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DetectorGeometry - source file

// $Id: DetectorGeometry.cc,v 1.4 2005/04/14 17:04:34 thea Exp $
// Author: Alessandro Thea   2005/03/10

/*****************************************************************************
 * ESAF: Euso Simulation and Analysis Framework                              *
 *                                                                           *
 *  Id: DetectorGeometry                                                     *
 *  Package: Optics                                                          *
 *  Coordinator: Alessandro.Thea                                             *
 *                                                                           *
 *****************************************************************************/

//_____________________________________________________________________________
//
// DetectorGeometry
//
// Contains the fundamental information of the detector seen from "outside":
// Position, orientation in the space, external radius and field of view.     
//

#include "DetectorGeometry.hh"
#include "EarthVector.hh"

ClassImp(DetectorGeometry)

//_____________________________________________________________________________
DetectorGeometry::DetectorGeometry() : EsafRefSys() {
    //
    // Constructor
    //

}

//_____________________________________________________________________________
DetectorGeometry::~DetectorGeometry() {
    //
    // Destructor
    //
}

//_____________________________________________________________________________
 Double_t DetectorGeometry::SolidAngle(const EarthVector& pos) const {
    //
    // Returns the solid angle made by Euso pupil as seen from pos
    //
    // //FIXME : if detector tilting, formula change
    //
    EarthVector inter = GetPos() - pos;
    Double_t th = inter.Theta();
    
    //return 2*pi*(pow(sin(0.5*atan( sqrt(r*r*cos(th)/inter.Mag2()) )),2));
    return pi*GetRadius()*GetRadius()*cos(th)/inter.Mag2();    
}
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