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#ifndef lint
static const char SCCSID[]="@(#)PJ_aitoff.c 4.1 94/02/15 GIE REL";
#endif
#define PROJ_PARMS__ \
double cosphi1; \
int mode;
#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(aitoff, "Aitoff") "\n\tMisc Sph";
PROJ_HEAD(wintri, "Winkel Tripel") "\n\tMisc Sph\n\tlat_1";
FORWARD(s_forward); /* spheroid */
double c, d;
if((d = acos(cos(lp.phi) * cos(c = 0.5 * lp.lam)))) {/* basic Aitoff */
xy.x = 2. * d * cos(lp.phi) * sin(c) * (xy.y = 1. / sin(d));
xy.y *= d * sin(lp.phi);
} else
xy.x = xy.y = 0.;
if (P->mode) { /* Winkel Tripel */
xy.x = (xy.x + lp.lam * P->cosphi1) * 0.5;
xy.y = (xy.y + lp.phi) * 0.5;
}
return (xy);
}
FREEUP; if (P) pj_dalloc(P); }
static PJ *
setup(PJ *P) {
P->inv = 0;
P->fwd = s_forward;
P->es = 0.;
return P;
}
ENTRY0(aitoff)
P->mode = 0;
ENDENTRY(setup(P))
ENTRY0(wintri)
P->mode = 1;
if (pj_param(P->params, "tlat_1").i)
{
if ((P->cosphi1 = cos(pj_param(P->params, "rlat_1").f)) == 0.)
E_ERROR(-22)
}
else /* 50d28' or acos(2/pi) */
P->cosphi1 = 0.636619772367581343;
ENDENTRY(setup(P))
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