Return to polyconic.c CVS log

Up to [Research Unix] / researchv10no / cmd / map / libmap

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

1.1       root        1: #include "map.h"
                      2: 
                      3: int
                      4: Xpolyconic(struct place *place, double *x, double *y)
                      5: {
                      6:        double r, alpha;
                      7:        double lat2, lon2;
                      8:        if(fabs(place->nlat.l) > .01) {
                      9:                r = place->nlat.c / place->nlat.s;
                     10:                alpha = place->wlon.l * place->nlat.s;
                     11:                *y = place->nlat.l + r*(1 - cos(alpha));
                     12:                *x = - r*sin(alpha);
                     13:        } else {
                     14:                lon2 = place->wlon.l * place->wlon.l;
                     15:                lat2 = place->nlat.l * place->nlat.l;
                     16:                *y = place->nlat.l * (1+(lon2/2)*(1-(8+lon2)*lat2/12));
                     17:                *x = - place->wlon.l * (1-lat2*(3+lon2)/6);
                     18:        }
                     19:        return(1);
                     20: }
                     21: 
                     22: proj
                     23: polyconic(void)
                     24: {
                     25:        return(Xpolyconic);
                     26: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.