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Annotation of researchv10no/cmd/map/libmap/fisheye.c, revision 1.1.1.1

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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