1 files changed, 30 insertions, 0 deletions
diff --git a/src/projections/wag7.cpp b/src/projections/wag7.cpp
new file mode 100644
index 00000000..c8807f12
--- /dev/null
+++ b/src/projections/wag7.cpp
@@ -0,0 +1,30 @@
+#define PJ_LIB__
+
+#include <math.h>
+
+#include "projects.h"
+
+PROJ_HEAD(wag7, "Wagner VII") "\n\tMisc Sph, no inv";
+
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0, 0.0};
+	double theta, ct, D;
+
+	(void) P; /* Shut up compiler warnnings about unused P */
+
+	theta = asin (xy.y = 0.90630778703664996 * sin(lp.phi));
+	xy.x  = 2.66723 * (ct = cos (theta)) * sin (lp.lam /= 3.);
+	xy.y *= 1.24104 * (D = 1/(sqrt (0.5 * (1 + ct * cos (lp.lam)))));
+	xy.x *= D;
+	return (xy);
+}
+
+
+PJ *PROJECTION(wag7) {
+    P->fwd = s_forward;
+    P->inv = nullptr;
+    P->es = 0.;
+    return P;
+}