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

1.1     ! root        1: #include "map.h"
        !             2: 
        !             3: static int
        !             4: Xlagrange(struct place *place, double *x, double *y)
        !             5: {
        !             6:        double z1,z2;
        !             7:        double w1,w2,t1,t2;
        !             8:        struct place p;
        !             9:        copyplace(place,&p);
        !            10:        if(place->nlat.l<0) {
        !            11:                p.nlat.l = -p.nlat.l;
        !            12:                p.nlat.s = -p.nlat.s;
        !            13:        }
        !            14:        Xstereographic(&p,&z1,&z2);
        !            15:        csqrt(-z2/2,z1/2,&w1,&w2);
        !            16:        cdiv(w1-1,w2,w1+1,w2,&t1,&t2);
        !            17:        *y = -t1;
        !            18:        *x = t2;
        !            19:        if(place->nlat.l<0)
        !            20:                *y = -*y;
        !            21:        return(1);
        !            22: }
        !            23: 
        !            24: proj
        !            25: lagrange(void)
        !            26: {
        !            27:        return(Xlagrange);
        !            28: }

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