1 | #include <iostream> |
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2 | #include <sstream> |
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3 | #include <math.h> |
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4 | #include <wcs.h> |
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5 | #include <wcsunits.h> |
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6 | #include <duchamp.hh> |
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7 | #include <Utils/utils.hh> |
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8 | |
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9 | int pixToWCSSingle(struct wcsprm *wcs, const double *pix, double *world) |
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10 | { |
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11 | /** |
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12 | * pixToWCSSingle(struct wcsprm *wcs, const double *pix, double *world) |
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13 | * Uses wcs to convert the three-dimensional pixel position referenced |
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14 | * by pix to world coordinates, which are placed in the array world[]. |
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15 | * Assumes that pix only has one point with an x,y,and z pixel positions. |
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16 | * If there are any other axes present (eg. Stokes), these are set to the |
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17 | * first pixel in that axis. |
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18 | * Offsets these pixel values by 1 to account for the C arrays being |
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19 | * indexed to 0. |
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20 | */ |
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21 | |
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22 | int naxis=wcs->naxis,npts=1,status; |
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23 | |
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24 | double *newpix = new double[naxis*npts]; |
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25 | // correct from 0-indexed to 1-indexed pixel array |
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26 | for(int i=0;i<naxis;i++) newpix[i] = 1.; |
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27 | newpix[wcs->lng] += pix[0]; |
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28 | newpix[wcs->lat] += pix[1]; |
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29 | newpix[wcs->spec]+= pix[2]; |
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30 | |
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31 | int *stat = new int[npts]; |
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32 | double *imgcrd = new double[naxis*npts]; |
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33 | double *tempworld = new double[naxis*npts]; |
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34 | double *phi = new double[npts]; |
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35 | double *theta = new double[npts]; |
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36 | if(status=wcsp2s(wcs, npts, naxis, newpix, imgcrd, phi, |
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37 | theta, tempworld, stat)>0){ |
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38 | std::stringstream errmsg; |
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39 | errmsg << "WCS Error Code = " << status <<": " << wcs_errmsg[status] |
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40 | << "\nstat value is " << stat[0] << std::endl; |
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41 | duchampError("pixToWCSSingle",errmsg.str()); |
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42 | } |
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43 | |
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44 | //return just the spatial/velocity information |
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45 | world[0] = tempworld[wcs->lng]; |
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46 | world[1] = tempworld[wcs->lat]; |
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47 | world[2] = tempworld[wcs->spec]; |
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48 | |
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49 | delete [] stat; |
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50 | delete [] imgcrd; |
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51 | delete [] tempworld; |
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52 | delete [] phi; |
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53 | delete [] theta; |
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54 | delete [] newpix; |
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55 | return status; |
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56 | } |
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57 | |
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58 | int wcsToPixSingle(struct wcsprm *wcs, const double *world, double *pix) |
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59 | { |
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60 | /** |
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61 | * wcsToPixSingle(struct wcsprm *wcs, const double *world, double *pix) |
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62 | * Uses wcs to convert the three-dimensional world coordinate position |
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63 | * referenced by world to pixel coordinates, which are placed in the |
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64 | * array pix[]. |
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65 | * Assumes that world only has one point (three values eg RA Dec Velocity) |
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66 | * Offsets the pixel values by 1 to account for the C arrays being |
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67 | * indexed to 0. |
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68 | */ |
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69 | |
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70 | int naxis=wcs->naxis,npts=1,status; |
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71 | |
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72 | double *tempworld = new double[naxis*npts]; |
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73 | for(int i=0;i<naxis;i++) tempworld[i] = wcs->crval[i]; |
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74 | tempworld[wcs->lng] = world[0]; |
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75 | tempworld[wcs->lat] = world[1]; |
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76 | tempworld[wcs->spec] = world[2]; |
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77 | |
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78 | int *stat = new int[npts]; |
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79 | double *temppix = new double[naxis*npts]; |
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80 | double *imgcrd = new double[naxis*npts]; |
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81 | double *phi = new double[npts]; |
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82 | double *theta = new double[npts]; |
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83 | |
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84 | status=wcss2p(wcs, npts, naxis, tempworld, phi, theta, imgcrd, temppix, stat); |
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85 | |
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86 | if( status > 0 ){ |
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87 | std::stringstream errmsg; |
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88 | errmsg << "WCS Error Code = " <<status<<": " << wcs_errmsg[status] |
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89 | << "\nstat value is " << stat[0] << std::endl; |
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90 | duchampError("wcsToPixSingle",errmsg.str()); |
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91 | } |
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92 | |
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93 | pix[0] = temppix[wcs->lng] - 1.; |
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94 | pix[1] = temppix[wcs->lat] - 1.; |
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95 | pix[2] = temppix[wcs->spec] - 1.; |
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96 | // correct from 1-indexed to 0-indexed pixel array |
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97 | // and only return the spatial & frequency information |
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98 | |
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99 | delete [] stat; |
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100 | delete [] imgcrd; |
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101 | delete [] temppix; |
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102 | delete [] phi; |
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103 | delete [] theta; |
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104 | delete [] tempworld; |
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105 | return status; |
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106 | } |
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107 | |
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108 | int pixToWCSMulti(struct wcsprm *wcs, const double *pix, double *world, const int npts) |
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109 | { |
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110 | /** |
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111 | * pixToWCSSingle(struct wcsprm *wcs, const double *pix, double *world) |
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112 | * Uses wcs to convert the three-dimensional pixel positions referenced |
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113 | * by pix to world coordinates, which are placed in the array world[]. |
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114 | * pix is assumed to hold the positions of npts points. |
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115 | * Offsets these pixel values by 1 to account for the C arrays being |
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116 | * indexed to 0. |
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117 | */ |
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118 | |
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119 | int naxis=wcs->naxis,status; |
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120 | |
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121 | // correct from 0-indexed to 1-indexed pixel array |
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122 | // Add entries for any other axes that are present, keeping the |
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123 | // order of pixel positions the same |
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124 | double *newpix = new double[naxis*npts]; |
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125 | for(int pt=0;pt<npts;pt++){ |
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126 | for(int i=0;i<naxis;i++) newpix[pt*naxis+i] = 1.; |
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127 | newpix[pt*naxis+wcs->lng] += pix[pt*3+0]; |
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128 | newpix[pt*naxis+wcs->lat] += pix[pt*3+1]; |
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129 | newpix[pt*naxis+wcs->spec] += pix[pt*3+2]; |
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130 | } |
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131 | |
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132 | int *stat = new int[npts]; |
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133 | double *imgcrd = new double[naxis*npts]; |
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134 | double *tempworld = new double[naxis*npts]; |
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135 | double *phi = new double[npts]; |
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136 | double *theta = new double[npts]; |
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137 | |
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138 | if(status=wcsp2s(wcs, npts, naxis, newpix, imgcrd, |
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139 | phi, theta, tempworld, stat) >0){ |
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140 | std::stringstream errmsg; |
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141 | errmsg << "WCS Error Code = " <<status<<": " << wcs_errmsg[status] |
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142 | << "\nstat value is " << stat[0] << std::endl; |
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143 | duchampError("pixToWCSMulti",errmsg.str()); |
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144 | } |
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145 | else{ |
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146 | //return just the spatial/velocity information, keeping the |
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147 | // order of the pixel positions the same. |
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148 | for(int pt=0;pt<npts;pt++){ |
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149 | world[pt*3+0] = tempworld[pt*naxis + wcs->lng]; |
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150 | world[pt*3+1] = tempworld[pt*naxis + wcs->lat]; |
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151 | world[pt*3+2] = tempworld[pt*naxis + wcs->spec]; |
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152 | } |
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153 | |
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154 | } |
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155 | |
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156 | delete [] stat; |
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157 | delete [] imgcrd; |
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158 | delete [] tempworld; |
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159 | delete [] phi; |
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160 | delete [] theta; |
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161 | delete [] newpix; |
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162 | return status; |
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163 | } |
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164 | |
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165 | int wcsToPixMulti(struct wcsprm *wcs, const double *world, double *pix, const int npts) |
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166 | { |
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167 | /** |
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168 | * wcsToPixSingle(struct wcsprm *wcs, const double *world, double *pix) |
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169 | * Uses wcs to convert the three-dimensional world coordinate position |
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170 | * referenced by world to pixel coordinates, which are placed in the |
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171 | * array pix[]. |
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172 | * world is assumed to hold the positions of npts points. |
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173 | * Offsets the pixel values by 1 to account for the C arrays being |
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174 | * indexed to 0. |
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175 | */ |
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176 | |
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177 | int naxis=wcs->naxis,status=0; |
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178 | // Test to see if there are other axes present, eg. stokes |
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179 | if(wcs->naxis>naxis) naxis = wcs->naxis; |
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180 | |
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181 | // Add entries for any other axes that are present, keeping the |
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182 | // order of pixel positions the same |
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183 | double *tempworld = new double[naxis*npts]; |
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184 | for(int pt=0;pt<npts;pt++){ |
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185 | for(int axis=0;axis<naxis;axis++) |
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186 | tempworld[pt*naxis+axis] = wcs->crval[axis]; |
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187 | tempworld[pt*naxis + wcs->lng] = world[pt*3+0]; |
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188 | tempworld[pt*naxis + wcs->lat] = world[pt*3+1]; |
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189 | tempworld[pt*naxis + wcs->spec] = world[pt*3+2]; |
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190 | } |
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191 | |
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192 | int *stat = new int[npts]; |
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193 | double *temppix = new double[naxis*npts]; |
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194 | double *imgcrd = new double[naxis*npts]; |
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195 | double *phi = new double[npts]; |
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196 | double *theta = new double[npts]; |
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197 | if(status=wcss2p(wcs, npts, naxis, tempworld, |
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198 | phi, theta, imgcrd, temppix, stat)>0){ |
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199 | std::stringstream errmsg; |
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200 | errmsg << "WCS Error Code = " <<status<<": " <<wcs_errmsg[status] |
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201 | << "\nstat value is " << stat[0] << std::endl; |
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202 | duchampError("wcsToPixMulti",errmsg.str()); |
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203 | } |
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204 | else{ |
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205 | // correct from 1-indexed to 0-indexed pixel array |
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206 | // and return just the spatial/velocity information, |
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207 | // keeping the order of the pixel positions the same. |
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208 | for(int pt=0;pt<npts;pt++){ |
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209 | pix[pt*naxis + 0] = temppix[pt*naxis + wcs->lng] - 1.; |
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210 | pix[pt*naxis + 1] = temppix[pt*naxis + wcs->lat] - 1.; |
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211 | pix[pt*naxis + 2] = temppix[pt*naxis + wcs->spec] - 1.; |
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212 | } |
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213 | } |
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214 | |
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215 | delete [] stat; |
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216 | delete [] imgcrd; |
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217 | delete [] temppix; |
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218 | delete [] phi; |
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219 | delete [] theta; |
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220 | delete [] tempworld; |
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221 | return status; |
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222 | } |
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223 | |
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224 | double pixelToVelocity(struct wcsprm *wcs, double &x, double &y, double &z, |
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225 | string velUnits) |
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226 | { |
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227 | /** |
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228 | * pixelToVelocity(struct wcsprm *wcs, double &x, double &y, double &z, |
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229 | * string velUnits) |
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230 | * Uses wcs to convert the three-dimensional pixel position (x,y,z) |
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231 | * to world coordinates. |
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232 | * Returns the velocity in the units given by velUnits. |
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233 | */ |
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234 | |
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235 | int naxis=wcs->naxis,status=0; |
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236 | int *stat = new int[1]; |
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237 | double *pixcrd = new double[naxis]; |
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238 | double *imgcrd = new double[naxis]; |
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239 | double *world = new double[naxis]; |
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240 | double *phi = new double[1]; |
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241 | double *theta = new double[1]; |
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242 | // correct from 0-indexed to 1-indexed pixel array by adding 1 to pixel values. |
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243 | for(int i=0;i<naxis;i++) pixcrd[i] = 1.; |
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244 | pixcrd[wcs->lng] += x; |
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245 | pixcrd[wcs->lat] += y; |
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246 | pixcrd[wcs->spec]+= z; |
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247 | |
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248 | if(status=wcsp2s(wcs, 1, naxis, pixcrd, imgcrd, phi, theta, world, stat)>0){ |
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249 | std::stringstream errmsg; |
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250 | errmsg <<"WCS Error Code = "<<status<<": "<<wcs_errmsg[status] |
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251 | << "\nstat value is "<<stat[0]<<std::endl; |
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252 | duchampError("pixelToVelocity",errmsg.str()); |
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253 | } |
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254 | |
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255 | double vel = coordToVel(wcs, world[wcs->spec], velUnits); |
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256 | |
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257 | delete [] stat; |
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258 | delete [] pixcrd; |
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259 | delete [] imgcrd; |
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260 | delete [] world; |
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261 | delete [] phi; |
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262 | delete [] theta; |
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263 | |
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264 | return vel; |
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265 | } |
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266 | |
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267 | double coordToVel(struct wcsprm *wcs, const double coord, string outputUnits) |
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268 | { |
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269 | /** |
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270 | * coordToVel(struct wcsprm *wcs, const double coord, string outputUnits) |
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271 | * Convert the wcs coordinate given by coord to a velocity in km/s. |
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272 | * Does this by checking the ztype parameter in wcs to see if it is |
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273 | * FREQ or otherwise, and converts accordingly. |
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274 | */ |
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275 | |
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276 | static int errflag = 0; |
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277 | double scale, offset, power; |
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278 | int specIndex = wcs->spec; |
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279 | int status = wcsunits( wcs->cunit[specIndex], outputUnits.c_str(), |
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280 | &scale, &offset, &power); |
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281 | |
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282 | if(status > 0){ |
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283 | if(errflag==0){ |
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284 | std::stringstream errmsg; |
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285 | errmsg << "WCSUNITS Error Code = " << status << ":" |
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286 | << wcsunits_errmsg[status]; |
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287 | if(status == 10) errmsg << "\nTried to get conversion from " |
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288 | << wcs->cunit[specIndex] |
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289 | << " to " << outputUnits.c_str(); |
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290 | errmsg << "\nUsing coordinate value instead.\n"; |
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291 | duchampError("coordToVel", errmsg.str()); |
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292 | errflag = 1; |
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293 | } |
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294 | return coord; |
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295 | } |
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296 | else return pow( (coord*scale + offset), power); |
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297 | |
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298 | } |
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299 | |
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300 | double velToCoord(struct wcsprm *wcs, const float velocity, string outputUnits) |
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301 | { |
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302 | /** |
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303 | * velToCoord(struct wcsprm *wcs, const double coord) |
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304 | * Convert the velocity given to the appropriate world coordinate for wcs. |
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305 | * Does this by checking the ztype parameter in wcs to see if it is |
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306 | * FREQ or otherwise, and converts accordingly. |
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307 | */ |
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308 | |
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309 | double scale, offset, power; |
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310 | int specIndex = wcs->spec; |
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311 | int status = wcsunits( wcs->cunit[specIndex], outputUnits.c_str(), |
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312 | &scale, &offset, &power); |
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313 | |
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314 | if(status > 0){ |
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315 | std::stringstream errmsg; |
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316 | errmsg << "WCSUNITS Error Code = " << status << ":" |
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317 | << wcsunits_errmsg[status] << "\nUsing coordinate value instead.\n"; |
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318 | duchampError("velToCoord",errmsg.str()); |
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319 | return velocity; |
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320 | } |
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321 | else return (pow(velocity, 1./power) - offset) / scale; |
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322 | |
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323 | } |
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