Gabriele Cosmo
271 lines
11 KiB
C++
271 lines
11 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4VSolid.hh,v 1.11 2002/10/28 11:25:37 gcosmo Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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//
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// class G4VSolid
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//
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// Class description:
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//
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// Abstract base class for solids, physical shapes that can be tracked through.
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// Each solid has a name, and the constructors and destructors automatically
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// add and subtract them from the G4SolidStore, a singleton `master' List
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// of available solids.
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//
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// This class defines, but does not implement, functions to compute
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// distances to/from the shape. Functions are also defined
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// to check whether a point is inside the shape, to return the
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// surface normal of the shape at a given point, and to compute
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// the extent of the shape. [see descriptions below]
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//
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// Some protected/private utility functions are implemented for the
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// clipping of regions for the computation of a solid's extent. Note that
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// the clipping mechanism is presently inefficient.
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//
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// Some visualization/graphics functions are also defined.
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//
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// Member Data:
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//
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// G4String fshapeName
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// - Name for this solid.
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// History:
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// 12.04.00 J.Allison Implemented GetExtent() in terms of CalculateExtent()
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// 17.06.98 J.Apostolakis Added pure virtual function GetEntityType()
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// 26.07.96 P.Kent Added ComputeDimensions for replication mechanism
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// 27.03.96 J.Allison Methods for visualisation
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// 30.06.95 P.Kent Initial version, no scoping or visualisation functions
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#ifndef G4VSOLID_HH
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#define G4VSOLID_HH
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#include "globals.hh"
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#include "geomdefs.hh"
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class G4AffineTransform;
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class G4VoxelLimits;
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class G4VPVParameterisation;
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class G4VPhysicalVolume;
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class G4VGraphicsScene;
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class G4Polyhedron;
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class G4NURBS;
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class G4VisExtent;
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class G4DisplacedSolid;
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#include "G4ThreeVector.hh"
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#include "g4std/vector"
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typedef G4std::vector<G4ThreeVector> G4ThreeVectorList;
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typedef G4String G4GeometryType;
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class G4VSolid
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{
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public: // with description
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G4VSolid(const G4String& name);
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// Creates a new shape, with the supplied name. No provision is made
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// for sharing a common name amongst multiple classes.
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virtual ~G4VSolid();
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// Default destructor.
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inline G4bool operator==( const G4VSolid& s ) const;
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// Return true only if addresses are the same.
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friend G4std::ostream& operator<< ( G4std::ostream& os, const G4VSolid& e );
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// Streaming operator, using DumpInfo().
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inline G4String GetName() const;
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// Returns the current shape's name.
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inline void SetName(const G4String& name);
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// Sets the current shape's name.
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virtual G4bool CalculateExtent(const EAxis pAxis,
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const G4VoxelLimits& pVoxelLimit,
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const G4AffineTransform& pTransform,
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G4double& pMin, G4double& pMax) const = 0;
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// Calculate the minimum and maximum extent of the solid, when under the
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// specified transform, and within the specified limits. If the solid
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// is not intersected by the region, return false, else return true.
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virtual EInside Inside(const G4ThreeVector& p) const = 0;
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// Returns kOutside if the point at offset p is outside the shapes
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// boundaries plus Tolerance/2, kSurface if the point is <=Tolerance/2
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// from a surface, otherwise kInside.
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virtual G4ThreeVector SurfaceNormal(const G4ThreeVector& p) const = 0;
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// Returns the outwards pointing unit normal of the shape for the
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// surface closest to the point at offset p.
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virtual G4double DistanceToIn(const G4ThreeVector& p,
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const G4ThreeVector& v) const = 0;
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// Return the distance along the normalised vector v to the shape,
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// from the point at offset p. If there is no intersection, return
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// kInfinity. The first intersection resulting from `leaving' a
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// surface/volume is discarded. Hence, it is tolerant of points on
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// the surface of the shape.
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virtual G4double DistanceToIn(const G4ThreeVector& p) const = 0;
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// Calculate the distance to the nearest surface of a shape from an
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// outside point. The distance can be an underestimate.
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virtual G4double DistanceToOut(const G4ThreeVector& p,
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const G4ThreeVector& v,
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const G4bool calcNorm=false,
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G4bool *validNorm=0,
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G4ThreeVector *n=0) const = 0;
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// Return the distance along the normalised vector v to the shape,
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// from a point at an offset p inside or on the surface of the shape.
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// Intersections with surfaces, when the point is <Tolerance/2 from a
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// surface must be ignored.
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// If calcNorm==true:
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// validNorm set true if the solid lies entirely behind or on the
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// exiting surface.
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// n set to exiting outwards normal vector (undefined Magnitude).
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// validNorm set to false if the solid does not lie entirely behind
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// or on the exiting surface
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// If calcNorm==false:
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// validNorm and n are unused.
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//
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// Must be called as solid.DistanceToOut(p,v) or by specifying all
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// the parameters.
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virtual G4double DistanceToOut(const G4ThreeVector& p) const = 0;
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// Calculate the distance to the nearest surface of a shape from an
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// inside point. The distance can be an underestimate.
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virtual void ComputeDimensions(G4VPVParameterisation* p,
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const G4int n,
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const G4VPhysicalVolume* pRep);
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// Throw exception if ComputeDimensions called frrom an illegal
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// derived class.
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virtual G4GeometryType GetEntityType() const = 0;
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// Provide identification of the class of an object.
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// (required for persistency and STEP interface)
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virtual G4std::ostream& StreamInfo(G4std::ostream& os) const = 0;
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// Dumps contents of the solid to a stream.
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inline void DumpInfo() const;
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// Dumps contents of the solid to the standard output.
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// Visualization functions
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virtual void DescribeYourselfTo (G4VGraphicsScene& scene) const = 0;
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// A "double dispatch" function which identifies the solid
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// to the graphics scene.
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virtual G4VisExtent GetExtent () const;
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// Provide extent (bounding box) as possible hint to the graphics view.
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virtual G4Polyhedron* CreatePolyhedron () const;
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virtual G4NURBS* CreateNURBS () const;
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// Create a G4Polyhedron/G4NURBS/... (It is the caller's responsibility
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// to delete it). A null pointer means "not created".
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virtual const G4VSolid* GetConstituentSolid(G4int no) const;
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virtual G4VSolid* GetConstituentSolid(G4int no);
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// If the solid is made up from a Boolean operation of two solids,
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// return the "no" solid. If the solid is not a "Boolean", return 0.
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virtual const G4DisplacedSolid* GetDisplacedSolidPtr() const;
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virtual G4DisplacedSolid* GetDisplacedSolidPtr();
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// If the solid is a "G4DisplacedSolid", return a self pointer
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// else return 0.
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// virtual G4ThreeVectorList*
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// CreateRotatedVertices(const G4AffineTransform& pTransform) const = 0 ;
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protected: // with description
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void CalculateClippedPolygonExtent(G4ThreeVectorList& pPolygon,
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const G4VoxelLimits& pVoxelLimit,
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const EAxis pAxis,
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G4double& pMin, G4double& pMax) const;
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// Calculate the maximum and minimum extents of the convex polygon
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// pPolygon along the axis pAxis, within the limits pVoxelLimit.
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//
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// If the minimum is <pMin pMin is set to the new minimum.
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// If the maximum is >pMax pMax is set to the new maximum.
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//
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// Modifications to pPolygon are made - it is left in an undefined state.
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void ClipCrossSection(G4ThreeVectorList* pVertices,
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const G4int pSectionIndex,
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const G4VoxelLimits& pVoxelLimit,
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const EAxis pAxis,
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G4double& pMin, G4double& pMax) const;
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// Calculate the maximum and minimum extents of the polygon described
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// by the vertices: pSectionIndex->pSectionIndex+1->
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// pSectionIndex+2->pSectionIndex+3->pSectionIndex
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// in the List pVertices.
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//
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// If the minimum is <pMin pMin is set to the new minimum.
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// If the maximum is >pMax pMax is set to the new maximum.
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//
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// No modifications are made to pVertices.
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void ClipBetweenSections(G4ThreeVectorList* pVertices,
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const G4int pSectionIndex,
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const G4VoxelLimits& pVoxelLimit,
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const EAxis pAxis,
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G4double& pMin, G4double& pMax) const;
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// Calculate the maximum and minimum extents of the polygons
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// joining the CrossSections at pSectionIndex->pSectionIndex+3 and
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// pSectionIndex+4->pSectionIndex7
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// in the List pVertices, within the boundaries of the voxel limits
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// pVoxelLimit.
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//
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// If the minimum is <pMin pMin is set to the new minimum.
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// If the maximum is >pMax pMax is set to the new maximum.
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//
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// No modifications are made to pVertices.
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void ClipPolygon( G4ThreeVectorList& pPolygon,
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const G4VoxelLimits& pVoxelLimit,
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const EAxis pAxis ) const;
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// Clip the specified convex polygon to the given limits, where
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// the polygon is described by the vertices at (0),(1),...,(n),(0) in
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// pPolygon.
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// If the polygon is completely clipped away, the polygon is cleared.
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private:
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void ClipPolygonToSimpleLimits(G4ThreeVectorList& pPolygon,
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G4ThreeVectorList& outputPolygon,
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const G4VoxelLimits& pVoxelLimit ) const;
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// Clip the specified convex polygon to the given limits, storing the
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// result in outputPolygon. The voxel limits must be limited in one
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// *plane* only: This is achieved by having only x or y or z limits,
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// and either the minimum or maximum limit set to -+kInfinity
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// respectively.
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G4String fshapeName; // Name
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};
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#include "G4VSolid.icc"
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#endif
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