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Annotation of researchv10no/cmd/map/libmap/gall.c, revision 1.1.1.1

1.1       root        1: #include "map.h"
                      2: 
                      3: static double scale;
                      4: 
                      5: static int
                      6: Xgall(struct place *place, double *x, double *y)
                      7: {
                      8:        /* two ways to compute tan(place->nlat.l/2) */
                      9:        if(fabs(place->nlat.s)<.1)
                     10:                *y = sin(place->nlat.l/2)/cos(place->nlat.l/2);
                     11:        else
                     12:                *y = (1-place->nlat.c)/place->nlat.s;
                     13:        *x = -scale*place->wlon.l;
                     14:        return 1;
                     15: }
                     16: 
                     17: proj
                     18: gall(double par)
                     19: {
                     20:        double coshalf;
                     21:        if(fabs(par)>80)
                     22:                return 0;
                     23:        par *= RAD;
                     24:        coshalf = cos(par/2);
                     25:        scale = cos(par)/(2*coshalf*coshalf);
                     26:        return Xgall;
                     27: }

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