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Annotation of researchv8dc/cmd/map/libmap/mercator.c, revision 1.1

1.1     ! root        1: #include "map.h"
        !             2: #include <math.h>
        !             3: 
        !             4: static
        !             5: Xmercator(place,x,y)
        !             6: struct place *place;
        !             7: float *x, *y;
        !             8: {
        !             9:        if(fabs(place->nlat.l) > 80.*RAD)
        !            10:                return(-1);
        !            11:        *x = -place->wlon.l;
        !            12:        *y = 0.5*log((1+place->nlat.s)/(1-place->nlat.s));
        !            13:        return(1);
        !            14: }
        !            15: 
        !            16: int (*mercator())()
        !            17: {
        !            18:        return(Xmercator);
        !            19: }
        !            20: static float ecc = ECC;
        !            21: 
        !            22: static
        !            23: Xspmercator(place,x,y)
        !            24: struct place *place;
        !            25: float *x, *y;
        !            26: {
        !            27:        if(Xmercator(place,x,y) < 0)
        !            28:                return(-1);
        !            29:        *y += 0.5*ecc*log((1-ecc*place->nlat.s)/(1+ecc*place->nlat.s));
        !            30:        return(1);
        !            31: }
        !            32: 
        !            33: int (*sp_mercator())()
        !            34: {
        !            35:        return(Xspmercator);
        !            36: }

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