ref: 471274ead7d0d41c9540b7f9e05ed015cd178b9b
dir: /sys/src/cmd/map/libmap/azequalarea.c/
#include <u.h> #include <libc.h> #include "map.h" int Xazequalarea(struct place *place, double *x, double *y) { double r; r = sqrt(1. - place->nlat.s); *x = - r * place->wlon.s; *y = - r * place->wlon.c; return(1); } proj azequalarea(void) { return(Xazequalarea); }