1 | /* ======================================================================== *\
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2 | !
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3 | ! *
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4 | ! * This file is part of CheObs, the Modular Analysis and Reconstruction
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5 | ! * Software. It is distributed to you in the hope that it can be a useful
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6 | ! * and timesaving tool in analysing Data of imaging Cerenkov telescopes.
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7 | ! * It is distributed WITHOUT ANY WARRANTY.
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8 | ! *
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9 | ! * Permission to use, copy, modify and distribute this software and its
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10 | ! * documentation for any purpose is hereby granted without fee,
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11 | ! * provided that the above copyright notice appears in all copies and
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12 | ! * that both that copyright notice and this permission notice appear
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13 | ! * in supporting documentation. It is provided "as is" without express
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14 | ! * or implied warranty.
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15 | ! *
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16 | !
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17 | !
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18 | ! Author(s): Thomas Bretz, 1/2009 <mailto:tbretz@astro.uni-wuerzburg.de>
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19 | !
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20 | ! Copyright: CheObs Software Development, 2000-2009
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21 | !
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22 | !
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23 | \* ======================================================================== */
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24 |
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25 | //////////////////////////////////////////////////////////////////////////////
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26 | //
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27 | // MMirror
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28 | //
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29 | // A square type spherical mirror
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30 | //
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31 | //////////////////////////////////////////////////////////////////////////////
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32 | #include "MMirrorSquare.h"
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33 |
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34 | #include <stdlib.h> // atof (Ubuntu 8.10)
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35 |
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36 | #include <TMath.h>
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37 | #include <TObjArray.h>
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38 |
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39 | #include <TBox.h>
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40 | #include <TEllipse.h>
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41 | #include <TVirtualPad.h>
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42 |
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43 | #include "MLog.h"
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44 |
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45 | #include "MQuaternion.h"
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46 |
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47 | ClassImp(MMirrorSquare);
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48 |
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49 | using namespace std;
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50 |
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51 | // --------------------------------------------------------------------------
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52 | //
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53 | // Return the max radius, i.e. the distance of the edges to zje center
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54 | //
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55 | Double_t MMirrorSquare::GetMaxR() const
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56 | {
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57 | return TMath::Sqrt(2.)*fSideLength;
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58 | }
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59 |
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60 | // --------------------------------------------------------------------------
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61 | //
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62 | // Return the aread of the square: l^2
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63 | //
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64 | Double_t MMirrorSquare::GetA() const
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65 | {
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66 | return fSideLength*fSideLength*4;
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67 | }
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68 |
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69 | // ------------------------------------------------------------------------
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70 | //
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71 | // This is a very rough estimate of whether a photon at a position p
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72 | // can hit a mirror. The position might be off in z and the photon
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73 | // still has to follow its trajectory. Nevertheless we can fairly assume
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74 | // the the way to travel in x/y is pretty small so we can give a rather
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75 | // good estimate of whether the photon can hit.
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76 | //
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77 | // never throw away a photon whihc can hit the mirror!
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78 | //
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79 | Bool_t MMirrorSquare::CanHit(const MQuaternion &p) const
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80 | {
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81 | // p is given in the reflectors coordinate frame. This is meant
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82 | // to be a fast check to sort out all mirrors which we can omit
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83 | // without time consuming calculations.
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84 |
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85 | // Check if this mirror can be hit at all
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86 | const Double_t dx = TMath::Abs(p.X()-X());
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87 | if (dx>fSideLength*1.05)
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88 | return kFALSE;
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89 |
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90 | const Double_t dy = TMath::Abs(p.Y()-Y());
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91 | if (dy>fSideLength*1.05)
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92 | return kFALSE;
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93 |
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94 | return kTRUE;
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95 | }
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96 |
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97 | // ------------------------------------------------------------------------
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98 | //
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99 | // Check if the given position coincides with the mirror. The position
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100 | // is assumed to be the incident point on the mirror's surface.
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101 | //
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102 | // The coordinates are in the mirrors coordinate frame.
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103 | //
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104 | // The action should coincide with what is painted in Paint()
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105 | //
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106 | Bool_t MMirrorSquare::HasHit(const MQuaternion &p) const
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107 | {
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108 | // p is the incident point in the mirror in the mirror's
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109 | // coordinate frame
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110 |
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111 | // Black spot in the mirror center (here we can fairly ignore
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112 | // the distance from the plane to the mirror surface, as long
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113 | // as the black spot does not become too large)
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114 | if (p.R2()<0.5*0.5)
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115 | return kFALSE;
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116 |
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117 | // Check if the photon has really hit the square mirror
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118 | if (TMath::Max(fabs(p.X()), fabs(p.Y()))>fSideLength)
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119 | return kFALSE;
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120 |
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121 | return kTRUE;
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122 | }
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123 |
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124 | // ------------------------------------------------------------------------
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125 | //
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126 | // Paint the mirror in x/y.
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127 | //
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128 | // The graphic should coincide with the action in HasHit
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129 | //
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130 | void MMirrorSquare::Paint(Option_t *opt)
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131 | {
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132 | TBox b;
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133 | TEllipse e;
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134 | b.SetFillColor(18);
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135 |
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136 | if (!TString(opt).Contains("line", TString::kIgnoreCase))
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137 | {
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138 | b.SetFillColor(17);
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139 | b.SetLineStyle(0);
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140 | e.SetLineStyle(0);
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141 | e.SetFillColor(gPad->GetFillColor());
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142 | }
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143 |
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144 | if (TString(opt).Contains("same", TString::kIgnoreCase))
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145 | {
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146 | b.SetFillStyle(0);
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147 | e.SetFillStyle(0);
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148 | }
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149 |
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150 | b.PaintBox(X()-fSideLength, Y()-fSideLength, X()+fSideLength, Y()+fSideLength);
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151 |
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152 | if (!TString(opt).Contains("border", TString::kIgnoreCase))
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153 | e.PaintEllipse(X(), Y(), 0.5, 0.5, 0, 360, 0);
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154 | }
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155 |
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156 | // ------------------------------------------------------------------------
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157 | //
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158 | // Print the contents of the mirror
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159 | //
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160 | void MMirrorSquare::Print(Option_t *o) const
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161 | {
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162 | MMirror::Print(o);
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163 | gLog << " " << fSideLength << endl;
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164 | }
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165 |
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166 | // ------------------------------------------------------------------------
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167 | //
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168 | // Read the mirror's setup from a file. The first eight tokens should be
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169 | // ignored. (This could be fixed!)
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170 | //
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171 | // Here we read: L
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172 | //
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173 | Int_t MMirrorSquare::ReadM(const TObjArray &tok)
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174 | {
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175 | if (tok.GetEntries()!=1)
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176 | return -1;
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177 |
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178 | Double_t l = atof(tok[0]->GetName());
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179 |
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180 | if (l<=0)
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181 | return -1;
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182 |
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183 | fSideLength = l/2;
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184 |
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185 | return 1;
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186 | }
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