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G4ArrowModel.cc
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29// John Allison 15th July 2012
30// Model that knows how to draw an arrow.
31
32#include "G4ArrowModel.hh"
33
35#include "G4VGraphicsScene.hh"
36#include "G4VisAttributes.hh"
37#include "G4Tubs.hh"
38#include "G4Tet.hh"
39#include "G4Polyhedron.hh"
40#include "G4Vector3D.hh"
41#include "G4Point3D.hh"
42#include "G4Transform3D.hh"
44
46{
47 delete fpHeadPolyhedron;
48 delete fpShaftPolyhedron;
49}
50
52(G4double x1, G4double y1, G4double z1,
53 G4double x2, G4double y2, G4double z2,
54 G4double width, const G4Colour& colour,
55 const G4String& description,
56 G4int lineSegmentsPerCircle,
58: fpShaftPolyhedron(nullptr)
59, fpHeadPolyhedron(nullptr)
60, fTransform(transform)
61{
62 fType = "G4ArrowModel";
64 fGlobalDescription = fType + ": " + description;
66 (std::min(x1,x2),
67 std::max(x1,x2),
68 std::min(y1,y2),
69 std::max(y1,y2),
70 std::min(z1,z2),
71 std::max(z1,z2));
72
73 // Force number of line segments per circle (aka number of rotation steps)
75 G4Polyhedron::SetNumberOfRotationSteps(lineSegmentsPerCircle);
76
77 // Make a cylinder slightly shorter than the arrow length so that it
78 // doesn't stick out of the head.
80 G4double shaftLength = std::sqrt
81 (std::pow(x2-x1,2)+std::pow(y2-y1,2)+std::pow(z2-z1,2));
82 if (shaftLength < tolerance) shaftLength = tolerance;
83 G4double shaftRadius = width/2.;
84 if (shaftRadius > shaftLength/100.) shaftRadius = shaftLength/100.;
85 if (shaftRadius < tolerance) shaftRadius = tolerance;
86 const G4double halfShaftLength = shaftLength/2.;
87 const G4double halfReduction = 4.*shaftRadius;
88 G4double halfLength = halfShaftLength - halfReduction;
89 if (halfLength < tolerance) halfLength = tolerance;
90 const G4Tubs shaft("shaft",0.,shaftRadius,halfLength,0.,twopi);
92 // Move it a little so that the tail is at z = -halfShaftLength.
94 fpShaftPolyhedron->Transform(G4Translate3D(0,0,-halfReduction));
95
96 // Locate the head at +halfShaftLength.
97 const G4double zHi = halfShaftLength;
98 const G4double zLow = halfShaftLength - 12.*shaftRadius;
99 const G4double rExt = 8. * shaftRadius;
100 const G4double xExt = std::sqrt(3.)*rExt/2.;
101 const G4Tet head("head",
102 G4ThreeVector(0.,0.,zHi),
103 G4ThreeVector(0.,rExt,zLow),
104 G4ThreeVector(xExt,-rExt/2.,zLow),
105 G4ThreeVector(-xExt,-rExt/2.,zLow));
107
108 // Transform to position
109 const G4Vector3D arrowDirection = G4Vector3D(x2-x1,y2-y1,z2-z1).unit();
110 const G4double theta = arrowDirection.theta();
111 const G4double phi = arrowDirection.phi();
112 const G4Point3D arrowCentre(0.5*(x1+x2),0.5*(y1+y2),0.5*(z1+z2));
113 const G4Transform3D tr =
114 G4Translate3D(arrowCentre) * G4RotateZ3D(phi) * G4RotateY3D(theta);
117
119 va.SetColour(colour);
120 va.SetForceSolid(true);
123
124 // Restore number of line segments per circle
126}
127
129{
131 sceneHandler.BeginPrimitives(fTransform);
132 sceneHandler.AddPrimitive(*fpShaftPolyhedron);
133 sceneHandler.AddPrimitive(*fpHeadPolyhedron);
134 sceneHandler.EndPrimitives();
135 }
136}
static constexpr double twopi
Definition: G4SIunits.hh:56
CLHEP::Hep3Vector G4ThreeVector
HepGeom::RotateZ3D G4RotateZ3D
HepGeom::Translate3D G4Translate3D
HepGeom::RotateY3D G4RotateY3D
double G4double
Definition: G4Types.hh:83
int G4int
Definition: G4Types.hh:85
HepGeom::Vector3D< G4double > G4Vector3D
Definition: G4Vector3D.hh:34
G4ArrowModel(G4double x1, G4double y1, G4double z1, G4double x2, G4double y2, G4double z2, G4double width, const G4Colour &colour, const G4String &description="", G4int lineSegmentsPerCircle=6, const G4Transform3D &transform=G4Transform3D())
Definition: G4ArrowModel.cc:52
virtual ~G4ArrowModel()
Definition: G4ArrowModel.cc:45
G4Transform3D fTransform
Definition: G4ArrowModel.hh:71
G4Polyhedron * fpShaftPolyhedron
Definition: G4ArrowModel.hh:69
G4Polyhedron * fpHeadPolyhedron
Definition: G4ArrowModel.hh:70
void DescribeYourselfTo(G4VGraphicsScene &) override
G4double GetRadialTolerance() const
static G4GeometryTolerance * GetInstance()
Definition: G4Tet.hh:56
G4Polyhedron * CreatePolyhedron() const
Definition: G4Tet.cc:687
Definition: G4Tubs.hh:75
G4Polyhedron * CreatePolyhedron() const
Definition: G4Tubs.cc:1759
virtual void BeginPrimitives(const G4Transform3D &objectTransformation=G4Transform3D())=0
virtual void AddPrimitive(const G4Polyline &)=0
virtual void EndPrimitives()=0
G4VisExtent fExtent
Definition: G4VModel.hh:101
G4String fGlobalDescription
Definition: G4VModel.hh:100
G4String fType
Definition: G4VModel.hh:98
G4String fGlobalTag
Definition: G4VModel.hh:99
void SetColour(const G4Colour &)
void SetForceSolid(G4bool=true)
void SetVisAttributes(const G4VisAttributes *)
Definition: G4Visible.cc:96
BasicVector3D< T > unit() const
static void SetNumberOfRotationSteps(G4int n)
static G4int GetNumberOfRotationSteps()
HepPolyhedron & Transform(const G4Transform3D &t)
T max(const T t1, const T t2)
brief Return the largest of the two arguments
T min(const T t1, const T t2)
brief Return the smallest of the two arguments
G4bool transform(G4String &input, const G4String &type)