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
|
