/Proj4/PJ_gall.c

http://github.com/route-me/route-me · C · 22 lines · 22 code · 0 blank · 0 comment · 1 complexity · c022048ee30f40741175cf333be6649a MD5 · raw file 

    

  1. #ifndef lint
    2. 

  2. static const char SCCSID[]="@(#)PJ_gall.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(gall, "Gall (Gall Stereographic)") "\n\tCyl, Sph";
    7. 

  7. #define YF	1.70710678118654752440
    8. 

  8. #define XF	0.70710678118654752440
    9. 

  9. #define RYF	0.58578643762690495119
    10. 

  10. #define RXF	1.41421356237309504880
    11. 

  11. FORWARD(s_forward); /* spheroid */
    12. 

  12. 	xy.x = XF * lp.lam;
    13. 

  13. 	xy.y = YF * tan(.5 * lp.phi);
    14. 

  14. 	return (xy);
    15. 

  15. }
    16. 

  16. INVERSE(s_inverse); /* spheroid */
    17. 

  17. 	lp.lam = RXF * xy.x;
    18. 

  18. 	lp.phi = 2. * atan(xy.y * RYF);
    19. 

  19. 	return (lp);
    20. 

  20. }
    21. 

  21. FREEUP; if (P) pj_dalloc(P); }
    22. 

  22. ENTRY0(gall) P->es = 0.; P->inv = s_inverse; P->fwd = s_forward; ENDENTRY(P)
    23.