/* ======================================================================== *\ ! ! * ! * This file is part of MARS, the MAGIC Analysis and Reconstruction ! * Software. It is distributed to you in the hope that it can be a useful ! * and timesaving tool in analysing Data of imaging Cerenkov telescopes. ! * It is distributed WITHOUT ANY WARRANTY. ! * ! * Permission to use, copy, modify and distribute this software and its ! * documentation for any purpose is hereby granted without fee, ! * provided that the above copyright notice appear in all copies and ! * that both that copyright notice and this permission notice appear ! * in supporting documentation. It is provided "as is" without express ! * or implied warranty. ! * ! ! ! Author(s): Thomas Bretz 12/2000 ! Author(s): Harald Kornmayer 1/2001 ! Author(s): Rudolf Bock 10/2001 ! Author(s): Wolfgang Wittek 06/2002 ! ! Copyright: MAGIC Software Development, 2000-2002 ! ! \* ======================================================================== */ ///////////////////////////////////////////////////////////////////////////// // // MHillasSrc // // Storage Container for image parameters // // source-dependent image parameters // // // Version 1: // ---------- // fAlpha angle between major axis and line source-to-center // fDist distance from source to center of ellipse // // // Version 2: // ---------- // fHeadTail added // // // Version 3: // ---------- // fCosDeltaAlpha cosine of angle between d and a, where // - d is the vector from the source position to the // center of the ellipse // - a is a vector along the main axis of the ellipse, // defined with positive x-component // // // Version 4: // ---------- // fHeadTail removed // // // Version 5: // ---------- // - added Float_t fDCA; // [mm] Distance to closest approach 'DCA' // - added Float_t fDCADelta; // [deg] Angle of the shower axis with respect // to the x-axis [0,2pi] // ///////////////////////////////////////////////////////////////////////////// #include "MHillasSrc.h" #include #include #include #include "MLog.h" #include "MLogManip.h" #include "MGeomCam.h" #include "MHillas.h" #include "MSrcPosCam.h" ClassImp(MHillasSrc); using namespace std; // -------------------------------------------------------------------------- // // Default constructor. // MHillasSrc::MHillasSrc(const char *name, const char *title) { fName = name ? name : "MHillasSrc"; fTitle = title ? title : "Parameters depending in source position"; } void MHillasSrc::Reset() { fDist = -1; fAlpha = 0; fCosDeltaAlpha = 0; fDCA = -1; fDCADelta = 0; } // -------------------------------------------------------------------------- // // Calculation of source-dependent parameters // In case you don't call Calc from within an eventloop make sure, that // you call the Reset member function before. // Int_t MHillasSrc::Calc(const MHillas &hillas, double abberation) { const Double_t mx = hillas.GetMeanX(); // [mm] const Double_t my = hillas.GetMeanY(); // [mm] // The abberation value corrects for the average shift of // the CoG of a light distirbution in the camera by the optics. // The FACT refelctor for example reflects the CoG to a point // 2% further away than the master ray. This could be corrected // moving all pixels (in the image parameter calculation) 2% // outwards. Instead, simply the source position 'reflected' // (as if it were the master ray) is moved 2% inwards in the // camera. const Double_t sx = mx - fSrcPos->GetX()/abberation; // [mm] const Double_t sy = my - fSrcPos->GetY()/abberation; // [mm] const Double_t sd = hillas.GetSinDelta(); // [1] const Double_t cd = hillas.GetCosDelta(); // [1] // // Distance from source position to center of ellipse. // If the distance is 0 distance, Alpha is not specified. // The calculation has failed and returnes kFALSE. // const Double_t dist = TMath::Sqrt(sx*sx + sy*sy); // [mm] if (dist==0) return 1; // // Calculate Alpha and Cosda = cos(d,a) // The sign of Cosda will be used for quantities containing // a head-tail information // // *OLD* const Double_t arg = (sy-tand*sx) / (dist*sqrt(tand*tand+1)); // *OLD* fAlpha = asin(arg)*kRad2Deg; // const Double_t arg2 = cd*sx + sd*sy; // [mm] if (arg2==0) return 2; const Double_t arg1 = cd*sy - sd*sx; // [mm] // // Due to numerical uncertanties in the calculation of the // square root (dist) and arg1 it can happen (in less than 1e-5 cases) // that the absolute value of arg exceeds 1. Because this uncertainty // results in an Delta Alpha which is still less than 1e-3 we don't care // about this uncertainty in general and simply set values which exceed // to 1 saving its sign. // const Double_t arg = arg1/dist; fAlpha = TMath::Abs(arg)>1 ? TMath::Sign(90., arg) : TMath::ASin(arg)*TMath::RadToDeg(); // [deg] fCosDeltaAlpha = arg2/dist; // [1] fDist = dist; // [mm] // ----- Calculation of Distance to closest approach 'DCA' ----- // Components of DCA vector const Double_t fpd1 = sx - arg2*cd; // [mm] const Double_t fpd2 = sy - arg2*sd; // [mm] // Determine the correct sign of the DCA (cross product of DCA vector and the // vector going from the intersection point of the DCA vector with the shower axis // to the COG) const Double_t sign = arg2*cd*fpd2 - arg2*sd*fpd1; fDCA = TMath::Sign(TMath::Sqrt(fpd1*fpd1 + fpd2*fpd2), sign); // [mm] // Calculate angle of the shower axis with respect to the x-axis fDCADelta = TMath::ACos((sx-fpd1)/TMath::Abs(arg2))*TMath::RadToDeg(); // [deg] // Enlarge the interval of fDdca to [0, 2pi] if (sy < fpd2) fDCADelta = 360 - fDCADelta; SetReadyToSave(); return 0; } void MHillasSrc::Paint(Option_t *opt) { const Float_t x = fSrcPos ? fSrcPos->GetX() : 0; const Float_t y = fSrcPos ? fSrcPos->GetY() : 0; TMarker m; m.SetMarkerColor(kYellow); m.SetMarkerStyle(kStar); m.PaintMarker(x, y); /* m.SetMarkerColor(kMagenta); m.PaintMarker(fDist*cos((fDCADelta-fAlpha)*TMath::DegToRad()), fDist*sin((fDCADelta-fAlpha)*TMath::DegToRad())); TLine line; line.SetLineWidth(1); line.SetLineColor(108); line.PaintLine(-radius, y, radius, y); line.PaintLine(x, -radius, x, radius); // COG line TLine line(x, y, meanX, meanY); line.SetLineWidth(1); line.SetLineColor(2); line.Paint();*/ } // -------------------------------------------------------------------------- // // Print contents of MHillasSrc to *fLog // void MHillasSrc::Print(Option_t *) const { *fLog << all; *fLog << GetDescriptor() << endl; *fLog << " - Dist [mm] = " << fDist << endl; *fLog << " - Alpha [deg] = " << fAlpha << endl; *fLog << " - CosDeltaAlpha = " << fCosDeltaAlpha << endl; *fLog << " - DCA [mm] = " << fDCA << endl; *fLog << " - DCA delta [deg] = " << fDCADelta << endl; } // -------------------------------------------------------------------------- // // Print contents of MHillasSrc to *fLog depending on the geometry in // units of deg. // void MHillasSrc::Print(const MGeomCam &geom) const { *fLog << all; *fLog << GetDescriptor() << endl; *fLog << " - Dist [deg] = " << fDist*geom.GetConvMm2Deg() << endl; *fLog << " - Alpha [deg] = " << fAlpha << endl; *fLog << " - CosDeltaAlpha = " << fCosDeltaAlpha << endl; *fLog << " - DCA [deg] = " << fDCA*geom.GetConvMm2Deg() << endl; *fLog << " - DCA delta [deg] = " << fDCADelta << endl; } // -------------------------------------------------------------------------- // // This function is ment for special usage, please never try to set // values via this function // void MHillasSrc::Set(const TArrayF &arr) { if (arr.GetSize() != 5) return; fAlpha = arr.At(0); // [deg] angle of major axis with vector to src fDist = arr.At(1); // [mm] distance between src and center of ellipse fCosDeltaAlpha = arr.At(2); // [1] cosine of angle between d and a fDCA = arr.At(3); // [mm] fDCADelta = arr.At(4); // [mm] }