/Proj4/PJ_crast.c

http://github.com/route-me/route-me · C · 25 lines · 25 code · 0 blank · 0 comment · 1 complexity · 9fbcb4cc222e8e59cb56dd42427d581c MD5 · raw file 

    

  1. #ifndef lint
    2. 

  2. static const char SCCSID[]="@(#)PJ_crast.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(crast, "Craster Parabolic (Putnins P4)")
    7. 

  7. "\n\tPCyl., Sph.";
    8. 

  8. #define XM	0.97720502380583984317
    9. 

  9. #define RXM	1.02332670794648848847
    10. 

  10. #define YM	3.06998012383946546542
    11. 

  11. #define RYM	0.32573500793527994772
    12. 

  12. #define THIRD	0.333333333333333333
    13. 

  13. FORWARD(s_forward); /* spheroid */
    14. 

  14. 	lp.phi *= THIRD;
    15. 

  15. 	xy.x = XM * lp.lam * (2. * cos(lp.phi + lp.phi) - 1.);
    16. 

  16. 	xy.y = YM * sin(lp.phi);
    17. 

  17. 	return (xy);
    18. 

  18. }
    19. 

  19. INVERSE(s_inverse); /* spheroid */
    20. 

  20. 	lp.phi = 3. * asin(xy.y * RYM);
    21. 

  21. 	lp.lam = xy.x * RXM / (2. * cos((lp.phi + lp.phi) * THIRD) - 1);
    22. 

  22. 	return (lp);
    23. 

  23. }
    24. 

  24. FREEUP; if (P) pj_dalloc(P); }
    25. 

  25. ENTRY0(crast) P->es = 0.; P->inv = s_inverse; P->fwd = s_forward; ENDENTRY(P)
    26.