1 files changed, 81 insertions, 0 deletions
diff --git a/src/projections/PJ_bacon.cpp b/src/projections/PJ_bacon.cpp
new file mode 100644
index 00000000..6c6350fe
--- /dev/null
+++ b/src/projections/PJ_bacon.cpp
@@ -0,0 +1,81 @@
+# define HLFPI2	2.46740110027233965467      /* (pi/2)^2 */
+# define EPS	1e-10
+#define PJ_LIB__
+#include <errno.h>
+#include <math.h>
+
+#include "projects.h"
+
+
+namespace { // anonymous namespace
+struct pj_opaque {
+	int bacn;
+	int ortl;
+};
+} // anonymous namespace
+
+PROJ_HEAD(apian, "Apian Globular I") "\n\tMisc Sph, no inv";
+PROJ_HEAD(ortel, "Ortelius Oval") "\n\tMisc Sph, no inv";
+PROJ_HEAD(bacon, "Bacon Globular") "\n\tMisc Sph, no inv";
+
+
+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);
+	double ax, f;
+
+	xy.y = Q->bacn ? M_HALFPI * sin(lp.phi) : lp.phi;
+	if ((ax = fabs(lp.lam)) >= EPS) {
+		if (Q->ortl && ax >= M_HALFPI)
+			xy.x = sqrt(HLFPI2 - lp.phi * lp.phi + EPS) + ax - M_HALFPI;
+		else {
+			f = 0.5 * (HLFPI2 / ax + ax);
+			xy.x = ax - f + sqrt(f * f - xy.y * xy.y);
+		}
+		if (lp.lam < 0.) xy.x = - xy.x;
+	} else
+		xy.x = 0.;
+	return (xy);
+}
+
+
+
+PJ *PROJECTION(bacon) {
+    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;
+
+	Q->bacn = 1;
+	Q->ortl = 0;
+	P->es = 0.;
+    P->fwd = s_forward;
+    return P;
+}
+
+
+PJ *PROJECTION(apian) {
+    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;
+
+	Q->bacn = Q->ortl = 0;
+	P->es = 0.;
+    P->fwd = s_forward;
+    return P;
+}
+
+
+PJ *PROJECTION(ortel) {
+    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;
+
+	Q->bacn = 0;
+	Q->ortl = 1;
+	P->es = 0.;
+    P->fwd = s_forward;
+    return P;
+}