New

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

1 files changed, 106 insertions, 0 deletions

diff --git a/src/PJ_lcc.c b/src/PJ_lcc.c
new file mode 100644
index 00000000..9e697cd9
--- /dev/null
+++ b/src/PJ_lcc.c
@@ -0,0 +1,106 @@
+#ifndef lint
+static const char SCCSID[]="@(#)PJ_lcc.c	4.2	94/03/18	GIE	REL";
+#endif
+#define PROJ_PARMS__ \
+	double	phi1; \
+	double	phi2; \
+	double	n; \
+	double	rho; \
+	double	rho0; \
+	double	c; \
+	int		ellips;
+#define PJ_LIB__
+#include	<projects.h>
+PROJ_HEAD(lcc, "Lambert Conformal Conic")
+	"\n\tConic, Sph&Ell\n\tlat_1= and lat_2= or lat_0";
+# define EPS10	1.e-10
+FORWARD(e_forward); /* ellipsoid & spheroid */
+	if (fabs(fabs(lp.phi) - HALFPI) < EPS10) {
+		if ((lp.phi * P->n) <= 0.) F_ERROR;
+		P->rho = 0.;
+		}
+	else
+		P->rho = P->c * (P->ellips ? pow(pj_tsfn(lp.phi, sin(lp.phi),
+			P->e), P->n) : pow(tan(FORTPI + .5 * lp.phi), -P->n));
+	xy.x = P->k0 * (P->rho * sin( lp.lam *= P->n ) );
+	xy.y = P->k0 * (P->rho0 - P->rho * cos(lp.lam) );
+	return (xy);
+}
+INVERSE(e_inverse); /* ellipsoid & spheroid */
+	xy.x /= P->k0;
+	xy.y /= P->k0;
+	if (P->rho = hypot(xy.x, xy.y = P->rho0 - xy.y)) {
+		if (P->n < 0.) {
+			P->rho = -P->rho;
+			xy.x = -xy.x;
+			xy.y = -xy.y;
+		}
+		if (P->ellips) {
+			if ((lp.phi = pj_phi2(pow(P->rho / P->c, 1./P->n), P->e))
+				== HUGE_VAL)
+				I_ERROR;
+		} else
+			lp.phi = 2. * atan(pow(P->c / P->rho, 1./P->n)) - HALFPI;
+		lp.lam = atan2(xy.x, xy.y) / P->n;
+	} else {
+		lp.lam = 0.;
+		lp.phi = P->n > 0. ? HALFPI : - HALFPI;
+	}
+	return (lp);
+}
+SPECIAL(fac) {
+	if (fabs(fabs(lp.phi) - HALFPI) < EPS10) {
+		if ((lp.phi * P->n) <= 0.) return;
+		P->rho = 0.;
+	} else
+		P->rho = P->c * (P->ellips ? pow(pj_tsfn(lp.phi, sin(lp.phi),
+			P->e), P->n) : pow(tan(FORTPI + .5 * lp.phi), -P->n));
+	fac->code |= IS_ANAL_HK + IS_ANAL_CONV;
+	fac->k = fac->h = P->k0 * P->n * P->rho /
+		pj_msfn(sin(lp.phi), cos(lp.phi), P->es);
+	fac->conv = - P->n * lp.lam;
+}
+FREEUP; if (P) pj_dalloc(P); }
+ENTRY0(lcc)
+	double cosphi, sinphi;
+	int secant;
+
+	P->phi1 = pj_param(P->params, "rlat_1").f;
+	if (pj_param(P->params, "tlat_2").i)
+		P->phi2 = pj_param(P->params, "rlat_2").f;
+	else {
+		P->phi2 = P->phi1;
+		if (!pj_param(P->params, "tlat_0").i)
+			P->phi0 = P->phi1;
+	}
+	if (fabs(P->phi1 + P->phi2) < EPS10) E_ERROR(-21);
+	P->n = sinphi = sin(P->phi1);
+	cosphi = cos(P->phi1);
+	secant = fabs(P->phi1 - P->phi2) >= EPS10;
+	if (P->ellips = (P->es != 0.)) {
+		double ml1, m1;
+
+		P->e = sqrt(P->es);
+		m1 = pj_msfn(sinphi, cosphi, P->es);
+		ml1 = pj_tsfn(P->phi1, sinphi, P->e);
+		if (secant) { /* secant cone */
+			P->n = log(m1 /
+			   pj_msfn(sinphi = sin(P->phi2), cos(P->phi2), P->es));
+			P->n /= log(ml1 / pj_tsfn(P->phi2, sinphi, P->e));
+		}
+		P->c = (P->rho0 = m1 * pow(ml1, -P->n) / P->n);
+		P->rho0 *= (fabs(fabs(P->phi0) - HALFPI) < EPS10) ? 0. :
+			pow(pj_tsfn(P->phi0, sin(P->phi0), P->e), P->n);
+	} else {
+		if (secant)
+			P->n = log(cosphi / cos(P->phi2)) /
+			   log(tan(FORTPI + .5 * P->phi2) /
+			   tan(FORTPI + .5 * P->phi1));
+		P->c = cosphi * pow(tan(FORTPI + .5 * P->phi1), P->n) / P->n;
+		P->rho0 = (fabs(fabs(P->phi0) - HALFPI) < EPS10) ? 0. :
+			P->c * pow(tan(FORTPI + .5 * P->phi0), -P->n);
+	}
+	P->inv = e_inverse;
+	P->fwd = e_forward;
+	P->spc = fac;
+ENDENTRY(P)