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