1 | #include <iostream> |
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2 | #include <wcs.h> |
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3 | #include <Utils/utils.hh> |
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4 | |
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5 | double pixelToVelocity(wcsprm *wcs, double &x, double &y, double &z) |
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6 | { |
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7 | /** |
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8 | * pixelToVelocity(wcsprm *wcs, double &x, double &y, double &z) |
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9 | * Uses wcs to convert the three-dimensional pixel position (x,y,z) |
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10 | * to world coordinates. |
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11 | * Returns the velocity. |
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12 | */ |
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13 | |
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14 | int *stat = new int[1]; |
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15 | double *pixcrd = new double[3]; |
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16 | double *imgcrd = new double[3]; |
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17 | double *world = new double[3]; |
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18 | double *phi = new double[1]; |
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19 | double *theta = new double[1]; |
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20 | // correct from 0-indexed to 1-indexed pixel array by adding 1 to pixel values. |
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21 | pixcrd[0] = x + 1; |
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22 | pixcrd[1] = y + 1; |
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23 | pixcrd[2] = z + 1; |
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24 | if(int flag=wcsp2s(wcs, 1, 3, pixcrd, imgcrd, phi, theta, world, stat)>0){ |
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25 | std::cerr<<"WCS Error in pixelToVelocity(): Code = "<<flag<<": "<<wcs_errmsg[flag]<<std::endl; |
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26 | std::cerr<<" stat value is "<<stat[0]<<std::endl; |
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27 | } |
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28 | |
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29 | double vel = setVel_kms(wcs, world[2]); |
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30 | |
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31 | delete [] stat; |
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32 | delete [] pixcrd; |
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33 | delete [] imgcrd; |
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34 | delete [] world; |
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35 | delete [] phi; |
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36 | delete [] theta; |
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37 | |
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38 | return vel; |
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39 | } |
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40 | |
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41 | |
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42 | int pixToWCSSingle(wcsprm *wcs, const double *pix, double *world) |
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43 | { |
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44 | /** |
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45 | * pixToWCSSingle(wcsprm *wcs, const double *pix, double *world) |
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46 | * Uses wcs to convert the three-dimensional pixel position referenced by pix |
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47 | * to world coordinates, which are placed in the array world[]. |
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48 | * Assumes that pix only has one point with an x,y,and z pixel positions. |
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49 | * Offsets these pixel values by 1 to account for the C arrays being indexed to 0. |
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50 | */ |
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51 | |
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52 | int nelem=3,npts=1,flag; |
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53 | |
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54 | double *newpix = new double[nelem*npts]; |
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55 | for(int i=0;i<nelem*npts;i++) newpix[i] = pix[i] + 1.; |
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56 | // correct from 0-indexed to 1-indexed pixel array |
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57 | |
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58 | int *stat = new int[npts]; |
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59 | double *imgcrd = new double[nelem*npts]; |
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60 | double *phi = new double[npts]; |
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61 | double *theta = new double[npts]; |
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62 | if(flag=wcsp2s(wcs, npts, nelem, newpix, imgcrd, phi, theta, world, stat)>0){ |
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63 | std::cerr << "WCS Error in pixToWCSSingle(): Code = " <<flag<<": "<<wcs_errmsg[flag]<<std::endl; |
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64 | std::cerr << " stat value is " << stat[0] << std::endl; |
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65 | } |
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66 | delete [] stat; |
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67 | delete [] imgcrd; |
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68 | delete [] phi; |
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69 | delete [] theta; |
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70 | return flag; |
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71 | } |
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72 | |
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73 | int wcsToPixSingle(wcsprm *wcs, const double *world, double *pix) |
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74 | { |
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75 | /** |
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76 | * wcsToPixSingle(wcsprm *wcs, const double *world, double *pix) |
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77 | * Uses wcs to convert the three-dimensional world coordinate position referenced by world |
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78 | * to pixel coordinates, which are placed in the array pix[]. |
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79 | * Assumes that world only has one point (three values eg. RA, Dec, Velocity) |
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80 | * Offsets the pixel values by 1 to account for the C arrays being indexed to 0. |
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81 | */ |
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82 | |
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83 | int nelem=3,npts=1,flag; |
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84 | int *stat = new int[npts]; |
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85 | double *imgcrd = new double[nelem*npts]; |
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86 | double *phi = new double[npts]; |
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87 | double *theta = new double[npts]; |
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88 | if(flag=wcss2p(wcs, npts, nelem, world, phi, theta, imgcrd, pix, stat)>0){ |
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89 | std::cerr << "WCS Error in wcsToPixSingle(): Code = " <<flag<<": "<<wcs_errmsg[flag]<<std::endl; |
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90 | std::cerr << " stat value is " << stat[0] << std::endl; |
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91 | } |
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92 | |
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93 | for(int i=0;i<nelem;i++) pix[i] -= 1.; // correct from 1-indexed to 0-indexed pixel array |
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94 | |
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95 | delete [] stat; |
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96 | delete [] imgcrd; |
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97 | delete [] phi; |
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98 | delete [] theta; |
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99 | return flag; |
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100 | } |
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101 | |
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102 | int pixToWCSMulti(wcsprm *wcs, const double *pix, double *world, const int npts) |
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103 | { |
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104 | /** |
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105 | * pixToWCSSingle(wcsprm *wcs, const double *pix, double *world) |
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106 | * Uses wcs to convert the three-dimensional pixel positions referenced by pix |
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107 | * to world coordinates, which are placed in the array world[]. |
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108 | * pix is assumed to hold the positions of npts points. |
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109 | * Offsets these pixel values by 1 to account for the C arrays being indexed to 0. |
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110 | */ |
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111 | |
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112 | int nelem=3,flag; |
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113 | |
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114 | double *newpix = new double[nelem*npts]; |
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115 | for(int i=0;i<nelem*npts;i++) newpix[i] = pix[i] + 1.; |
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116 | // correct from 0-indexed to 1-indexed pixel array |
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117 | |
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118 | int *stat = new int[npts]; |
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119 | double *imgcrd = new double[nelem*npts]; |
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120 | double *phi = new double[npts]; |
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121 | double *theta = new double[npts]; |
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122 | if(flag=wcsp2s(wcs, npts, nelem, newpix, imgcrd, phi, theta, world, stat)>0){ |
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123 | std::cerr << "WCS Error in pixToWCSSingle(): Code = " <<flag<<": "<<wcs_errmsg[flag]<<std::endl; |
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124 | std::cerr << " stat value is " << stat[0] << std::endl; |
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125 | } |
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126 | delete [] stat; |
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127 | delete [] imgcrd; |
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128 | delete [] phi; |
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129 | delete [] theta; |
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130 | delete [] newpix; |
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131 | return flag; |
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132 | } |
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133 | |
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134 | int wcsToPixMulti(wcsprm *wcs, const double *world, double *pix, const int npts) |
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135 | { |
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136 | /** |
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137 | * wcsToPixSingle(wcsprm *wcs, const double *world, double *pix) |
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138 | * Uses wcs to convert the three-dimensional world coordinate position referenced by world |
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139 | * to pixel coordinates, which are placed in the array pix[]. |
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140 | * world is assumed to hold the positions of npts points. |
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141 | * Offsets the pixel values by 1 to account for the C arrays being indexed to 0. |
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142 | */ |
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143 | int nelem=3,flag; |
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144 | int *stat = new int[npts]; |
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145 | double *imgcrd = new double[nelem*npts]; |
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146 | double *phi = new double[npts]; |
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147 | double *theta = new double[npts]; |
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148 | if(flag=wcss2p(wcs, npts, nelem, world, phi, theta, imgcrd, pix, stat)>0){ |
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149 | std::cerr << "WCS Error in wcsToPixSingle(): Code = " <<flag<<": "<<wcs_errmsg[flag]<<std::endl; |
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150 | std::cerr << " stat value is " << stat[0] << std::endl; |
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151 | } |
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152 | |
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153 | for(int i=0;i<nelem;i++) pix[i] -= 1.; // correct from 1-indexed to 0-indexed pixel array |
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154 | |
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155 | delete [] stat; |
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156 | delete [] imgcrd; |
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157 | delete [] phi; |
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158 | delete [] theta; |
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159 | return flag; |
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160 | } |
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161 | |
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162 | float setVel_kms(wcsprm *wcs, const double coord) |
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163 | { |
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164 | /** |
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165 | * setVel_kms(wcsprm *wcs, const double coord) |
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166 | * Convert the wcs coordinate given by coord to a velocity in km/s. |
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167 | * Does this by checking the ztype parameter in wcs to see if it is FREQ or otherwise, |
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168 | * and converts accordingly. |
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169 | */ |
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170 | |
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171 | string ztype = wcs->ctype[2]; |
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172 | if(ztype!="FREQ") { |
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173 | return coord/1000.; |
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174 | } |
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175 | else{ |
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176 | return C_kms * (wcs->restfrq*wcs->restfrq - coord*coord) / (wcs->restfrq*wcs->restfrq + coord*coord); |
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177 | } |
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178 | } |
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179 | |
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180 | double velToCoord(wcsprm *wcs, const float velocity) |
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181 | { |
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182 | /** |
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183 | * velToCoord(wcsprm *wcs, const double coord) |
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184 | * Convert the velocity given to the appropriate world coordinate for wcs. |
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185 | * Does this by checking the ztype parameter in wcs to see if it is FREQ or otherwise, |
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186 | * and converts accordingly. |
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187 | */ |
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188 | |
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189 | string ztype = wcs->ctype[2]; |
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190 | if(ztype!="FREQ") |
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191 | return velocity * 1000.; |
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192 | else |
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193 | return wcs->restfrq * (1. - velocity/C_kms) / (1. + velocity/C_kms); |
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194 | |
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195 | } |
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