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26 // 26 //
>> 27 // $Id$
27 // 28 //
28 // 29 //
29 // John Allison 15th July 2012 30 // John Allison 15th July 2012
30 // Model that knows how to draw an arrow. 31 // Model that knows how to draw an arrow.
31 32
32 #include "G4ArrowModel.hh" 33 #include "G4ArrowModel.hh"
33 34
34 #include "G4PhysicalConstants.hh" 35 #include "G4PhysicalConstants.hh"
35 #include "G4VGraphicsScene.hh" 36 #include "G4VGraphicsScene.hh"
36 #include "G4VisAttributes.hh" 37 #include "G4VisAttributes.hh"
37 #include "G4Tubs.hh" 38 #include "G4Tubs.hh"
38 #include "G4Tet.hh" << 39 #include "G4GenericPolycone.hh"
39 #include "G4Polyhedron.hh" 40 #include "G4Polyhedron.hh"
40 #include "G4Vector3D.hh" 41 #include "G4Vector3D.hh"
41 #include "G4Point3D.hh" 42 #include "G4Point3D.hh"
42 #include "G4Transform3D.hh" 43 #include "G4Transform3D.hh"
43 #include "G4GeometryTolerance.hh" <<
44 <<
45 #include <cmath> <<
46 44
47 G4ArrowModel::~G4ArrowModel () 45 G4ArrowModel::~G4ArrowModel ()
48 { 46 {
49 delete fpHeadPolyhedron; 47 delete fpHeadPolyhedron;
50 delete fpShaftPolyhedron; 48 delete fpShaftPolyhedron;
51 } 49 }
52 50
53 G4ArrowModel::G4ArrowModel 51 G4ArrowModel::G4ArrowModel
54 (G4double x1, G4double y1, G4double z1, 52 (G4double x1, G4double y1, G4double z1,
55 G4double x2, G4double y2, G4double z2, 53 G4double x2, G4double y2, G4double z2,
56 G4double width, const G4Colour& colour, 54 G4double width, const G4Colour& colour,
57 const G4String& description, 55 const G4String& description,
58 G4int lineSegmentsPerCircle, << 56 G4int lineSegmentsPerCircle)
59 const G4Transform3D& transform) <<
60 : fpShaftPolyhedron(nullptr) <<
61 , fpHeadPolyhedron(nullptr) <<
62 , fTransform(transform) <<
63 { 57 {
64 fType = "G4ArrowModel"; 58 fType = "G4ArrowModel";
65 fGlobalTag = fType; 59 fGlobalTag = fType;
66 fGlobalDescription = fType + ": " + descript 60 fGlobalDescription = fType + ": " + description;
67 fExtent = G4VisExtent 61 fExtent = G4VisExtent
68 (std::min(x1,x2), 62 (std::min(x1,x2),
69 std::max(x1,x2), 63 std::max(x1,x2),
70 std::min(y1,y2), 64 std::min(y1,y2),
71 std::max(y1,y2), 65 std::max(y1,y2),
72 std::min(z1,z2), 66 std::min(z1,z2),
73 std::max(z1,z2)); 67 std::max(z1,z2));
74 68
75 // Force number of line segments per circle 69 // Force number of line segments per circle (aka number of rotation steps)
76 G4int tempN = G4Polyhedron::GetNumberOfRotat 70 G4int tempN = G4Polyhedron::GetNumberOfRotationSteps();
77 G4Polyhedron::SetNumberOfRotationSteps(lineS 71 G4Polyhedron::SetNumberOfRotationSteps(lineSegmentsPerCircle);
78 72
79 // Make a cylinder slightly shorter than the 73 // Make a cylinder slightly shorter than the arrow length so that it
80 // doesn't stick out of the head. 74 // doesn't stick out of the head.
81 const G4double tolerance = G4GeometryToleran << 75 const G4double shaftLength = std::sqrt
82 << 76 (std::pow(x2-x1,2)+std::pow(y2-y1,2)+std::pow(z2-z1,2));
83 G4double totalLength = std::hypot(x2-x1, y2- << 77 G4double shaftRadius = width/2.;
84 if (totalLength < tolerance) << 78 // Limit the radius
85 {totalLength = tolerance;} << 79 if (shaftRadius > shaftLength/100.) shaftRadius = shaftLength/100.;
86 << 80 const G4double halfShaftLength = shaftLength/2.;
87 G4double shaftRadius = width/6.; << 81 const G4double halfReduction = 4.*shaftRadius;
88 if (shaftRadius < tolerance) << 82 const G4double halfLength = halfShaftLength-halfReduction;
89 {shaftRadius = tolerance;} << 83 G4Tubs shaft("shaft",0.,shaftRadius,halfLength,0.,twopi);
90 <<
91 // case 1 - arrow length >> width -> arrow h <<
92 // case 2 - arrow length < width -> arrow h <<
93 G4double arrowLength = std::min(1.5*width, 0 <<
94 <<
95 G4double shaftLength = totalLength - arrowLe <<
96 if (shaftLength < 2*tolerance) <<
97 {shaftLength = 2*tolerance;} <<
98 <<
99 const G4Tubs shaft("shaft",0.,shaftRadius,0. <<
100 fpShaftPolyhedron = shaft.CreatePolyhedron() 84 fpShaftPolyhedron = shaft.CreatePolyhedron();
101 // translate the polyhedron down w.r.t. the << 85 // Move it a little so that the tail is at z = -halfShaftLength.
102 if (fpShaftPolyhedron) << 86 fpShaftPolyhedron->Transform(G4Translate3D(0,0,-halfReduction));
103 {fpShaftPolyhedron->Transform(G4Translate3 <<
104 87
105 // Locate the head at +halfShaftLength. 88 // Locate the head at +halfShaftLength.
106 const G4double zHi = 0.5*totalLength; << 89 const G4int numRZ = 3;
107 const G4double zLow = zHi - arrowLength; << 90 G4double r[] = {0,4,0};
108 const G4double rExt = 0.5*width; << 91 G4double z[] = {0,-6,-4};
109 const G4double xExt = std::sqrt(3.)*rExt/2.; << 92 for (G4int i = 0; i < numRZ; i++) {
110 const G4Tet head("head", << 93 r[i] *= 2.*shaftRadius;
111 G4ThreeVector(0.,0.,zHi), << 94 z[i] = halfShaftLength + z[i] * 2.*shaftRadius;
112 G4ThreeVector(0.,rExt,zLow) << 95 }
113 G4ThreeVector(xExt,-rExt/2. << 96 G4GenericPolycone head("head",0,twopi,numRZ,r,z);
114 G4ThreeVector(-xExt,-rExt/2 <<
115 fpHeadPolyhedron = head.CreatePolyhedron(); 97 fpHeadPolyhedron = head.CreatePolyhedron();
116 98
117 // Transform to position 99 // Transform to position
118 const G4Vector3D arrowDirection = G4Vector3D 100 const G4Vector3D arrowDirection = G4Vector3D(x2-x1,y2-y1,z2-z1).unit();
119 const G4double theta = arrowDirection.theta( 101 const G4double theta = arrowDirection.theta();
120 const G4double phi = arrowDirection.phi(); 102 const G4double phi = arrowDirection.phi();
121 const G4Point3D arrowCentre(0.5*(x1+x2),0.5* 103 const G4Point3D arrowCentre(0.5*(x1+x2),0.5*(y1+y2),0.5*(z1+z2));
122 const G4Transform3D tr = 104 const G4Transform3D tr =
123 G4Translate3D(arrowCentre) * G4RotateZ3D(p 105 G4Translate3D(arrowCentre) * G4RotateZ3D(phi) * G4RotateY3D(theta);
124 if (fpShaftPolyhedron) fpShaftPolyhedron->Tr << 106 fpShaftPolyhedron->Transform(tr);
125 if (fpHeadPolyhedron) fpHeadPolyhedron->Tran << 107 fpHeadPolyhedron->Transform(tr);
126 108
127 G4VisAttributes va; 109 G4VisAttributes va;
128 va.SetColour(colour); 110 va.SetColour(colour);
129 va.SetForceSolid(true); 111 va.SetForceSolid(true);
130 if (fpShaftPolyhedron) fpShaftPolyhedron->Se << 112 fpShaftPolyhedron->SetVisAttributes(va);
131 if (fpHeadPolyhedron) fpHeadPolyhedron->SetV << 113 fpHeadPolyhedron->SetVisAttributes(va);
132 114
133 // Restore number of line segments per circl 115 // Restore number of line segments per circle
134 G4Polyhedron::SetNumberOfRotationSteps(tempN 116 G4Polyhedron::SetNumberOfRotationSteps(tempN);
135 } 117 }
136 118
137 void G4ArrowModel::DescribeYourselfTo (G4VGrap 119 void G4ArrowModel::DescribeYourselfTo (G4VGraphicsScene& sceneHandler)
138 { 120 {
139 if (fpShaftPolyhedron && fpHeadPolyhedron) { << 121 sceneHandler.BeginPrimitives();
140 sceneHandler.BeginPrimitives(fTransform); << 122 sceneHandler.AddPrimitive(*fpShaftPolyhedron);
141 sceneHandler.AddPrimitive(*fpShaftPolyhedr << 123 sceneHandler.AddPrimitive(*fpHeadPolyhedron);
142 sceneHandler.AddPrimitive(*fpHeadPolyhedro << 124 sceneHandler.EndPrimitives();
143 sceneHandler.EndPrimitives(); <<
144 } <<
145 } 125 }
146 126