/Proj4/PJ_eck1.c

http://github.com/route-me/route-me · C · 22 lines · 22 code · 0 blank · 0 comment · 1 complexity · c119af5d0afd50a5669adb45846141ad MD5 · raw file 

    

  1. #ifndef lint
    2. 

  2. static const char SCCSID[]="@(#)PJ_eck1.c	4.1 94/02/15     GIE     REL";
    3. 

  3. #endif
    4. 

  4. #define PJ_LIB__
    5. 

  5. #include	"projects.h"
    6. 

  6. PROJ_HEAD(eck1, "Eckert I") "\n\tPCyl., Sph.";
    7. 

  7. #define FC	.92131773192356127802
    8. 

  8. #define RP	.31830988618379067154
    9. 

  9. FORWARD(s_forward); /* spheroid */
    10. 

  10. 	xy.x = FC * lp.lam * (1. - RP * fabs(lp.phi));
    11. 

  11. 	xy.y = FC * lp.phi;
    12. 

  12. 	return (xy);
    13. 

  13. }
    14. 

  14. INVERSE(s_inverse); /* spheroid */
    15. 

  15. 	lp.phi = xy.y / FC;
    16. 

  16. 	lp.lam = xy.x / (FC * (1. - RP * fabs(lp.phi)));
    17. 

  17. 	return (lp);
    18. 

  18. }
    19. 

  19. FREEUP; if (P) pj_dalloc(P); }
    20. 

  20. ENTRY0(eck1)
    21. 

  21. 	P->es = 0.; P->inv = s_inverse; P->fwd = s_forward;
    22. 

  22. ENDENTRY(P)
    23.