/Proj4/PJ_august.c

http://github.com/route-me/route-me · C · 21 lines · 20 code · 1 blank · 0 comment · 1 complexity · 74c7e8786a2d58ca485162826f337020 MD5 · raw file 

    

  1. #ifndef lint
    2. 

  2. static const char SCCSID[]="@(#)PJ_august.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(august, "August Epicycloidal") "\n\tMisc Sph, no inv.";
    7. 

  7. #define M 1.333333333333333
    8. 

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

  9. 	double t, c1, c, x1, x12, y1, y12;
    10. 

  10. 

  11. 	t = tan(.5 * lp.phi);
    12. 

  12. 	c1 = sqrt(1. - t * t);
    13. 

  13. 	c = 1. + c1 * cos(lp.lam *= .5);
    14. 

  14. 	x1 = sin(lp.lam) *  c1 / c;
    15. 

  15. 	y1 =  t / c;
    16. 

  16. 	xy.x = M * x1 * (3. + (x12 = x1 * x1) - 3. * (y12 = y1 *  y1));
    17. 

  17. 	xy.y = M * y1 * (3. + 3. * x12 - y12);
    18. 

  18. 	return (xy);
    19. 

  19. }
    20. 

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

  21. ENTRY0(august) P->inv = 0; P->fwd = s_forward; P->es = 0.; ENDENTRY(P)
    22.