1 | #include <iostream> |
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2 | #include <sstream> |
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3 | #include <iomanip> |
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4 | #include <string> |
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5 | #include <math.h> |
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6 | #include <Utils/utils.hh> |
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7 | |
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8 | using std::setw; |
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9 | using std::setfill; |
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10 | using std::setprecision; |
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11 | |
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12 | string getIAUNameEQ(double ra, double dec, float equinox) |
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13 | { |
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14 | /** |
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15 | * string getIAUNameEQ(double, double, float) |
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16 | * both ra and dec are assumed to be in degrees. |
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17 | * returns name of the form J1234-4321 for equinox = 2000, |
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18 | * and B1234-4321 otherwise |
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19 | */ |
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20 | |
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21 | double raHrs = ra / 15.; |
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22 | int h = int(raHrs); |
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23 | int m = (int)(fmod(raHrs,1.)*60.); |
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24 | std::stringstream ss(std::stringstream::out); |
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25 | ss.setf(std::ios::showpoint); |
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26 | ss.setf(std::ios::fixed); |
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27 | if(equinox==2000.) ss << "J"; |
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28 | else ss << "B"; |
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29 | ss<<setw(2)<<setfill('0')<<h; |
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30 | ss<<setw(2)<<setfill('0')<<m; |
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31 | int sign = int( dec / fabs(dec) ); |
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32 | double d = dec / sign; |
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33 | h = int(d); |
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34 | m = (int)(fmod(d,1.)*60.); |
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35 | if(sign==1) ss<<"+"; else ss<<"-"; |
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36 | ss<<setw(2)<<setfill('0')<<h; |
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37 | ss.unsetf(std::ios::showpos); |
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38 | ss<<setw(2)<<setfill('0')<<m; |
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39 | return ss.str(); |
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40 | } |
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41 | |
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42 | string getIAUNameGAL(double lon, double lat) |
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43 | { |
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44 | /** |
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45 | * string getIAUNameGAL(double, double) |
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46 | * both ra and dec are assumed to be in degrees. |
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47 | * returns name of the form G321.12+01.23 |
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48 | */ |
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49 | |
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50 | std::stringstream ss(std::stringstream::out); |
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51 | ss.setf(std::ios::showpoint); |
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52 | ss.setf(std::ios::fixed); |
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53 | ss<<"G"; |
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54 | ss<<setw(6)<<setfill('0')<<setprecision(2)<<lon; |
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55 | ss.setf(std::ios::showpos); |
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56 | ss.setf(std::ios::internal); |
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57 | ss<<setw(6)<<setfill('0')<<setprecision(2)<<lat; |
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58 | ss.unsetf(std::ios::internal); |
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59 | ss.unsetf(std::ios::showpos); |
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60 | ss.unsetf(std::ios::showpoint); |
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61 | ss.unsetf(std::ios::fixed); |
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62 | return ss.str(); |
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63 | } |
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64 | |
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65 | string decToDMS(const double dec, const string type) |
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66 | { |
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67 | /** |
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68 | * string decToDMS(double, string) |
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69 | * converts a decimal angle (in degrees) to a format reflecting the axis type: |
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70 | * RA (right ascension) --> hh:mm:ss.ss, with dec made modulo 360. (or 24hrs) |
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71 | * DEC (declination) --> sdd:mm:ss.ss (with sign, either + or -) |
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72 | * GLON (galactic longitude) --> ddd:mm:ss.ss, with dec made modulo 360. |
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73 | * GLAT (galactic latitude) --> sdd:mm:ss.ss (with sign, either + or -) |
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74 | * Any other type defaults to RA, and prints warning. |
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75 | */ |
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76 | |
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77 | double dec_abs,sec; |
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78 | int deg,min; |
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79 | const double onemin=1./60.; |
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80 | double thisDec = dec; |
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81 | string sign=""; |
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82 | int degSize = 2; // number of figures in the degrees part of the output. |
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83 | |
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84 | if((type=="RA")||(type=="GLON")){ |
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85 | if(type=="GLON") degSize = 3; // three figures in degrees when doing longitude. |
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86 | // Make these modulo 360.; |
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87 | while (thisDec < 0.) { thisDec += 360.; } |
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88 | while (thisDec >= 360.) { thisDec -= 360.; } |
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89 | if(type=="RA") thisDec /= 15.; // Convert to hours. |
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90 | } |
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91 | else if((type=="DEC")||(type=="GLAT")){ |
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92 | if(thisDec<0.) sign = "-"; |
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93 | else sign = "+"; |
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94 | } |
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95 | else { // UNKNOWN TYPE -- DEFAULT TO RA. |
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96 | std::cerr << "decToDMS:: Warning! Unknown axis type (" << type << "). Defaulting to using RA\n"; |
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97 | while (thisDec < 0.) { thisDec += 360.; } |
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98 | while (thisDec >= 360.) { thisDec -= 360.; } |
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99 | thisDec /= 15.; |
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100 | } |
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101 | |
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102 | dec_abs = fabs(thisDec); |
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103 | deg = int(dec_abs);//floor(d) |
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104 | min = (int)(fmod(dec_abs,1.)*60.); |
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105 | sec = fmod(dec_abs,onemin)*3600.; |
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106 | if(fabs(sec-60.)<1.e-10){ /* to prevent rounding errors stuffing things up*/ |
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107 | sec=0.; |
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108 | min++; |
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109 | } |
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110 | std::stringstream ss(std::stringstream::out); |
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111 | ss.setf(std::ios::showpoint); |
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112 | ss.setf(std::ios::fixed); |
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113 | ss << sign; |
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114 | ss << setw(degSize)<<setfill('0')<<deg<<":"; |
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115 | ss<<setw(2)<<setfill('0')<<min<<":"; |
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116 | ss<<setw(5)<<setprecision(2)<<sec; |
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117 | return ss.str(); |
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118 | } |
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119 | |
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120 | |
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121 | double dmsToDec(string dms) |
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122 | { |
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123 | /** |
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124 | * double dmsToDec(string) |
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125 | * Converts a string in the format +12:23:34.45 to a decimal angle in degrees. |
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126 | * Assumes the angle given is in degrees, so if passing RA as the argument, |
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127 | * need to multiply by 15 to get the result in degrees rather than hours. |
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128 | * The sign of the angle is preserved, if present. |
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129 | */ |
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130 | |
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131 | |
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132 | bool isNeg = false; |
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133 | if(dms[0]=='-') isNeg = true; |
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134 | |
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135 | std::stringstream ss; |
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136 | ss.str(dms); |
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137 | string deg,min,sec; |
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138 | getline(ss,deg,':'); |
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139 | getline(ss,min,':'); |
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140 | getline(ss,sec); |
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141 | char *end; |
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142 | double d = strtod(deg.c_str(),&end); |
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143 | double m = strtod(min.c_str(),&end); |
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144 | double s = strtod(sec.c_str(),&end); |
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145 | |
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146 | double dec = fabs(d) + m/60. + s/3600.; |
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147 | if(isNeg) dec = dec * -1.; |
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148 | |
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149 | return dec; |
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150 | |
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151 | } |
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152 | |
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153 | double angularSeparation(double &ra1, double &dec1, double &ra2, double &dec2) |
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154 | { |
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155 | /** |
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156 | * double angularSeparation(double &,double &,double &,double &); |
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157 | * Enter ra & dec for two positions. |
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158 | * (all positions in degrees) |
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159 | * Returns the angular separation in degrees. |
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160 | */ |
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161 | |
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162 | double angsep = cos((ra1-ra2)*M_PI/180.)*cos(dec1*M_PI/180.)*cos(dec2*M_PI/180.) |
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163 | + sin(dec1*M_PI/180.)*sin(dec2*M_PI/180.); |
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164 | angsep = acos(angsep)*180./M_PI; |
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165 | |
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166 | return angsep; |
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167 | |
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168 | } |
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