with faces perpendicular to the axes.
Definition: TBRIK.h:26
TTRAP()
TRAP shape default constructor.
Definition: TTRAP.cxx:57
#define ClassImp(name)
Definition: Rtypes.h:336
double Double_t
Definition: RtypesCore.h:55
Float_t fTl1
Definition: TTRAP.h:37
Double_t Sin(Double_t)
Definition: TMath.h:548
Double_t Tan(Double_t)
Definition: TMath.h:554
Float_t fDy
Definition: TBRIK.h:30
Float_t fDz
Definition: TBRIK.h:31
virtual void SetPoints(Double_t *points) const
Create TRAP points.
Definition: TTRAP.cxx:96
Float_t fAlpha2
Definition: TTRAP.h:42