1 files changed, 73 insertions, 0 deletions
diff --git a/projection.c b/projection.c
new file mode 100644
index 00000000..a89ca381
--- /dev/null
+++ b/projection.c
@@ -0,0 +1,73 @@
+/**
+ * Navit, a modular navigation system.
+ * Copyright (C) 2005-2008 Navit Team
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include <string.h>
+#include <glib.h>
+#include "coord.h"
+#include "debug.h"
+#include "projection.h"
+
+struct projection_name {
+        enum projection projection;
+        char *name;
+};
+
+
+struct projection_name projection_names[]={
+	{projection_none, ""},
+	{projection_mg, "mg"},
+	{projection_garmin, "garmin"},
+	{projection_utm, "utm"},
+	{projection_gk, "gk"},
+};
+
+
+enum projection
+projection_from_name(const char *name, struct coord *offset)
+{
+	int i;
+	int zone;
+	char ns;
+
+	for (i=0 ; i < sizeof(projection_names)/sizeof(struct projection_name) ; i++) {
+		if (! strcmp(projection_names[i].name, name))
+			return projection_names[i].projection;
+	}
+	if (offset) {
+		if (sscanf(name,"utm%d%c",&zone,&ns) == 2 && zone > 0 && zone <= 60 && (ns == 'n' || ns == 's')) {
+                	offset->x=zone*1000000;
+			offset->y=(ns == 's' ? -10000000:0);
+			return projection_utm;
+		}
+	}
+	return projection_none;
+}
+
+char *
+projection_to_name(enum projection proj, struct coord *offset)
+{
+	int i;
+
+	for (i=0 ; i < sizeof(projection_names)/sizeof(struct projection_name) ; i++) {
+		if (projection_names[i].projection == proj)
+			return projection_names[i].name;
+	}
+	return NULL; 
+}
+