1 #include <u.h> 2 #include <libc.h> 3 #include "map.h" 4 5 6 int Xorthographic(struct place * place,double * x,double * y)7Xorthographic(struct place *place, double *x, double *y) 8 { 9 *x = - place->nlat.c * place->wlon.s; 10 *y = - place->nlat.c * place->wlon.c; 11 return(place->nlat.l<0.? 0 : 1); 12 } 13 14 proj orthographic(void)15orthographic(void) 16 { 17 return(Xorthographic); 18 } 19 20 int olimb(double * lat,double * lon,double res)21olimb(double *lat, double *lon, double res) 22 { 23 static first = 1; 24 if(first) { 25 *lat = 0; 26 *lon = -180; 27 first = 0; 28 return 0; 29 } 30 *lon += res; 31 if(*lon <= 180) 32 return 1; 33 first = 1; 34 return -1; 35 } 36