1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101
|
#define PJ_LIB__
# include <projects.h>
PROJ_HEAD(wag3, "Wagner III") "\n\tPCyl., Sph.\n\tlat_ts=";
#define TWOTHIRD 0.6666666666666666666667
struct pj_opaque {
double C_x;
};
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
xy.x = P->opaque->C_x * lp.lam * cos(TWOTHIRD * lp.phi);
xy.y = lp.phi;
return xy;
}
#if 0
INVERSE(s_inverse); /* spheroid */
#endif
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
lp.phi = xy.y;
lp.lam = xy.x / (P->opaque->C_x * cos(TWOTHIRD * lp.phi));
return lp;
}
static void *freeup_new (PJ *P) { /* Destructor */
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(wag3) {
double ts;
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return freeup_new (P);
P->opaque = Q;
ts = pj_param (P->ctx, P->params, "rlat_ts").f;
P->opaque->C_x = cos (ts) / cos (2.*ts/3.);
P->es = 0.;
P->inv = s_inverse;
P->fwd = s_forward;
return P;
}
#ifndef PJ_SELFTEST
int pj_wag3_selftest (void) {return 0;}
#else
int pj_wag3_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=wag3 +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{223387.02171816575, 111701.07212763709},
{223387.02171816575, -111701.07212763709},
{-223387.02171816575, 111701.07212763709},
{-223387.02171816575, -111701.07212763709},
};
XY inv_in[] = {
{ 200, 100},
{ 200,-100},
{-200, 100},
{-200,-100}
};
LP s_inv_expect[] = {
{0.001790493109880963, 0.00089524655489191132},
{0.001790493109880963, -0.00089524655489191132},
{-0.001790493109880963, 0.00089524655489191132},
{-0.001790493109880963, -0.00089524655489191132},
};
return pj_generic_selftest (0, s_args, tolerance_xy, tolerance_lp, 4, 4, fwd_in, 0, s_fwd_expect, inv_in, 0, s_inv_expect);
}
#endif
|