1 files changed, 54 insertions, 0 deletions
diff --git a/src/projections/eqc.cpp b/src/projections/eqc.cpp
new file mode 100644
index 00000000..3fdb6dc0
--- /dev/null
+++ b/src/projections/eqc.cpp
@@ -0,0 +1,54 @@
+#define PJ_LIB__
+
+#include <errno.h>
+#include <math.h>
+
+#include "proj.h"
+#include "projects.h"
+
+namespace { // anonymous namespace
+struct pj_opaque {
+    double rc;
+};
+} // anonymous namespace
+
+PROJ_HEAD(eqc, "Equidistant Cylindrical (Plate Carree)")
+    "\n\tCyl, Sph\n\tlat_ts=[, lat_0=0]";
+
+
+static XY s_forward (LP lp, PJ *P) {           /* Spheroidal, forward */
+    XY xy = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+
+    xy.x = Q->rc * lp.lam;
+    xy.y = lp.phi - P->phi0;
+
+    return xy;
+}
+
+
+static LP s_inverse (XY xy, PJ *P) {           /* Spheroidal, inverse */
+    LP lp = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+
+    lp.lam = xy.x / Q->rc;
+    lp.phi = xy.y + P->phi0;
+
+    return lp;
+}
+
+
+PJ *PROJECTION(eqc) {
+    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 ((Q->rc = cos(pj_param(P->ctx, P->params, "rlat_ts").f)) <= 0.)
+        return pj_default_destructor (P, PJD_ERR_LAT_TS_LARGER_THAN_90);
+    P->inv = s_inverse;
+    P->fwd = s_forward;
+    P->es = 0.;
+
+    return P;
+}