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

1 files changed, 112 insertions, 0 deletions

diff --git a/src/projections/moll.cpp b/src/projections/moll.cpp
new file mode 100644
index 00000000..c877a1bb
--- /dev/null
+++ b/src/projections/moll.cpp
@@ -0,0 +1,112 @@
+#define PJ_LIB__
+
+#include <errno.h>
+#include <math.h>
+
+#include "projects.h"
+
+PROJ_HEAD(moll, "Mollweide") "\n\tPCyl, Sph";
+PROJ_HEAD(wag4, "Wagner IV") "\n\tPCyl, Sph";
+PROJ_HEAD(wag5, "Wagner V") "\n\tPCyl, Sph";
+
+#define MAX_ITER    10
+#define LOOP_TOL    1e-7
+
+namespace { // anonymous namespace
+struct pj_opaque {
+    double  C_x, C_y, C_p;
+};
+} // anonymous namespace
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    double k, V;
+    int i;
+
+    k = Q->C_p * sin(lp.phi);
+    for (i = MAX_ITER; i ; --i) {
+        lp.phi -= V = (lp.phi + sin(lp.phi) - k) /
+            (1. + cos(lp.phi));
+        if (fabs(V) < LOOP_TOL)
+            break;
+    }
+    if (!i)
+        lp.phi = (lp.phi < 0.) ? -M_HALFPI : M_HALFPI;
+    else
+        lp.phi *= 0.5;
+    xy.x = Q->C_x * lp.lam * cos(lp.phi);
+    xy.y = Q->C_y * sin(lp.phi);
+    return xy;
+}
+
+
+static LP s_inverse (XY xy, PJ *P) {           /* Spheroidal, inverse */
+    LP lp = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    lp.phi = aasin(P->ctx, xy.y / Q->C_y);
+    lp.lam = xy.x / (Q->C_x * cos(lp.phi));
+        if (fabs(lp.lam) < M_PI) {
+            lp.phi += lp.phi;
+            lp.phi = aasin(P->ctx, (lp.phi + sin(lp.phi)) / Q->C_p);
+        } else {
+            lp.lam = lp.phi = HUGE_VAL;
+        }
+    return lp;
+}
+
+
+static PJ * setup(PJ *P, double p) {
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    double r, sp, p2 = p + p;
+
+    P->es = 0;
+    sp = sin(p);
+    r = sqrt(M_TWOPI * sp / (p2 + sin(p2)));
+
+    Q->C_x = 2. * r / M_PI;
+    Q->C_y = r / sp;
+    Q->C_p = p2 + sin(p2);
+
+    P->inv = s_inverse;
+    P->fwd = s_forward;
+    return P;
+}
+
+
+PJ *PROJECTION(moll) {
+    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;
+
+    return setup(P, M_HALFPI);
+}
+
+
+PJ *PROJECTION(wag4) {
+    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;
+
+    return setup(P, M_PI/3.);
+}
+
+PJ *PROJECTION(wag5) {
+    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;
+
+    P->es = 0;
+    Q->C_x = 0.90977;
+    Q->C_y = 1.65014;
+    Q->C_p = 3.00896;
+
+    P->inv = s_inverse;
+    P->fwd = s_forward;
+
+    return P;
+}