1 files changed, 76 insertions, 0 deletions
diff --git a/src/projections/urmfps.cpp b/src/projections/urmfps.cpp
new file mode 100644
index 00000000..7103222a
--- /dev/null
+++ b/src/projections/urmfps.cpp
@@ -0,0 +1,76 @@
+#define PJ_LIB__
+
+#include <errno.h>
+#include <math.h>
+
+#include "proj.h"
+#include "projects.h"
+
+PROJ_HEAD(urmfps, "Urmaev Flat-Polar Sinusoidal") "\n\tPCyl, Sph\n\tn=";
+PROJ_HEAD(wag1, "Wagner I (Kavraisky VI)") "\n\tPCyl, Sph";
+
+namespace { // anonymous namespace
+struct pj_opaque {
+    double  n, C_y;
+};
+} // anonymous namespace
+
+#define C_x 0.8773826753
+#define Cy 1.139753528477
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0, 0.0};
+    lp.phi = aasin (P->ctx,static_cast<struct pj_opaque*>(P->opaque)->n * sin (lp.phi));
+    xy.x = C_x * lp.lam * cos (lp.phi);
+    xy.y = static_cast<struct pj_opaque*>(P->opaque)->C_y * lp.phi;
+    return xy;
+}
+
+
+static LP s_inverse (XY xy, PJ *P) {           /* Spheroidal, inverse */
+    LP lp = {0.0, 0.0};
+    xy.y /= static_cast<struct pj_opaque*>(P->opaque)->C_y;
+    lp.phi = aasin(P->ctx, sin (xy.y) / static_cast<struct pj_opaque*>(P->opaque)->n);
+    lp.lam = xy.x / (C_x * cos (xy.y));
+    return lp;
+}
+
+
+static PJ *setup(PJ *P) {
+    static_cast<struct pj_opaque*>(P->opaque)->C_y = Cy / static_cast<struct pj_opaque*>(P->opaque)->n;
+    P->es = 0.;
+    P->inv = s_inverse;
+    P->fwd = s_forward;
+    return P;
+}
+
+
+PJ *PROJECTION(urmfps) {
+    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;
+
+    if (pj_param(P->ctx, P->params, "tn").i) {
+        static_cast<struct pj_opaque*>(P->opaque)->n = pj_param(P->ctx, P->params, "dn").f;
+        if (static_cast<struct pj_opaque*>(P->opaque)->n <= 0. || static_cast<struct pj_opaque*>(P->opaque)->n > 1.)
+            return pj_default_destructor(P, PJD_ERR_N_OUT_OF_RANGE);
+    } else {
+        return pj_default_destructor(P, PJD_ERR_N_OUT_OF_RANGE);
+    }
+
+    return setup(P);
+}
+
+
+PJ *PROJECTION(wag1) {
+    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;
+
+    static_cast<struct pj_opaque*>(P->opaque)->n = 0.8660254037844386467637231707;
+    return setup(P);
+}