1 | Bool_t HandleInput()
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2 | {
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3 | TTimer timer("gSystem->ProcessEvents();", 50, kFALSE);
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4 | while (1)
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5 | {
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6 | //
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7 | // While reading the input process gui events asynchronously
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8 | //
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9 | timer.TurnOn();
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10 | TString input = Getline("Type 'q' to exit, <return> to go on: ");
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11 | timer.TurnOff();
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12 |
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13 | if (input=="q\n")
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14 | return kFALSE;
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15 |
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16 | if (input=="\n")
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17 | return kTRUE;
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18 | };
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19 |
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20 | return kFALSE;
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21 | }
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22 |
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23 | void PropagateZ(TVector3 &p, TVector3 &w, double z, TArrow &arr)
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24 | {
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25 | arr.SetX1(p.X());
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26 | arr.SetY1(p.Z());
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27 |
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28 | p += (z-p.Z())/w.Z()*w;
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29 |
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30 | arr.SetX2(p.X());
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31 | arr.SetY2(p.Z());
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32 | }
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33 |
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34 | void PropagateDZ(TVector3 &p, TVector3 &w, double dz, TArrow &arr)
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35 | {
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36 | arr.SetX1(p.X());
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37 | arr.SetY1(p.Z());
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38 |
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39 | p += dz/w.Z()*w;
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40 |
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41 | arr.SetX2(p.X());
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42 | arr.SetY2(p.Z());
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43 | }
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44 |
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45 | void transition()
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46 | {
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47 | TH1C h("", "", 100, -2, 2);
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48 | h.SetMinimum(-1.5);
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49 | h.SetMaximum(1.5);
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50 | h.SetStats(kFALSE);
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51 | h.DrawCopy();
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52 |
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53 | TLine line;
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54 | line.DrawLine(-2, 0, 2, 0);
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55 |
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56 | TVector3 norm(0, 0, -1);
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57 | norm *= 1./norm.Mag();
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58 |
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59 | TArrow arr;
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60 | arr.SetArrowSize(0.01);
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61 | arr.DrawArrow(0, 0, 0+norm.X(), 0+norm.Z());
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62 |
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63 | TArrow arr_in(1, 1, 0, 0);
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64 | arr_in.SetArrowSize(0.01);
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65 | arr_in.SetLineColor(kBlue);
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66 | arr_in.Draw();
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67 |
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68 | TArrow arr_out(0, 0, 1, 1);
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69 | arr_out.SetArrowSize(0.01);
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70 | arr_out.SetLineColor(kRed);
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71 | arr_out.Draw();
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72 |
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73 | while (1)
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74 | {
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75 | double x, y;
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76 | gRandom->Circle(x, y, 1);
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77 |
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78 | TVector3 pos(x, 0, y);
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79 | TVector3 dir = -pos;
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80 |
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81 | arr_in.SetX1(-dir.X()*1.5);
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82 | arr_in.SetY1(-dir.Z()*1.5);
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83 |
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84 | double n1 = dir.Z()>0 ? 1.5 : 1; // where the ray comes from
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85 | double n2 = dir.Z()>0 ? 1 : 1.5; // where the ray goes to
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86 |
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87 | cout << sin(acos(dir*norm)) << endl;
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88 |
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89 | int rc = MOptics::ApplyTransition(dir, norm, n1, n2);
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90 |
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91 | cout << rc << endl;
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92 |
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93 | if (rc>=3) // Refraction
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94 | {
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95 | // Snell's law: n2*sin(theta2) = n1*sin(theta1) -- Is thge result correct?
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96 | cout << n2/n1*sin(acos(dir*norm)) << endl;
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97 | }
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98 |
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99 | arr_out.SetX2(dir.X()*1.5);
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100 | arr_out.SetY2(dir.Z()*1.5);
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101 |
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102 | gPad->Modified();
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103 | gPad->Update();
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104 |
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105 | if (!HandleInput())
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106 | break;
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107 | }
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108 | }
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