Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4BoundingSphereScene.cc,v 2.4 1998/11/23 10:12:16 allison Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+// 
+// John Allison  7th June 1997
+// An artificial scene to reuse G4VScene code to calculate a bounding sphere.
+
+#include "G4BoundingSphereScene.hh"
+
+#include "G4VSolid.hh"
+#include "G4Vector3D.hh"
+
+G4BoundingSphereScene::G4BoundingSphereScene ():
+  fRadius (-1.),
+  fpObjectTransformation (0)
+{}
+
+G4BoundingSphereScene::~G4BoundingSphereScene () {}
+
+G4VisExtent G4BoundingSphereScene::GetBoundingSphereExtent () {
+  return G4VisExtent (fCentre, fRadius);
+}
+
+void G4BoundingSphereScene::Accrue (const G4VSolid& solid) {
+  const G4VisExtent& thisExtent = solid.GetExtent ();
+  G4Point3D thisCentre = thisExtent.GetExtentCentre ();
+  if (fpObjectTransformation) {
+    thisCentre.transform (*fpObjectTransformation);
+  }
+  const G4double thisRadius = thisExtent.GetExtentRadius ();
+  AccrueBoundingSphere (thisCentre, thisRadius);
+  /***********************************************
+    G4cout << "G4BoundingSphereScene::Accrue: centre: " << fCentre
+           << ", radius: " << fRadius << endl;
+  ***********************************************/
+}
+
+void G4BoundingSphereScene::ResetBoundingSphere () {
+  fCentre = G4Point3D ();
+  fRadius = -1.;
+  fpObjectTransformation = 0;
+}
+
+void G4BoundingSphereScene::AccrueBoundingSphere
+(const G4Point3D& thisCentre,
+ G4double thisRadius) {
+
+  if (fRadius < 0 ) {  // First time.
+    fCentre = thisCentre;
+    fRadius = thisRadius;
+  }
+  else {
+    G4Vector3D join = thisCentre - fCentre;
+    if (join == G4Vector3D (0., 0., 0.)) {             // Centres coincide.
+      if (fRadius < thisRadius) fRadius = thisRadius;
+    }
+    else if (join.mag () + thisRadius <= fRadius) {  // Inside accrued sphere.
+      // Do nothing.
+    }
+    else {
+      G4Vector3D unitJoin = join.unit ();
+      G4Point3D extremity1 = fCentre - fRadius * unitJoin;
+      G4Point3D extremity2 = thisCentre + thisRadius * unitJoin;
+      fCentre = 0.5 * (extremity2 + extremity1);
+      fRadius = 0.5 * (extremity2 - extremity1).mag ();
+    }
+  }
+}