1 files changed, 37 insertions, 0 deletions
diff --git a/src/projections/PJ_mill.cpp b/src/projections/PJ_mill.cpp
new file mode 100644
index 00000000..3ea9636f
--- /dev/null
+++ b/src/projections/PJ_mill.cpp
@@ -0,0 +1,37 @@
+#define PJ_LIB__
+
+#include <math.h>
+
+#include "projects.h"
+
+PROJ_HEAD(mill, "Miller Cylindrical") "\n\tCyl, Sph";
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0,0.0};
+    (void) P;
+
+    xy.x = lp.lam;
+    xy.y = log(tan(M_FORTPI + lp.phi * .4)) * 1.25;
+
+    return (xy);
+}
+
+
+static LP s_inverse (XY xy, PJ *P) {           /* Spheroidal, inverse */
+    LP lp = {0.0,0.0};
+    (void) P;
+
+    lp.lam = xy.x;
+    lp.phi = 2.5 * (atan(exp(.8 * xy.y)) - M_FORTPI);
+
+    return (lp);
+}
+
+
+PJ *PROJECTION(mill) {
+    P->es = 0.;
+    P->inv = s_inverse;
+    P->fwd = s_forward;
+
+    return P;
+}