1 files changed, 124 insertions, 0 deletions
diff --git a/src/projections/latlong.cpp b/src/projections/latlong.cpp
new file mode 100644
index 00000000..1331d59a
--- /dev/null
+++ b/src/projections/latlong.cpp
@@ -0,0 +1,124 @@
+/******************************************************************************
+ * Project:  PROJ.4
+ * Purpose:  Stub projection implementation for lat/long coordinates. We
+ *           don't actually change the coordinates, but we want proj=latlong
+ *           to act sort of like a projection.
+ * Author:   Frank Warmerdam, warmerdam@pobox.com
+ *
+ ******************************************************************************
+ * Copyright (c) 2000, Frank Warmerdam
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *****************************************************************************/
+
+/* very loosely based upon DMA code by Bradford W. Drew */
+#define PJ_LIB__
+#include "proj_internal.h"
+#include "projects.h"
+
+PROJ_HEAD(lonlat, "Lat/long (Geodetic)")  "\n\t";
+PROJ_HEAD(latlon, "Lat/long (Geodetic alias)")  "\n\t";
+PROJ_HEAD(latlong, "Lat/long (Geodetic alias)")  "\n\t";
+PROJ_HEAD(longlat, "Lat/long (Geodetic alias)")  "\n\t";
+
+
+ static XY latlong_forward(LP lp, PJ *P) {
+    XY xy = {0.0,0.0};
+    (void) P;
+    xy.x = lp.lam;
+    xy.y = lp.phi;
+    return xy;
+}
+
+
+static LP latlong_inverse(XY xy, PJ *P) {
+    LP lp = {0.0,0.0};
+    (void) P;
+    lp.phi = xy.y;
+    lp.lam = xy.x;
+    return lp;
+}
+
+
+ static XYZ latlong_forward_3d (LPZ lpz, PJ *P) {
+    XYZ xyz = {0,0,0};
+    (void) P;
+    xyz.x = lpz.lam;
+    xyz.y = lpz.phi;
+    xyz.z = lpz.z;
+    return xyz;
+}
+
+
+static LPZ latlong_inverse_3d (XYZ xyz, PJ *P) {
+    LPZ lpz = {0,0,0};
+    (void) P;
+    lpz.lam = xyz.x;
+    lpz.phi = xyz.y;
+    lpz.z   = xyz.z;
+    return lpz;
+}
+
+static PJ_COORD latlong_forward_4d (PJ_COORD obs, PJ *P) {
+    (void) P;
+    return obs;
+}
+
+
+static PJ_COORD latlong_inverse_4d (PJ_COORD obs, PJ *P) {
+    (void) P;
+    return obs;
+}
+
+
+
+static PJ *latlong_setup (PJ *P) {
+    P->is_latlong = 1;
+    P->x0 = 0;
+    P->y0 = 0;
+    P->inv = latlong_inverse;
+    P->fwd = latlong_forward;
+    P->inv3d = latlong_inverse_3d;
+    P->fwd3d = latlong_forward_3d;
+    P->inv4d = latlong_inverse_4d;
+    P->fwd4d = latlong_forward_4d;
+    P->left = PJ_IO_UNITS_ANGULAR;
+    P->right = PJ_IO_UNITS_ANGULAR;
+    return P;
+}
+
+PJ *PROJECTION(latlong) {
+    return latlong_setup (P);
+}
+
+
+PJ *PROJECTION(longlat) {
+    return latlong_setup (P);
+}
+
+
+PJ *PROJECTION(latlon) {
+    return latlong_setup (P);
+}
+
+
+PJ *PROJECTION(lonlat) {
+    return latlong_setup (P);
+}
+