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28 // 28 //
29 // John Allison 15th July 2012 29 // John Allison 15th July 2012
30 // Model that knows how to draw an arrow. 30 // Model that knows how to draw an arrow.
31 31
32 #include "G4ArrowModel.hh" 32 #include "G4ArrowModel.hh"
33 33
34 #include "G4PhysicalConstants.hh" 34 #include "G4PhysicalConstants.hh"
35 #include "G4VGraphicsScene.hh" 35 #include "G4VGraphicsScene.hh"
36 #include "G4VisAttributes.hh" 36 #include "G4VisAttributes.hh"
37 #include "G4Tubs.hh" 37 #include "G4Tubs.hh"
38 #include "G4Tet.hh" 38 #include "G4Tet.hh"
39 #include "G4Polyhedron.hh" 39 #include "G4Polyhedron.hh"
40 #include "G4Vector3D.hh" 40 #include "G4Vector3D.hh"
41 #include "G4Point3D.hh" 41 #include "G4Point3D.hh"
42 #include "G4Transform3D.hh" 42 #include "G4Transform3D.hh"
43 #include "G4GeometryTolerance.hh" 43 #include "G4GeometryTolerance.hh"
44 44
45 #include <cmath> <<
46 <<
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) 57 : fpShaftPolyhedron(nullptr)
61 , fpHeadPolyhedron(nullptr) 58 , fpHeadPolyhedron(nullptr)
62 , fTransform(transform) <<
63 { 59 {
64 fType = "G4ArrowModel"; 60 fType = "G4ArrowModel";
65 fGlobalTag = fType; 61 fGlobalTag = fType;
66 fGlobalDescription = fType + ": " + descript 62 fGlobalDescription = fType + ": " + description;
67 fExtent = G4VisExtent 63 fExtent = G4VisExtent
68 (std::min(x1,x2), 64 (std::min(x1,x2),
69 std::max(x1,x2), 65 std::max(x1,x2),
70 std::min(y1,y2), 66 std::min(y1,y2),
71 std::max(y1,y2), 67 std::max(y1,y2),
72 std::min(z1,z2), 68 std::min(z1,z2),
73 std::max(z1,z2)); 69 std::max(z1,z2));
74 70
75 // Force number of line segments per circle 71 // Force number of line segments per circle (aka number of rotation steps)
76 G4int tempN = G4Polyhedron::GetNumberOfRotat 72 G4int tempN = G4Polyhedron::GetNumberOfRotationSteps();
77 G4Polyhedron::SetNumberOfRotationSteps(lineS 73 G4Polyhedron::SetNumberOfRotationSteps(lineSegmentsPerCircle);
78 74
79 // Make a cylinder slightly shorter than the 75 // Make a cylinder slightly shorter than the arrow length so that it
80 // doesn't stick out of the head. 76 // doesn't stick out of the head.
81 const G4double tolerance = G4GeometryToleran 77 const G4double tolerance = G4GeometryTolerance::GetInstance()->GetRadialTolerance();
82 << 78 G4double shaftLength = std::sqrt
83 G4double totalLength = std::hypot(x2-x1, y2- << 79 (std::pow(x2-x1,2)+std::pow(y2-y1,2)+std::pow(z2-z1,2));
84 if (totalLength < tolerance) << 80 if (shaftLength < tolerance) shaftLength = tolerance;
85 {totalLength = tolerance;} << 81 G4double shaftRadius = width/2.;
86 << 82 if (shaftRadius > shaftLength/100.) shaftRadius = shaftLength/100.;
87 G4double shaftRadius = width/6.; << 83 if (shaftRadius < tolerance) shaftRadius = tolerance;
88 if (shaftRadius < tolerance) << 84 const G4double halfShaftLength = shaftLength/2.;
89 {shaftRadius = tolerance;} << 85 const G4double halfReduction = 4.*shaftRadius;
90 << 86 G4double halfLength = halfShaftLength - halfReduction;
91 // case 1 - arrow length >> width -> arrow h << 87 if (halfLength < tolerance) halfLength = tolerance;
92 // case 2 - arrow length < width -> arrow h << 88 const G4Tubs shaft("shaft",0.,shaftRadius,halfLength,0.,twopi);
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() 89 fpShaftPolyhedron = shaft.CreatePolyhedron();
101 // translate the polyhedron down w.r.t. the << 90 // Move it a little so that the tail is at z = -halfShaftLength.
102 if (fpShaftPolyhedron) 91 if (fpShaftPolyhedron)
103 {fpShaftPolyhedron->Transform(G4Translate3 << 92 fpShaftPolyhedron->Transform(G4Translate3D(0,0,-halfReduction));
104 93
105 // Locate the head at +halfShaftLength. 94 // Locate the head at +halfShaftLength.
106 const G4double zHi = 0.5*totalLength; << 95 const G4double zHi = halfShaftLength;
107 const G4double zLow = zHi - arrowLength; << 96 const G4double zLow = halfShaftLength - 12.*shaftRadius;
108 const G4double rExt = 0.5*width; << 97 const G4double rExt = 8. * shaftRadius;
109 const G4double xExt = std::sqrt(3.)*rExt/2.; 98 const G4double xExt = std::sqrt(3.)*rExt/2.;
110 const G4Tet head("head", 99 const G4Tet head("head",
111 G4ThreeVector(0.,0.,zHi), 100 G4ThreeVector(0.,0.,zHi),
112 G4ThreeVector(0.,rExt,zLow) 101 G4ThreeVector(0.,rExt,zLow),
113 G4ThreeVector(xExt,-rExt/2. 102 G4ThreeVector(xExt,-rExt/2.,zLow),
114 G4ThreeVector(-xExt,-rExt/2 103 G4ThreeVector(-xExt,-rExt/2.,zLow));
115 fpHeadPolyhedron = head.CreatePolyhedron(); 104 fpHeadPolyhedron = head.CreatePolyhedron();
116 105
117 // Transform to position 106 // Transform to position
118 const G4Vector3D arrowDirection = G4Vector3D 107 const G4Vector3D arrowDirection = G4Vector3D(x2-x1,y2-y1,z2-z1).unit();
119 const G4double theta = arrowDirection.theta( 108 const G4double theta = arrowDirection.theta();
120 const G4double phi = arrowDirection.phi(); 109 const G4double phi = arrowDirection.phi();
121 const G4Point3D arrowCentre(0.5*(x1+x2),0.5* 110 const G4Point3D arrowCentre(0.5*(x1+x2),0.5*(y1+y2),0.5*(z1+z2));
122 const G4Transform3D tr = 111 const G4Transform3D tr =
123 G4Translate3D(arrowCentre) * G4RotateZ3D(p 112 G4Translate3D(arrowCentre) * G4RotateZ3D(phi) * G4RotateY3D(theta);
124 if (fpShaftPolyhedron) fpShaftPolyhedron->Tr 113 if (fpShaftPolyhedron) fpShaftPolyhedron->Transform(tr);
125 if (fpHeadPolyhedron) fpHeadPolyhedron->Tran 114 if (fpHeadPolyhedron) fpHeadPolyhedron->Transform(tr);
126 115
127 G4VisAttributes va; 116 G4VisAttributes va;
128 va.SetColour(colour); 117 va.SetColour(colour);
129 va.SetForceSolid(true); 118 va.SetForceSolid(true);
130 if (fpShaftPolyhedron) fpShaftPolyhedron->Se 119 if (fpShaftPolyhedron) fpShaftPolyhedron->SetVisAttributes(va);
131 if (fpHeadPolyhedron) fpHeadPolyhedron->SetV 120 if (fpHeadPolyhedron) fpHeadPolyhedron->SetVisAttributes(va);
132 121
133 // Restore number of line segments per circl 122 // Restore number of line segments per circle
134 G4Polyhedron::SetNumberOfRotationSteps(tempN 123 G4Polyhedron::SetNumberOfRotationSteps(tempN);
135 } 124 }
136 125
137 void G4ArrowModel::DescribeYourselfTo (G4VGrap 126 void G4ArrowModel::DescribeYourselfTo (G4VGraphicsScene& sceneHandler)
138 { 127 {
139 if (fpShaftPolyhedron && fpHeadPolyhedron) { << 128 sceneHandler.BeginPrimitives();
140 sceneHandler.BeginPrimitives(fTransform); << 129 if (fpShaftPolyhedron) sceneHandler.AddPrimitive(*fpShaftPolyhedron);
141 sceneHandler.AddPrimitive(*fpShaftPolyhedr << 130 if (fpHeadPolyhedron) sceneHandler.AddPrimitive(*fpHeadPolyhedron);
142 sceneHandler.AddPrimitive(*fpHeadPolyhedro << 131 sceneHandler.EndPrimitives();
143 sceneHandler.EndPrimitives(); <<
144 } <<
145 } 132 }
146 133