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

1.1     ! root        1: #include "map.h"
        !             2: /* refractive fisheye, not logarithmic */
        !             3: 
        !             4: static double n;
        !             5: 
        !             6: static int
        !             7: Xfisheye(struct place *place, double *x, double *y)
        !             8: {
        !             9:        double r;
        !            10:        double u = sin(PI/4-place->nlat.l/2)/n;
        !            11:        if(fabs(u) > .97)
        !            12:                return -1;
        !            13:        r = tan(asin(u));
        !            14:        *x = -r*place->wlon.s;
        !            15:        *y = -r*place->wlon.c;
        !            16:        return 1;
        !            17: }
        !            18: 
        !            19: proj
        !            20: fisheye(double par)
        !            21: {
        !            22:        n = par;
        !            23:        return n<.1? 0: Xfisheye;
        !            24: }

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