New

git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@776 4e78687f-474d-0410-85f9-8d5e500ac6b2

1 files changed, 71 insertions, 0 deletions

diff --git a/src/PJ_ocea.c b/src/PJ_ocea.c
new file mode 100644
index 00000000..95fcda0d
--- /dev/null
+++ b/src/PJ_ocea.c
@@ -0,0 +1,71 @@
+#ifndef lint
+static const char SCCSID[]="@(#)PJ_ocea.c	4.1	94/02/15	GIE	REL";
+#endif
+#define PROJ_PARMS__ \
+	double	rok; \
+	double	rtk; \
+	double	sinphi; \
+	double	cosphi; \
+	double	singam; \
+	double	cosgam;
+#define PJ_LIB__
+#include	<projects.h>
+PROJ_HEAD(ocea, "Oblique Cylindrical Equal Area") "\n\tCyl, Sph"
+	"lonc= alpha= or\n\tlat_1= lat_2= lon_1= lon_2=";
+FORWARD(s_forward); /* spheroid */
+	double t;
+
+	xy.y = sin(lp.lam);
+/*
+	xy.x = atan2((tan(lp.phi) * P->cosphi + P->sinphi * xy.y) , cos(lp.lam));
+*/
+	t = cos(lp.lam);
+	xy.x = atan((tan(lp.phi) * P->cosphi + P->sinphi * xy.y) / t);
+	if (t < 0.)
+		xy.x += PI;
+	xy.x *= P->rtk;
+	xy.y = P->rok * (P->sinphi * sin(lp.phi) - P->cosphi * cos(lp.phi) * xy.y);
+	return (xy);
+}
+INVERSE(s_inverse); /* spheroid */
+	double t, s;
+
+	xy.y /= P->rok;
+	xy.x /= P->rtk;
+	t = sqrt(1. - xy.y * xy.y);
+	lp.phi = asin(xy.y * P->sinphi + t * P->cosphi * (s = sin(xy.x)));
+	lp.lam = atan2(t * P->sinphi * s - xy.y * P->cosphi,
+		t * cos(xy.x));
+	return (lp);
+}
+FREEUP; if (P) pj_dalloc(P); }
+ENTRY0(ocea)
+	double phi_0, phi_1, phi_2, lam_1, lam_2, lonz, alpha;
+
+	P->rok = P->a / P->k0;
+	P->rtk = P->a * P->k0;
+	if ( pj_param(P->params, "talpha").i) {
+		alpha	= pj_param(P->params, "ralpha").f;
+		lonz = pj_param(P->params, "rlonc").f;
+		P->singam = atan(-cos(alpha)/(-sin(phi_0) * sin(alpha))) + lonz;
+		P->sinphi = asin(cos(phi_0) * sin(alpha));
+	} else {
+		phi_1 = pj_param(P->params, "rlat_1").f;
+		phi_2 = pj_param(P->params, "rlat_2").f;
+		lam_1 = pj_param(P->params, "rlon_1").f;
+		lam_2 = pj_param(P->params, "rlon_2").f;
+		P->singam = atan2(cos(phi_1) * sin(phi_2) * cos(lam_1) -
+			sin(phi_1) * cos(phi_2) * cos(lam_2),
+			sin(phi_1) * cos(phi_2) * sin(lam_2) -
+			cos(phi_1) * sin(phi_2) * sin(lam_1) );
+		P->sinphi = atan(-cos(P->singam - lam_1) / tan(phi_1));
+	}
+	P->lam0 = P->singam + HALFPI;
+	P->cosphi = cos(P->sinphi);
+	P->sinphi = sin(P->sinphi);
+	P->cosgam = cos(P->singam);
+	P->singam = sin(P->singam);
+	P->inv = s_inverse;
+	P->fwd = s_forward;
+	P->es = 0.;
+ENDENTRY(P)