ROOT  6.06/09
Reference Guide
TPARA.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 "TPARA.h"
13 #include "TNode.h"
14 #include "TMath.h"
15 
17 
18 /** \class TPARA
19 \ingroup g3d
20 A parallelepiped.
21 
22 \image html g3d_para.png
23 It has 9 parameters:
24 
25  - name: name of the shape
26  - title: shape's title
27  - material: (see TMaterial)
28  - dx: half-length in x
29  - dy: half-length in y
30  - dz: half-length in z
31  - alpha: angle formed by the y axis and by the plane joining the
32  centre of the faces parallel to the z-x plane at -DY and +DY
33  - theta: polar angle of the line joining the centres of the faces
34  at -DZ and +DZ in z
35  - phi: azimuthal angle of the line joining the centres of the
36  faces at -DZ and +DZ in z
37 */
38 
39 ////////////////////////////////////////////////////////////////////////////////
40 /// PARA shape default constructor
41 
42 TPARA::TPARA()
43 {
44  fAlpha = 0.;
45  fTheta = 0.;
46  fPhi = 0.;
47 }
48 
49 ////////////////////////////////////////////////////////////////////////////////
50 /// PARA shape normal constructor
51 
52 TPARA::TPARA(const char *name, const char *title, const char *material, Float_t dx, Float_t dy, Float_t dz,
53  Float_t alpha, Float_t theta, Float_t phi) : TBRIK(name, title,material, dx, dy, dz)
54 {
55  fAlpha = alpha;
56  fTheta = theta;
57  fPhi = phi;
58 }
59 
60 ////////////////////////////////////////////////////////////////////////////////
61 /// PARA shape default destructor
62 
64 {
65 }
66 
67 ////////////////////////////////////////////////////////////////////////////////
68 /// Create PARA points
69 
71 {
72  if (!points) return;
73  Float_t dx, dy, dz, theta, phi, alpha;
74  const Float_t pi = Float_t (TMath::Pi());
75 
76  alpha = fAlpha * pi/180.0;
77  theta = fTheta * pi/180.0;
78  phi = fPhi * pi/180.0;
79 
80  dx = TBRIK::fDx;
81  dy = TBRIK::fDy;
82  dz = TBRIK::fDz;
83 
84  // Parallelepiped change angles to tangents (by Pavel Nevski 12/04/99)
85  Double_t txy = TMath::Tan(alpha);
86  Double_t tth = TMath::Tan(theta);
87  Double_t txz = tth*TMath::Cos(phi);
88  Double_t tyz = tth*TMath::Sin(phi);
89 
90  *points++ = -dz*txz-txy*dy-dx ; *points++ = -dy-dz*tyz ; *points++ = -dz;
91  *points++ = -dz*txz+txy*dy-dx ; *points++ = +dy-dz*tyz ; *points++ = -dz; //3
92  *points++ = -dz*txz+txy*dy+dx ; *points++ = +dy-dz*tyz ; *points++ = -dz;
93  *points++ = -dz*txz-txy*dy+dx ; *points++ = -dy-dz*tyz ; *points++ = -dz;//1
94  *points++ = +dz*txz-txy*dy-dx ; *points++ = -dy+dz*tyz ; *points++ = +dz;
95  *points++ = +dz*txz+txy*dy-dx ; *points++ = +dy+dz*tyz ; *points++ = +dz;//7
96  *points++ = +dz*txz+txy*dy+dx ; *points++ = +dy+dz*tyz ; *points++ = +dz;
97  *points++ = +dz*txz-txy*dy+dx ; *points++ = -dy+dz*tyz ; *points++ = +dz;//5
98 }
Float_t fPhi
Definition: TPARA.h:36
const double pi
float Float_t
Definition: RtypesCore.h:53
A parallelepiped.
Definition: TPARA.h:32
Float_t fTheta
Definition: TPARA.h:35
Float_t fDx
Definition: TBRIK.h:31
Float_t fAlpha
Definition: TPARA.h:34
virtual void SetPoints(Double_t *points) const
Create PARA points.
Definition: TPARA.cxx:70
point * points
Definition: X3DBuffer.c:20
Double_t Cos(Double_t)
Definition: TMath.h:424
Double_t Pi()
Definition: TMath.h:44
A box with faces perpendicular to the axes.
Definition: TBRIK.h:28
#define ClassImp(name)
Definition: Rtypes.h:279
double Double_t
Definition: RtypesCore.h:55
#define name(a, b)
Definition: linkTestLib0.cpp:5
Double_t Sin(Double_t)
Definition: TMath.h:421
virtual ~TPARA()
PARA shape default destructor.
Definition: TPARA.cxx:63
Double_t Tan(Double_t)
Definition: TMath.h:427
Float_t fDy
Definition: TBRIK.h:32
Float_t fDz
Definition: TBRIK.h:33