cpp conversion: remove useless pj_, PJ_ and proj_ filename prefixes

1 files changed, 282 insertions, 0 deletions

diff --git a/src/projections/mod_ster.cpp b/src/projections/mod_ster.cpp
new file mode 100644
index 00000000..7c4f363b
--- /dev/null
+++ b/src/projections/mod_ster.cpp
@@ -0,0 +1,282 @@
+/* based upon Snyder and Linck, USGS-NMD */
+#define PJ_LIB__
+#include <errno.h>
+#include "projects.h"
+#include "proj_math.h"
+
+PROJ_HEAD(mil_os, "Miller Oblated Stereographic") "\n\tAzi(mod)";
+PROJ_HEAD(lee_os, "Lee Oblated Stereographic") "\n\tAzi(mod)";
+PROJ_HEAD(gs48, "Mod. Stereographic of 48 U.S.") "\n\tAzi(mod)";
+PROJ_HEAD(alsk, "Mod. Stereographic of Alaska") "\n\tAzi(mod)";
+PROJ_HEAD(gs50, "Mod. Stereographic of 50 U.S.") "\n\tAzi(mod)";
+
+#define EPSLN 1e-12
+
+namespace { // anonymous namespace
+struct pj_opaque {
+    const COMPLEX *zcoeff; \
+    double  cchio, schio; \
+    int     n;
+};
+} // anonymous namespace
+
+
+static XY e_forward (LP lp, PJ *P) {          /* Ellipsoidal, forward */
+    XY xy = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    double sinlon, coslon, esphi, chi, schi, cchi, s;
+    COMPLEX p;
+
+    sinlon = sin(lp.lam);
+    coslon = cos(lp.lam);
+    esphi = P->e * sin(lp.phi);
+    chi = 2. * atan(tan((M_HALFPI + lp.phi) * .5) *
+        pow((1. - esphi) / (1. + esphi), P->e * .5)) - M_HALFPI;
+    schi = sin(chi);
+    cchi = cos(chi);
+    s = 2. / (1. + Q->schio * schi + Q->cchio * cchi * coslon);
+    p.r = s * cchi * sinlon;
+    p.i = s * (Q->cchio * schi - Q->schio * cchi * coslon);
+    p = pj_zpoly1(p, Q->zcoeff, Q->n);
+    xy.x = p.r;
+    xy.y = p.i;
+
+    return xy;
+}
+
+
+static LP e_inverse (XY xy, PJ *P) {          /* Ellipsoidal, inverse */
+    LP lp = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    int nn;
+    COMPLEX p, fxy, fpxy, dp;
+    double den, rh = 0.0, z, sinz = 0.0, cosz = 0.0, chi, phi = 0.0, esphi;
+
+    p.r = xy.x;
+    p.i = xy.y;
+    for (nn = 20; nn ;--nn) {
+        fxy = pj_zpolyd1(p, Q->zcoeff, Q->n, &fpxy);
+        fxy.r -= xy.x;
+        fxy.i -= xy.y;
+        den = fpxy.r * fpxy.r + fpxy.i * fpxy.i;
+        dp.r = -(fxy.r * fpxy.r + fxy.i * fpxy.i) / den;
+        dp.i = -(fxy.i * fpxy.r - fxy.r * fpxy.i) / den;
+        p.r += dp.r;
+        p.i += dp.i;
+        if ((fabs(dp.r) + fabs(dp.i)) <= EPSLN)
+            break;
+    }
+    if (nn) {
+        rh = hypot(p.r, p.i);
+        z = 2. * atan(.5 * rh);
+        sinz = sin(z);
+        cosz = cos(z);
+        lp.lam = P->lam0;
+        if (fabs(rh) <= EPSLN) {
+            /* if we end up here input coordinates were (0,0).
+             * pj_inv() adds P->lam0 to lp.lam, this way we are
+             * sure to get the correct offset */
+            lp.lam = 0.0;
+            lp.phi = P->phi0;
+            return lp;
+        }
+        chi = aasin(P->ctx, cosz * Q->schio + p.i * sinz * Q->cchio / rh);
+        phi = chi;
+        for (nn = 20; nn ;--nn) {
+            double dphi;
+            esphi = P->e * sin(phi);
+            dphi = 2. * atan(tan((M_HALFPI + chi) * .5) *
+                pow((1. + esphi) / (1. - esphi), P->e * .5)) - M_HALFPI - phi;
+            phi += dphi;
+            if (fabs(dphi) <= EPSLN)
+                break;
+        }
+    }
+    if (nn) {
+        lp.phi = phi;
+        lp.lam = atan2(p.r * sinz, rh * Q->cchio * cosz - p.i *
+            Q->schio * sinz);
+    } else
+        lp.lam = lp.phi = HUGE_VAL;
+    return lp;
+}
+
+
+static PJ *setup(PJ *P) { /* general initialization */
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    double esphi, chio;
+
+    if (P->es != 0.0) {
+        esphi = P->e * sin(P->phi0);
+        chio = 2. * atan(tan((M_HALFPI + P->phi0) * .5) *
+            pow((1. - esphi) / (1. + esphi), P->e * .5)) - M_HALFPI;
+    } else
+        chio = P->phi0;
+    Q->schio = sin(chio);
+    Q->cchio = cos(chio);
+    P->inv = e_inverse;
+    P->fwd = e_forward;
+
+    return P;
+}
+
+
+/* Miller Oblated Stereographic */
+PJ *PROJECTION(mil_os) {
+    static const COMPLEX AB[] = {
+        {0.924500, 0.},
+        {0.,       0.},
+        {0.019430, 0.}
+    };
+
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
+    if (nullptr==Q)
+        return pj_default_destructor (P, ENOMEM);
+    P->opaque = Q;
+
+    Q->n = 2;
+    P->lam0 = DEG_TO_RAD * 20.;
+    P->phi0 = DEG_TO_RAD * 18.;
+    Q->zcoeff = AB;
+    P->es = 0.;
+
+    return setup(P);
+}
+
+
+/* Lee Oblated Stereographic */
+PJ *PROJECTION(lee_os) {
+    static const COMPLEX AB[] = {
+        {0.721316,    0.},
+        {0.,          0.},
+        {-0.0088162, -0.00617325}
+    };
+
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
+    if (nullptr==Q)
+        return pj_default_destructor (P, ENOMEM);
+    P->opaque = Q;
+
+    Q->n = 2;
+    P->lam0 = DEG_TO_RAD * -165.;
+    P->phi0 = DEG_TO_RAD * -10.;
+    Q->zcoeff = AB;
+    P->es = 0.;
+
+   return setup(P);
+}
+
+
+PJ *PROJECTION(gs48) {
+    static const COMPLEX /* 48 United States */
+    AB[] = {
+        {0.98879,   0.},
+        {0.,        0.},
+        {-0.050909, 0.},
+        {0.,        0.},
+        {0.075528,  0.}
+    };
+
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
+    if (nullptr==Q)
+        return pj_default_destructor (P, ENOMEM);
+    P->opaque = Q;
+
+    Q->n = 4;
+    P->lam0 = DEG_TO_RAD * -96.;
+    P->phi0 = DEG_TO_RAD * 39.;
+    Q->zcoeff = AB;
+    P->es = 0.;
+    P->a = 6370997.;
+
+    return setup(P);
+}
+
+
+PJ *PROJECTION(alsk) {
+    static const COMPLEX  ABe[] = { /* Alaska ellipsoid */
+        { .9945303, 0.},
+        { .0052083, -.0027404},
+        { .0072721,  .0048181},
+        {-.0151089, -.1932526},
+        { .0642675, -.1381226},
+        { .3582802, -.2884586},
+    };
+
+    static const COMPLEX ABs[] = { /* Alaska sphere */
+        { .9972523, 0.},
+        { .0052513, -.0041175},
+        { .0074606,  .0048125},
+        {-.0153783, -.1968253},
+        { .0636871, -.1408027},
+        { .3660976, -.2937382}
+    };
+
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
+    if (nullptr==Q)
+        return pj_default_destructor (P, ENOMEM);
+    P->opaque = Q;
+
+    Q->n = 5;
+    P->lam0 = DEG_TO_RAD * -152.;
+    P->phi0 = DEG_TO_RAD * 64.;
+    if (P->es != 0.0) { /* fixed ellipsoid/sphere */
+        Q->zcoeff = ABe;
+        P->a = 6378206.4;
+        P->e = sqrt(P->es = 0.00676866);
+    } else {
+        Q->zcoeff = ABs;
+        P->a = 6370997.;
+    }
+
+    return setup(P);
+}
+
+
+PJ *PROJECTION(gs50) {
+    static const COMPLEX  ABe[] = { /* GS50 ellipsoid */
+        { .9827497, 0.},
+        { .0210669,  .0053804},
+        {-.1031415, -.0571664},
+        {-.0323337, -.0322847},
+        { .0502303,  .1211983},
+        { .0251805,  .0895678},
+        {-.0012315, -.1416121},
+        { .0072202, -.1317091},
+        {-.0194029,  .0759677},
+        {-.0210072,  .0834037}
+    };
+
+    static const COMPLEX ABs[] = { /* GS50 sphere */
+        { .9842990, 0.},
+        { .0211642,  .0037608},
+        {-.1036018, -.0575102},
+        {-.0329095, -.0320119},
+        { .0499471,  .1223335},
+        { .0260460,  .0899805},
+        { .0007388, -.1435792},
+        { .0075848, -.1334108},
+        {-.0216473,  .0776645},
+        {-.0225161,  .0853673}
+    };
+
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
+    if (nullptr==Q)
+        return pj_default_destructor (P, ENOMEM);
+    P->opaque = Q;
+
+    Q->n = 9;
+    P->lam0 = DEG_TO_RAD * -120.;
+    P->phi0 = DEG_TO_RAD * 45.;
+    if (P->es != 0.0) { /* fixed ellipsoid/sphere */
+        Q->zcoeff = ABe;
+        P->a = 6378206.4;
+        P->e = sqrt(P->es = 0.00676866);
+    } else {
+        Q->zcoeff = ABs;
+        P->a = 6370997.;
+    }
+
+    return setup(P);
+}
+