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Annotation of researchv8dc/cmd/map/libmap/polyconic.c, revision 1.1.1.1

1.1       root        1: #include "map.h"
                      2: 
                      3: Xpolyconic(place, x, y)
                      4: struct place *place;
                      5: float *x, *y;
                      6: {
                      7:        double r, alpha;
                      8:        float lat2, lon2;
                      9:        if(fabs(place->nlat.l) > .01) {
                     10:                r = place->nlat.c / place->nlat.s;
                     11:                alpha = place->wlon.l * place->nlat.s;
                     12:                *y = place->nlat.l + r*(1 - cos(alpha));
                     13:                *x = - r*sin(alpha);
                     14:        } else {
                     15:                lon2 = place->wlon.l * place->wlon.l;
                     16:                lat2 = place->nlat.l * place->nlat.l;
                     17:                *y = place->nlat.l * (1+(lon2/2)*(1-(8+lon2)*lat2/12));
                     18:                *x = - place->wlon.l * (1-lat2*(3+lon2)/6);
                     19:        }
                     20:        return(1);
                     21: }
                     22: 
                     23: int (*polyconic())()
                     24: {
                     25:        return(Xpolyconic);
                     26: }

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