1 files changed, 41 insertions, 0 deletions
diff --git a/src/projections/cc.cpp b/src/projections/cc.cpp
new file mode 100644
index 00000000..152e6e4a
--- /dev/null
+++ b/src/projections/cc.cpp
@@ -0,0 +1,41 @@
+#define PJ_LIB__
+
+#include <math.h>
+
+#include "proj.h"
+#include "projects.h"
+
+PROJ_HEAD(cc, "Central Cylindrical") "\n\tCyl, Sph";
+#define EPS10 1.e-10
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0,0.0};
+    if (fabs (fabs(lp.phi) - M_HALFPI) <= EPS10) {
+        proj_errno_set(P, PJD_ERR_TOLERANCE_CONDITION);
+        return xy;
+    }
+    xy.x = lp.lam;
+    xy.y = tan(lp.phi);
+    return xy;
+}
+
+
+static LP s_inverse (XY xy, PJ *P) {           /* Spheroidal, inverse */
+    LP lp = {0.0,0.0};
+    (void) P;
+    lp.phi = atan(xy.y);
+    lp.lam = xy.x;
+    return lp;
+}
+
+
+
+PJ *PROJECTION(cc) {
+    P->es = 0.;
+
+    P->inv = s_inverse;
+    P->fwd = s_forward;
+
+    return P;
+}