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Annotation of researchv10no/cmd/map/libmap/mercator.c, revision 1.1

1.1     ! root        1: #include "map.h"
        !             2: 
        !             3: static int
        !             4: Xmercator(struct place *place, double *x, double *y)
        !             5: {
        !             6:        if(fabs(place->nlat.l) > 80.*RAD)
        !             7:                return(-1);
        !             8:        *x = -place->wlon.l;
        !             9:        *y = 0.5*log((1+place->nlat.s)/(1-place->nlat.s));
        !            10:        return(1);
        !            11: }
        !            12: 
        !            13: proj
        !            14: mercator(void)
        !            15: {
        !            16:        return(Xmercator);
        !            17: }
        !            18: 
        !            19: static double ecc = ECC;
        !            20: 
        !            21: static int
        !            22: Xspmercator(struct place *place, double *x, double *y)
        !            23: {
        !            24:        if(Xmercator(place,x,y) < 0)
        !            25:                return(-1);
        !            26:        *y += 0.5*ecc*log((1-ecc*place->nlat.s)/(1+ecc*place->nlat.s));
        !            27:        return(1);
        !            28: }
        !            29: 
        !            30: proj
        !            31: sp_mercator(void)
        !            32: {
        !            33:        return(Xspmercator);
        !            34: }

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