diff options
Diffstat (limited to 'src/cmd/map/libmap/bicentric.c')
-rw-r--r-- | src/cmd/map/libmap/bicentric.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/cmd/map/libmap/bicentric.c b/src/cmd/map/libmap/bicentric.c new file mode 100644 index 00000000..33fd8d19 --- /dev/null +++ b/src/cmd/map/libmap/bicentric.c @@ -0,0 +1,25 @@ +#include <u.h> +#include <libc.h> +#include "map.h" + +static struct coord center; + +static int +Xbicentric(struct place *place, double *x, double *y) +{ + if(place->wlon.c<=.01||place->nlat.c<=.01) + return(-1); + *x = -center.c*place->wlon.s/place->wlon.c; + *y = place->nlat.s/(place->nlat.c*place->wlon.c); + return(*x**x+*y**y<=9); +} + +proj +bicentric(double l) +{ + l = fabs(l); + if(l>89) + return(0); + deg2rad(l,¢er); + return(Xbicentric); +} |