1 files changed, 46 insertions, 0 deletions
diff --git a/src/projections/wink1.cpp b/src/projections/wink1.cpp
new file mode 100644
index 00000000..de2f55ee
--- /dev/null
+++ b/src/projections/wink1.cpp
@@ -0,0 +1,46 @@
+#define PJ_LIB__
+
+#include <errno.h>
+#include <math.h>
+
+#include "projects.h"
+
+PROJ_HEAD(wink1, "Winkel I") "\n\tPCyl, Sph\n\tlat_ts=";
+
+namespace { // anonymous namespace
+struct pj_opaque {
+	double	cosphi1;
+};
+} // anonymous namespace
+
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0,0.0};
+	xy.x = .5 * lp.lam * (static_cast<struct pj_opaque*>(P->opaque)->cosphi1 + cos(lp.phi));
+	xy.y = lp.phi;
+	return (xy);
+}
+
+
+static LP s_inverse (XY xy, PJ *P) {           /* Spheroidal, inverse */
+    LP lp = {0.0,0.0};
+	lp.phi = xy.y;
+	lp.lam = 2. * xy.x / (static_cast<struct pj_opaque*>(P->opaque)->cosphi1 + cos(lp.phi));
+	return (lp);
+}
+
+
+PJ *PROJECTION(wink1) {
+    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)->cosphi1 = cos (pj_param(P->ctx, P->params, "rlat_ts").f);
+	P->es = 0.;
+    P->inv = s_inverse;
+    P->fwd = s_forward;
+
+    return P;
+}