tazequalarea.c - plan9port - [fork] Plan 9 from user space
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       ---
       tazequalarea.c (274B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include "map.h"
            4 
            5 int
            6 Xazequalarea(struct place *place, double *x, double *y)
            7 {
            8         double r;
            9         r = sqrt(1. - place->nlat.s);
           10         *x = - r * place->wlon.s;
           11         *y = - r * place->wlon.c;
           12         return(1);
           13 }
           14 
           15 proj
           16 azequalarea(void)
           17 {
           18         return(Xazequalarea);
           19 }