1 files changed, 100 insertions, 0 deletions
diff --git a/src/3rdparty/proj/PJ_gn_sinu.c b/src/3rdparty/proj/PJ_gn_sinu.c
new file mode 100644
index 00000000..3bf9854f
--- /dev/null
+++ b/src/3rdparty/proj/PJ_gn_sinu.c
@@ -0,0 +1,100 @@
+#define PROJ_PARMS__ \
+	double	*en; \
+	double	m, n, C_x, C_y;
+#define PJ_LIB__
+#include	<projects.h>
+PROJ_HEAD(gn_sinu, "General Sinusoidal Series") "\n\tPCyl, Sph.\n\tm= n=";
+PROJ_HEAD(sinu, "Sinusoidal (Sanson-Flamsteed)") "\n\tPCyl, Sph&Ell";
+PROJ_HEAD(eck6, "Eckert VI") "\n\tPCyl, Sph.";
+PROJ_HEAD(mbtfps, "McBryde-Thomas Flat-Polar Sinusoidal") "\n\tPCyl, Sph.";
+#define EPS10	1e-10
+#define MAX_ITER 8
+#define LOOP_TOL 1e-7
+/* Ellipsoidal Sinusoidal only */
+FORWARD(e_forward); /* ellipsoid */
+	double s, c;
+
+	xy.y = pj_mlfn(lp.phi, s = sin(lp.phi), c = cos(lp.phi), P->en);
+	xy.x = lp.lam * c / sqrt(1. - P->es * s * s);
+	return (xy);
+}
+INVERSE(e_inverse); /* ellipsoid */
+	double s;
+
+	if ((s = fabs(lp.phi = pj_inv_mlfn(xy.y, P->es, P->en))) < HALFPI) {
+		s = sin(lp.phi);
+		lp.lam = xy.x * sqrt(1. - P->es * s * s) / cos(lp.phi);
+	} else if ((s - EPS10) < HALFPI)
+		lp.lam = 0.;
+	else I_ERROR;
+	return (lp);
+}
+/* General spherical sinusoidals */
+FORWARD(s_forward); /* sphere */
+	if (!P->m)
+		lp.phi = P->n != 1. ? aasin(P->n * sin(lp.phi)): lp.phi;
+	else {
+		double k, V;
+		int i;
+
+		k = P->n * sin(lp.phi);
+		for (i = MAX_ITER; i ; --i) {
+			lp.phi -= V = (P->m * lp.phi + sin(lp.phi) - k) /
+				(P->m + cos(lp.phi));
+			if (fabs(V) < LOOP_TOL)
+				break;
+		}
+		if (!i)
+			F_ERROR
+	}
+	xy.x = P->C_x * lp.lam * (P->m + cos(lp.phi));
+	xy.y = P->C_y * lp.phi;
+	return (xy);
+}
+INVERSE(s_inverse); /* sphere */
+	double s;
+
+	xy.y /= P->C_y;
+	lp.phi = P->m ? aasin((P->m * xy.y + sin(xy.y)) / P->n) :
+		( P->n != 1. ? aasin(sin(xy.y) / P->n) : xy.y );
+	lp.lam = xy.x / (P->C_x * (P->m + cos(xy.y)));
+	return (lp);
+}
+FREEUP; if (P) { if (P->en) pj_dalloc(P->en); pj_dalloc(P); } }
+	static void /* for spheres, only */
+setup(PJ *P) {
+	P->es = 0;
+	P->C_x = (P->C_y = sqrt((P->m + 1.) / P->n))/(P->m + 1.);
+	P->inv = s_inverse;
+	P->fwd = s_forward;
+}
+ENTRY1(sinu, en)
+	if (!(P->en = pj_enfn(P->es)))
+		E_ERROR_0;
+	if (P->es) {
+		P->inv = e_inverse;
+		P->fwd = e_forward;
+	} else {
+		P->n = 1.;
+		P->m = 0.;
+		setup(P);
+	}
+ENDENTRY(P)
+ENTRY1(eck6, en)
+	P->m = 1.;
+	P->n = 2.570796326794896619231321691;
+	setup(P);
+ENDENTRY(P)
+ENTRY1(mbtfps, en)
+	P->m = 0.5;
+	P->n = 1.785398163397448309615660845;
+	setup(P);
+ENDENTRY(P)
+ENTRY1(gn_sinu, en)
+	if (pj_param(P->params, "tn").i && pj_param(P->params, "tm").i) {
+		P->n = pj_param(P->params, "dn").f;
+		P->m = pj_param(P->params, "dm").f;
+	} else
+		E_ERROR(-99)
+	setup(P);
+ENDENTRY(P)